WEATHER BULLETIN FOR THE HIGH SEAS FOR METAREA VII.
ISSUED BY THE SOUTH AFRICAN WEATHER SERVICE ON THE
05TH OF DECEMBER 2025 AT 13:30 UTC.
FOR SOUTH-EAST SECTOR OF METAREA. VII, PREPARED BY REUNION, SEE AREA 2
BELOW.
NOTE: WX OBSERVATIONS.
======================
COULD ALL VESSELS EXPERIENCING UNEXPECTED, SEVERE WX/SEA STATE PLEASE
MAKE EVERY EFFORT TO REPORT THIS TO SAWS VIA CAPE TOWN RADIO.
AREA 1:
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FORECAST VALID FROM 052200 TO 062200 UTC:
WIND IN KNOTS, WAVE HEIGHTS IN METERS. NO SEA STATE GIVEN IF WAVES LESS THAN 3M.
NOTE THE WIND SPEEDS QUOTED HERE ARE THE EXPECTED AVERAGE SPEEDS.
INDIVIDUAL GUSTS MAY EXCEED THESE VALUES BY A FACTOR OF UP TO 1.5.
WAVE HEIGHTS ARE SIGNIFICANT WAVE HEIGHTS, WHICH MAY BE ACCOMPANIED BY INDIVIDUAL WAVES 1.5 TO 2.0 TIMES HIGHER.
GALE FORCE WARNINGS:
====================
1. MARION FORTIES EAST: W to NW 35 in the south, drifting to the south-east
towards mid-period, but SW 35 in the south-west
towards the end of the period.
SYNOPTIC CHART 12:00Z
=====================
High 1027 hPa 35s01w, High 1021 hPa 33s53e
Low 991 hPa 47s39e
1. Cold Front : 36s29e 40s31e 44s39e into 47s39e
AREA FORECAST:
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ASCENSION (06S/15S, 00E/20W):
WIND : SE to E 05 to 15.
VIS : Good.
ANGOLA (06S/15S, 00E/00N):
WIND : S to SE 05 to 15 but SW 05 to 15 in the east.
VIS : Good, but moderate in showers and thundershowers in the extreme
east and north-east at times.
ST HELENA (15S/30S, 00E/20W):
WIND : SE to E 10 to 20, but N to NW 05 to 15 in the south-west.
VIS : Good.
TRADES (15S/30S, 00E/WEST COAST):
WIND : S to SE 15 to 25 reaching 30 in the south-east towards mid-
period, but variable 05 to 10 in the north-east.
VIS : Good.
SEA STATE: 3.0m in the south-east, with S to SW swell.
TRISTAN (30S/40S, 00E/20W):
WIND : Anticyclonic 05 to 15 in the east, otherwise N to NW 10 to 20
reaching 25 in the south-west, spreading to the south-east by
mid-period.
VIS : Good, but moderate in showers and rain in the western and central
parts, spreading to the south-east by mid-period
SEA STATE: 3.0m in the south, with W to SW swell.
CAPE WEST (30S/40S, 00E/20E):
WIND : W to SW 15 to 25 in the south-east, otherwise S to SE 10 to 20
reaching 25 to 30 in places in the north-east, but anticyclonic
05 to 15 in the west. It will become NW 15 to 25 in the south-
west from mid-period.
VIS : Good, becoming moderate in showers and rain in the south-west
from mid-period.
SEA STATE: 3.0 to 3.5m in the south, but in the north-east from mid-period
with S to SW swell.
CAPE EAST (32.5S/40S, 20E/50E):
WIND : Variable 05 to 10 in the north-east, otherwise W to SW 10 to 20
reaching 25 in the south-west, but NW to N 10 to 20 over the
central parts. It will become S to SE 10 to 20 in the west from
mid-period.
VIS : Good, but moderate in showers and rain in the south and west but
poor in showers and thundershowers in the northern and central
parts, drifting to the eastern parts towards the end of the
period.
SEA STATE: 3.0m in the south-west and south-east, with SW swell.
DURBAN EAST (32.5S/25S, EAST COAST/55E):
WIND : NW 15 to 25 in the south, otherwise E to NE 10 to 20 reaching 25
to 30 in the north-west, but S to SW 10 to 20 in the west, where
it will become SE 10 to 20 towards the end of the period.
VIS : Good but moderate in showers and thundershowers in places in the
extreme west, but poor in the south-west, drifting to the south
towards the end of the period.
SEA STATE: 3.0m in the east and extreme west until mid-period, with S to SW
swell.
MOZAMBIQUE CHANNEL:
WIND : Variable 05 to 10 in the north, otherwise S to SE 10 to 20
reaching 25 in the south-east, but N to NE 10 to 20 in the south-
west.
VIS : Good, but moderate to poor in showers and thundershowers in
places in the northern and central parts.
MADAGASCAR EAST (10S/25S, EAST COAST/55E):
WIND : NE to E 05 to 15, but S to SE 05 to 15 in the south-west until
mid-period.
VIS : Moderate to poor in showers and thundershowers in places.
MARION FORTIES EAST (40S/50S, 35E/50E):
WIND : W to NW 20 to 30 reaching 35 in the south, drifting to the south-
east towards mid-period while becoming SW 15 to 25 in the west,
reaching 35 in the south-west towards the end of the period.
VIS : Good, but moderate in showers and rain in the east at first, but
in the west towards mid-period, drifting to the east towards the
end of the period.
SEA STATE: 3.0 to 4.0m in the southern half but in the north-east at first,
with W to SW swell.
AREA 2:
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MARINE METEOROLOGICAL BULLETIN FROM METEO-FRANCE/LA REUNION ON AREA ACK (AMSTERDAM-CROZET-KERGUELEN)
2025/12/05 AT 0500UTC
AVERAGED WIND SPEED ON BEAUFORT SCALE. (WIND GUSTS MAY BE ABOUT 40% STRONGER THAN THE AVERAGES GIVEN HERE).
PART 1: WARNING
- NIL.
PART 2: GENERAL SYNOPSIS, 2025/12/05 AT 0000UTC
- LOW 959 NEAR 57S/79E, MOVING SOUTHEASTWARDS. ASSOCIATED FRONT OVER AMS.
- NEW LOW 990 AT END JUST SOUTHWEST OF CRO, WITH ASSOCIATED COLD FRONT.
- HIGH 1020 VERY SOON IN NORTHERN AREAS.
PART 3: FORECAST FOR 24 HOURS FROM 2025/12/05 AT 0600UTC TO 2025/12/06 AT 0600UTC
WAM (30S/40S, 50E/65E)
SCATTERED SHOWERS IN SOUTH. RAIN AT FIRST IN FAR NORTHEAST.
WIND: SOUTHWESTERLY 3 TO 5, LOCALLY 6 IN SOUTHEAST, BECOMING ANTICLOCKWISE 2
TO 4 FROM WEST.
SEA : ROUGH OR VERY ROUGH, DECREASING.
VIS : POOR OR VERY POOR IN PRECIPITATION.
AMS (30S/40S, 65E/80E)
FRONTAL RAIN OR SHOWERS.
WIND: NORTHEAST 4 OR 5 IN NORTHEAST, BUT SOUTHWESTERLY ELSEWHERE, BECOMING
ANTICLOCKWISE 2 TO 4 FROM WEST AT END. GUSTS.
SEA : MODERATE OR ROUGH, LOCALLY VERY ROUGH IN SOUTH.
VIS : POOR OR VERY POOR IN PRECIPITATION.
CRO (40S/50S, 50E/65E)
RAIN OR SHOWERS.
WIND: SOUTHWEST 5 OR 6, INCREASING NORTHWEST 6 OR 7 FROM WEST LATER. SEVERE
GUSTS.
SEA : MODERATE OR ROUGH, BUT ROUGH OR VERY ROUGH IN NORTH TILL 05 AT 18 UTC.
VIS : POOR OR VERY POOR IN PRECIPITATION.
KER (40S/50S, 65E/80E)
RAIN OR SHOWERS, AT TIMES THUNDERY.
WIND: WEST OR NORTHWEST 6 OR 7. SEVERE GUSTS.
SEA : ROUGH OR VERY ROUGH.
VIS : POOR OR VERY POOR IN PRECIPITATION.