WEATHER BULLETIN FOR THE HIGH SEAS FOR METAREA VII.
ISSUED BY THE SOUTH AFRICAN WEATHER SERVICE ON THE
31ST OF JULY 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 312200 TO 012200 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. ST HELENA: SW 35 in the south-west towards mid-period.
2. TRISTAN : Cyclonic 35 in the west from the morning, spreading to the
north from mid-period, while moderating in the west.
3. CAPE EAST: E to NE 35 in the west at times, but S to SE 35 to
40 in places in the central, east and northern parts,
moderating in the east from mid-period.
4. DURBAN EAST: Cyclonic 35 to 40 in places in the west and southern parts
at times.
5. MOZAMBIQUE CHANNEL: S to SW 35 in the south-west at first and towards
the end of the period.
6. MARION FORTIES EAST: W to NW 35 in the southern parts, moderating in the
south-west towards the end of the period.
SYNOPTIC CHART 12:00Z
=====================
High 1041 hPa 47s47e.
Low 992 hPa 41s09w, Low 1013 hPa 28s43e.
1. Cold front: 20s35w 26s24w 32s15w 36s10w into 41s09w.
AREA FORECAST:
==============
ASCENSION (06S/15S, 00E/20W):
WIND : E to SE 10 to 20.
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 : Variable 05 to 10 in the north, otherwise W to NW 15 to 25,
becoming SW 15 to 25 in the south-west from the morning, reaching
30 to 35 towards mid-period.
VIS : Good, but moderate to poor in showers and thundershowers in
the south-west, spreading to the south and west from the morning,
while clearing in the south-west.
SEA STATE: 3.0 to 4.0m in the south and south-west, reaching 4.5 to 5.0m in
the south-west towards mid-period, with SW swell.
TRADES (15S/30S, 00E/WEST COAST):
WIND : Variable 05 to 10 in the south-west, otherwise S to SE 05 to 15.
VIS : Good.
TRISTAN (30S/40S, 00E/20W):
WIND : N to NW 15 to 25 in the east, but cyclonic 15 to 25 in the west,
reaching 30 to 35 from the morning, spreading to the north from
mid-period, while moderating in the west, otherwise S to SW 15 to
25.
VIS : Moderate to poor in showers and thundershowers in places, clearing
in the south from the morning, as well as west from the afternoon.
SEA STATE: 3.0 to 4.0m except in the north-east, reaching 5.0 to 6.0m in the
west, south and south-east, with W to SW swell.
CAPE WEST (30S/40S, 00E/20E):
WIND : E to NE 15 to 25 in the east, but anti-cyclonic 05 to 15 in the
central and northern parts, otherwise N to NW 15 to 25, reaching
30 in the south-west at times.
VIS : Good, but moderate in showers and rain in the south-west.
SEA STATE: 3.0 to 4.0m in the east and south-west, with W to NW swell in the
south-west, but E to NE in the east.
CAPE EAST (32.5S/40S, 20E/50E):
WIND : Variable 05 to 10 in the south, but E to NE 15 to 25 in the west,
reaching 30 to 35 at times, otherwise S to SE 15 to 25, reaching
30 to 40 in places in the central, east and northern parts,
moderating in the east from mid-period.
VIS : Good but moderate to poor in showers and rain in the central,
north and eastern parts.
SEA STATE: 3.0 to 4.0m, reaching 5.0 to 6.0m over the north, central and
eastern parts, with S to SW swell.
DURBAN EAST (32.5S/25S, EAST COAST/55E):
WIND : E to NE 10 to 20 in the east, reaching 25 to 30 in the south-east,
otherwise cyclonic 15 to 25, reaching 30 to 40 in places in the
west and southern parts at times.
VIS : Moderate to poor in showers and thundershowers in places.
SEA STATE: 3.0m to 4.0m in the west and southern parts, spreading to the
south-east from the morning, reaching 4.5 to 5.5m in the south and
west, with S to SW swell.
MOZAMBIQUE CHANNEL:
WIND : S to SW 15 to 25 reaching 30 to 35 in the south-west at first and
towards the end of the period.
VIS : Good, but moderate in showers and rain in the south and central
parts, clearing in the central from mid-period.
SEA STATE: 3.0 to 4.0m in the central and southern half, reaching 4.5 to
5.0m in the south, with S to SW swell.
MADAGASCAR EAST (10S/25S, EAST COAST/55E):
WIND : N to NE 10 to 20 in the south, otherwise E to SE 05 to 15.
VIS : Moderate to poor in showers and thundershowers in the southern
parts, otherwise moderate in showers and rain.
MARION FORTIES EAST (40S/50S, 35E/50E):
WIND : E to NE 15 to 25 in the northern parts, becoming anti-cyclonic 05
to 15 from mid-period, otherwise W to NW 15 to 25, reaching 30 to
35 in the southern parts, moderating in the south-west towards the
end of the period.
VIS : Good but moderate to poor in showers and rain in the south-
west, spreading to the south-east from the morning.
SEA STATE: 3.0 to 4.0m reaching 5.0 to 6.0m in the south, 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)
26/07/31 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 SOUTHERN CRO AREA AND SOUTHERN KER AREA.
PART 2: GENERAL SYNOPSIS, 26/07/31 AT 0000UTC
- THUNDERY LOW 1015 NEAR 30S/39E, LITTLE CHANGE.
- COLD FRONT AXIS 44S/54E, 50S64E, 55S/75E, MOVING EASTWARDS.
- HIGH 1031 NEAR 37S/74E, SLOWLY MOVING EASTWARDS.
- HIGH 1038 NEAR 49S/40E, MOVING EASTWARDS, EXPECTED SOON OVER CRO.
PART 3: FORECAST FOR 24 HOURS FROM 26/07/31 AT 0600UTC TO 26/08/01 AT 0600UTC
WAM (30S/40S, 50E/65E)
RAIN OR SHOWERS, AT TIMES THUNDERY IN NORTHWEST.
WIND: NORTHEAST 4 OR 5, INCREASING SOUTHEAST 5 OR 6 IN SOUTH, AT TIMES 7.
GUSTS.
SEA : ROUGH, BECOMING LOCALLY VERY ROUGH IN SOUTH.
VIS : POOR IN PRECIPITATION.
AMS (30S/40S, 65E/80E)
RAIN OR SHOWERS.
WIND : ANTICLOCKWISE 3 TO 5, MAINLY WEST IN SOUTH, INCREASING SOUTH 5 OR 6,
AT TIMES 7, IN FAR SOUTH LATER BEHIND THE FRONT.
SEA : ROUGH IN SW SWELL, BECOMING LOCALLY VERY ROUGH AND CROSSED IN SOUTH.
VIS : POOR IN PRECIPITATION.
CRO (40S/50S, 50E/65E)
RAIN OR SHOWERS.
WIND : SOUTHERLY 7 OR 8, OCCASIONALLY 9 IN SOUTH, DECREASING ANTICLOCKWISE 4
OR 5 FROM WEST SOON, INCREASING NORTHWEST 7 OR 8 IN SOUTH AT END.
SEVERE GUSTS.
SEA : BECOMING VERY ROUGH OR HIGH, OCCASIONALLY VERY HIGH IN SOUTH. LONG SW
SWELL INCREASING 7 OR 8 M IN SOUTH.
VIS : POOR IN PRECIPITATION.
KER (40S/50S, 65E/80E)
RAIN OR SHOWERS.
WIND : WEST 6 OR 7, INCREASING SOUTHWEST 7 OR 8, AT TIMES 9 IN SOUTH, BEHIND
THE FRONT, DECREASING 5 OR 6 IN NORTHWEST AT END. SEVERE GUSTS.
SEA : VERY ROUGH, BECOMING HIGH OR VERY HIGH. LONG SW SWELL INCREASING 7 OR
8 M FROM SOUTHWEST LATER.
VIS : POOR IN PRECIPITATION.