WEATHER BULLETIN FOR THE HIGH SEAS FOR METAREA VII.
ISSUED BY THE SOUTH AFRICAN WEATHER SERVICE ON THE
18th OF SEPTEMBER 2026 AT 13:30 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 0500UTC
AVERAGED WIND SPEED ON BEAUFORT SCALE. (Wind gusts may be about 40% stronger than the averages given here).
PART 1: WARNING
- Gale over KER and CRO.
PART 2: GENERAL SYNOPSIS, 26/09/18 AT 0000UTC
- A low-pressure system at 977 hPa near 51S/82E is deepening and moving eastwards.- Associated cold front (CF) axis 48S/83E, 45S/80E, 41S/70E, 40S/67E, 40S/65E, 38S/60E, 35S/60E.- High-pressure system 1032 hPa near 31S/69E, almost-stationary.- Cold front (CG) axis 46S/53E, 50S/55E, 56S/52E, moving eastwards at 20/25 kt.
PART 3: FORECAST FOR 24 HOURS FROM 26/09/18 at 0600UTC to 26/09/19 at 0600UTC
WAM (30S/40S, 50E/65E)
Rain and frontal showers under a cold front CF.
WIND : In the north, ahead of the front: north-westerly, force 24,
occasionally force 5 near the front. In the south, behind the
front: southerly winds 34, locally 57 near the front.
SEA : rough to very rough from north to south. South-westerly swell of 3
m in the southern area.
VIS : poor during rainfall.
AMS (30S/40S, 65E/80E)
Rain and frontal showers over southern under the cold front CF.
WIND : Northern half: anticlockwise2/4, freshening westerly 3/4 ahead of
the cold front. Southern half: north-westerly 5/6, occasionally 7
with gusts ahead of the cold front, veering south 3 to 5 behind
the cold front.
SEA : Moderate to very rough from north to south. South-westerly swell
2 to 3 m from north to south, locally 4/5 m over far southern.
VIS : poor during rainfall.
CRO (40S/50S, 50E/65E)
Rain and frontal showers under a new CG front moving rapidly from west to east across the southern part of the region.
WIND : North-westerly to westerly, then westerly by the end of the
period, force 6/7, occasionally 8, easing to westerly force 4 to
6 by the end of the forecast period.
SEA : Rough to very rough. Swell from the west to south-west, 2 to 4
metres.
VIS : Poor during rainfall.
KER (40S/50S, 65E/80E)
Rain and frontal showers under a cold front CF over far northern of the region, followed by rain and frontal showers under a warm front over southern of the region.
WIND : West to South-West, force 68, with strong gusts. Easing to North-
West, force 36 from north to south, then veering west, force 67,
temporarily reaching force 8 in the wake of the cold front.
SEA : Very rough to high. Western swell increasing 4 to 6 metres.
VIS : Poor to very poor during precipitation.