WEATHER BULLETIN FOR THE HIGH SEAS FOR METAREA VII.
ISSUED BY THE SOUTH AFRICAN WEATHER SERVICE ON THE
17TH 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:
=======
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. CAPE WEST: S to SW 35 in the south-east at first.
2. CAPE EAST: NW to W 35 to 40 in the west at first, becoming SW to S
35 in the south-west spreading eastwards by end of period.
3. MARION FORTIES EAST: NW 35 in the extreme north-west from mid-period
spreading to the central and south-east by end of
period.
SYNOPTIC CHART 12:00Z
=====================
High 1029 hPa 44s17w, High 1023 hPa 44s50e
Low 1005 hPa 40s17e, Low 996 hPa 44s22e, Low 1003 hPa 34s28e
1. Cold front: 29s16e 32s18e 34s19e 39s21e into 44s22e
AREA FORECAST:
==============
ASCENSION (06S/15S, 00E/20W):
WIND : E to SE 10 to 20.
VIS : Good, but moderate in showers and thundershowers in the north
until mid-period.
ANGOLA (06S/15S, 00E/00N):
WIND : S to SE 10 to 20, but SW 05 to 10 in the east.
VIS : Good.
SEA STATE: 3.0m in the south-east, until mid-period, with S
to SW swell.
ST HELENA (15S/30S, 00E/20W):
WIND : S to SE 10 to 20 in the east, otherwise E to NE 10 to 20 reaching
25 in the south-west becoming NW 05 to 10 in the extreme south-
west.
VIS : Good but moderate in showers and thundershowers in the western
parts becoming poor at times in the south-west.
SEA STATE: 3.0 to 3.5m in the south-west and south-east at first, with NE
swell in the south-west, otherwise S to SE in the south-east.
TRADES (15S/30S, 00E/WEST COAST):
WIND : SW 15 to 25 in the south, otherwise S to SE 10 to 20,
reaching 25 in the north-east at times, moderating towards
end of period.
VIS : Good.
SEA STATE: 3.0 to 4.0m in the southern parts, spreading to the central parts
towards mid-period, with S to SW swell.
TRISTAN (30S/40S, 00E/20W):
WIND : Anticyclonic 05 to 10 in the central until mid-period where it
will become SE 05 to 10, otherwise NE 20 to 25, reaching 30 in
the south-west but S to SW 10 to 20 in the east, reaching 25 to
30 in the south-east.
VIS : Good, but moderate to poor in thundershowers and rain in the
west while clearing in the north-west towards end of period.
SEA STATE: 3.0 to 4.0m in the west and east, reaching 4.5 to 5.0 in the
extreme south-east towards end of period, with NE swell in the
west, otherwise SW to S in the east.
CAPE WEST (30S/40S, 00E/20E):
WIND : S to SW 10 to 20 reaching 25 to 30 in the east and south, but 35
in the south-east at first, becoming W to NW 25 to 35 in the
central-south towards mid-period when it will spread to the
south-east.
VIS : Good, but moderate to poor in thundershowers and rain in the
east, and again in the central-south from 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 south-east
while moving eastwards it will become 4.0 to 6.0m in the south-
west by mid-period, with S to SW swell.
CAPE EAST (32.5S/40S, 20E/50E):
WIND : N to NE 20 to 30, but NW to W 20 to 30 in the west, where
it will reach 35 to 40 until mid-period, becoming SW to S
25 to 35 in the south-west spreading eastwards by end of period.
It will become NW 20 to 30 in the extreme west at the end of
period.
VIS : Good, but moderate to poor in showers and thundershowers in the
west spreading to the central parts by mid-period and again in
the west at the end of the period.
SEA STATE: 3.0 to 4.0m in the central and west, reaching 5.0 to 6.0 in the
north-west until mid-period, with SW swell.
DURBAN EAST (32.5S/25S, EAST COAST/55E):
WIND : E to NE 10 to 20, reaching 25 to 30 in the west until mid-period,
becoming S to SW 15 to 25 in the south-west until mid-period
where it will become SE 10 to 15.
VIS : Good, but moderate to poor in showers and thundershowers in
places in the south-west spreading to the central parts from mid-
period.
SEA STATE: 3.0 to 4.0m in the west, with SW swell.
MOZAMBIQUE CHANNEL:
WIND : Variable 05 to 10 in the central parts, otherwise E to NE 10 to
20, but S to SE 05 to 15 in the south-east from mid-period.
VIS : Good.
MADAGASCAR EAST (10S/25S, EAST COAST/55E):
WIND : E to SE 05 to 15 but NE 05 to 15 in the south-west.
VIS : Good, but moderate in showers and thundershowers in places in the
north-east and south-west at times.
MARION FORTIES EAST (40S/50S, 35E/50E):
WIND : N to NE 10 to 20, but NW to W 10 to 20 in the west, reaching 25
to 35 in the extreme west from mid-period spreading to the
central and south-east by end of period.
VIS : Good, but moderate in showers and rain in the west spreading to
the south-east towards end of period when it will reach 35 in the
extreme south-east.
SEA STATE: 3.0 to 4.0m except in the north-east, with W to NW swell.
AREA 2:
=======
MARINE METEOROLOGICAL BULLETIN FROM METEO-FRANCE/LA REUNION ON AREA
ACK (AMSTERDAM-CROZET-KERGUELEN)
26/04/17 AT 1600UTC
AVERAGED WIND SPEED ON BEAUFORT SCALE. (WIND GUSTS MAY BE ABOUT 40%
STRONGER THAN THE AVERAGES GIVEN HERE).
PART 1: WARNING
- GALE RUNNING OVER KER.
PART 2: GENERAL SYNOPSIS, 26/04/17 AT 1200UTC
- FLAT LOW OVER NORTHERN WAM, WITH ASSOCIATED SQUALLY WEATHER OVER
EASTERN WAM
- HIGH 1026 OVER AMS, SLOW-MOVING.
- HIGH 1023 OVER WESTERN CRO, FORECAST 1027 OVER WESTERN KER AT END.
- WAVING FRONT ALONG 43S OVER CRO AND KER AT START, DISSIPATING.
PART 3: FORECAST FOR 24 HOURS FROM 26/04/17 AT 1800UTC TO 26/04/18
AT 1800UTC
WAM (30S/40S, 50E/65E)
SHOWERS AND SQUALLS AT TIMES THUNDERY.OVER EASTERN HALF.
WIND: CLOCKWISE 3/5, GUSTS IN SQUALLS.
SEA: MODERATE, LOCALLY ROUGH OVER NORTH-EASTERN AT START.
VISI: VERY POOR IN PRECIPITATION.
AMS (30S/40S, 65E/80E)
SHOWERS AND SQUALLS AT TIMES THUNDERY OVER FAR WESTERN SOON.
WIND: ANTICLOCKWISE 3/5, GUSTS IN SQUALLS OVER FAR WESTERN.
SEA: MODERATE, LOCALLY ROUGH OVER FAR SOUTHEASTERN.
VISI: VERY POOR IN PRECIPITATION.
CRO (40S/50S, 50E/65E)
FRONTAL RAIN AND SHOWERS OVER NORTHERN AT START AND FAR SOUTHWESTERN
AT END.
WIND: ANTICLOCKWISE 3/5, AT TIMES 6 OVER SOUTHEASTERN. INCREASING
NORTHERLY 6/7 OVER FAR WESTERN AT END.
SEA: MODERATE TO ROUGH FROM NORTH TO SOUTH
VISI: POOR IN PRECIPITATION.
KER (40S/50S, 65E/80E)
FRONTAL RAIN AND SHOWERS AT START OVER NORTHERN, SHOWERS OVER
SOUTHEASTERN.
WIND: SW 5/6 BUT 7/8 OVER SOUTHEASTERN WITH GUSTS. BECOMING
ANTICLOCKWISE 3/4 OVER NORTH-WESTERN SOON.
SEA: MODERATE TO VERY ROUGH FROM NORTHWEST TO SOUTHEAST. LONG SW
SWELL 4 TO 5M OVER FAR SOUTHEASTERN.
VISI: POOR IN PRECIPITATION.=