WEATHER BULLETIN FOR THE HIGH SEAS FOR METAREA VII.
ISSUED BY THE SOUTH AFRICAN WEATHER SERVICE ON THE
12TH OF AUGUST 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:
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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: W to NW 35 in places in the far western and eastern parts
while becoming SW 35 over the western parts from mid-period
while spreading to the central parts it will moderate.
2. CAPE WEST: E to NE 35 at times in the south-east.
3.MARION FORTIES EAST: W to SW 35 in the south-east until mid-period.
SYNOPTIC CHART 06:00Z
=====================
High 1046 hPa 41s26e.
Low 1022 23s09e Low 986 hPa 49s07w.
Cold Front: 24s18e 28s13w 36s06w 43s02w into 49s07w.
AREA FORECAST:
==============
ASCENSION (06S/15S, 00E/20W):
WIND : E to SE 05 to 15.
VIS : Good.
SEA STATE: 3.0 in the south-east at first, becoming 3.o m in the
southwest towards end of the period, with S to SE swell
ANGOLA (06S/15S, 00E/00N):
WIND : S to SE 05 to 15 but SW to W 05 to 10 in the east.
VIS : Good.
SEA STATE: 3.0 in the south-west until mid-period, with S to
SE swell.
ST HELENA (15S/30S, 00E/20W):
WIND : N to NW 15 to 25 but W to SW 15 to 25 in the south-west
spreading to the south-east towards end of the period.
VIS : Good, but moderate to poor in a band of showers and
thundershowers across from the north-west to the south-east
and in the south-west until mid-period.
SEA STATE: 3.0 to 4.0m, reaching 4.5 to 5.5m in the south-west, with S to
SE swell.
TRADES (15S/30S, 00E/WEST COAST):
WIND : Variable 05 to 15 but E to SE 15 to 25 in the southern parts
until mid-period, when it will become NW 10 to 20 in the
south-west.
VIS : Good.
SEA STATE: 3.0 to 3.5m in the south and west, with SE swell.
TRISTAN (30S/40S, 00E/20W):
WIND : W to NW 15 to 25 reaching 30 to 35 in places in the far
western and eastern parts while becoming SW 25 to 35 over the
western parts from mid-period while spreading to the central
parts it will moderate to 20 to 30 towards end of period.
VIS : Good but moderate to poor in showers and thundershowers in
eastern and far western parts, spreading to the eastern parts
while clearing from the west by end of period.
SEA STATE: 3.0 to 4.0m, reaching 5.0 to 6.0m in the western and southern
parts, with W to SW swell.
CAPE WEST (30S/40S, 00E/20E):
WIND : E to NE 15 to 25, reaching 30 to 35 at times in the south-
east, but N to NW 15 to 25 in the west.
VIS : Good, becoming moderate in rain and showers in the west by end
of period.
SEA STATE: 3.0 to 4.0m, reaching 4.5 to 5.5 in the south-east, with E to
SE swell but NW in the west.
CAPE EAST (32.5S/40S, 20E/50E):
WIND : S to SE 15 to 25 but E to NE 15 to 25 in the west, reaching 30
to 35 in the north-west and west at times.
VIS : Good.
SEA STATE: 3.0 to 4.0m, reaching 4.5 to 5.0m in the west, with W to SW
swell but NW swell in the west.
DURBAN EAST (32.5S/25S, EAST COAST/55E):
WIND : SE to E 15 to 25, reaching 30 in places in the north.
VIS : Good but moderate to poor in showers and thundershowers in
Places in the north.
SEA STATE: 3.0 to 4.0m, reaching 4.5 to 5.0m over the central-north, with
S to SE swell.
MOZAMBIQUE CHANNEL:
WIND : S to SE 05 to 15, reaching 20 to 30 in places in the south.
VIS : Good, becoming moderate to poor in showers and thundershowers
over the southern parts.
SEA STATE: 3.0 to 4.0m in the southern parts reaching 4.5 to 5.0m while
spreading the central parts towards end of the period, with S
to SE swell.
MADAGASCAR EAST (10S/25S, EAST COAST/55E):
WIND : E to SE 10 to 20, but variable 05 to 15 in the south.
VIS : Good, but moderate in showers and thundershowers in the south.
SEA STATE: 3.0m in the far northern and southern parts, with E to SE
swell but SW in the southern parts.
MARION FORTIES EAST (40S/50S, 35E/50E):
WIND : W to SW 15 to 25 reaching 30 to 35 in the south-east until
mid-period.
VIS : Good.
SEA STATE: 3.0 to 4.0m reaching 5.0 to 6.0m in the southern parts but 6.5
to 8.5 in the south-east from mid-period, 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)
26/08/12 AT 0600UTC
AVERAGED WIND SPEED ON BEAUFORT SCALE. (WIND GUSTS MAY BE ABOUT 40%
STRONGER THAN THE AVERAGES GIVEN HERE).
PART 1: WARNING
- STRONG GALE FORCE 9 OVER CRO AND KER.- GALE FORCE 8 OVER AMS.
PART 2: GENERAL SYNOPSIS, 26/08/12 AT 0000UTC
-A LOW-PRESSURE SYSTEM MOVING SOUTH OF KER, MOVING EASTWARD 25KT,
EXPECTED 950 HPA NEAR 58S/69E THE 12 AT 12 UTC.- COLD FRONT AXIS:
32S/58E, 38S/68E, 40S/72E, 41S/75E, 43S/80E, MOVING NORTH-EASTWARD
15/20KT.
- A HIGH-PRESSURE SYSTEM APPROACHING FROM THE SOUTHWEST WAM
COMING SOON.
PART 3: FORECAST FOR 24 HOURS FROM 26/08/12 AT 0600UTC TO 26/08/13 AT
0600UTC
WAM (30S/40S, 50E/65E)
FRONTAL SHOWERS.
WIND: NORTH-WEST 4 TO 6 AHEAD OF THE FRONT OVER NORTH-EASTERN, BACKING
SOUTHERLY TO SOUTH-EAST 4 TO 6 BEHIND. SETTING-UP SOUTH-WEST 5 TO 6 BY
SOUTHERN LATER, INCREASING 6 TO 7 OVER FAR SOUTH-EASTERN AT END.
SEA : ROUGH, BECOMING VERY ROUGH BY SOUTHERN LATER. SOUTH-WESTERLY SWELL 3 M.
VIS : POOR UNDER PRECIPITATION.
AMS (30S/40S, 65E/80E)
FRONTAL SHOWERS.
WIND: NORTH-WEST 5 TO 6 AHEAD THE FRONT, BACKING SOUTH TO SOUTH-WEST 5 TO 6
BEHIND. INCREASING 6 TO 7 BY SOUTHERN AREA DURING THE NIGHT, LOCALLY 8
OVER SOUTH-WESTERN AREA.
SEA : MODERATE TO ROUGH, LOCALLY VERY ROUGH OVER SOUTHERN. SOUTHWEST SWELL 2
TO 3 M.
VIS : POOR IN PRECIPITATION.
CRO (40S/50S, 50E/65E)
SHOWERS.
WIND: SETTING-UP SOUTH-WESTERLY 6 TO 7 OVER WESTERN AND 8 TO 9 OVER EASTERN.
VIOLENT GUSTS.
SEA : ROUGH TO HIGH FROM NORTH TO SOUTH, BECOMING VERY HIGH OVER FAR SOUTHERN
LATER. SOUTHWEST SWELL 3 TO 5 M, INCREASING 6 TO 7 M BY SOUTHERN AREA
AT END.
VIS : VERY POOR IN PRECIPITATION.
KER (40S/50S, 65E/80E)
FRONTAL SHOWERS.
WIND: SOUTH-WEST TO WEST 5 TO 6 OVER EASTERN, SETTING-UP WESTERLY TO NORTH-
WEST 7 TO 8 BY SOUTH-WESTERN AT FIRST. DURING THE DAY AND THE NIGHT,
WESTERLY 7 TO 8, LOCALLY 9 OVER WESTERN AREA. VIOLENT GUSTS.
SEA : VERY ROUGH TO HIGH, BECOMING VERY HIGH BY SOUTH-WESTERN LATER.
SOUTHWESTERLY SWELL 3 TO 4 M.
VIS : VERY POOR IN PRECIPITATION.