WEATHER BULLETIN FOR THE HIGH SEAS FOR METAREA VII.
ISSUED BY THE SOUTH AFRICAN WEATHER SERVICE ON THE
12TH OF APRIL 2026 AT 16:30 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 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: W to SW 35 in the south-west, drifting to the south-east towards
mid-period.
2. CAPE WEST: W to NW 35 in the south-west towards mid-period, spreading to
the south-east towards the end of the period, while becoming
SW 35 in the south-west.
3. MARION FORTIES EAST: W to SW 35 to 40 in the south-west, drifting to the
south-east towards mid-period.
SYNOPTIC CHART 12:00Z
=====================
High 1020 hPa 30s03e, High 1017 41s48e
Low 975 hPa 50s15w, Low 986 hPa 49s04e, Low 970 hPa 54s36e
1. Cold front: 34s20w 40s12w 45s09w into 50s15w
2. Cold front: 30s10w 35s01w 40s08e into 49s04e
3. Cold front: 45s27e 50s38e into 54s36e
AREA FORECAST:
==============
ASCENSION (06S/15S, 00E/20W):
WIND : SE to E 10 to 20.
VIS : Good.
ANGOLA (06S/15S, 00E/00N):
WIND : S to SE 05 to 15 reaching 20 in the south at first, but SW 05 to
10 in the east.
VIS : Good, but moderate in showers and thundershowers in the north-
east at times.
ST HELENA (15S/30S, 00E/20W):
WIND : S to SE 05 to 15, but variable 05 to 10 in the south-east until
towards the end of the period.
VIS : Good but moderate in showers and rain in the south and west.
SEA STATE: 3.0m in the south and west at first, reaching 3.5m in the extreme
south-west towards the end of the period, with S to SW swell.
TRADES (15S/30S, 00E/WEST COAST):
WIND : Variable 05 to 10 in the south-west, otherwise S to SE 10 to 20
reaching 25 in the south-east until towards mid-period, but in
the north-east towards the end of the period.
VIS : Good, becoming moderate in showers and rain in the south-west
towards the end of the period.
TRISTAN (30S/40S, 00E/20W):
WIND : W to SW 15 to 25 reaching 30 to 35 in the south-west, drifting to
the south-east towards mid-period. It will become anticyclonic 05
to 15 in the south-west towards the end of the period.
VIS : Good, but moderate in showers and rain in the east and south-
east.
SEA STATE: 3.0 to 5.0m reaching 6.0 to 8.0m in the south, with W to SW
swell.
CAPE WEST (30S/40S, 00E/20E):
WIND : S to SE 05 to 15 in the north-east, otherwise W to NW 15 to 25,
reaching 30 to 35 in the south-west towards mid-period, spreading
to the south-east towards the end of the period, while becoming
SW 25 to 35 in the south-west.
VIS : Good, but moderate to poor in showers and rain in the south and
west.
SEA STATE: 3.0 to 4.0m in the south and west, reaching 5.0 to 7.0m in the
south-west towards the end of the period, with W to SW swell.
CAPE EAST (32.5S/40S, 20E/50E):
WIND : NW 05 to 15 in the north-east, otherwise W to SW 05 to 15
reaching 20 to 25 in the east towards mid-period, while becoming
NE 15 to 25 in the west.
VIS : Good, but moderate to poor in showers and thundershowers in the
eastern parts but in the central parts until mid-period.
SEA STATE: 3.0m in the extreme south-west towards the end of the period,
with SW swell.
DURBAN EAST (32.5S/25S, EAST COAST/55E):
WIND : E to SE 10 to 20 in the north, otherwise anticyclonic 05 to 15
but NE 10 to 20 in the north-west and in the south-west towards
the end of the period.
VIS : Moderate to poor in showers and thundershowers but good in the
central and northern parts.
MOZAMBIQUE CHANNEL:
WIND : S to SE 05 to 15, but NE to E 05 to 15 in the south-west.
VIS : Good, but moderate in showers and thundershowers in places in
the northern parts.
MADAGASCAR EAST (10S/25S, EAST COAST/55E):
WIND : E to SE 10 to 20, but NE 05 to 15 in the south.
VIS : Moderate in showers and thundershowers in places.
MARION FORTIES EAST (40S/50S, 35E/50E):
WIND : W to SW 15 to 25 reaching 30 to 40 in the south-west, drifting to
the south-east towards mid-period. It will become NW 15 to 25 in
the west towards the end of the period.
VIS : Good, but moderate in showers and rain in the east at first, but
in the south-west towards the end of the period.
SEA STATE: 3.0 to 4.0m in the central and southern half, reaching 6.0 to
8.0m in the south, drifting to the extreme south-east towards the
end of the 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)
26/04/12 AT 1600UTC
AVERAGED WIND SPEED ON BEAUFORT SCALE. (WIND GUSTS MAY BE ABOUT 40%
STRONGER THAN THE AVERAGES GIVEN HERE).
PART 1: WARNING
- GALE OR SEVERE CONTINUING OR EXPECTED OVER CRO AND KER.
PART 2: GENERAL SYNOPSIS, 26/04/12 AT 1200UTC
- LOW 988 NEAR 46S/73E, RAPIDLY MOVING EAST-SOUTHEASTWARD AND
DEEPENING.
- LOW 967 SOUTH OF CRO THE 13/04 AT 06UTC, RAPIDLY MOVING EASTWARDS.
- LOW 1009 AT END IN FAR WEST OF WAM, SLOWLY MOVING EASTWARDS AND
FILLING.
- HIGH 1023 NEAR 33S/89E WITH ASSOCIATED RIDGE OVER NORTH OF AMS.
PART 3: FORECAST FOR 24 HOURS FROM 26/04/12 AT 1800UTC TO 26/04/13
AT 1800UTC
WAM (30S/40S, 50E/65E)
RAIN, SHOWERS AND THUNDERSQUALLS.
WIND: MAINLY NORTHWESTERLY 3 TO 5, BECOMING CLOCKWISE IN WEST AT END.
SEA : MODERATE, LOCALLY ROUGH IN SOUTH TILL 13 AT 12 UTC.
VIS : POOR IN PRECIPITATION.
AMS (30S/40S, 65E/80E)
FEW SHOWERS, BECOMING MORE FREQUENT IN FAR SOUTH.
WIND:
- IN NORTH: ANTICLOCKWISE 3 OR 4.
- IN SOUTH: NORTHWEST 5 OR 6, DECREASING 4 OR 5 LATER. GUSTS.
SEA : MODERATE OR ROUGH.
VIS : POOR IN PRECIPITATION.
CRO (40S/50S, 50E/65E)
FRONTAL RAIN OR SHOWERS.
WIND: SOUTHWESTERLY 4 OR 5 BUT LOCALLY VARIABLE 2 TO 4 IN ORTH,
RAPIDLY INCREASING NORTHWEST 7 OR 8 IN SOUTH, AT TIMES 9, BACKING
WEST LATER. SEVERE GUSTS.
SEA : MODERATE OR ROUGH, INCREASING SOON VERY ROUGH OR HIGH IN SOUTH.
VIS : POOR OR VERY POOR IN PRECIPITATION.
KER (40S/50S, 65E/80E)
FRONTAL RAIN OR SHOWERS.
WIND: CLOCKWISE 7 OR 8 IN EAST, AT TIMES 9, RAPIDLY DECREASING
SOUTHWEST 5 OR 6, INCREASING NORTHWEST 6 OR 7 IN SOUTH LATER, AT
TIMES 8, AND BECOMING LOCALLY VARIABLE 2 TO 4 IN NORTH. SEVERE GUSTS.
SEA : ROUGH OR VERY ROUGH, LOCALLY HIGH IN EAST AT FIRST, DECREASING
MODERATE OR ROUGH IN NORTH LATER.
VIS : POOR OR VERY POOR IN PRECIPITATION.