Western Area High Seas Forecast

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 17 October 2025

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

Melbourne Gale Warning 2.
Melbourne Gale Warning 4.
Melbourne Gale Warning 5.

Part 2 Situation at 170600 UTC
Cold front near 28S106E 43S115E. Forecast near 38S128E 49S131E at 180600UTC,
exiting east thereafter.

Low [1] 976hPa near 45S105E. Forecast slow moving until 171500UTC, then low [1]
991hPa near 40S107E at 181200UTC.

Low [2] 993hPa near 47S094E. Forecast low [2] 1008hPa near 40S095E at 180000UTC
and decaying thereafter.

Warm front near 43S119E 45S108E. Forecast 45S129E to developing low [3] 983hPa
near 47S117E at 171800UTC, then southeast of area near 51S147E to low [3]
964hPa near 51S132E at 181200UTC.

Trough [1] near 28S100E 41S103E 45S099E. Forecast near 32S108E 37S111E at
180000UTC and decaying thereafter.

Trough [2] forecast developing near 45S116E 47S121E at 180000UTC, then near
44S122E 50S132E at 181200UTC.

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

South of line 36S080E 27S099E 34S129E, outside warning areas:
Westerly quarter winds, shifting northerly quarter within 420nm east of cold
front, shifting northeasterly quarter within 120nm south of warm front,
shifting southeasterly quarter southwest of trough [2], and turning clockwise
within 300nm of low [1], within 120nm of low [3] and within 300nm of low [2] in
the western semicircle. Southwesterly quarter winds also west of trough [1].
Winds speeds 20/33 knots. Rough to very rough seas. Moderate to heavy swell.

Remainder:
Winds not exceeding 25 knots. Moderate to rough seas. Low to moderate swell,
increasing up to heavy south of line 27S090E 27S105E.

Rain areas, scattered showers and isolated thunderstorms mostly within 180nm of
cold front, troughs and within 180nm of lows. 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 Friday.