WEATHER BULLETIN FOR THE HIGH SEAS FOR METAREA VII.
ISSUED BY THE SOUTH AFRICAN WEATHER SERVICE ON THE
15th 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 151000 TO 161000 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. CAPE WEST: W to NW 35 in the south-west, drifting to the south-east
from mid-period.
2. DURBAN EAST: Cyclonic 35 in the central parts until mid-period.
3. MARION FORTIES EAST: W to NW 35 in the south-west, drifting to the
south-east by mid-period.
SYNOPTIC CHART 06:00Z
=====================
High 1032 hPa 39s47e.
Low 960 hPa 55s03w, Low 988 hPa 51s27e.
1. Cold Front: 26s19w 36s00e 47s11e 61s01e into 55s04w.
2. Cold Front: 36s32e 42s36e 47s38e 57s31e into 51s27e.
AREA FORECAST:
==============
ASCENSION (06S/15S, 00E/20W):
WIND : E to SE 05 to 15.
VIS : Good.
ANGOLA (06S/15S, 00E/00N):
WIND : S to SE 05 to 15 but variable 05 to 10 in the east.
VIS : Good.
ST HELENA (15S/30S, 00E/20W):
WIND : NW 15 to 25 in the south-east and central parts, otherwise
Anticyclonic 05 to 15.
VIS : Good in the extreme north, otherwise moderate in showers
and rain.
SEA STATE: 3.0 to 4.0m reaching 4.5m in the south until mid-period, with
S to SW swell.
TRADES (15S/30S, 00E/WEST COAST):
WIND : S to SE 05 to 15 in the north-east otherwise Anticyclonic 05
to 15 but W to NW 15 to 25 in the south-west.
VIS : Good.
SEA STATE: 3.0 to 3.5m in the extreme south-west, with SW swell.
TRISTAN (30S/40S, 00E/20W):
WIND : W to SW 15 to 25 reaching 30 in places becoming cyclonic 15 to
25 in the north-west by the end of the period.
VIS : Moderate to poor in showers and thundershowers in places.
SEA STATE: 4.0 to 5.0m subsiding to 3.0 to 3.5m from mid-period, with W
to SW swell.
CAPE WEST (30S/40S, 00E/20E):
WIND : Variable 05 in the north-east, otherwise W to NW 15 to 25
reaching 30 to 35 in the south-west, drifting to the south-
east from mid-period.
VIS : Good but moderate in rain and showers in the west, spreading
to the south-east from mid-period.
SEA STATE: 3.0 to 4.0m except in the north-east, reaching 5.0 to 6.0m in
the south-west, with W to SW swell.
CAPE EAST (32.5S/40S, 20E/50E):
WIND : Variable 05 to 10 in the west at first but N to NE 10 to 20 in
the central parts, spreading to the west towards mid-period
reaching 25, otherwise Anticyclonic 05 to 15 becoming NW 15 to
25 in the extreme west towards the end of the period.
VIS : Good.
SEA STATE: 3.0 to 3.5m except in the central parts, with W to SW swell.
DURBAN EAST (32.5S/25S, EAST COAST/55E):
WIND : E to NE 10 to 20 but cyclonic 20 to 30 in the central parts
reaching 35 until mid-period.
VIS : Good but moderate in showers and thundershowers in the north-
east and the central northern parts.
SEA STATE: 3.0 to 3.5m reaching 4.5 to 5.5m in the central parts, with E
to SE swell but NE swell in the extreme south-west.
MOZAMBIQUE CHANNEL:
WIND : S to SW 15 to 25, but variable 05 to 10 in the south-east.
VIS : Good but moderate in showers and rain in places.
MADAGASCAR EAST (10S/25S, EAST COAST/55E):
WIND : E to SE 10 to 20, but NE 15 to 25 in the north.
VIS : Good, but moderate to poor in showers and thundershowers in
the south.
SEA STATE: 3.0 to 3.5m in the south, with SE swell.
MARION FORTIES EAST (40S/50S, 35E/50E):
WIND : W to NW 15 to 25 reaching 30 in places but 35 in the south-
west, drifting to the south-east by mid-period.
VIS : Good, but moderate in showers and rain in the west spreading
to the east until mid-period.
SEA STATE: 3.0 to 4.0m, except in the north from mid-period, reaching
4.5m in the south, with W to NW swell.
AREA 2:
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MARINE METEOROLOGICAL BULLETIN FROM METEO-FRANCE/LA REUNION ON AREA ACK (AMSTERDAM-CROZET-KERGUELEN)
2026/08/15 AT 0500UTC
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 AMS AND KER.- GALE FORCE 8 OVER CRO.
PART 2: GENERAL SYNOPSIS, 26/08/15 AT 0000UTC
- HIGH 1034 HPA NEAR 40S/46E WITH A RIDGE EXTENDING NORTH-EASTWARD.
PART 3: FORECAST FOR 24 HOURS FROM 26/08/15 AT 0600UTC TO 26/08/16 AT 0600UTC
WAM (30S/40S, 50E/65E)
SCATTERED SHOWERS.
WIND: S TO SW 5 TO 6 BECOMING ANTICLOCKWISE 3 TO 4 OVER THE WHOLE AREA.
SEA : ROUGH TO VERY ROUGH LOCALLY HIGH OVER SOUTH-EASTERN AREA BECOMING MODERATE TO ROUGH. LONG SSW SWELL 2 TO 4 METERS ABATING.
VIS : GOOD.
AMS (30S/40S, 65E/80E)
SHOWERS OVER SOUTH-EASTERN AREA THEN SCATTERED SHOWERS.
WIND: SW 6 TO 7 INCREASING 7 TO 8 AND REACHING 9 LOCALLY OVER SOUTH-EASTERN
AREA.
SEA : BECOMING ROUGH TO HIGH. LONG SSW SWELL 5 TO 6 METERS.
VIS : POOR IN PRECIPITATION.
CRO (40S/50S, 50E/65E)
SCATTERED SHOWERS, FOLLOWED BY RAIN AND FRONTAL SHOWERS OVER THE SOUTHERN PART OF THE REGION AS A NEW FRONT MOVES OVERNIGHT.
WIND: SOUTH-WESTERLY 5 TO 7, INCREASING NORTH-WESTERLY 7/8 AHEAD OF A NEW
FRONT; BACKING WESTERLY 6/7 BEHIND THE FRONTAT THE END OF THE FORECAST
PERIOD.
SEA : ROUGH TO VERY ROUGH, BECOMING MODERATE TO ROUGH.LONG SWELLS FROM THE
SOUTH-WEST, 4 TO 6 METRES, GRADUALLY ABATING.
VIS : POOR DURING RAINFALL.
KER (40S/50S, 65E/80E)
FREQUENT SHOWERS OVER NORTHERN, THEN SCATTERED SHOWERS BECOMING MORE FREQUENT OVER FAR SOUTHERN TOWARDS THE END OF THE FORECAST PERIOD.
WIND : SOUTH-WESTERLY 7/8, FRESHENING TO 8/9 WITH STRONG GUSTS, EASING TO
EASTERLY 6 TO 8 DURING THE NIGHT.
SEA : VERY ROUGH TO ROUGH, LOCALLY STRONG. LONG SWELLS FROM THE SOUTH-WEST,
4 TO 6 METRES, SUBSIDING TOWARDS THE END OF THE FORECAST PERIOD.
VIS : VERY POOR DURING RAINFALL.=