WEATHER BULLETIN FOR THE HIGH SEAS FOR METAREA VII.
ISSUED BY THE SOUTH AFRICAN WEATHER SERVICE ON THE
21ST OF APRIL 2026 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 212200 TO 222200 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 north-east at first and in places in the
south-east.
2. CAPE EAST: N to NW 35 in places in the central-south at first.
3. DURBAN EAST: S to SW 35 in the west, drifting to the central parts from
mid-period until in the afternoon.
4. MARION FORTIES EAST: W to NW 35 in the north and eastern parts at first.
SYNOPTIC CHART 12:00Z
=====================
High 1024 hPa 35s02w, High 1024 hPa 35s73e
Low 976 hPa 51s30e
1. Cold Front: 32s13e 37s27e 42s32e 49s39e into 51s30e
AREA FORECAST:
==============
ASCENSION (06S/15S, 00E/20W):
WIND : E to SE 10 to 20.
VIS : Good, but moderate in showers and rain in the north at times.
ANGOLA (06S/15S, 00E/00N):
WIND : SW 05 to 15 in the south-east, otherwise S to SE 10 to 20.
VIS : Good.
SEA STATE: 3.0 to 3.5m in the south, with S to SW swell.
ST HELENA (15S/30S, 00E/20W):
WIND : N to NE 10 to 20 in the south-west, becoming NW 10 to 15 in the
extreme south-west from mid-period, otherwise E to SE 10 to 20.
VIS : Good, but moderate in showers and thundershowers in the south-
west.
TRADES (15S/30S, 00E/WEST COAST):
WIND : S to SE 15 to 25, reaching 30 to 35 in the north-east at first
and in places in the south-east.
VIS : Good.
SEA STATE: 3.0 to 4.0m in the central and eastern parts, reaching 4.5 to
5.0m in the south-east from afternoon, with S to SW swell.
TRISTAN (30S/40S, 00E/20W):
WIND : N to NW 15 to 25 over the central parts spreading to the east,
while reaching 30 in the south-east from mid-period, otherwise S
to SW 10 to 20.
VIS : Good, but moderate to poor in showers and thundershowers in the
western half, spreading to the south-east from mid-morning.
SEA STATE: 3.0 to 3.5m in the central and south-east, with W to NW swell.
CAPE WEST (30S/40S, 00E/20E):
WIND : W to SW 20 to 30 in the south-east until mid-period, but S to SE
15 to 25 in the north, otherwise anti-cyclonic 05 to 15. It will
become NW 15 to 25 in the south-west towards the end of the
period.
VIS : Moderate in showers and rain in the south-east at first,
otherwise, good.
SEA STATE: 3.0 to 4.0m reaching 5.0 to 6.0m in the south and east, but 7.0
to 8.0m in the south-east at first, with S to SW swell.
CAPE EAST (32.5S/40S, 20E/50E):
WIND : N to NW 15 to 25 in the central and east, reaching 30 to 35
places in the central-south at first, otherwise S to SW
20 to 30, becoming anti-cyclonic 05 to 15 in the west from
mid-period.
VIS : Moderate to poor in showers and thundershowers in the central and
southern parts, spreading to the east from mid-period, while
clearing in the west from the morning.
SEA STATE: 3.5 to 4.5m, in the central and eastern parts, but 5.0 to 6.0m in
places in the west, reaching 6.5 to 7.5 in the south-west until
mid-period, with W to SW swell.
DURBAN EAST (32.5S/25S, EAST COAST/55E):
WIND : N to NE 10 to 20, but S to SW 20 to 30 in the south-west,
spreading to the west and central from the morning, while
reaching 35 in the west, drifting to the central from mid-period
until in the afternoon.
VIS : Good, but moderate to poor in showers and thundershowers in
in the south-west at first drifting to the west from mid-morning
and to central parts towards the end of the period.
SEA STATE: 3.0 to 4.0m in places in the west and central parts, reaching 4.5
to 5.5m in the south-west from tomorrow morning, with S to SW
swell.
MOZAMBIQUE CHANNEL:
WIND : N to NE 10 to 15 in the west, becoming variable 05 to 10 from
mid-period, otherwise S to SE 10 to 20, reaching 25 to 30 in the
extreme south-west towards the end of the period.
VIS : Good.
SEA-STATE: 3.0 to 3.5m in the extreme south-west towards the end of the
period, with S to SW swell.
MADAGASCAR EAST (10S/25S, EAST COAST/55E):
WIND : E to NE 05 to 15 in the south, otherwise SE 10 to 20 reaching 25
in the extreme north-west.
VIS : Moderate in showers and thundershowers in places over the north
and central, otherwise good.
MARION FORTIES EAST (40S/50S, 35E/50E):
WIND : W to NW 15 to 25, reaching 30 to 35 in the north and eastern
parts at first, otherwise SW 15 to 25, reaching 30 in places over
the south and east towards the end of the period.
VIS : Good, but moderate to poor rain and showers in the central,
spreading to the east from mid-period.
SEA STATE: 3.5 to 4.5m, reaching 5.0 to 6.0m in west, spreading to the
central from mid-period, with W to NW swell.
AREA 2:
=======
MARINE METEOROLOGICAL BULLETIN FROM METEO-FRANCE/LA REUNION ON AREA
ACK (AMSTERDAM-CROZET-KERGUELEN)
26/04/21 AT 1600UTC
AVERAGED WIND SPEED ON BEAUFORT SCALE. (WIND GUSTS MAY BE ABOUT 40%
STRONGER THAN THE AVERAGES GIVEN HERE).
PART 1: WARNING
- NIL.
PART 2: GENERAL SYNOPSIS, 26/04/21 AT 1200UTC
- COLD FRONT OVER WESTERN CRO AXED NNW/SSE LOSING ITS IDENTITY.
- HIGH 1026HPA OVER WAM WITH RIDGE OVER AMS.
PART 3: FORECAST FOR 24 HOURS FROM 26/04/21 AT 1800UTC TO 26/04/22
AT 1800UTC
WAM (30S/40S, 50E/65E)
FEW SHOWERS BECOMING MORE FREQUENT AT END OVER FAR SOUTHWESTERN WITH
THE ARRIVAL OF A NEW FRONT.
WIND: N TO NW 3 TO 5 INCREASING NW 5 TO 6 WITH GUSTS OVER WESTERN
AREA AT END.
SEA: MODERATE BECOMING ROUGH OVER SOUTHWESTERN AT END.
VISIBILITY: GOOD, TEMPORARILY POOR WITH PRECIPITATION.
AMS (30S/40S, 65E/80E)
FEW SHOWERS.
WIND : ANTICLOCKWISE 2 TO 4.
SEA: MODERATE TO LOCALLY ROUGH OVER SOUTHEASTERN. S SWELL ABOUT 3M.
VISIBILITY: GOOD.
CRO (40S/50S, 50E/65E)
SCATTERED SHOWERS, THEN RAIN AND FRONTAL SHOWERS LATER.
WIND: NW 4 TO 5, BUT LOCALLY SW 2 TO 3 BEHIND CF, INCREASING NNW 5 TO
6, LOCALLY 7 WITH SEVERE GUSTS FROM WESTERN LATER.
SEA: MODERATE TO ROUGH FROM NORTH TO SOUTH, LOCALLY VERY ROUGH OVER
FAR SOUTHERN. W SWELL 2 TO 4 METERS OVER SOUTHERN.
VISIBILITY: POOR WITH PRECIPITATION.
KER (40S/50S, 65E/80E)
FEW SHOWERS.
WIND: NW 4 TO 6 FROM N TO S, TEMPORARILY DECREASING W 3 TO 4 LATER.
SEA: MODERATE TO VERY ROUGH FROM NW TO SE, BECOMING MODERATE TO ROUGH
SOON. SW SWELL 3 TO 4 METERS OVER EASTERN, ABATING SOON.
VISIBILITY: GOOD, TEMPORARILY POOR WITH PRECIPITATION.=