WEATHER BULLETIN FOR THE HIGH SEAS FOR METAREA VII.
ISSUED BY THE SOUTH AFRICAN WEATHER SERVICE ON THE
17th OF SEPTEMBER 2026 AT 17:15 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:
=======
FORECAST VALID FROM 172200 TO 182200 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-east moderating from the end of the
period.
2. TRISTAN: N to NW 35 in the south-east at first.
3. CAPE WEST: N to NW 35 in the extreme south-west at first.
4. DURBAN EAST: S to SE 35 in extreme south-west spreading to the south-
east from mid-period.
5. MARION FORTIES EAST: W to NW 35 in the south-west but in the south-
east by the end of the period.
SYNOPTIC CHART 12:00Z
=====================
High 1040 hPa 36s07e, High 1036 hPa 32s67e,
Low 998 hPa 45s12w, Low 994 hPa 57s33e, Low 990 hPa 49s66e,
1. Cold Front: 27s24e 35s18e 42s12e 47s11e into 45s12w.
2. cold front: 40s27e 45s36e 53s42e 58s33e into 57s33e.
AREA FORECAST:
==============
ASCENSION (06S/15S, 00E/20W):
WIND : S to SE 15 to 25.
VIS : Good.
ANGOLA (06S/15S, 00E/00N):
WIND : Variable in the east, otherwise S to SE 15 to 25.
VIS : Good.
SEA STATE: 3.0 to 3.5m in the extreme south-eastern, with S to SE swell.
ST HELENA (15S/30S, 00E/20W):
WIND : E to SE 15 to 25 in the east, otherwise E to NE 05 to 15, but
NW 05 to 15 in the south-west.
VIS : Good but moderate to poor in showers and thundershowers in the
extreme south-west.
SEA STATE: 3.0 to 4.0m in the north-east, with S to SE swell.
TRADES (15S/30S, 00E/WEST COAST):
WIND : S to SE 15 to 25 in the north-east, but 30 to 35 in the south-
east moderating from the end of the period.
VIS : Good.
SEA STATE: 3.0 to 4.0m reaching 5.0 to 6.0m in the east and south-east,
with S to SE swell.
TRISTAN (30S/40S, 00E/20W):
WIND : Cyclonic 10 to 20 over the central parts, otherwise N to NW 15
to 25 reaching 30 to 35 in the south-east at first.
VIS : Good but moderate to poor in showers and thundershowers across
the north-west, central parts and the south-east.
SEA STATE: 3.0 to 3.5m, with W to NW swell in the south.
CAPE WEST (30S/40S, 00E/20E):
WIND : Anticyclonic 05 to 15 over the central parts, otherwise SE to
S 25 to 30, but N to NW 25 to 35 in the extreme south-west at
first.
VIS : Good, but moderate in showers and rain in the south-west.
SEA STATE: 3.0 to 4.0m in the north-east, with SE swell but 3.0 to 4.0m
in the extreme southern parts with W to NW swell.
CAPE EAST (32.5S/40S, 20E/50E):
WIND : Anticyclonic 05 to 15 in the south, otherwise S to SE 15 to 25
but 30 in the north-east.
VIS : Good but moderate in showers and rain in the north-east and
the south-east.
SEA STATE: 3.0m 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 north-east, otherwise variable 05 to
10, but S to SE 15 to 25 in the south-west, reaching 30 to 35
in extreme south-west spreading to the south-east from mid-
period.
VIS : Good but moderate to poor in showers and thundershowers in the
South.
SEA STATE: 3.0 to 3.5m to 4.5m in the south and south-west, with S to SE
swell.
MOZAMBIQUE CHANNEL:
WIND : Variable 05 to 10 in the south, otherwise S to SE 15 to 25.
VIS : Good.
MADAGASCAR EAST (10S/25S, EAST COAST/55E):
WIND : S to SE 15 to 25 in the north, otherwise NE to N 05 to 15 in
the south, reaching 20 to 24 in the extreme south-west.
VIS : Moderate in showers and rain in places in the north-east.
SEA STATE: 3.0 to 3.5m except in the north-east, with E to SE swell.
MARION FORTIES EAST (40S/50S, 35E/50E):
WIND : W to NW 25 to 35 in the south-west but in the south-east by
the end of the period, otherwise SW 05 to 15.
VIS : Moderate in showers and rain in the southern parts, otherwise
good.
SEA STATE: 4.0 to 5.0m, reaching 5.5m in the southern half, with W
to SW swell.
AREA 2:
======
MARINE METEOROLOGICAL BULLETIN FROM METEO-FRANCE/LA REUNION ON AREA ACK (AMSTERDAM-CROZET-KERGUELEN)
26/09/17 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 TO STORM OVER OF CRO AND KER
PART 2: GENERAL SYNOPSIS, 26/09/17 AT 0000UTC
- DEEPENING LOW 997 NEAR 48S/55E, WITH ASSOCIATED COLD FRONT (CF)
AXIS 30S/34E, 38S/46E, 48S/55E, AND WARM FRONT (WF) AXIS 48S/55E,
49S/64E, 48S/74E, MOVING RATHER RAPIDLY EASTWARD. - WEAKENING HIGH
1037 NEAR 34S/65E SLOW-MOVING.
PART 3: FORECAST FOR 24 HOURS FROM 26/09/17 AT 0600UTC TO 26/09/18 AT
0600UTC
WAM (30S/40S, 50E/65E)
FRONTAL RAIN AND SHOWERS OVER SOUTHERN.
WIND: NORTHERN HALF :ANTICLOCKWISE 3/4 AT TIMES 5SOUTHERN HALF : NW 5/6 AHEAD
OF CF AT TIMES 7, BACKING SOUTHERLY 5/6 BEHIND THEN DECREASING 4/5
LATER. GUSTS.
SEA : MODERATE OVER NORTHERN, BUT ROUGH TO VERY ROUGH OVER SOUTHERN BY SW
SWELL 3 TO 5M.
VIS : POOR IN PRECIPITATION.
AMS (30S/40S, 65E/80E)
FRONTAL RAIN AND SHOWERS OVER FAR SOUTHERN AT END.
WIND : NORTHERN HALF ANTICLOCKWISE 3/4.SOUTHERN HALF : W 5/6 AT TIMES 7 WITH
GUSTS, BACKING SOUTHERLY 4/5 OVER FAR SOUTHERN AT END.
SEA : MODERATE TO ROUGH, BUT VERY ROUGH AT FIRST OVER FAR NORTH-EASTERN BY
SW SWELL 3 TO 4M, BECOMING SOON VERY ROUGH OVER FAR SOUTHERN BY SOUTH-
WESTERLY SWELL INCREASING 3 TO 5M.VISI: GOOD, BUT POOR OVER FAR
SOUTHERN AT END IN PRECIPITATION.
CRO (40S/50S, 50E/65E)
FRONTAL RAIN AND SHOWERS. SHOWERS FROM WEST BEHIND.
WIND: NW 6/7 AHEAD OF CF, BACKING SW AND INCREASING 8/9 BEHIND, TEMPORARILY
10 OVER FAR SOUTH-EASTERN. SEVERE GUSTS. BECOMING LATER WESTERLY 6/7
FROM WEST AT TIMES 8, BUT SOUTH-WESTERLY 3/4 OVER FAR NORTHERN AT
TIMES5.
SEA: VERY ROUGH TO HIGH BY WESTERLY SWELL INCREASING 4 TO 6M, BECOMING
ROUGH OVER FAR NORTH-WESTERN AT END.VISI: POOR OR VERY POOR IN
PRECIPITATION.
KER (40S/50S, 65E/80E)
FRONTAL RAIN AND SHOWERS. SHOWERS FROM WEST BEHIND.
WIND: INCREASING NW 6/7, AT TIMES 8, BECOMING SOON CLOCKWISE 8/9 LOCALEMENT
10. SEVERE GUSTS. DECREASING SOUTH-WESTERLY 5/6 OVER WESTERN AT
END.
SEA: VERY ROUGH TO HIGH, LOCALLY VERY HIGH, BY LONG WESTERLY SWELL
INCREASING 5 TO 7M, LOCALLY 8M.VISI: POOR OR VERY POOR IN
PRECIPITATION.=