WEATHER BULLETIN FOR THE HIGH SEAS FOR METAREA VII.
ISSUED BY THE SOUTH AFRICAN WEATHER SERVICE ON THE
18TH OF SEPTEMBER 2025 AT 17:00 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. MARION FORTIES EAST: S to SW 35 in the central parts from mid-period
that will spread to the south-east by the end of
the period.
SYNOPTIC CHART 12:00Z
=====================
High 1024 hPa 45s13e High 1022 hPa 29s48e
Low 1016 hPa 38s04e, Low 951 hPa 55s63e
1. Cold Front: 39s36e 40s48e 45s57e 51s65e into 55s63e
AREA FORECAST:
==============
ASCENSION (06S/15S, 00E/20W):
WIND : SE to E 10 to 20.
VIS : Good.
ANGOLA (06S/15S, 00E/00N):
WIND : W to SW 05 to 10 in the east, otherwise S to SE 05 to 15.
VIS : Good.
ST HELENA (15S/30S, 00E/20W):
WIND : Variable 05 to 10 in the central-eastern parts, otherwise S to
SE 05 to 15, reaching 20 in places in the west, but NE 15 in
the south-east until mid-period becoming SW to S 05 to 15 in
the south-west spreading eastwards by the end of the period.
VIS : Good, but moderate in showers and rain in the north-west,
central parts and south-east until mid-period.
TRADES (15S/30S, 00E/WEST COAST):
WIND : Variable 05 to 10 in the central-west but NW 05 to 15 in the
south-west, otherwise S to SE 10 to 20, reaching 25 in the
south-east becoming SW 05 to 15 in the south-west from mid-
period.
VIS : Good, becoming moderate in rain in the south-west until mid-
period.
SEA STATE: 3.0m in the east at first, with S to SW swell.
TRISTAN (30S/40S, 00E/20W):
WIND : Cyclonic 05 to 15, but S to SW 10 to 20 in the east, and NW to
W 15 to 25 in the west, reaching 30 in the south-west,
spreading eastwards where it will become SW 15 to 25 from mid-
period.
VIS : Good, otherwise moderate in showers and rain in the north-east
at first and in the south-west spreading to the central parts
by mid-period.
SEA STATE: 3.0m in the south-west, reaching 4.0m by mid-period, with SW
swell.
CAPE WEST (30S/40S, 00E/20E):
WIND : S to SE 15 to 25 in the north-east, but NE to N 05 to 15 in
the south-east, otherwise NW 05 to 15 but SW in the south-west
by mid-period.
VIS : Good, but moderate in rain and showers in places in a band
from north-west to central-south spreading to the south-east
by mid-period.
SEA STATE: 3.0m in the eastern half at first, then again at the end of
the period, with S to SW swell, becoming NE swell at end of
period.
CAPE EAST (32.5S/40S, 20E/50E):
WIND : W to SW 15 to 25, reaching 30 in the east becoming SE to E 05
to 15 in the west where it will become NE 15 to 25 by mid-
period where it will reach 30 to 35 by the end of the period.
VIS : Moderate in showers and rain in places, becoming good in the
central part from mid-period.
SEA STATE: 3.0 to 4.0m, reaching 5.0 to 6.5m in the central and eastern
parts, with W to SW swell becoming E to SE swell in the north-
west by end of period.
DURBAN EAST (32.5S/25S, EAST COAST/55E):
WIND : Anti-cyclonic 05 to 15, but S to SW 10 to 20 in the
south-west and SE 10 to 20 in the central-north and NE 10
to 20 in the north-west, otherwise NW 10 to 20, reaching 30 in
the south-east becoming S to SE in the west by mid-period.
VIS : Good, but moderate in showers and thundershowers in places in
the east, becoming moderate in showers and rain in the west
towards mid-period spreading to the south-east by end of
period.
SEA STATE: 3.0 to 4.0m, reaching 5.0 to 6.0m in the central and southern
parts, spreading to the south-east by mid-period, with
S to SW swell.
MOZAMBIQUE CHANNEL:
WIND : N to NE 10 to 20 in the west, otherwise E to SE 05 to 15,
reaching 20 to 25 in the south-east but 30 from mid-period.
VIS : Good.
SEA STATE: 3.0 to 4.0m in the south and eastern parts, with SW swell.
MADAGASCAR EAST (10S/25S, EAST COAST/55E):
WIND : E to NE 05 to 15 in the south, otherwise E to SE 10 to 20,
reaching 25 in places in the northern parts.
VIS : Moderate in rain and showers in places in the north, otherwise
good.
SEA STATE: 3.0 to 4.0m in the southern parts, with SW swell.
MARION FORTIES EAST (40S/50S, 35E/50E):
WIND : W to SW 20 to 30, becoming S to SW 20 to 30 in the west from
mid-period while reaching 35 in the central parts that will
spread to the south-east by the end of the period.
VIS : Moderate to poor in rain and snow-showers.
SEA STATE: 5.0 to 6.0m, with W to SW swell.
AREA 2:
=======
MARINE METEOROLOGICAL BULLETIN FROM METEO-FRANCE/LA REUNION ON AREA ACK (AMSTERDAM-CROZET-KERGUELEN)
25/09/18 AT 1600UTC
AVERAGED WIND SPEED ON BEAUFORT SCALE. (Wind gusts may be about 40% stronger than the averages given here).
PART 1: WARNING
- Gale force 8 ongoing over CRO and expected over AMS, CRO and KER.
PART 2: GENERAL SYNOPSIS, 25/09/18 AT 1200UTC
- Cold front (CF) axis 49S/86E, 38S/72E, 30S/56E moving eastward at 15/20 kt.
- Slow-moving front (CG) axis 42S/62 39S/50 38S/36E, shifting slowly eastward.
PART 3: FORECAST FOR 24 HOURS FROM 25/09/18 at 1800UTC to 25/09/19 at 1800UTC
WAM (30S/40S, 50E/65E)
Rain, squalls and frontal showers, sometimes stormy (CF and CG).
WIND: westerly 4 to 6 from North to South, increasing 6/7, then setting
up SW 6/7 at the end of the period over western area.
SEA : very rough to high. Long south-westerly swell 4 to 6 m, crossed at
the end of the period with a rough to very rough SW wind-sea.
VISI: very poor in precipitations.
AMS (30S/40S, 65E/80E)
Rain, squalls and frontal showers, sometimes stormy (CF).
WIND: NW 4 to 6, increasing 6/7 locally 8 over far south-western area at
the end of the period.
SEA : moderate to very rough from north-east to south-west, locally high
over far south-western area. SW swell 3 to 5 m increasing to a long
SW swell 5/6 m at the end of the period.
VISI: poor to very poor in precipitations.
CRO (40S/50S, 50E/65E)
Rain, squalls and locally thundery frontal showers (CG). Snow showers.
WIND: Westerly 7/8, decreasing soon 6/7, then 5/6 at the end of the
period. At the end of the period over western area, SW wind 6/7,
locally 8.
SEA : high to very high, becoming very rough to high. Long westerly swell
7/8 m abating.
VISI: poor in precipitations.
KER (40S/50S, 65E/80E)
Rain, squalls and locally stormy frontal showers (CG). Snow showers.
WIND: W to NW 6 to 8 from North to South, decreasing NW 4 to 6 at the end
of the period.
SEA : very rough to high, temporarily very high over south-western area
at the beginning of the period. Long westerly swell, 6 to 8 m.
VISI: poor in precipitations.