WEATHER BULLETIN FOR THE HIGH SEAS FOR METAREA VII.
ISSUED BY THE SOUTH AFRICAN WEATHER SERVICE ON THE
16th 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 161000 TO 171000 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 SW 35 over the south-west, spreading to the south-east by
mid-period.
2. MARION FORTIES EAST: NW 35 over the central and south-eastern parts.
SYNOPTIC CHART 06:00Z
=====================
High 1028 hPa 37s40w, High 1032 hPa 35s50e.
Low 31s19w 1016 hPa, Low 994 hPa 48s21e, Low 964 hPa 56s70e.
1. Cold Front: 24s32w 27s21w into 31s19w.
2. Cold Front: 28s07w 33s09e 39s19e 44s28e into 48s21e.
3. Cold Front: 41s41e 45s66e 50s68e into 56s70e.
AREA FORECAST:
==============
ASCENSION (06S/15S, 00E/20W):
WIND : E to SE 10 to 15.
VIS : Good.
SEA STATE: 3.0m over the southern half, with SW swell.
ANGOLA (06S/15S, 00E/00N):
WIND : S to SE 05 to 15 but SW 05 to 10 in the east.
VIS : Good.
ST HELENA (15S/30S, 00E/20W):
WIND : SE 10 to 20 in the extreme north-east and south-west, with NW 10
to 15 extending from the north-west across to the eastern parts.
VIS : Good in the north and north-east, otherwise moderate in showers
and thundershowers.
SEA STATE: 3.0 to 3.5m, with S to SW swell.
TRADES (15S/30S, 00E/WEST COAST):
WIND : S to SE 10 to 15.
VIS : Good, but moderate in showers in the extreme south-west.
SEA STATE: 3.0 to 3.5m, except in the north-east, with SW swell.
TRISTAN (30S/40S, 00E/20W):
WIND : SE 10 to 20 in the extreme north-west, otherwise W to SW 15 to 25,
reaching 30 to 35 over the south-west, spreading to the south-east
by mid-period.
VIS : Moderate in showers and thundershowers in places.
SEA STATE: 3.0 to 4.0m, reaching 4.5 to 5.5m in the south-west, spreading to
the south-east by mid-period, with W to SW swell.
CAPE WEST (30S/40S, 00E/20E):
WIND : W to NW 10 to 20, reaching 25 to 30 in the south-east until mid-
period and in the south-west towards mid-period.
VIS : Good in the north-east but moderate in rain and showers in
places.
SEA STATE: 3.0 to 3.5m, reaching 4.0 to 4.5 m in the south and increasing to
5.5 to 6.0m during the second half of the period, with W to SW
swell.
CAPE EAST (32.5S/40S, 20E/50E):
WIND : N to NW 15 to 25 but NE 10 to 15 in the north-east.
VIS : Good, but moderate in rain and showers in the south-west.
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 NW swell, but NE swell in
the north-west.
DURBAN EAST (32.5S/25S, EAST COAST/55E):
WIND : E to NE 15 to 25 but SE 10 to 15 in the north-west.
VIS : Good in the extreme west and south otherwise moderate to poor in
showers and thundershowers.
SEA STATE: 3.0 to 3.5m, except in the west and north-west, with e to NE
swell.
MOZAMBIQUE CHANNEL:
WIND : S to SW 10 to 20.
VIS : Good but moderate in showers in places.
SEA STATE: 3.0m in the south at first, with SE swell.
MADAGASCAR EAST (10S/25S, EAST COAST/55E):
WIND : E to SE 10 to 20, but NE 10 to 15 in the south-west.
VIS : Moderate to poor in showers and thundershowers.
SEA STATE: 3.0m in the south-east, with SW swell.
MARION FORTIES EAST (40S/50S, 35E/50E):
WIND : W to SW 10 to 15 in the south-east at first, otherwise NW 20 to
30, reaching 35 over the central and south-eastern parts. It will
become SW 10 to 20 in the south-west during the second half of the
period.
VIS : Good, but moderate in showers and rain in the west and south-west,
spreading to the entire region during the second half of the
period.
SEA STATE: 3.0 to 4.0m, except in the north-east, 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)
26/08/16 AT 0400UTC
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 KER.- GALE FORCE 8 OVER WAM AND CRO.
PART 2: GENERAL SYNOPSIS, 26/08/16 AT 0000UTC
- NEW DISTURBANCES OVER CRO THEN KER WITH STRONG WESTERLY FLOW
PREVAILING.- HIGH 1032 OVER WEST OF WAM, LITTLE CHANGE.
PART 3: FORECAST FOR 24 HOURS FROM 26/08/16 AT 0600UTC TO 26/08/17 AT 0600UTC
WAM (30S/40S, 50E/65E)
SCATTERED SHOWERS.
WIND: ANTICLOCKWISE 3 TO 5, BUT SOUTH-WEST 5 OR 6 IN FAR SOUTHEASTERN, AT
TIMES 7 LATER WITH GUSTS.
SEA : ROUGH OR VERY ROUGH IN LONG SSW SWELL 3 TO 5 M FROM WEST TO EAST,
DECREASING SLOWLY.
VIS: MODERATE IN PRECIPITATION.
AMS (30S/40S, 65E/80E)
SCATTERED SHOWERS IN SOUTH.
WIND: ANTICLOCKWISE 3 TO 5 IN NORTH, INCREASING WESTERLY 6 OR 7 IN SOUTH, AT
TIMES 8 LATER. SEVERE GUSTS.
SEA : VERY ROUGH OR HIGH. LONG SSW SWELL 4 TO 6 M.
VIS : POOR IN PRECIPITATION.
CRO (40S/50S, 50E/65E)
FRONTAL RAIN OR SHOWERS.
WIND: WESTERLY TO SOUTH-WEST 6 OR 7, AT TIMES 8 OVER EASTERN, DECREASING 5 OR
6 IN WEST DURING THE NIGHT, THEN SETTING-UP NORTH-WEST 6 TO 7 AT END BY
SOUTH-WESTERN. SEVERE GUSTS.
SEA : ROUGH OR VERY ROUGH, LOCALLY HIGH IN EASTERN. LONG SSW SWELL 4 OR 5 M
IN EAST, ABATING.
VIS : POOR OR VERY POOR IN PRECIPITATION.
KER (40S/50S, 65E/80E)
SHOWERS.
WIND: WESTERLY TO SOUTH-WEST 7 OR 8, INCREASING LOCALLY 9 OVER FAR SOUTHERN
THEN SOUTH-EASTERN PART SOON. SEVERE GUSTS.
SEA : VERY ROUGH OR HIGH. LONG SW SWELL 3 TO 5 M.
VIS : POOR OR VERY POOR IN PRECIPITATION.