IDY10210
SECURITE
Updated High Seas Forecast for South Eastern METAREA 10
SOUTH EASTERN AREA: COAST AT 25S TO 25S170E TO 29S170E TO 45S160E TO 50S160E TO
50S129E TO COAST AT 129E
Issued by the Australian Government Bureau of Meteorology
For 24 hours commencing 1100 UTC 27 December 2025
Part 1 Warnings
Refer to latest warnings for details of the area affected.
Melbourne Gale Wind Warning 2.
Part 2 Situation at 270600 UTC
Low [1] 999hPa east of area near 41S164E. Forecast 1001hPa near 33S166E at
281200UTC.
Trough [1] from low [2] 999hPa near 24S163E to 25S170E. Forecast 28S171E to low
[2] 992hPa east of area near 25S169E at 280600UTC, then exiting east of area.
Low [2] 1001hPa north of area near 25S160E to trough 29S170E. Forecast trough
25S167E to low [2] 997hPa near 28S170E at 280000UTC.
Cold front near 40S131E 50S129E. Forecast near 46S141E 50S142E at 280600UTC,
then weakening.
Forecast trough [2] entering area from west near 46S130E to low [3] 983hPa
moving south of area near 50S129E at 271500UTC, and trough [2] near 47S135E
50S134E at 272100UTC, moving south of area thereafter.
Part 3 Forecast
Refer to latest warnings for boundary of affected area and type of weather
system.
West of line 50S143E 44S139E 41S129E, outside warning area:
Westerly quarter winds shifting northerly quarter east of cold front, shifting
northwesterly quarter west of cold front and east of trough. Wind speeds 20/33
knots. Rough to very rough seas. Moderate to heavy swell.
North of line 33S152E 46S160E: Southerly quarter winds, shifting southeasterly
within 300nm south of trough, shifting northwesterly north of trough, turning
clockwise within 90nm of low [2] and within 420nm of low [1]. Wind speed 20/33
knots. Rough seas. Moderate swell.
Remainder:
Winds not exceeding 25 knots. Moderate to rough seas. Low to moderate swell,
increasing to heavy swell west of line 33S129E 39S135E 50S141E.
Rain areas, scattered showers and isolated thunderstorms mostly within 180nm of
troughs, cold front, and within 180nm of low [2] and within 420nm of low [1].
Heavy at times within 120nm of low [2]. 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 20:00 UTC Saturday.
IDY10230
SECURITE
Updated High Seas Forecast for North Eastern METAREA 10
NORTHEASTERN AREA: EQUATOR TO 25S, 142E TO 170E
Issued by the Australian Government Bureau of Meteorology
For 24 hours commencing 1100 UTC 27 December 2025
Part 1 Warnings
Nil.
Part 2 Situation at 270600 UTC
Trough 18S147E 19S153E to low 999hPa near 24S163E to 25S170E. Forecast trough
14S153E 15S161E 23S170E at 281200UTC.
Low [1] 999hPa near 24S163E. Forecast 999hPa moving southeast of area near
26S170E at 280000UTC.
Part 3 Forecast
South of line 18S146E 14S161E 18S170E:
Northwesterly quarter winds east of trough, shifting southeasterly quarter
south of trough. Wind speeds 20/30 knots. Rough seas. Low to moderate swell.
Remainder:
Winds not exceeding 20 knots. Slight to moderate seas. Low swell.
Rain areas, scattered showers and isolated thunderstorms mostly within 240nm of
trough, west of line 06S144E 22S152E and north of line 04S151E 02S165E. Heavy
at times within 120nm of trough south of 21S. 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 20:00 UTC Saturday.
IDY10220
SECURITE
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 1100 UTC 27 December 2025
Part 1 Warnings
Refer to latest warnings for details of the area affected.
Storm Force Wind Warning issued by TCWC La Reunion for Tropical Cyclone "Grant".
Melbourne Gale Wind Warning 2.
Part 2 Situation at 270600 UTC
Tropical Cyclone "Grant" 986hPa near 11.9S89.3E west of area.
Tropical Low (08U) 1004hPa near 12S119E. Forecast Tropical Low (08U) 1005hPa
near 13S119E at 281200UTC.
Trough [1] near 42S125E to low [1] 981hPa near 47S123E. Forecast 46S130E to low
[1] 983hPa near 50S129E at 271500UTC and exiting area thereafter.
Trough from low [1] near 45S118E to 50S118E. Forecast trough from low [1] near
49S127E to 50S126E at 271200UTC, and south of area thereafter.
Part 3 Forecast
Refer to latest warnings for boundary of affected area and type of weather
system.
West of line 23S090E 19S095E 12S090E, outside warning area:
Southeasterly quarter winds 20/30 knots turning clockwise 20/33 knots around
Tropical Cyclone "Grant". Rough to very rough seas. Moderate to heavy swell.
South of line 50S094E 45S100E 41S129E, outside warning area:
Southwesterly quarter winds tending westerly quarter from 271200UTC. Winds
shifting northerly quarter east of trough, and clockwise within 300nm of low
[1]. Wind speeds 20/33 knots. Rough to very rough seas. Moderate to heavy swell.
West of line 41S080E 50S094E:
Northwesterly quarter winds below 25 knots, increasing to 25/33 knots from
270000UTC. Moderate to rough seas, rising to very rough seas from 270000UTC.
Moderate to heavy swell.
Area bounded by 16S112E 26S102E 35S116E 19S116E:
Southerly quarter winds 20/30 knots. Rough seas. Low to moderate swell.
Remainder:
Winds not exceeding 25 knots. Slight to moderate seas. Low to moderate swell,
rising to heavy south of line 50S093E 45S095E 34S117E.
Rain areas, scattered showers and isolated thunderstorms mostly within 180nm of
trough and lows. Heavy at times within 180nm of Tropical Cyclone "Grant" and
Tropical Low (08U). 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 20:00 UTC Saturday.
40:2:1:31:11:01:00
IDY10240
SECURITE
HIGH SEAS FORECAST FOR NORTHERN METAREA 8/10/11
NORTHERN AREA: EQUATOR TO 12S, 90E TO 142E AND SOUTHWARD TO COAST,
125E TO 142E
ISSUED BY THE AUSTRALIAN GOVERNMENT BUREAU OF METEOROLOGY
FOR 24 HOURS COMMENCING 1100 UTC 27 DECEMBER 2025
PART 1 WARNINGS
REFER TO LATEST WARNINGS FOR DETAILS OF THE AREA AFFECTED.
STORM FORCE WIND WARNING ISSUED BY TCWC LA REUNION FOR TROPICAL
CYCLONE "GRANT".
PART 2 SITUATION AT 270600 UTC
TROPICAL CYCLONE "GRANT" 986HPA NEAR 11.9S89.3E WEST OF AREA.
TROUGH NEAR 12S090E 09S117E TO TROPICAL LOW (08U) 1004HPA NEAR
12S119E.
FORECAST TROUGH 11S090E 08S114E TO TROPICAL LOW (08U) 1005HPA NEAR
13S119E AT
281200UTC.
MONSOON TROUGH OVER AUSTRALIA NEAR 18S142E 18S139E 14S135E. FORECAST
SLOW
MOVING.
PART 3 FORECAST
REFER TO LATEST WARNINGS FOR BOUNDARY OF AFFECTED AREA AND TYPE OF
WEATHER
SYSTEM.
WITHIN 180NM OF TROPICAL CYCLONE GRANT, OUTSIDE 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 09S131E 08S136E 10S142E:
NORTHWESTERLY QUARTER WINDS 20/30 KNOTS. ROUGH SEAS. LOW SWELL.
SOUTH OF LINE 09S116E 10S123E:
NORTHWESTERLY QUARTER WINDS, SHIFTING WESTERLY QUARTER WEST OF TROUGH
AND
TURNING CLOCKWISE WITHIN 60NM OF TROPICAL LOW (08U). WIND SPEEDS
20/30 KNOTS.
ROUGH SEAS. LOW TO MODERATE SWELL.
REMAINDER:
WINDS NOT EXCEEDING 20 KNOTS. SLIGHT TO MODERATE SEAS. LOW SWELL,
INCREASING TO
MODERATE SOUTH OF LINE 02S090E 09S118E 12S120E.
RAIN AREAS, SCATTERED SHOWERS AND ISOLATED THUNDERSTORMS THROUGHOUT
AREA. HEAVY
AT TIMES WITHIN 120NM OF TROPICAL CYCLONE "GRANT" AND TROPICAL LOW
(08U), AND
WITHIN 180NM OF MONSOON TROUGH. SQUALLS POSSIBLE SOUTH OF LINE
09S131E 08S136E
10S142E. 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 19:15 UTC SATURDAY.=