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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