WEATHER BULLETIN FOR THE HIGH SEAS FOR METAREA VII.
ISSUED BY THE SOUTH AFRICAN WEATHER SERVICE ON THE
23RD OF SEPTEMBER 2026 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 232200 TO 242200 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 12:00Z
=====================
High 1030 hPa 37s01w, High 1022 hPa 33s40e, High 1035 hPa 37s75e
Low 963 hPa 56s11w, Low 931 hPa 65s57e, Low 1014 hPa 34s52e
1. Cold Front: 20s41w 25s35w 30s30w 35s23w 40s15w 45s06w into 56s11w
2. Cold Front: 38s27e 42s36e 50s51e 55s57e into 65s57e
AREA FORECAST:
==============
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: 3.0m 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 to 35 in
the south-west.
VIS : Good, but moderate to poor in showers and thundershowers in
the south-west, spreading to the south-east during the second
half of the period.
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 south-
east in the first half of the period.
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 15 in
the central and southern parts.
VIS : Good, but moderate in showers and thundershowers in the
south.
SEA STATE: 3.0m in the southern parts in the first half of the period,
with S swell.
MARION FORTIES EAST (40S/50S, 35E/50E):
WIND : S to SW 05 to 15 in the north-west, elsewhere 20 to 30,
reaching 35 in the south-east at first. It will become W to NW
30 to 35, exce but
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:
======
MARINE METEOROLOGICAL BULLETIN FROM METEO-FRANCE/LA REUNION ON AREA
ACK (AMSTERDAM-CROZET-KERGUELEN)
26/09/23 AT 1600UTC
AVERAGED WIND SPEED ON BEAUFORT SCALE. (WIND GUSTS MAY BE ABOUT 40%
STRONGER THAN THE AVERAGES GIVEN HERE).
PART 1: WARNING
- GALE FORCE 8 OVER CRO AND KER.
PART 2: GENERAL SYNOPSIS, 26/09/23 AT 1200UTC
- LOW 1013 HPA NEAR 35S/53E, EXPECTED 1007 HPA NEAR 39S/65E AT END.
- COLD FRONT MOVING IN FROM THE WEST OF CRO AT THE BEGINNING, THEN
LOCATED EAST OF KER AT THE END.
- HIGH 1035 HPA NEAR 38S/75E, SET TO
LEAVE AMS SOON.
PART 3: FORECAST FOR 24 HOURS FROM 26/09/23 AT 1800UTC TO 26/09/24
AT 1800UTC
WAM (30S/40S, 50E/65E)
FRONTAL SHOWERS AND SQUALLS.
WIND : CLOCKWISE 5 TO 6 OVER NORTH-WESTERN AREA, NORTH-EAST 4
TO 5 ELSEWHERE. SETTING-UP SOUTH-WEST 5 TO 6 BEHIND THE
LOW SOON THEN SOUTHERLY LATER.
SEA : MODERATE TO ROUGH. SOUTH-WEST SWELL 2 TO 3 M, TEMPORARY NORTH-WEST
DURING THE DAY.
VIS : POOR DURING PRECIPITATION.
AMS (30S/40S, 65E/80E)
SHOWERS.
WIND : ANTICLOCKWISE 3 TO 5, SETTING-UP NORTH-EAST TO NORTH 5
TO 6 BEHIND, LOCALLY 7 AT END.
SEA : ROUGH TO VERY ROUGH, BECOMING ROUGH AT END. SOUTH-WEST SWELL
4 TO 5 M, DECREASING 2 TO 3 M AT END.
VIS : POOR UNDER PRECIPITATION.
CRO (40S/50S, 50E/65E)
FRONTAL SHOWERS, OCCASIONALLY SNOWY.
WIND : NORTH-WEST 7 TO 8 AHEAD THE FRONT, BACKING SOUTH-WEST 7
TO 8 BEHIND BY SOUTH-WESTERN. SETTING-UP ANTICLOCKWISE 3
TO 5 BY NORTH-WESTERN AT END. GUSTS.
SEA : ROUGH TO VERY ROUGH BECOMING HIGH BY SOUTHERN. WESTERLY
SWELL THEN SOUTH-WEST 4 TO 6 M.
VIS : POOR TO VERY POOR IN PRECIPITATION.
KER (40S/50S, 65E/80E)
FRONTAL SHOWERS, OCCASIONALLY SNOWY.
WIND : SETTING-UP NORTH-WEST 5 TO 6 THEN 7 TO 8 AHEAD THE FRONT
BY WESTERN SOON. SOUTH-WESTERLY 6 TO 7 BEHIND. GUSTS.
SEA : ROUGH TO VERY ROUGH LOCALLY HIGH OVER FAR SOUTHERN.
SOUTH-WEST SWELL 3 TO 5 M, THEN ARRIVAL OF A WESTERLY
SWELL 4 TO 5 M BY WESTERN LATER.
VIS : POOR TO VERY POOR UNDER PRECIPITATION.