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 2300 UTC 18 August 2026
Part 1 Warnings
Refer to latest warnings for boundary of affected area and type of weather
system.
Melbourne Gale Warning 12.
Part 2 Situation at 181800 UTC
Cold front [1] 37S116E 50S120E. Forecast decaying cold front [1] 37S127E
50S129E at 190900UTC, east of area thereafter.
Cold front [2] 42S105E 50S101E. Forecast cold front [2] 44S125E 50S129E at
200000UTC.
Forecast warm front entering area from west near 43S085E 47S080E at 190900UTC.
Forecast warm front 45S101E 48S094E 49S089E at 200000UTC.
Trough 12S092E 22S100E 24S105E. Forecast trough 13S096E 20S102E 23S110E at
200000UTC.
Part 3 Forecast
Refer to latest warnings for details of the area affected.
South of line 36S080E 35S129E, outside warning areas:
Westerly quarter winds shifting northerly quarter winds within 240nm east of
cold front [1], shifting northwesterly quarter within 420nm west of cold front
[2] . Wind speeds 20/33 knots. Rough to very rough seas. Moderate to heavy
swell.
West of trough:
Southerly quarter winds 20/30 knots. Rough seas. Moderate to heavy swell.
Remainder:
Winds not exceeding 25 knots. Slight to moderate seas. Low to moderate swell,
increasing to heavy south of line 23S090E 27S114E and north of line 17S090E
16S097E.
Rain areas, scattered showers and isolated thunderstorms mostly within 240nm of
features. Heavy at times within 120nm of trough. 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 09:00 UTC Wednesday.
