WEATHER BULLETIN FOR THE HIGH SEAS FOR METAREA VII.
ISSUED BY THE SOUTH AFRICAN WEATHER SERVICE ON THE
20th OF SEPTEMBER 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 201000 TO 211000 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. MARION FORTIES EAST: SW to W 35 in the south, reaching 40 in the
extreme southern parts.
SYNOPTIC CHART 06:00Z
=====================
High 1029 hPa 34s04e, High 1034 hPa 34s49e
Low 1017 hPa 39s18e
1. Cold Front: 30s21w 33s17w 37s16w into 39s18e.
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.
VIS : Good.
ST HELENA (15S/30S, 00E/20W):
WIND : E to SE 05 to 15 but SW to S 15 to 25 in the south-west.
VIS : Good but moderate to poor in showers and thundershowers in the
south-west.
SEA STATE: 3.0 to 3.5m in the eastern parts at first, and again in the
south-west end of the period, with SE swell.
TRADES (15S/30S, 00E/WEST COAST):
WIND : S to SE 15 to 25.
VIS : Good.
SEA STATE: 3.0 m in the central and south-eastern parts, until mid-
period, with S to SE swell.
TRISTAN (30S/40S, 00E/20W):
WIND : NW 15 to 25 in the east, otherwise S to SW 15 to 25, reaching
30 in the west but E 15 in the south-east until mid-period and
cyclonic 05 to 10 in the central parts spreading south-
eastwards.
VIS : Good but moderate to poor in showers and thundershowers across
the central northern parts to the south-east.
SEA STATE: 3.0 to 4.0m in the west, with W to SW swell.
CAPE WEST (30S/40S, 00E/20E):
WIND : Anticyclonic 05 to 15 over the western parts, otherwise S to
SE 15 to 25 but W to SW 05 to 15 in the south, becoming NW 10
to 20 in the south-west towards end of period.
VIS : Good, but moderate in showers and rain in the extreme west.
SEA STATE: 3.0 to 3.5m in the east until mid-period, with SW swell in the
south-east, but SE in the north-east.
CAPE EAST (32.5S/40S, 20E/50E):
WIND : Anticyclonic 15 to 25 in the east, otherwise SE 05
to 10 but SW to W 05 to 15 in the south-west.
VIS : Good becoming moderate to poor in places in the central and
southern parts.
SEA STATE: 3.0 to 4.0m, with SW swell.
DURBAN EAST (32.5S/25S, EAST COAST/55E):
WIND : SE 05 to 15 in the north-west at first, otherwise E to
NE 15 to 25.
VIS : Good but moderate to poor in showers and rain in the east and
in the south-west.
SEA STATE: 3.0m in the central parts, with S to SE swell.
MOZAMBIQUE CHANNEL:
WIND : S to SE 15 to 25 but W to SW 05 to 15 in the east.
VIS : Good.
SEA STATE: 3.0m in the south until mid-period.
MADAGASCAR EAST (10S/25S, EAST COAST/55E):
WIND : N to NE 05 to 15 in the south, otherwise E to SE 15 to
25, reaching 30 in the north-west.
VIS : Moderate in showers and rain in the central, otherwise good.
MARION FORTIES EAST (40S/50S, 35E/50E):
WIND : W to NW 15 to 25, reaching 30 in the north-east but SW 25 to
35 in the south, reaching 40 in the extreme southern parts.
VIS : Good but moderate in showers and rain in the north but poor in
snow-showers over the south-east.
SEA STATE: 4.0 to 5.0m reaching 6.0 to 7.0m in the southern parts, but
reaching 8.0 to 10.0m in the extreme south and 11.0 to 12.0m
in the south-east towards end of the period, with W to SW
swell.
AREA 2:
======
MARINE METEOROLOGICAL BULLETIN FROM METEO-FRANCE/LA REUNION ON AREA ACK (AMSTERDAM-CROZET-KERGUELEN)
26/09/20 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 CRO.
PART 2: GENERAL SYNOPSIS, 26/09/20 AT 0000UTC
- DISTURBED FRESH OR STRONG WESTERLY FLOW OVER SOUTHERN PART OF
BASIN.
- COLD FRONT AXIS: 42S/29S, 44S/49E, 47S/65E, 50S/69E, 63S/68E
MOVING EASTWARD .
- ANTICLOCKWISE 1034 HPA NEAR 34S/46E EXPECTED 1030
HPA NEAR 30S/58E AT END.
PART 3: FORECAST FOR 24 HOURS FROM 26/09/20 AT 0600UTC TO 26/09/21 AT
0600UTC
WAM (30S/40S, 50E/65E)
SHOWERS OVER FAR SOUTHERN AT END.
WIND: ANTICLOCKWISE 3 TO 5, BUT WESTERLY 5 TO 6 TEMPORARILY 7 OVER
SOUTHERN.
SEA : MODERATE OR ROUGH, VERY ROUGH OVER FAR SOUTHERN. SW SWELL 2 TO 3 M.
VIS : POOR IN PRECIPITATION.
AMS (30S/40S, 65E/80E)
SHOWERS OVER EASTERN AT FIRST.
WIND: VARIABLE 3 TO 5 BECOMING ANTICLOCKWISE 3 TO 4 OVER NORTHERN SOON
AND WESTERLY 5 TO 6 TEMPORARILY 7 OVER SOUTHERN.
SEA : MODERATE OR ROUGH, VERY ROUGH OVER FAR SOUTHERN SOON. SW SWELL 2 TO
3 M.
VIS : POOR IN PRECIPITATION.
CRO (40S/50S, 50E/65E)
FRONTAL SHOWERS.
WIND: WESTERLY 6 TO 7, LOCALLY 8 BECOMING WESTERLY TO SOUTH-WEST 7 TO 8
LOCALLY 9 BY SOUTH-WESTERN SOON. SEVERE GUSTS.
SEA : ROUGH OR VERY ROUGH, HIGH TO VERY HIGH BY SOUTH-WESTERN SOON.
SOUTH-WESTERLY SWELL 3 TO 5 M.
VIS : POOR TO VERY POOR IN PRECIPITATION.
KER (40S/50S, 65E/80E)
FRONTAL SHOWERS. SNOW SHOWERS OVER SOUTHERN AREA.
WIND: WESTERLY 6 TO 7, DECREASING TEMPORARILY 5 TO 6 BY WESTERN AT
FIRST. GUSTS.
SEA : ROUGH OR VERY ROUGH BECOMING HIGH OVER FAR SOUTH-WESTERN AT FIRST.
SOUTH-WESTERLY SWELL, 2 TO 4 M INCREASING WESTERLY 3 TO 5 M BY
SOUTH-WESTERN AT END.
VIS : POOR TO VERY POOR IN PRECIPITATION.