WEATHER BULLETIN FOR THE HIGH SEAS FOR METAREA VII.
ISSUED BY THE SOUTH AFRICAN WEATHER SERVICE ON THE
18th OF SEPTEMBER 2026 AT 16:30 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 182200 TO 192200 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. TRADES : S to SE 35 in the south and south-east at first.
2. CAPE WEST : S to SE 35 in the north-east until mid-period.
3. DURBAN EAST: S to SE 35 in the south-east at first.
4. MARION FORTIES EAST: W to NW 35 to 40 in the south until the
late afternoon, becoming SW 35 in the south-
west towards the end of the period.
SYNOPTIC CHART 12:00Z
=====================
High 1032 hPa 38s30e.
Low 1021 hPa 34s18w.
1. Cold Front: 20s28w 27s21w 31s16w into 34s18w.
AREA FORECAST:
==============
ASCENSION (06S/15S, 00E/20W):
WIND : E to SE 15 to 25.
VIS : Good.
SEA STATE: 3.0 to 3.5m in the east and south-east, with SE swell.
ANGOLA (06S/15S, 00E/00N):
WIND : Variable 05 to 10 in the east, otherwise S to SE 15 to 25.
VIS : Good.
SEA STATE: 3.0 to 4.0m in the central and southern parts, spreading to
the north-west from the morning, with S to SE swell.
ST HELENA (15S/30S, 00E/20W):
WIND : N to NW 05 to 15 in the south, otherwise E to SE 15 to 25.
VIS : Good but moderate in showers and thundershowers in the south-
west.
SEA STATE: 3.0 to 4.0m in the eastern half, with S to SE swell.
TRADES (15S/30S, 00E/WEST COAST):
WIND : Variable 05 to 10 in the extreme east, otherwise S to SE 15 to
25 reaching 30 to 35 in the south and south-east at first.
VIS : Good.
SEA STATE: 3.0 to 4.0m reaching 4.5 to 5.0m in the central and south-
east at first, with S to SE swell.
TRISTAN (30S/40S, 00E/20W):
WIND : Variable 05 to 10 in the southern parts, but cyclonic 10 to 20
over the western parts, otherwise N to NW 15 to 25.
VIS : Moderate in showers and rain over the south-east, but moderate
to poor in showers and thundershowers in places in the north-
west and central parts, otherwise good.
SEA STATE: 3.0 to 3.5m in the central and southern half subsiding from
mid-period, with W to NW swell.
CAPE WEST (30S/40S, 00E/20E):
WIND : N to NW 15 to 25 in the southern parts, but S to SE 20 to 30
in the north and east, reaching 35 in the north-east until
mid-period, otherwise anti-cyclonic 05 to 15.
VIS : Good, but moderate in showers and rain in the south-west.
SEA STATE: 3.0 to 4.0m in the east, north and southern parts, with W to
NW swell in the south, otherwise S to SE.
CAPE EAST (32.5S/40S, 20E/50E):
WIND : S to SE 15 to 25 in the north and north-east, but E to NE 15
to 25 in the west and north-west, otherwise anti-cyclonic 05
to 15.
VIS : Good but moderate in showers and rain in the north-east as
well as north-west from mid-period.
SEA STATE: 3.0 to 3.5m in places, with SE swell, but SW over the southern
parts.
DURBAN EAST (32.5S/25S, EAST COAST/55E):
WIND : N to NE 15 to 25 in the south-west, but variable 05 to 10 in
the north-east, otherwise S to SE 15 to 25, reaching 30 to 35
in the south-east at first.
VIS : Good but moderate to poor in showers and rain in the west and
south-east, clearing in the south-east from late afternoon.
SEA STATE: 3.0 to 4.0m in the south, central and west spreading to the
east from mid-period, with S to SE swell.
MOZAMBIQUE CHANNEL:
WIND : S to SE 05 to 15, reaching 20 to 30 in the south-east.
VIS : Good.
SEA STATE: 3.0 to 3.5m in the south-east from the afternoon, with SE
swell.
MADAGASCAR EAST (10S/25S, EAST COAST/55E):
WIND : N to NE 05 to 15 in the south, otherwise S to SE 15 to 25,
reaching 30 in the north-west.
VIS : Moderate in showers and rain in the northern parts, otherwise
good.
SEA STATE: 3.0m in the northern parts, with E to SE swell.
MARION FORTIES EAST (40S/50S, 35E/50E):
WIND : W to NW 15 to 25, reaching 30 to 40 in the south until the
late afternoon. It will become SW 20 to 30 in the south-west
from mid-period, reaching 30 to 35 towards the end of the
period.
VIS : Good but moderate in showers and rain in the west and southern
parts, spreading to the east and south-east from mid-period,
while clearing in the south-west.
SEA STATE: 3.0 to 4.0m reaching 5.0 to 6.0m in the central and southern
parts, with W to SW swell.
AREA 2:
======
MARINE METEOROLOGICAL BULLETIN FROM METEO-FRANCE/LA REUNION ON AREA
ACK (AMSTERDAM-CROZET-KERGUELEN)
26/09/18 AT 1600UTC
AVERAGED WIND SPEED ON BEAUFORT SCALE. (WIND GUSTS MAY BE ABOUT 40%
STRONGER THAN THE AVERAGES GIVEN HERE).
PART 1: WARNING
- GALE CONTINUING OR EXPECTED OVER CRO AND KER.
PART 2: GENERAL SYNOPSIS, 26/09/18 AT 1200UTC
- DISTURBED FRESH OR STRONG WESTERLY FLOW IN SOUTHERN PART OF BASIN.-
WAVING FRONT ALONG 37N, SLOWLY MOVING TO NORTHEAST OF MAS, BETWEEN AN
HIGH BELT 1030 OVER FAR NORTH OF AREAS AND A RIDGE GRADUALLY BUILDING
1034 OVER WEST OF WAM.
PART 3: FORECAST FOR 24 HOURS FROM 26/09/18 AT 1800UTC TO 26/09/19
AT 1800UTC
WAM (30S/40S, 50E/65E)
FRONTAL RAIN OR SHOWERS.
WIND: - IN NORTH AHEAD THE FRONT: NORTHWEST 3 OR 4, AT TIMES 5 NEAR
THE FRONT.
- IN SOUTH, BEHIND THE FRONT: SOUTHERLY 4 OR 5, BUT LOCALLY 6
OR 7 NEAR THE FRONT WITH GUSTS.
SEA : MODERATE OR ROUGH DUE MAINLY TO SW SWELL, LOCALLY CROSSED NEAR
THE FRONT.
VIS : POOR IN PRECIPITATION.
AMS (30S/40S, 65E/80E)
FRONTAL RAIN OR SHOWERS.
WIND: - FAR NNORTH: ANTICLOCKWISE 2 TO 4.
-ELSEWHERE: NORTHWEST 4 OR 5 AHEAD THE FRONT, AT TIMES 6,
BACKING SOUTHERLY BEHIND. GUSTS.
SEA : MODERATE OR ROUGH, DUE
MAINLY TO SW SWELL, LOCALLY VERY ROUGH IN SOUTHEAST, AND
CROSSED NEAR THE FRONT.
VIS : POOR IN PRECIPITATION.
CRO (40S/50S, 50E/65E)
FRONTAL RAIN OR SHOWERS.
WIND: WEST OR SOUTHWEST 5 OR 6, INCREASING SOON NORTHWEST 6 OR 7,
AT TIMES 8. SEVERE GUSTS.
SEA : ROUGH OR VERY ROUGH, CROSSED IN SW SWELL.
VIS : POOR IN PRECIPITATION.
KER (40S/50S, 65E/80E)
FRONTAL RAIN OR SHOWERS.
WIND: WESTERLY 6 OR 7, AT TIMES 8, DECREASINGSOON TEMPORARILY 5
OR 6. SEVERE GUSTS.
SEA : ROUGH OR VERY ROUGH, CROSSED IN SW SWELL, LOCALLY HIGH AT
FIRST IN FAR EAST.
VIS : POOR IN PRECIPITATION.