WEATHER BULLETIN FOR THE HIGH SEAS FOR METAREA VII.
ISSUED BY THE SOUTH AFRICAN WEATHER SERVICE ON THE
30TH OF AUGUST 2025 AT 17:30 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 302200 to 312200 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 NW 35 in the south-west towards mid-period, spreading
to the south by the end of the period.
2. CAPE WEST: W to NW 35 in the extreme south-east at first.
3. CAPE EAST: NW 35 in the south-west at first, but W to SW 35 to 45 in
the south-east at first.
4. MARION FORTIES EAST: Cyclonic 35 to 40 in the north-east at first,
but W to NW 35 to 40 in the west and south-
west, spreading to the south-east from the
afternoon.
SYNOPTIC CHART 12:00Z
=====================
High 1028 hPa 35s30w, High 1028 hPa 30s60e
Low 965 hPa 54s19e, Low 1004 hPa 42s40e
1. Cold Front: 33s02w 39s04e 44s12e 46s17e 51s22e into 54s19e
2. Cold Front: 35s37e 43s42e into 42s40e
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 10 to 20, but SW 05 to 15 in the east.
VIS : Good.
ST HELENA (15S/30S, 00E/20W):
WIND : E to SE 10 to 20, but variable 05 to 10 in the south-east.
VIS : Good, but moderate in showers and rain in the south and
south-western parts.
SEA STATE: 3.0m in the south, with 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 to 30 in the north-east and south-east.
VIS : Good.
SEA STATE: 3.0m in the north-east, as well as south-east and southern
parts from mid-period, with SW swell.
TRISTAN (30S/40S, 00E/20W):
WIND : Anti-cyclonic 05 to 15 in the northern parts until in the
afternoon, otherwise W to NW 20 to 30, reaching 35 in the
south-west towards mid-period, spreading to the south by the
end of the period.
VIS : Good, but moderate in rain and showers in the south, spreading
to the west and south-west from mid-period, as well as in the
central by the end of the period.
SEA STATE: 3.0 to 4.0m, reaching 5.0 to 6.0m in the southern parts, with
SW swell.
CAPE WEST (30S/40S, 00E/20E):
WIND : Anti-cyclonic 05 to 15 in the north-west, spreading to the
east from the morning, otherwise W to NW 20 to 30, reaching
to 35 in the extreme south-east at first.
VIS : Good, but moderate in showers and rain in the south-east at
first.
SEA STATE: 3.0 to 4.0m, except in the north-east until in the evening,
reaching 4.5 to 5.5m in the southern parts, with SW swell.
CAPE EAST (32.5S/40S, 20E/50E):
WIND : Anti-cyclonic 05 to 15 in the central at first, spreading to
the east from mid-period, but NW 15 to 25 in the south-west
reaching 30 to 35 at first, otherwise W to SW 15 to 25,
reaching 35 to 45 in the south-east at first.
VIS : Good, but moderate in showers and rain in the east at first,
as well as south-west, spreading to the south from the
afternoon.
SEA STATE: 3.0 to 3.5m, reaching 4.0 to 5.0m in the south and south-west,
but 6.0 to 7.0m in the south-east until mid-period, with SW
swell.
DURBAN EAST (32.5S/25S, EAST COAST/55E):
WIND : N to NE 05 to 15, reaching 25 to 30 in the north, as well as
in the extreme south-west in the morning, becoming SW 20 to 30
in the extreme south-west from the afternoon.
VIS : Good.
SEA STATE: 3.0m in places in the southern parts, with SW swell.
MOZAMBIQUE CHANNEL:
WIND : N to NE 05 to 15 in the south-west from mid-period, otherwise
S to SE 05 to 15 reaching 20 to 25 in the north-east.
VIS : Good.
MADAGASCAR EAST (10S/25S, EAST COAST/55E):
WIND : S to SE 10 to 20 reaching 25 to 30 in the north, but E to NE
10 to 20 in the south.
VIS : Good, but moderate in showers and rain in places in the west
and north.
SEA STATE: 3.0m in the north, with SE swell.
MARION FORTIES EAST (40S/50S, 35E/50E):
WIND : Cyclonic 35 to 40 in the north-east at first, otherwise W to
NW 15 to 25, reaching 30 to 40 in the west and south-west,
spreading to the south-east from the afternoon. It will become
SW 20 to 30 in the west from the evening.
VIS : Good, but moderate to poor in rain and snow-showers in the
north-east at first, as well as south-west from the morning,
spreading to the north-west and southern parts from mid-
period.
SEA STATE: 3.0 to 4.0m, reaching 5.0 to 6.0m in the north-east at first,
and in the southern parts, spreading to the west and central
parts from mid-period, with W to SW swell but NW in the west.
AREA 2:
=======
MARINE METEOROLOGICAL BULLETIN FROM METEO-FRANCE/LA REUNION ON AREA
ACK (AMSTERDAM-CROZET-KERGUELEN)
25/08/30 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 LOCALLY SEVER GALE CONTINUING OR EXPECTED OVER ALL AREAS.
PART 2: GENERAL SYNOPSIS, 25/08/30 AT 1200UTC
- THUNDERY LOW 1003 NEAR 42S/40E, MOVING RATHER QUICKLY EASTWARDS.
EXPECTED 1003 NEAR 42S/59E THE 31 AT 06 UTC, THEN 1002 NEAR 42S/71E
THE 31 AT 18 UTC.
- COLD FRONT AXIS 38S/53E, 40S/65E, 41S/73E, 43S/81E, MOVING RATHER
QUICKLY EASTWARDS.
- NEW COLD FRONT EXPECTED AT END JUST WEST OF CRO.
- HIGH BELT 1025 IN FAR NORTH AND FAR SOUTH OF WAM AND AMS, LITTLE
CHANGE.
PART 3: FORECAST FOR 24 HOURS FROM 25/08/30 AT 1800UTC TO 25/08/31
AT 1800UTC
WAM (30S/40S, 50E/65E)
FRONTAL RAIN OR SHOWERS, AT TIMES THUNDERY.
WIND:
- IN FAR NORTH : ANTICLOCKWISE 3 TO 5.
- ELSEWHERE : NORTHWEST INCREASING 7 OR 8, BACKING SOON SOUTHWEST
FROM WEST. SEVERE GUSTS.
SEA : MODERATE OR ROUGH, BECOMING VERY ROUGH OR HIGH AND CROSSED IN
NORTH. LONG SW SWELL 4 OR 5 M LATER.
VIS : POOR OR VERY POOR IN PRECIPITATION.
AMS (30S/40S, 65E/80E)
FRONTAL RAIN OR SHOWERS.
WIND:
- IN FAR NORTH: ANTICLOCKWISE 3 TO 5.
- ELSEWHERE: NORTHWEST 5 OR 6, BECOMING TEMPORARILY VARIABLE 3 OR 4
BEHIND THE FRONT, INCREASING NORTHWEST 7 OR 8 LATER IN WEST.
SEVERE GUSTS.
SEA : MODERATE OR ROUGH, BUT ROUGH OR VERY ROUGH AND CROSSED IN SOUTH.
VIS : POOR OR VERY POOR IN PRECIPITATION.
CRO (40S/50S, 50E/65E)
SNOW SHOWERS IN FAR SOUTH. ELSEWHERE, FRONTAL RAIN OR SHOWERS, AT
TIMES THUNDERY.
WIND:
- IN NORTH: BECOMING CLOCKWISE 7 OR 8, AT TIMES 9. SEVERE GUSTS.
- IN SOUTH: WEST DECREASING 5 OR 6, INCREASING NORTHWEST 6 OR 7 AT
END. SEVERE GUSTS.
SEA : ROUGH OR VERY ROUGH, CROSSED WITH LONG SW SWELL 4 OR 5 M,
TEMPORARILY HIGH IN FAR SOUTHEAST AND IN NORTH.
VIS : POOR OR VERY POOR IN PRECIPITATION.
KER (40S/50S, 65E/80E)
SNOW SHOWERS IN SOUTH. ELSEWHERE, FRONTAL RAIN OR SHOWERS LATER.
WIND: SOUTHWEST 7 OR 8, DECREASING 5 OR 6 LATER IN SOUTH AND
INCREASING CLOCKWISE 7 OR 8 IN NORTH, AT TIMES 9. SEVERE GUSTS.
SEA : VERY ROUGH OR HIGH. LONG SW SWELL INCREASING 4 OR 5 M, LOCALLY 6
M IN SOUTH.
VIS : POOR OR VERY POOR IN PRECIPITATION.