WEATHER BULLETIN FOR THE HIGH SEAS FOR METAREA VII.
ISSUED BY THE SOUTH AFRICAN WEATHER SERVICE ON THE
12TH OF AUGUST 2026 AT 17:00 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 122200 TO 132200 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 to 40 in the south-west towards end of period.
2. CAPE WEST: E to NE 35 in the south-east.
3. DURBAN EAST: SE to E 35 to 40 in the north from mid-period.
4.MARION FORTIES EAST: W to SW 35 in the south-east at first.
SYNOPTIC CHART 12:00Z
=====================
High 1044 hPa 41s28e.
Low 1015 27s11e, Low 967 hPa 57s01e.
Cold Front: 27s10w 34s06w 41s02w 47s02e 54s07e into 57s01e.
AREA FORECAST:
==============
ASCENSION (06S/15S, 00E/20W):
WIND : E to SE 05 to 15.
VIS : Good.
SEA STATE: 3.0 m in the southwest from mid-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 at first, 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 by mid-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 NW to N 10 to 20 in the south-west
spreading to the south-east towards mid-period while becoming
SE 05 to 15 in the north-east.
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 becoming SW 25 to 35 over the western parts
spreading to the central parts by mid-period and NW 20 to 30
in the west reaching 30 to 40 in the south-west towards end of
period.
VIS : Good but moderate to poor in showers and thundershowers in
far eastern and western parts, spreading eastwards while
clearing from the west it will become moderate in rain in the
south-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 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
mid-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
in the far west but 35 in the extreme south-west at first.
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 but 35 to
40 from mid-period.
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 where
it will reach 6.0m by end of period, 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 by mid-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 where it
will become NE 05 to 15 by end of period.
VIS : Good, but moderate in showers and thundershowers in the south
and extreme north.
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 : Anticyclonic 05 to 15 in the north-west, otherwise W to SW 15
to 25 reaching 30 to 35 in the south-east at first.
VIS : Good.
SEA STATE: 3.0 to 4.0m reaching 5.0 to 6.0m in the southern parts but 6.5
to 7.5 in the south-east and 8.0 to 9.0 m in the extreme
south-east by mid-period, with W to SW swell.
AREA 2:
=======
MARINE METEOROLOGICAL BULLETIN FROM METEO-FRANCE/LA REUNION ON AREA
ACK (AMSTERDAM-CROZET-KERGUELEN)
26/08/12 AT 1600UTC
AVERAGED WIND SPEED ON BEAUFORT SCALE. (WIND GUSTS MAY BE ABOUT 40%
STRONGER THAN THE AVERAGES GIVEN HERE).
PART 1: WARNING
- GALE TO LOCALLY SEVERE GALE CONTINUING OR EXPECTED OVER AMS, CRO
AND KER.
PART 2: GENERAL SYNOPSIS, 26/08/12 AT 1200UTC
- LOW 953 NEAR 52S/69E, RAPIDLY MOVING EASTWARDS, WITH ASSOCIATED
STRONG OR VERY STRONG SOUTHWESTERLY FLOW OVER SOUTH OF BASIN BEHIND
DISTURBANCES.
- HIGH 1042 NEAR 42S/35E, SLOW-MOVING.
PART 3: FORECAST FOR 24 HOURS FROM 26/08/12 AT 1800UTC TO 26/08/13
AT 1800UTC
WAM (30S/40S, 50E/65E)
FRONTAL RAIN OR SHOWERS.WIND: SOUTHERLY 5 OR 6, INCREASING AT TIMES 7
IN SOUTHEAST, BUT NORTHWEST 4 OR 5 AT FIRST IN FAR NORTHEAST.
GUSTS.SEA: ROUGH, BECOMING VERY ROUGH OR HIGH IN SOUTH. LONG SSW
SWELL INCREASING 5 M IN SOUTH AT END.VISI: POOR IN PRECIPITATION.
AMS (30S/40S, 65E/80E)
FRONTAL RAIN OR SHOWERS.WIND: NORTHWEST 5 OR 6, INCREASING
SOUTHWESTERLY 6 OR 7, AT TIMES 8 IN SOUTH. SEVERE GUSTS.SEA: MODERATE
OR ROUGH, BECOMING VERY ROUGH OR HIGH. LONG SSW SWELL INCREASING 5 M
IN SOUTH AT END. VISI: POOR IN PRECIPITATION.
CRO (40S/50S, 50E/65E)
FRONTAL RAIN OR SHOWERS.WIND: SOUTHWEST 7 OR 8, AT TIMES 9 TILL 13 AT
06 UTC. SEVERE GUSTS. SEA: VERY ROUGH OR HIGH, AT TIMES VERY HIGH IN
SOUTH. LONG SW SWELL INCREASING 7 OR 8 M IN SOUTH. VISI: POOR IN
PRECIPITATION.
KER (40S/50S, 65E/80E)
FRONTAL RAIN OR SHOWERS.WIND: WESTERLY 7 OR 8, AT TIMES 9 TILL 13 AT
06 UTC. SEVERE GUSTS.SEA: HIGH. LONG SW SWELL INCREASING 5 OR 6
LATER. VISI: POOR IN PRECIPITATION.