• Pacific-EN: Tropical Weat

    From Weather Alert@21:1/175 to All on Tuesday, May 04, 2021 15:39:00
    AXPZ20 KNHC 041931
    TWDEP

    Tropical Weather Discussion
    NWS National Hurricane Center Miami FL
    2205 UTC Tue May 4 2021

    Tropical Weather Discussion for the eastern Pacific Ocean from
    03.4S to 30N, east of 120W including the Gulf of California, and
    from the Equator to 30N, between 120W and 140W. The following
    information is based on satellite imagery, weather observations,
    radar, and meteorological analysis.

    Based on 1800 UTC surface analysis and satellite imagery through
    1900 UTC.

    ...INTERTROPICAL CONVERGENCE ZONE/MONSOON TROUGH...

    The monsoon trough extends from 10N81W to 11N103W to 08N119W.
    The ITCZ continues from 08N119W to 05N131W to beyond 04N140W.
    Scattered moderate to isolated strong convection is from 04N to
    11N between 93W and 102W.

    OFFSHORE WATERS WITHIN 250 NM OF MEXICO...

    W of Baja California, generally moderate NW winds are ongoing
    with seas of 6 to 8 ft. Light breezes and slight seas are
    evident across the Gulf of California. Gentle to moderate W to NW
    breezes prevail off southern Mexico, with 4 to 5 ft seas in
    subsiding SW swell.

    For the forecast, NW winds are diminishing off Baja California,
    but NW swell will persist into Wed morning. Expect moderate NW
    winds along with more NW swell off Baja California by the end of
    week related to a weak cold front or trough moving into the
    region. Looking ahead for southern Mexico, limited fresh to
    strong NE Gulf of Tehuantepec gap wind wind may occur Fri related
    to low pressure farther south into the tropical waters. The low
    pressure may bring increased winds and seas to the waters off
    Oaxaca and Guerrero Fri and this weekend. Elsewhere, gentle to
    moderate winds will persist throughout the Mexican offshore
    waters through Sat.

    OFFSHORE WATERS WITHIN 250 NM OF CENTRAL AMERICA, COLOMBIA, and
    WITHIN 750 NM OF ECUADOR...

    Light to gentle winds prevail across most the region. Seas are
    generally 4 to 6 ft in lingering southerly swell.

    For the forecast, moderate to fresh NE to E winds across the
    Gulf of Papagayo region are expected Thu through Sat night.
    Elsewhere, light to gentle breezes will continue for the next
    several days over the Central American and Equatorial Pacific
    offshore zones. Likewise, no significant long-period swell out of
    the Southern Hemisphere is anticipated through the weekend.

    REMAINDER OF THE AREA...

    A subtropical high pressure system centered north of the area
    continues to supporting mainly moderate trades across the
    forecast waters west of about 125W. Moderate to fresh NW to N
    winds are noted on the east side of the high north of 26N and
    east of 130W. Seas north of 26N and east of 130W range from 5 to
    8 ft, due to northerly swell in the area. Elsewhere gentle to
    moderate winds exist elsewhere with 4 to 6 ft seas in mixed SW
    and NW swell.

    High pressure will remain in control of the weather pattern
    across the forecast region trough into mid week. Large northwest
    swell and fresh to strong northerly winds will continue to
    spread south of 30N and mainly between 120W and 130W into Wed,
    then subside thereafter. Looking ahead, NW swell to 8 ft will
    move into the waters north of 27N and west of 130W late Thu,
    following a weakening cold front entering the waters north of
    25N and west of 130W.

    $$
    KONARIK
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  • From Weather Alert@21:1/175 to All on Wednesday, May 05, 2021 15:38:00
    AXPZ20 KNHC 051919
    TWDEP

    Tropical Weather Discussion
    NWS National Hurricane Center Miami FL
    2205 UTC Wed May 5 2021

    Tropical Weather Discussion for the eastern Pacific Ocean from
    03.4S to 30N, east of 120W including the Gulf of California, and
    from the Equator to 30N, between 120W and 140W. The following
    information is based on satellite imagery, weather observations,
    radar, and meteorological analysis.

    Based on 1800 UTC surface analysis and satellite imagery through
    2200 UTC.

    ...INTERTROPICAL CONVERGENCE ZONE/MONSOON TROUGH...

    The monsoon trough extends from 08N78W to 10N99W to 06N125W. The
    ITCZ continues from 06N125W to beyond 04N140W. Scattered
    moderate to isolated strong convection is from 04N to 11N
    between 90W and 112W.

    OFFSHORE WATERS WITHIN 250 NM OF MEXICO...

    Light to gentle mainly NW winds dominate this basin. Seas are 4
    to 6 ft, except for 2 ft or less in the Gulf of California.
    Smokey conditions may be ongoing over the near shore waters off
    Guerrero and Michoacan.

    For the forecast, gentle to moderate westerly winds will
    generally persist into late week offshore Mexico. Fresh to
    strong gap winds will develop Fri in the Gulf of Tehuantepec as
    low pressure develops farther south, then tracks to the NW well
    off the coast of southern Mexico. This pattern may also result in
    increased winds and seas beyond 120 nm off the coast of Guerrero
    and Michoacan from late Fri through Sun. Farther north, weak
    ridging will support gentle to moderate NW winds and subsiding NW
    swell through late week. Expect moderate NW winds along with
    more NW swell off Baja California by the end of week related to a
    weakening trough moving into the region.

    OFFSHORE WATERS WITHIN 250 NM OF CENTRAL AMERICA, COLOMBIA, and
    WITHIN 750 NM OF ECUADOR...

    Light to gentle winds prevail across most the region. Seas are
    generally 4 to 6 ft in lingering southerly swell.

    For the forecast, moderate to fresh NE to E winds across the
    Gulf of Papagayo region are expected Fri through Sun. Elsewhere,
    light to gentle breezes and moderate swell will continue for the
    next several days over the region.

    REMAINDER OF THE AREA...

    Moderate N winds and 5 to 7 ft seas in lingering NW swell are
    ongoing north of 26N between 120W and 130W. Elsewhere a weak
    subtropical ridge north of 20N is maintaining light to gentle
    breezes north of the ITCZ/monsoon trough, except for moderate
    trade winds west of 130W. Moderate southerly winds are noted
    south of the ITCZ/monsoon trough.

    For the forecast, winds will increase along with additional
    swell across the waters north of 25N starting Fri, accompanying a
    weak cold front that dissipates as it moves eastward across the
    region. Southerly swell east of 105W will subside into late week.

    $$
    KONARIK
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  • From Weather Alert@21:1/175 to All on Wednesday, June 09, 2021 14:45:00
    AXPZ20 KNHC 091608
    TWDEP

    Tropical Weather Discussion
    NWS National Hurricane Center Miami FL
    1605 UTC Wed Jun 9 2021

    Tropical Weather Discussion for the eastern Pacific Ocean from
    03.4S to 30N, east of 120W including the Gulf of California, and
    from the Equator to 30N, between 120W and 140W. The following
    information is based on satellite imagery, weather observations,
    radar, and meteorological analysis.

    Based on 1200 UTC surface analysis and satellite imagery through
    1500 UTC.

    ...TROPICAL WAVES...

    A tropical wave is along 84W-85W extending from coastal Honduras
    and Nicaragua across Costa Rica and into the eastern Pacific.
    Associated moisture and scattered convection is occurring across
    the Caribbean with and behind the wave, and along the eastern
    Pacific monsoon trough.

    A tropical wave is along 104W-105W south of 15N. Scattered to
    numerous moderate to strong convection described below is along
    the monsoon trough, and ahead of the wave between 107W and 110W.

    ...INTERTROPICAL CONVERGENCE ZONE/MONSOON TROUGH...

    The monsoon trough extends from 09N75W to 09N83W to 1011 mb low
    pressure near 11.5N93W to 11N100W to 1011 mb low pressure near
    12.5N113W to 10N123W. The ITCZ reaches from 10N123W to 11N133W.
    Scattered moderate isolated strong convection noted from 02N to
    09N between 78W and 88W. Numerous moderate scattered strong
    convection is noted from 07N to 14N between 88W and 105W.
    Scattered to numerous moderate isolated strong convection is
    noted from 07N to 15N between 105W and 116W. Numerous moderate to
    strong convection is noted from 05N to 08.5N between 135W and
    141.5W.

    OFFSHORE WATERS WITHIN 250 NM OF MEXICO...

    Generally moderate N-NW winds persist over the offshore waters
    of Baja California, except for small areas of 20 kt winds across
    the Baja Norte waters just north of 30N. Seas are 5 to 7 ft in
    lingering NW swell, with a few small areas to 8 ft per overnight
    altimeter data. Light to gentle breezes and slight seas persist
    across the Gulf of California. Forest and agricultural fires from
    Michoacan to Sinaloa may be supporting areas of moderate smoke
    and haze over adjacent offshore waters. Farther south, light to
    gentle breezes and 3 to 4 ft seas persist off southern Mexico.

    Building high pressure west of the area will support moderate to
    fresh NW winds off Baja California and building seas off the
    Baja California coast north of Cabo Lazaro starting tonight and
    then diminishing by Sat. Light to gentle breeze will persist off
    southern Mexico, with moderate SW swell.

    OFFSHORE WATERS WITHIN 250 NM OF CENTRAL
    AMERICA, COLOMBIA, and WITHIN 750 NM OF ECUADOR...

    1011 mb low pressure was analyzed along the monsoon trough well
    off the coast of El Salvador near 11.5N93W. This pattern is
    supporting moderate SE to E winds off El Salvador and Guatemala,
    which are converging with NE winds draining off the coast to
    support a line of showers and thunderstorms about 150 nm off the
    coast from roughly the Gulf of Papagayo to off western
    Guatemala. Light to gentle SW breezes are evident elsewhere off
    Central America. Seas are 4 to 6 ft in SW swell in most areas.

    A broad area of low pressure is expected to form a couple of
    hundred miles south of the coasts of southern Mexico, El
    Salvador, and Guatemala by Thursday. Environmental conditions
    appear favorable for some gradual development, and a tropical
    depression could form by the end of the week or over the weekend
    as the system drifts generally northward. Regardless of
    development, this system could produce heavy rainfall over
    portions of Central America and southern Mexico later this week
    and into the weekend. See products from your local meteorological
    service for more information. Elsewhere, farther south, a new
    round of large, long-period SW swell will reach Ecuadorian waters
    by Fri.

    REMAINDER OF THE AREA...

    Ridging dominates the waters north of 20N west of 115W,
    maintaining gentle to moderate breezes and 5 to 7 ft seas in NW
    swell.

    A broad upper trough extends roughly from 30N130W to 24N144W.
    Divergence aloft on the southeast side of this upper trough is
    supporting a weak surface trough from 06N to 12N between 132W and
    134W, which shows up well in an overnight scatterometer
    satellite pass from around 06 UTC, which also showed fresh NW
    winds within 120 nm west of the trough. A concurrent altimeter
    satellite pass indicated seas starting to approach 8 ft in this
    area. A few showers are noted near this trough as well.

    A small 1011 mb low pressure area persists near 12.5N113W.
    Thunderstorms have been flaring for a few hours on the west side
    of this low. Elsewhere, moderate to fresh trades and 5 to 7 ft
    seas are noted from 05N to 20N west of 110W. Moderate to fresh SW
    winds and 4 to 6 ft seas are evident east of 110W.

    A ridge will build across the northern forecast waters during
    the next few days. The pressure gradient between the ridge and
    lower pressures in the vicinity of the ITCZ will result in
    moderate to locally fresh trade winds roughly N of the ITCZ to
    about 20N and W of 125W through at least Fri, with seas of 5 to 8
    ft. Looking ahead, lowering pressure off Central America will
    support increased SW winds and building seas over the waters
    mainly from 05N to 15N between 95W and 115W by late in the week.

    $$
    Stripling
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  • From Weather Alert@21:1/175 to All on Thursday, June 10, 2021 14:30:00
    AXPZ20 KNHC 101441
    TWDEP

    Tropical Weather Discussion
    NWS National Hurricane Center Miami FL
    1605 UTC Thu Jun 10 2021

    Tropical Weather Discussion for the eastern Pacific Ocean from
    03.4S to 30N, east of 120W including the Gulf of California, and
    from the Equator to 30N, between 120W and 140W. The following
    information is based on satellite imagery, weather observations,
    radar, and meteorological analysis.

    Based on 1200 UTC surface analysis and satellite imagery through
    1440 UTC.

    ...TROPICAL WAVES...

    The axis of tropical wave is near 90/91W north of 03N. Scattered
    moderate convection is observed N of 10N within 210 nm west of
    the wave axis.

    ...INTERTROPICAL CONVERGENCE ZONE/MONSOON TROUGH...

    The monsoon trough extends from 10N85W to 1010 mb low pressure
    centered near 12N115W to 09N125W. The ITCZ continues from
    09N125W to 08N130W to 09N135W. Scattered moderate convection is
    noted from 03N to 10N between 81W and 90W. Scattered moderate
    isolated strong convection is noted from 10N to 18N between 90W
    and 104W. Scattered moderate convection is noted from 06N to 11N
    between 105W and 112W. Scattered moderate isolated strong
    convection is noted from 09N to 13N between 114W and 120W.
    Scattered moderate convection is noted from 06N to 11N between
    138W and 140W.

    OFFSHORE WATERS WITHIN 250 NM OF MEXICO...

    Fresh to strong NW winds prevail off Baja California Norte with
    seas to 5 to 8 ft. Moderate to fresh NW winds are noted off Baja
    California Sur. Light to gentle winds and slight seas persist
    across the Gulf of California. Forest and agricultural fires from
    Jalisco to Sinaloa may be supporting areas of moderate smoke and
    haze over adjacent offshore waters. Farther south, light to
    gentle breezes and 3 to 5 ft seas persist off southern Mexico.
    Divergence aloft on the southeast side of an upper trough is
    supporting numerous showers and thunderstorms in the offshore
    waters of Chiapas, Oaxaca and Guerrero.

    For the forecast, A trough of low pressure is located several
    hundred miles south of the coast of southern Mexico.
    Environmental conditions appear favorable for some gradual
    development, and a tropical depression could form this weekend or
    early next week while the system drifts generally northward.
    Regardless of development, heavy rainfall could occur over
    portions of Central America and southern Mexico late this week
    and into early next week. See products from your local
    meteorological service for more information. Elsewhere, high
    pressure west of the area will support moderate to fresh NW winds
    off Baja California and building seas in NW swell off the Baja
    California coast north of Cabo San Lazaro into Sat.

    OFFSHORE WATERS WITHIN 250 NM OF CENTRAL
    AMERICA, COLOMBIA, and WITHIN 750 NM OF ECUADOR...

    Light NE winds prevail north of 10N, with light to gentle W to
    SW breezes south of 10N. Seas are 4 to 6 ft in SW swell in most
    areas. Clusters of showers and thunderstorms are noted mainly off
    Guatemala and Nicaragua.

    For the forecast, a broad area of low pressure is expected to
    form a couple of hundred miles south of the coasts of southern
    Mexico and Guatemala during the next day or two. Environmental
    conditions appear favorable for some gradual development
    thereafter, and a tropical depression could form this weekend
    while the system drifts generally northward. Regardless of
    development, heavy rainfall could occur over portions of Central
    America and southern Mexico late this week and into the weekend.
    See products from your local meteorological service for more
    information. Elsewhere, light and variable winds will prevail
    north of 10N, with gentle to moderate SW winds south of 10N. A
    new round of long- period SW swell will reach Ecuadorian waters
    by Fri.

    REMAINDER OF THE AREA...

    A 1010 mb area of low pressure persists near 12N115W, embedded
    within the monsoon trough. Scattered moderate to strong
    convection is within 210 nm west and 90 nm east of the low.
    Gentle to moderate winds surround the low. Some gradual development
    is possible over the next few days as the system moves slowly
    westward.

    Elsewhere, fresh to locally strong NE winds are noted from 10N
    to 15N west of 135W, with seas of 8 to 9 ft in this area.
    Moderate to fresh NE winds persist elsewhere north of the ITCZ
    and monsoon trough and west of 120W with 5 to 7 ft seas.
    Gentle to moderate SE winds, and seas of 4-6 ft, are noted south
    of the ITCZ, while gentle to moderate SW winds are noted south of
    the monsoon trough.

    Looking ahead, lowering pressure off Central America will
    support increased W to SW winds and building seas over the
    waters mainly from 05N to 15N between 95W and 115W by late in the
    week.

    $$
    AL
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  • From Weather Alert@21:1/175 to All on Thursday, October 15, 2020 15:50:00
    AXPZ20 KNHC 151602
    TWDEP

    Tropical Weather Discussion
    NWS National Hurricane Center Miami FL
    1605 UTC Thu Oct 15 2020

    Tropical Weather Discussion for the eastern Pacific Ocean from
    the Equator to 32N, east of 140W. The following information is
    based on satellite imagery, weather observations, radar, and
    meteorological analysis.

    Based on 1200 UTC surface analysis and satellite imagery through
    1500 UTC.

    ...SPECIAL FEATURES...

    Gulf of Tehuantepec Gale Warning: Fresh to strong N to NE gap
    winds are blowing in the Tehuantepec region per earlier scatterometer
    data. These winds will briefly diminish this afternoon, then
    return early Fri morning. The current 8 ft peak seas will subside
    some through this afternoon. Winds will increase to gale force
    Fri night through Sat night, then will be fresh to strong
    thereafter. Seas should peak with this gale event near 15 ft
    late Fri night and Sat morning and remain at least 8 ft through
    at least Mon night.

    ...TROPICAL WAVES...

    A tropical wave axis is near 93W from 02N northward to near
    Chiapas Mexico, moving W at 10 to 15 kt. Scattered moderate
    convection is within 120 nm E of the wave axis from 12N-15N.

    A tropical wave axis is near 115W/116W from 01N to 17N, moving W
    at 15 kt. No significant convection is present near the wave.

    A tropical wave axis is near 129W/130W from 02N to 19N, moving W
    at 15 kt. Convection associated with this wave is confined to
    where it intersects the monsoon trough.

    ...INTERTROPICAL CONVERGENCE ZONE/MONSOON TROUGH...

    The monsoon trough axis extends from Costa Rica near 10N86W to
    08N94W to 12N115W to 10N134W. The ITCZ axis extends from 10N134W
    to 11N140W. Scattered moderate to strong convection is offshore
    of Oaxaca Mexico from 11N-15.5N between 95W-99W. Scattered
    moderate convection is noted from 10N to 14W between 123W-134W.

    OFFSHORE WATERS WITHIN 250 NM OF MEXICO...

    Please see the Special Features section for more details on
    the developing Gale Warning in the Gulf of Tehuantepec.

    The remnant low of Norbert is a 1011 mb low near 26N116W.
    Convection has completely disappeared, and maximum sustained
    winds have decreased to less than 20 kt.

    Moderate to fresh NW winds have developed offshore of SW Mexico
    up through the S Gulf of California as indicated by overnight
    scatterometer data with the strongest winds near Cabo Corrientes.
    These winds are spreading northwest to the central Gulf of
    California and offshore of Baja California Sur, and will then
    spread to off Baja California Norte Fri and Fri night while
    diminishing elsewhere. Seas should remain just below 8 ft with
    these winds.

    OFFSHORE WATERS WITHIN 250 NM OF CENTRAL AMERICA, COLOMBIA, and
    WITHIN 750 NM OF ECUADOR...

    Winds will be light to gentle north of the monsoon trough,
    except for moderate to fresh NE to E winds in the Papagayo region
    Fri night and Sat night. Gentle to moderate S to SW winds are
    expected south of the monsoon trough for the next few days
    becoming fresh on Sun night. Mainly moderate 5 to 7 ft long-
    period S swell will prevail across the waters through the
    weekend. Seas will build in southerly swell Sun night through Mon
    night. Scattered showers and thunderstorms will be common in the
    Central American zones due to the proximity of the monsoon
    trough for at least the next couple of days as is described
    above.

    REMAINDER OF THE AREA...

    A moderate pressure gradient due to high pressure well N of the
    discussion waters and low pressure from the ITCZ is producing
    generally moderate to fresh E trades west of 125W. Troughing to
    develop west of Baja California should weaken the trades
    slightly Fri through Sun, with the winds returning by the end of
    the weekend into early next week.

    Lingering mixed swell continues today north of 25N and west of
    120W. A reinforcing set of northerly swell will move across this
    same area tonight into the weekend.

    Moderate monsoonal flow is noted across the remainder of the
    area on both sides of the monsoon trough. Seas of 5 to 8 ft in
    mixed swell dominates the remainder of the waters.

    $$
    Hagen
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  • From Weather Alert@21:1/175 to All on Friday, October 02, 2020 18:06:00
    AXPZ20 KNHC 022043
    TWDEP

    Tropical Weather Discussion
    NWS National Hurricane Center Miami FL
    2205 UTC Fri Oct 2 2020

    Tropical Weather Discussion for the eastern Pacific Ocean from
    the Equator to 32N, east of 140W. The following information is
    based on satellite imagery, weather observations, radar, and
    meteorological analysis.

    Based on 1800 UTC surface analysis and satellite imagery through
    2030 UTC.

    ...SPECIAL FEATURES...

    Category Four Hurricane Marie is centered near 16.9N 125.0W at 02/2100
    UTC moving WNW at 10 kt. Estimated minimum central pressure is
    948 mb. Maximum sustained wind speed is 115 kt with gusts to 140
    kt. Additional strengthening is expected this evening, with
    weakening forecast to begin on Saturday. Numerous moderate to
    strong convection is noted within 150 nm of center all quadrants
    except 120 nm southwest quadrant. Please read the latest NHC
    Public Advisory at https://www.nhc.noaa.gov/text/MIATCPEP3.shtml
    and Forecast/ Advisory at
    https://www.nhc.noaa.gov/text/MIATCMEP3.shtml for more details.

    Gulf of Tehuantepec Gale Warning: A ridge across the western
    Gulf of Mexico and eastern slopes of the Sierra Madre Mountains
    in Mexico combined with Tropical Depression Twenty- Five in the
    NW Caribbean will continue to support fresh to strong northerly
    winds over the Bay of Campeche. These winds are funneling through
    the Chivela Pass into the Gulf of Tehuantepec, producing strong
    gale force winds of 35-40 kt in the Tehuantepec region. These gap
    winds are forecast to persist into Sat, with minimal gale
    conditions prevailing through Mon. Seas will peak near 15-18 ft
    during this event. Please read the latest NWS High Seas Forecast
    issued by the National Hurricane Center at website https://www.nhc.noaa.gov/text/MIAHSFEP2.shtml for more details.

    ...INTERTROPICAL CONVERGENCE ZONE/MONSOON TROUGH...

    The monsoon trough extends from 11N86W to 10N106W, then resumes
    W of Major Hurricane Marie near 10N127W to 09N136W. The ITCZ is
    from 09N136W to beyond 10N140W. Scattered moderate convection is
    noted from 06N to 14N between 85W and 103W and from 12N to 19N
    between 109W and 113W.

    OFFSHORE WATERS WITHIN 250 NM OF MEXICO...

    Please see above for more on the ongoing Gulf of Tehuantepec
    Gale Warning. Elsewhere, mainly light to gentle winds will
    dominate the offshore forecast waters of Baja California under a
    weak pressure gradient. By Mon night, a ridge will establish
    again over the area, bringing gentle to moderate NW winds. Seas
    generated by Hurricane Marie will continue to spread across the
    waters W of Baja California into Sat. Gentle southerly winds are
    expected in the Gulf of California into the start of next week.

    OFFSHORE WATERS WITHIN 250 NM OF CENTRAL AMERICA, COLOMBIA, and
    WITHIN 750 NM OF ECUADOR...

    Moderate to locally fresh southwesterly winds are expected S of
    the monsoon trough with mainly light to gentle winds N of it.
    Seas generated by the gale-force gap winds in the Tehuantepec
    region will continue to propagate across the offshore waters of
    Guatemala and El Salvador into the start of next week

    REMAINDER OF THE AREA...

    Please see Special Features section above for more information
    on Category Four Hurricane Marie.

    Outside of Major Hurricane Marie, a weak ridge prevails over the
    NW corner of the forecast area. The pressure gradient between
    this ridge and Hurricane is maintaining gentle to moderate winds
    N of the monsoon trough to about 25N, and gentle to moderate
    winds S of the monsoon trough. The large size of Hurricane Marie
    will generate a large area of seas greater than 8 ft which will
    spread well away from the cyclone center. By Saturday, seas
    greater than 8 ft will cover much of the waters N of 10N and W of
    115W. Long period southern hemispheric swell may move northward
    across the equator at the start of next week.

    A broad area of low pressure is expected to form several hundred
    miles southwest of the coast of southwestern Mexico this weekend.
    Some development of this system is possible early next week while
    it moves west at 5 to 10 kt. The latest Tropical Weather Outlook
    gives this system a low chance of tropical cyclone formation
    through 5 days.

    $$
    KONARIK
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  • From Weather Alert@21:1/175 to All on Saturday, October 03, 2020 09:12:00
    AXPZ20 KNHC 030916
    TWDEP

    Tropical Weather Discussion
    NWS National Hurricane Center Miami FL
    1005 UTC Sat Oct 3 2020

    Tropical Weather Discussion for the eastern Pacific Ocean from
    the Equator to 32N, east of 140W. The following information is
    based on satellite imagery, weather observations, radar, and
    meteorological analysis.

    Based on 0600 UTC surface analysis and satellite imagery through
    0900 UTC.

    ...SPECIAL FEATURES...

    Powerful Hurricane Marie is centered near 17.9N 126.4W at
    03/0900 UTC moving NW at 8 kt, and this motion is expected to
    continue through the weekend. A turn to the west-northwest is
    expected by Monday. Estimated minimum central pressure is 948
    mb. Maximum sustained wind speed is 115 kt with gusts to 140 kt.
    Marie is a category 4 hurricane on the Saffir-Simpson Hurricane
    Wind Scale. The hurricane is forecast to begin weakening later
    today, and this weakening trend should continue into early next
    week. Marie is expected to be a tropical storm by Sun night.
    Please read the latest NHC Public Advisory at https://www.nhc.noaa.gov/text/MIATCPEP3.shtml and Forecast/
    Advisory at https://www.nhc.noaa.gov/text/MIATCMEP3.shtml for
    more details.

    Gulf of Tehuantepec Gale Warning: A ridge across the western
    Gulf of Mexico and eastern slopes of the Sierra Madre Mountains
    in Mexico combined with Tropical Storm Gamma in the NW Caribbean
    will continue to support fresh to strong northerly winds over
    the Bay of Campeche. These winds are funneling through the Chivela
    Pass into the Gulf of Tehuantepec, producing gale force winds in
    the Tehuantepec region. A recent scatterometer pass provided
    observations of minimal gale force winds across the area, with
    fresh to strong N-NE winds extending farther S to near 12N97W.
    This gap wind event will persist through Mon night as T.S. Gamma
    moves just N of the Yucatan Peninsula. Expect the strongest winds
    of 35-40 kt during the overnight and early morning hours. Seas
    will peak near 16-17 ft early this morning, then will gradually
    subside to 8-10 ft by Tue night. Please read the latest NWS High
    Seas Forecast issued by the National Hurricane Center at website https://www.nhc.noaa.gov/text/MIAHSFEP2.shtml for more details.

    ...TROPICAL WAVES...

    The tropical wave that spawned T.S. Gamma now extends along 89W
    N of 03N. The wave is helping to induce some convective activity
    over the regional waters of Nicaragua and El Salvador, mainly N
    of 12N between 87W and 91W.

    ...INTERTROPICAL CONVERGENCE ZONE/MONSOON TROUGH...

    The monsoon trough extends from 13N87W to 10N95W to 1009 mb low
    pres near 08N102W to 11N108W, then resumes W of Hurricane Marie
    near 13N125W to 09N136W. The ITCZ is from 09N136W to beyond
    10N140W. Scattered moderate convection isolated strong convection
    is noted from 04N to 08N E of 80W, from 08N to 12N between 85W
    and 89W, from 06N to 10N between 100W and 111W, and from 12N to
    15N between 98W and 103W.

    OFFSHORE WATERS WITHIN 250 NM OF MEXICO...

    Please see above for more on the ongoing Gulf of Tehuantepec
    Gale Warning. Elsewhere, mainly light to gentle winds will
    dominate the offshore forecast waters of Baja California under a
    weak pressure gradient. By Mon night, a ridge will establish
    again over the area, bringing gentle to moderate NW winds. Seas
    generated by Hurricane Marie will continue to spread across the
    waters W of Baja California through early Sun. Light to gentle
    southerly winds are expected in the Gulf of California into the
    start of next week.

    OFFSHORE WATERS WITHIN 250 NM OF CENTRAL AMERICA, COLOMBIA, and
    WITHIN 750 NM OF ECUADOR...

    Moderate to locally fresh southwesterly winds are expected S of
    the monsoon trough with mainly light to gentle winds N of it.
    Seas generated by the gale-force gap winds in the Tehuantepec
    region will continue to propagate across the offshore waters of
    Guatemala and El Salvador into the beginning of next week.

    REMAINDER OF THE AREA...

    Please see Special Features section above for more information
    on Category Four Hurricane Marie.

    Outside of Major Hurricane Marie, a weak ridge prevails over the
    NW corner of the forecast area. The pressure gradient between
    this ridge and Marie is maintaining gentle to moderate winds N
    of the monsoon trough to about 28N, and gentle to moderate winds
    S of the monsoon trough. The large size of Hurricane Marie will
    generate a large area of seas greater than 8 ft which will spread
    well away from the cyclone center. By this afternoon, seas greater
    than 8 ft will cover much of the waters N of 10N and W of 115W.
    Long period SE swell from the Southern Hemisphere is forecast to
    reach the equator by Mon.

    An area of low pressure is expected to form within the next couple
    of days several hundred miles southwest of the coast of southwestern
    Mexico. Some development of this system is possible through the
    middle of next week while it moves slowly northwestward.

    Another area of low pressure could form south or southeast of the
    Gulf of Tehuantepec early next week. Gradual development of this
    system will be possible thereafter while it drifts near or south of
    southern coasts of Mexico and Guatemala. Currently, marine guidance
    suggests increasing winds across the offshore waters of Guatemala
    and El Salvador early next week. The latest Tropical Weather
    Outlook states that these systems have a low chance of tropical
    cyclone formation through 5 days.

    $$
    GR
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