WEATHER BULLETIN FOR THE HIGH SEAS FOR METAREA VII.
ISSUED BY THE SOUTH AFRICAN WEATHER SERVICE ON THE
23RD 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 231000 TO 241000 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: NW 35 to 45 in the south-eastern parts at first,
otherwise 35.
SYNOPTIC CHART 06:00Z
=====================
High 1028 hPa 35s02w, High 1032 hPa 38s70e
Low 963 hPa 55s17w, Low 940 hPa 65s43e, Low 1020 hPa 52s33e
1. Cold Front: 22s41w 30s33w 35s24w 40s18w 45s11w 50s06w into 55s17w
2. Cold Front: 35s20e 40s28e 45s38e 50s40e 55s45e into 65s43e
AREA FORECAST:
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ASCENSION (06S/15S, 00E/20W):
WIND : SE 10 to 20.
VIS : Good.
ANGOLA (06S/15S, 00E/00N):
WIND : S to SE 05 to 15 but SW 05 to 10 in the east.
VIS : Good.
ST HELENA (15S/30S, 00E/20W):
WIND : SE to E 10 to 20 but NE to N 05 to 15 in the south-west.
VIS : Good but moderate in rain in the south-east and east.
SEA STATE: 3.0m in the south-east, with SE swell.
TRADES (15S/30S, 00E/WEST COAST):
WIND : SE to E 10 to 20.
VIS : Good but moderate in showers and rain in the south-west.
SEA STATE: 3.0 in the south-west, with SE swell.
TRISTAN (30S/40S, 00E/20W):
WIND : Anti-cyclonic 05 to 15 over the south-east, and SE 10 to 20 in
the north-east, otherwise NW 15 to 25, reaching 30 in the
south-west.
VIS : Good, but moderate to poor in showers and thundershowers in
the south-west.
SEA STATE:4.0 to 5.0m in the south-west, with W to NW swell.
CAPE WEST (30S/40S, 00E/20E):
WIND : N to NE 05 to 15 in the north-east, otherwise SE to S 15 to
25.
VIS : Good, but moderate in showers and thundershowers in places in
the east and central parts.
SEA STATE: 3.0m in the south-east from mid-period, with S to SW swell.
CAPE EAST (32.5S/40S, 20E/50E):
WIND : NW 20 to 30 in the south-east in the first half of the period
and anti-cyclonic 05 to 15 over the north and north-eastern
parts, otherwise E to SE 15 to 25 reaching 30 over the central
south.
VIS : Good but moderate to poor in showers and thundershowers in
places over the central and south-eastern parts.
SEA STATE: 3.0m with SE swell over the south-west, but 3.5m in the east
with S to SW swell.
DURBAN EAST (32.5S/25S, EAST COAST/55E):
WIND : Anti-cyclonic 05 to 15 over the central parts but S to SW 10
to 15 in the east, and N to NE 10 to 20 in the west.
VIS : Good but moderate to poor in showers and thundershowers in
the eastern parts.
SEA STATE: 3.0 to 4.0m over the western half, with S swell.
MOZAMBIQUE CHANNEL:
WIND : S to SE 10 to 20 but NE 05 to 15 in the south-west during the
second half of the period.
VIS : Good.
MADAGASCAR EAST (10S/25S, EAST COAST/55E):
WIND : E to SE 05 to 15 in the northern parts but N to NE 05 to 15in
the central and southern parts.
VIS : Good, but moderate in showers and thundershowers in the
south.
SEA STATE: 3.0m in the southern parts, with S swell.
MARION FORTIES EAST (40S/50S, 35E/50E):
WIND : NW 20 to 30 in the eastern parts, reaching 35 to 45 in the
south-eastern parts at first, otherwise SW 25 to 35.
VIS : Moderate in showers and rain with snow-showers over the
southern parts.
SEA STATE: 3.0 to 4.0m reaching 5.0 to 7.0m in the in the southern parts,
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)
26/09/23 AT 0600UTC
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) EXPECTED OVER CRO AND KER.- GALE (FORCE 8) RUNNING OVER CRO AND KER.
PART 2: GENERAL SYNOPSIS, 26/09/23 AT 0000UTC
- HIGH-PRESSURE SYSTEM 1033 HPA NEAR 39S/70E, MOVING EASTWARDS, FORECAST TO BE 1035 HPA NEAR 38S/85E ON THE 24TH AT 06 UTC.- LOW-PRESSURE SYSTEM 1014 HPA NEAR 34S 51E, MOVING EASTWARDS FILLING WITH A COLD FRONT (CF) AXIS 29S/50E, 33S/52E, 35S/51E AND A WARM FRONT (WF) AXIS 35S/50E, 35S/57E.- COLD FRONT CG APPROACHING CRO THEN KER.
PART 3: FORECAST FOR 24 HOURS FROM 26/09/23 AT 0600UTC TO 26/09/24 AT 0600UTC
WAM (30S/40S, 50E/65E)
RAIN AND SHOWERS, LOCALLY ACCOMPANIED BY THUNDERSTORMS, OVER THE WESTERN REGION, MOVING SLOWLY EASTWARDS.
WIND : CLOCKWISE FORCE 5 TO 7 OVER NORTH-WESTERN AREA, SETTING-UP NORTH 5
TO 7, THEN SOUTH-EAST 4 TO 6 OVER WESTERN AREA, FRESHENING NORTH 5
TO 7 OVER EASTERN.
SEA : ROUGH TO VERY ROUGH, BECOMING MODERATE TO ROUGH. LONG SOUTH-
WESTERLY SWELL OF 3 TO 5 METRES, ABATING.
VIS : POOR TO VERY POOR DURING RAINFALL.
AMS (30S/40S, 65E/80E)
SCATTERED SHOWERS MORE FREQUENT OVER THE NORTHERN PART OF THE AREA.
WIND : ANTICLOCKWISE 2 TO 4 OVER SOUTHERN AREA, FRESHENING E 3 TO 5 OVER
NORTHERN PART OF THE AREA, THEN FRESHENING N 4 TO 6 OVER WESTERN
AREA AT THE END OF THE FORECAST PERIOD.
SEA : VERY ROUGH TO HIGH, BECOMING MODERATE TO ROUGH. SOUTH-WESTERLY
SWELL OF 4 TO 6 METRES, SUBSIDING 3 TO 4 METRES.
VIS : AVERAGE DURING RAINFALL.
CRO (40S/50S, 50E/65E)
RAIN AND SNOW WITH FRONTAL SHOWERS MOVING OVER THE SOUTH-WESTERN AREA.
WIND : NORTH OF 50E: NORTH TO NORTH-WEST 4 TO 6, LOCALLY 7.SOUTH OF 50E:
NORTH-WEST 6 TO 7, BUT 8/9 WITH STRONG GUSTS IN THE SOUTH-WEST OF
THE AREA.THEN NORTH-WESTERLY 5 TO 7, FRESHENING TO 8/9 AHEAD OF A
NEW FRONT DURING THE NIGHT AND RETURNING SOUTH-WESTERLY 6/7 BEHIND
IT.
SEA : ROUGH TO VERY ROUGH. LONG SOUTH-WESTERLY SWELL OF 2 TO 4 METRES,
COMBINED WITH HIGH WIND SEAS.
VIS : VERY POOR IN PRECIPITATION.
KER (40S/50S, 65E/80E)
SCATTERED SHOWERS, OCCASIONALLY SNOWY.
WIND : PREDOMINANTLY WESTERLY, FORCE 4 TO 7 FROM NORTH TO SOUTH, LOCALLY
FORCE 8; VEERING NORTH-WESTERLY, FORCE 5 TO 7, LOCALLY FORCE 8/9,
AHEAD OF A NEW FRONT TOWARDS THE END OF THE FORECAST PERIOD.
GUSTS.
SEA : ROUGH TO VERY ROUGH. A LONG SOUTH-WESTERLY SWELL OF 4 TO 6 METRES,
SUBSIDING AND CROSSING WITH A HIGH WIND SEA.
VIS : POOR DURING RAINFALL.