WEATHER BULLETIN FOR THE HIGH SEAS FOR METAREA VII.
ISSUED BY THE SOUTH AFRICAN WEATHER SERVICE ON THE
18th 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:
=======
FORECAST VALID FROM 181000 TO 191000 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 central and south-east, spreading to
the south from the evening, while moderating in the
central parts.
2. CAPE WEST : S to SE 35 in places in the north and east.
3. DURBAN EAST: S to SE 35 in places in the west at first as well as
in the south-east from the evening until tomorrow
morning.
4. MARION FORTIES EAST: W to NW 35 to 40 in the south at times.
SYNOPTIC CHART 06:00Z
=====================
High 1040 hPa 38s26e.
Low 1020 hPa 36s19w
1. Cold Front: 19s29e 25s22w 30s20w into 36s19w.
AREA FORECAST:
==============
ASCENSION (06S/15S, 00E/20W):
WIND : E to SE 15 to 25.
VIS : Good.
SEA STATE: 3.0 to 4.0m 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 tomorrow morning, with S to SE swell.
ST HELENA (15S/30S, 00E/20W):
WIND : N to NW 10 to 20 in the south, otherwise E to SE 15 to 25,
reaching 30 in the north-east during the first half of the
period.
VIS : Good but moderate in showers and thundershowers in the south-
west.
SEA STATE: 3.0 to 4.0m in the east, reaching 4.5m at first, with S to SE
swell.
TRADES (15S/30S, 00E/WEST COAST):
WIND : S to SE 15 to 25 reaching 30 to 35 in the central and south-
east, spreading to the south from the evening, while
moderating in the central parts.
VIS : Good.
SEA STATE: 3.0 to 4.0m reaching 4.5 to 5.0m in the central, south-east
and north-west during the first half of the period, 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 reaching 30
in the south-east at first.
VIS : Moderate in showers and rain over the south-east, but moderate
to poor in showers and thundershowers in places in the west
and central parts.
SEA STATE: 3.0 to 3.5m in the central and southern half, reaching 4.0 to
4.5m in the south and south-east until mid-period, with W to
NW swell.
CAPE WEST (30S/40S, 00E/20E):
WIND : N to NW 15 to 25 in the south and south-west, reaching 30
during the first half of the period, but S to SE 20 to 30 in
the north and east, reaching 35 in places, 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, reaching
4.5m in the south-west until mid-period, with W to NW swell in
the south, but S to SE in the east and northern parts.
CAPE EAST (32.5S/40S, 20E/50E):
WIND : S to SE 20 to 30 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 and
the north-west, clearing in the north-west from the evening.
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 : Variable 05 to 10 in the east, otherwise S to SE 15 to 25,
reaching 30 to 35 in places in the west at first as well as in
the south-east from the evening until tomorrow morning.
VIS : Good but moderate to poor in showers and rain in the south and
west, spreading to the south-east from the evening while
clearing in the south.
SEA STATE: 3.0 to 3.5m in the south and west, reaching 4.0 to 4.5m in the
west at first, with S to SE swell.
MOZAMBIQUE CHANNEL:
WIND : S to SE 05 to 15, reaching 20 to 25 in the south-east and
south-west from the evening.
VIS : Good.
MADAGASCAR EAST (10S/25S, EAST COAST/55E):
WIND : N to NE 05 to 15 in the south, reaching 20 to 25 in the south-
west, otherwise S to SE 15 to 25.
VIS : Moderate in showers and rain in the northern parts, otherwise
good.
SEA STATE: 3.0 to 3.5m 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 at times.
VIS : Good but moderate in showers and rain in the southern parts at
first, as well as from mid-period, spreading to the west and
central parts from tomorrow morning.
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.