WEATHER BULLETIN FOR THE HIGH SEAS FOR METAREA VII.
ISSUED BY THE SOUTH AFRICAN WEATHER SERVICE ON THE
17th OF OCTOBER 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 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. MARION FORTIES EAST: W to SW 35 to 40 in the south for the first
half of the period.
SYNOPTIC CHART 12:00Z
=====================
High 1031 hPa 35s14w High 1028 hPa 30s58e.
AREA FORECAST:
==============
ASCENSION (06S/15S, 00E/20W):
WIND : SE to E 10 to 20.
VIS : Good.
ANGOLA (06S/15S, 00E/00N):
WIND : S to SE 10 to 20 but SW 05 to 10 in the east.
VIS : Good.
ST HELENA (15S/30S, 00E/20W):
WIND : E to SE 15 to 25 but NE 15 to 25 in the south-west.
VIS : Moderate in showers in the south-east at first, otherwise good
but moderate in showers and rain in the extreme south-west.
SEA STATE: 3.0 to 4.0m over the southern and central parts, with S to SE
swell.
TRADES (15S/30S, 00E/WEST COAST):
WIND : S to SE 15 to 25 reaching 30 in places in the east.
VIS : Good but moderate in showers and rain in the south-west at
first.
SEA STATE: 3.0 to 3.5m reaching 4.0m in places in the east from mid-
period, with S to SW swell.
TRISTAN (30S/40S, 00E/20W):
WIND : Anticyclonic 05 to 15 in the north-east, otherwise W to NW 10
to 20 but NE 20 to 30 in the north-west.
VIS : Good but moderate to poor in showers and rain in the north-
west from mid-period spreading to the entire western parts
towards the end of the period.
SEA STATE: 3.0 to 3.5m over the southern and eastern parts, with S to SW
swell. It will become 3.0 to 4.0m in the north-west from mid-
period, with N swell.
CAPE WEST (30S/40S, 00E/20E):
WIND : W to SW 10 to 20 reaching 25 in the extreme south but S to SE
15 to 20 in the north-east. It will become anticyclonic 05 to
10 in the north-west from mid-period.
VIS : Good but moderate in showers in the south.
SEA STATE: 3.0 to 3.5m in the east and south, reaching 4.0 to 4.5m in the
south-east at first, with SW swell.
CAPE EAST (32.5S/40S, 20E/50E):
WIND : NW 10 to 20 in the north-east, otherwise SE to E 10 to 20
reaching 25 to 30 in the extreme central north from mid-period
but variable 05 to 10 in the south-west.
VIS : Good in the north-east, otherwise moderate in showers and
rain but poor in the central north from mid-period.
SEA STATE: 3.0 to 3.5m reaching 4.0m in the west spreading to the central
parts by mid-period, with SW swell but NW swell in the east.
DURBAN EAST (32.5S/25S, EAST COAST/55E):
WIND : NE 15 to 25 but S to SW 10 to 20 in the south-west for the
first half of the period.
VIS : Good, becoming moderate in showers and thundershowers in the
extreme south-west from mid-period.
SEA STATE: 3.0 to 3.5m over the central parts, with NE swell.
MOZAMBIQUE CHANNEL:
WIND : Variable 05 to 10 over the central and eastern parts,
otherwise E to NE 10 to 15.
VIS : Good.
MADAGASCAR EAST (10S/25S, EAST COAST/55E):
WIND : E to SE 10 to 20 reaching 25 in the extreme north but E to NE
10 to 20 in the south reaching 25 in the extreme south-west.
VIS : Mainly good.
SEA STATE: 3.0m in the northern parts, with SE swell.
MARION FORTIES EAST (40S/50S, 35E/50E):
WIND : W to SW 15 to 25 reaching 30 to 40 in the south for the first
half of the period. It will become anticyclonic 05 to 15 in
the north towards the end of the period.
VIS : Good but moderate in showers and snow-showers in the south.
SEA STATE: 3.5 to 4.5m reaching 5.0 to 7.0m in the south, with W to SW
swell.
AREA 2:
======
MARINE METEOROLOGICAL BULLETIN FROM METEO-FRANCE/LA REUNION ON AREA
ACK (AMSTERDAM-CROZET-KERGUELEN)
26/10/17 AT 1700UTC
AVERAGED WIND SPEED ON BEAUFORT SCALE. (WIND GUSTS MAY BE ABOUT 40%
STRONGER THAN THE AVERAGES GIVEN HERE).
PART 1: WARNING
- GALE TO STRONG GALE FORCE 8 TO 9 OVER CRO AND KER.
- STROM FORCE 10 EXPECTED ON KER.
PART 2: GENERAL SYNOPSIS, 26/10/17 AT 1200UTC
- HIGH 1028 HPA, NEAR 30S/60E, SLOW-MOVING.
- LOW AT 952 HPA NEAR 56S47E, DEEPENING AND MOVING EASTWARD. ASSOCIATED
COLD FRONT EXTENDING FROM 56S50E TO 50S60E, 45S55E, AND 40S38E.
PART 3: FORECAST FOR 24 HOURS FROM 26/10/17 AT 1800UTC TO 26/10/18
AT 1800UTC
WAM (30S/40S, 50E/65E)
SHOWERS EXPECTED SOON IN THE SOUTH.
WIND: NORTHERN HALF: NORTH TO NORTHWEST 3/4 IN THE WEST, WESTERLY 2/4
IN THE EAST.
SOUTHERN HALF: WEST TO NORTHWEST 5 TO 6 FROM NORTH TO SOUTH,
WEAKENING TO 3/4 IN THE WEST BY END.
SEA : MODERATE TO ROUGH FROM NORTH TO SOUTH. WEST TO SOUTHWEST SWELL 2
TO 3 METERS FROM NORTH TO SOUTH.
VIS : MODERATE UNDER SHOWERS.
AMS (30S/40S, 65E/80E)
SCATTERED SHOWERS AT END.
WIND: WESTERLY, FORCE 4 TO 6 FROM NORTH TO SOUTH, WEAKENING 3/4
IN THE SOUTHWESTERN PART OF THE AREA AT END.
SEA : MODERATE TO ROUGH FROM NORTH TO SOUTH, LOCALLY VERY ROUGH IN THE
FAR SOUTH. SOUTHWEST SWELL, 2 TO 3 METERS FROM NORTH TO SOUTH.
VIS : GOOD.
CRO (40S/50S, 50E/65E)
RAIN AND FRONTAL SHOWERS.
WIND: NORTHERN HALF: NORTHWEST 6/7, DECREASING WEST 3/5 WITH SOUTHERLY
3/4 IN THE FAR NORTH.
SOUTHERN HALF: WEST 6 TO 8 FROM NORTH TO SOUTH, LOCALLY 9 IN THE
FAR SOUTH.VIOLENT GUSTS.
SEA : ROUGH TO HIGH FROM NORTH TO SOUTH, LOCALLY VERY HIGH IN THE FAR
SOUTH. SOUTHWEST SWELL 3 TO 5 METERS, LOCALLY 8 METERS IN THE
FAR SOUTH.
VIS : POOR DURING PRECIPITATION.
KER (40S/50S, 65E/80E)
RAIN AND FRONTAL SHOWERS.
WIND: NORTHERN HALF: WEST 6/7, SOON WEAKENING TO 4/5 WEST OF THE AREA.
SOUTHERN HALF: WEST 7/8 INCREASING TO 7/9, TEMPORARILY REACHING
10. VIOLENT GUSTS.
SEA : VERY ROUGH TO HIGH, BECOMING HIGH TO VERY HIGH. CROSS SEAS WITH
A SOUTHWEST SWELL OF 3 TO 4 METERS, BUILDING TO 5 TO 8 METERS
SOUTHWEST OF THE AREA AT END.
VIS : POOR TO VERY POOR DURING PRECIPITATION.