FQAU23 AMMC 242123
IDY10220
SECURITE

Updated High Seas Forecast for Western METAREA 10
12S TO 30S BETWEEN 90E AND 125E, AND 30S TO 50S BETWEEN 80E AND 129E

Issued by the Australian Government Bureau of Meteorology
For 24 hours commencing 2300 UTC 24 December 2025

Part 1 Warnings
Refer to latest warnings for details of the area affected.

Gale Warning issued by TCWC Melbourne for Tropical Cyclone "Grant".

Part 2 Situation at 241800 UTC
Tropical Cyclone "Grant" 997hPa near 11.9S97.4E. Forecast Tropical Cyclone
"Grant" 980hPa near 11.8S93.9E at 260000UTC.

Low [2] 1003hPa near 15S117E. Forecast low [2] 1006hPa near 13S118E at
260000UTC.

Cold front 37S099E 50S110E. Low [1] 996hPa forecast to develop near 42S113E at
251500UTC, and cold front 35S119E to low [1] 989hPa near 42S114E to cold front
50S118E at 260000UTC.

Forecast trough entering from west near 44S080E 50S079E. Forecast near 45S099E
50S102E at 260000UTC.

Part 3 Forecast
Refer to latest warnings for boundary of affected area and type of weather
system.

Within 240nm of Tropical Cyclone "Grant", outside of warning area:
Clockwise winds around Tropical Cyclone "Grant". Wind speeds 20/33 knots. Rough
to very rough seas. Moderate to heavy swell.

South of line 32S094E 29S115E:
Southwesterly quarter winds, shifting northwesterly quarter east of cold front,
and westerly quarter west of trough. Wind speeds 20/30 knots. Rough seas.
Moderate to heavy swell.

South of line 32S094E 29S115E:
Westerly quarter winds 20/30 knots. Rough seas. Moderate swell.

Remainder:
Winds not exceeding 25 knots. Slight to moderate seas. Low to moderate swell.

Rain areas, scattered showers and isolated thunderstorms mostly within 180nm of
front and low, and east of line 12S112E 18S112E. Heavy at times within 180nm of
Tropical Cyclone "Grant". Visibility reducing below 2nm in precipitation.

Please be aware
Wind and wave forecasts are averages. Wind gusts can be 40 per cent stronger
than the forecast, and stronger still in squalls and thunderstorms. Maximum
waves can be twice the forecast height.

WEATHER MELBOURNE

The next routine forecast will be issued at 08:00 UTC Thursday.