WEATHER BULLETIN FOR THE HIGH SEAS FOR METAREA VII.
ISSUED BY THE SOUTH AFRICAN WEATHER SERVICE ON THE
15th OF AUGUST 2026 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 152200 TO 162200 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: NW 35 in the south-west from mid-period, drifting to the
south-east by the end of the period.
2. CAPE WEST: W to NW 35 in the south-east, spreading to the south-west
towards the end of the period.
3. MARION FORTIES EAST: SW 35 in the east at first but W to NW 35 in the
west towards the end of the period.
SYNOPTIC CHART 12:00Z
=====================
High 1032 hPa 39s48e.
Low 980 hPa 58s21w, Low 960 hPa 55s02w, Low 990 hPa 54s32e.
1. Cold Front: 28s11w 33s00e 45s12e 53s20e 63s00e into 55s02w.
2. Cold Front: 40s31e 45s40e 50s42e 55s41e 58s34e 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 : Cyclonic 20 to 30 in the central western parts, otherwise
Anticyclonic 05 to 15.
VIS : Good in the extreme north, otherwise moderate in showers
and rain.
SEA STATE: 3.0 to 3.5m, with S to SW swell.
TRADES (15S/30S, 00E/WEST COAST):
WIND : S to SE 05 to 15 but Anticyclonic 05 to 15 in the south.
VIS : Good, but moderate in showers in the extreme south-west.
SEA STATE: 3.0 to 3.5m in the south, with SW swell.
TRISTAN (30S/40S, 00E/20W):
WIND : Cyclonic 15 to 25 in the north-west by mid-period, otherwise
W to SW 15 to 25 reaching 30 in places becoming NW 25 to 35 in
the south-west from mid-period, drifting to the south-east by
the end of the period.
VIS : Moderate in showers and thundershowers in places.
SEA STATE: 3.0 to 3.5m reaching 4.0 to 4.5m in the east and south-east,
with W to SW swell.
CAPE WEST (30S/40S, 00E/20E):
WIND : Variable 05 to 10 in places in the north, otherwise W to NW 15
to 25 reaching 30 to 35 in the south-east, spreading to the
south-west towards the end of the period.
VIS : Good in the north-east but moderate in rain and showers in
places.
SEA STATE: 3.0 to 4.0m except in the north-east, reaching 5.0m in the
south, with W to SW swell.
CAPE EAST (32.5S/40S, 20E/50E):
WIND : N to NW 10 to 20 in the west reaching 25, otherwise
Anticyclonic 05 to 15.
VIS : Good, but moderate in rain and showers in the south-west from
mid-period.
SEA STATE: 3.0 to 3.5m except in the east, reaching 4.0 to 4.5m in the
south-west from mid-period, with W to SW swell but SE swell in
the central parts.
DURBAN EAST (32.5S/25S, EAST COAST/55E):
WIND : E to NE 10 to 20 but cyclonic 20 to 30 in the central parts.
VIS : Good in the extreme west and south otherwise moderate in
showers and thundershowers in places.
SEA STATE: 3.0 to 3.5m in the central parts, with E to SE swell but NE
swell in the extreme south-west.
MOZAMBIQUE CHANNEL:
WIND : S to SW 10 to 20, but cyclonic 05 to 15 in the south-east.
VIS : Good but moderate in showers in places.
MADAGASCAR EAST (10S/25S, EAST COAST/55E):
WIND : E to SE 10 to 20, but NE 10 to 20 in the north.
VIS : Good, but moderate to poor in showers and thundershowers in
the south and west.
SEA STATE: 3.0m in the south-east, with SW swell.
MARION FORTIES EAST (40S/50S, 35E/50E):
WIND : SW 25 to 35 in the east at first, otherwise W to NW 15 to 25
reaching 30 in places but 35 in the west towards the end of
the period.
VIS : Good, but moderate in showers and rain in the east at first
and in the west towards the end of the period.
SEA STATE: 3.0 to 4.0m, except in the north, reaching 4.5 to 5.0m until
mid-period, 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.=