AXAU01 APRF 112140
IDW27600
TROPICAL CYCLONE TECHNICAL BULLETIN: AUSTRALIA - WESTERN REGION
Issued by AUSTRALIAN BUREAU OF METEOROLOGY TROPICAL CYCLONE WARNING CENTRE
at: 2140 UTC 11/04/2021

Name: Ex-Tropical Cyclone Seroja
Identifier: 22U
Data At: 2100 UTC
Latitude: 31.7S
Longitude: 118.6E
Location Accuracy: within 20 nm [35 km]
Movement Towards: southeast [133 deg]
Speed of Movement: 32 knots [60 km/h]
Maximum 10-Minute Wind: 40 knots [75 km/h]
Maximum 3-Second Wind Gust: 55 knots [100 km/h]
Central Pressure: 983 hPa
Radius of 34-knot winds NE quadrant: 60 nm [110 km]
Radius of 34-knot winds SE quadrant: 40 nm [75 km]
Radius of 34-knot winds SW quadrant:
Radius of 34-knot winds NW quadrant:
Radius of 48-knot winds NE quadrant:
Radius of 48-knot winds SE quadrant:
Radius of 48-knot winds SW quadrant:
Radius of 48-knot winds NW quadrant:
Radius of 64-knot winds:
Radius of Maximum Winds:
Dvorak Intensity Code: over land
Pressure of outermost isobar: 996 hPa
Radius of outermost closed isobar: 95 nm [175 km]

FORECAST DATA
Date/Time : Location : Loc. Accuracy: Max Wind : Central Pressure
[UTC] : degrees : nm [km]: knots[km/h]: hPa
+06: 12/0300: 33.8S 121.9E: 045 [085]: 030 [055]: 990
+12: 12/0900: 36.0S 125.5E: 065 [120]: 030 [055]: 989
+18: 12/1500: 38.4S 128.9E: 085 [155]: 030 [055]: 988
+24: 12/2100: : : :
+36: 13/0900: : : :
+48: 13/2100: : : :
+60: 14/0900: : : :
+72: 14/2100: : : :
+96: 15/2100: : : :
+120: 16/2100: : : :

REMARKS:
Current position of Seroja accuracy is good due to nearby surface observations. The system has weakened below tropical cyclone strength.

As the system is over land Dvorak is not applicable. Recent surface observation have recorded mean wind speeds of 32 knots [gusting to 43 knots]. Intensity set at 40 knots in the eastern quadrants.

The system made landfall between Kalbarri and Northampton around 1130Z as a category 3 system. It has continued to weaken as it moves southeast over land under the influence of a mid-level high to the northeast and an approaching mid-latitude trough to the southwest.

It will continue to move quickly to the southeast at approximately 35 knots during Monday morning. Seroja is expected to move off the south coast of Western Australia during Monday afternoon and weaken further.

Copyright Commonwealth of Australia
==
The next bulletin for this system will be issued by: 12/0130 UTC.
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