WEATHER BULLETIN FOR THE HIGH SEAS FOR METAREA VII.
ISSUED BY THE SOUTH AFRICAN WEATHER SERVICE ON THE
12th OF SEPTEMBER 2026 AT 08:30 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:
=======
FORECAST VALID FROM 121000 TO 131000 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. TRISTAN: Cyclonic 35 to 40 in the south-west from mid-period.
2. CAPE WEST: S to SE 35 in the central east until towards the end of the
period.
3. CAPE EAST: S to SE 35 in the north-west towards the end of the period.
4. MARION FORTIES EAST: SW to W 35 to 40 in the south.
SYNOPTIC CHART 06:00Z
=====================
High 1031 hPa 38s01w, High 1024 hPa 26s59e.
Low 1010 hPa 29s16e, Low 1013 hPa 24s02e.
1. Cold Front: 47s34e 49s41e 53s48e 56s52e into 60s44e.
2. Cold Front: 31s46e 34s52e 38s58 into 41s59e.
AREA FORECAST:
==============
ASCENSION (06S/15S, 00E/20W):
WIND : S to SE 05 to 15 reaching 20 in the west until mid-period.
VIS : Good.
ANGOLA (06S/15S, 00E/00N):
WIND : S to SW 05 to 15.
VIS : Good.
ST HELENA (15S/30S, 00E/20W):
WIND : SW 05 to 15 in the north-east, otherwise SE to E 15 to 25
reaching 30 in the south-east at first. It will become NW to N
15 to 25 in the south-west towards mid-period.
VIS : Good but moderate to poor in showers and thundershowers in
the south-east at first.
SEA STATE: 3.0 to 4.0m reaching 4.5 to 5.0m in the south-east until mid-
period, with SE swell.
TRADES (15S/30S, 00E/WEST COAST):
WIND : SW to W 05 to 15 in the northern and central parts, otherwise
SE to E 20 to 30. It will become NW to N 10 to 20 in the
east from mid-period.
VIS : Good but moderate to poor in showers and thundershowers in the
south.
SEA STATE: 3.5 to 4.5m except in the north, with SE to S swell.
TRISTAN (30S/40S, 00E/20W):
WIND : Anticyclonic 05 to 15 in the south-east at first and north-
east towards the end of the period, otherwise NW to N 20 to 30
drifting to the east from mid-period while becoming cyclonic
35 to 40 in the south-west, but SE 15 to 25 in the north-east.
VIS : Good but moderate to poor in showers and thundershowers in the
south-west spreading to the north-western and central parts by
mid-period.
SEA STATE: 3.0 to 4.0m except across the north-west to south-east at
first, reaching 4.5 to 5.5m in the south-west from mid-period,
with NW swell but SE swell in the north-east.
CAPE WEST (30S/40S, 00E/20E):
WIND : Anticyclonic 10 to 15 in the south-west, otherwise S to SE 10
to 20 reaching 25 to 35 in the north. It will become N 10 to
20 in the south-west towards the end of the period.
VIS : Good but moderate to poor in showers and thundershowers in the
Central-north and north-eastern parts.
SEA STATE: 3.5 to 4.5m except in the south-west reaching 5.0m in the
central east, with SW swell in the south-east, otherwise SE
swell.
CAPE EAST (32.5S/40S, 20E/50E):
WIND : SE to E 20 to 30 in the west reaching 35 in the north-west
towards the end of the period, otherwise SW to S 15 to 25
reaching 30 in the south-east, but variable 05 to 10 in the
central parts until mid-period.
VIS : Good but moderate to poor in showers and thundershowers in the
north-west but moderate in showers and rain in the south-east.
SEA STATE: 3.0 to 4.0m reaching 4.5 to 5.0m in the north-west from mid-
period and extreme south-east towards the end of the period,
with SW swell, but SE swell in the north-west.
DURBAN EAST (32.5S/25S, EAST COAST/55E):
WIND : NE to N 10 to 20 in the west reaching 25 to 30 in the extreme
south-west from mid-period, otherwise S 10 to 20, but NW 10 to
20 in the east reaching 25 to 30 in the south-east at first.
VIS : Good but moderate in showers and rain in the south-east until
mid-period and in the south-west by mid-period.
SEA STATE: 3.0 to 3.5m in the extreme south, with SW swell but SE swell
in the south-west.
MOZAMBIQUE CHANNEL:
WIND : SE 05 to 15 in the south-west, otherwise S to SW 10 to 20.
VIS : Good.
MADAGASCAR EAST (10S/25S, EAST COAST/55E):
WIND : Anticyclonic 05 to 15 in the south, otherwise E to SE 15 to
25.
VIS : Good but moderate in showers and rain in the north.
MARION FORTIES EAST (40S/50S, 35E/50E):
WIND : SW to W 20 to 30 reaching 35 to 40 in the south, moderating 10
to 20 in the north-west by the end of the period.
VIS : Good but moderate in showers and rain in the south spreading
to the north from mid-period with possible snow-showers in the
south.
SEA STATE: 5.0 to 7.0m but 8.0 to 9.0m in the south-east, but 3.5 to 4.5m
in the north at first, with W to SW swell.
AREA 2:
======
MARINE METEOROLOGICAL BULLETIN FROM METEO-FRANCE/LA REUNION ON AREA ACK AMSTERDAM-CROZET-KERGUELEN)
2026/09/12 AT 0500UTC
AVERAGED WIND SPEED ON BEAUFORT SCALE. (WIND GUSTS MAY BE ABOUT 40% STRONGER THAN THE AVERAGES GIVEN HERE).
PART 1: WARNING
- GALE TO SEVERE GALE CONTINUING OR EXPECTED IN ALL AREAS.
PART 2: GENERAL SYNOPSIS, 26/09/12 AT 0000UTC
- LOW 996 NEAR 40S/55E, MOVING EASTWARDS AND FILLING, EXPECTED 987 NEAR 43S/69E THE 12 AT 18 UTC, WITH ASSOCIATED DISTRUBANCE.- COLD FRONTS CROSSING FAR SOUTHERN PART OF THE BASIN.- HIGH BELT 1023 ALONG 28E BETWEEN 52E AND 85E, WEAKENING.
PART 3: FORECAST FOR 24 HOURS FROM 26/09/12 AT 0600UTC TO 26/09/13 AT 0600UTC
WAM (30S/40S, 50E/65E)
FRONTAL RAIN OR SHOWERS.
WIND: NORTHWEST 5 OR 6, AT TIMES 7, BACKING SOUTHWEST BEHIND THE FRONT,
BUT OCCASIONALLY 8 OR 9 IN FAR SOUTHEAST TILL 12 AT 21 UTC. SEVERE
GUSTS.
SEA: ROUGH OR VERY ROUGH, OCCASIONALLY HIGH AND CROSSED IN SOUTH IN SW
SWELL 4 OR 5M.
VIS: POOR IN PRECIPITATION.
AMS (30S/40S, 65E/80E)
FRONTAL RAIN OR SHOWERS.
WIND: MAINLY SOUTHWEST 3 TO 5, INCREASING NORTHWEST 6 OR 7 FROM WEST, AT
TIMES 8, BACKING LATER SOUTHWEST BEHIND THE FRONT AND INCREASING
TEMPORARILY 8 OR 9 IN FAR SOUTHWEST.SEVERE GUSTS.
SEA: ROUGH OR VERY ROUGH, BECOMING LOCALLY HIGH IN SOUTHWEST LATER. SW
SWELL 5 M IN SOUTH.
VIS: POOR IN PRECIPITATION.
CRO (40S/50S, 50E/65E)
FRONTAL RAIN OR SHOWERS. FEW SNOW SHOWERS IN SOUTH.
WIND: WESTERLY INCREASING 6 OR 7, BUT OCCASIONALLY CLOCKWISE 7 OR 8, AT
TIMES 9, IN NORTH TILL 12 AT 21 UTC. SEVERE GUSTS.
SEA: ROUGH OR VERY ROUGH, OCCASIONALLY HIGH. SW SWELL 3 TO 5 M.
VIS: POOR IN PRECIPITATION.
KER (40S/50S, 65E/80E)
FRONTAL RAIN OR SHOWERS. FEW SNOW SHOWERS IN SOUTH.
WIND: DECREASING WESTERLY 4 OR 5, BUT SOUTHWEST 7 OR 8 IN SOUTHEAST AT
FIRST, INCREASING CLOCKWISE 7 OR 8 SOON IN NORTH, AT TIMES 9.
SEVERE GUSTS.
SEA: VERY ROUGH OR HIGH. SW SWELL 5 OR 6 M, ABATING LATER.
VIS: POOR IN PRECIPITATION.