WEATHER BULLETIN FOR THE HIGH SEAS FOR METAREA VII.
ISSUED BY THE SOUTH AFRICAN WEATHER SERVICE ON THE
21ST OF JUNE 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:
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FORECAST VALID FROM 211000 TO 221000 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. TRISTAN: NW 35 in the south, but SW 35 in the south-west, drifting to the
south-east towards the end of the period.
2. CAPE WEST: SW 35 in the extreme south-west towards the end of the period.
3. MARION FORTIES EAST: SW 35 in the extreme south-east first and towards
the end of the period, but W to NW 35 in the south
until mid-period.
SYNOPTIC CHART 06:00Z
=====================
High 1026 41s08w, High 1033 hPa 34s42e
Low 964 hPa 48s18w, Low 1016 hPa 42s27e
1. Cold Front: 33s29w 40s17w 45s14w into 48s18w
2. Cold Front: 36s10e 40s23e into 42s27e
AREA FORECAST:
==============
ASCENSION (06S/15S, 00E/20W):
WIND : E to SE 05 to 15.
VIS : Good, but moderate in showers and rain in the west at first.
ANGOLA (06S/15S, 00E/00N):
WIND : S to SE 05 to 15, but SW 05 to 15 in the east.
VIS : Good.
ST HELENA (15S/30S, 00E/20W):
WIND : E to SE 05 to 15, but anticyclonic 05 to 15 in the south.
VIS : Good, but moderate in showers and rain in the south.
SEA STATE: 3.0 to 3.5m in the south and west at first, with S to SW swell.
TRADES (15S/30S, 00E/WEST COAST):
WIND : Variable 05 to 10 in the south, otherwise S to SE 05 to 15
reaching 20 in the extreme north-east at times.
VIS : Good.
TRISTAN (30S/40S, 00E/20W):
WIND : Variable 05 to 10 in the north and east at first, otherwise NW 15
to 25 reaching 30 to 35 in the south, but SW 25 to 35 in the
south-west, drifting to the south-east towards the end of the
period.
VIS : Good, but moderate in showers and rain in the south-west,
drifting to the central and south-eastern parts towards the end
of the period.
SEA STATE: 3.0 to 4.0m reaching 5.0 to 7.0m in the south-west, drifting to
the south-east towards the end of the period, with SW swell.
CAPE WEST (30S/40S, 00E/20E):
WIND : E to SE 05 to 15 in the south-east until mid-period, otherwise
variable 05 to 10. It will become N to NW 15 to 25 in the south-
west by mid-period, spreading to the south and west towards the
end of the period, while reaching 25 to 30 in the south-west, but
SW 25 to 35 in the extreme south-west towards the end of the
period.
VIS : Good, but moderate in showers and rain in the south and west,
spreading over the southern half by mid-period, and central parts
towards the end of the period.
SEA STATE: 3.0 to 3.5m in the south and west, reaching 4.0 to 5.0m in the
south-west towards the end of the period, with W to SW swell.
CAPE EAST (32.5S/40S, 20E/50E):
WIND : Anticyclonic 05 to 15 in the east, otherwise N to NW 10 to 20
reaching 25 in the north, but variable 05 to 10 in the west,
where it will become E to NE 10 to 20 towards the end of the
period.
VIS : Good, but moderate in showers and thundershowers in the south,
but in the west towards mid-period.
SEA STATE: 3.0 to 4.0m in the southern and eastern parts, with S to SW
swell.
DURBAN EAST (32.5S/25S, EAST COAST/55E):
WIND : E to SE 10 to 20 in the east, otherwise N to NE 10 to 20, but NW
05 to 15 in the extreme south-west, spreading to the extreme
north-west from mid-period.
VIS : Moderate in showers and thundershowers in places, becoming good
in the west towards mid-period.
SEA STATE: 3.0 to 4.0m reaching 4.5 to 5.5m in the east until mid-period,
with S to SW swell.
MOZAMBIQUE CHANNEL:
WIND : N to NE 05 to 15 in the south-west, otherwise S to SE 10 to 20,
reaching 25 in the north-east and south-east.
VIS : Good, but moderate in showers and rain in places in the northern
and south-western parts.
SEA STATE: 3.0 to 3.5m in the southern and central parts until towards the
end of the period, with S to SE swell.
MADAGASCAR EAST (10S/25S, EAST COAST/55E):
WIND : S to SE 15 to 25, reaching 30 in the extreme north-west towards
mid-period.
VIS : Moderate in showers and rain in places.
SEA STATE: 4.0 to 5.0m, subsiding to 3.0 to 3.5m towards the end of the
period, with S to SW swell.
MARION FORTIES EAST (40S/50S, 35E/50E):
WIND : SW 25 to 35 in the extreme south-east first and towards the end
of the period, otherwise W to NW 15 to 25 reaching 30 to 35 in
the south until mid-period.
VIS : Good, but moderate in showers and rain in the north.
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)
2026/06/21 AT 0600UTC
AVERAGED WIND SPEED ON BEAUFORT SCALE. (WIND GUSTS MAY BE ABOUT 40% STRONGER THAN THE AVERAGES GIVEN HERE).
PART 1: WARNING
- GALE OVER WAM, AMS, CRO AND KER.
PART 2: GENERAL SYNOPSIS, 2026/06/21 AT 0000UTC
- WAVING FRONT AXIS 29S/65E, 39S/72E, 42S/80E WITH LOW 991 HPA NEAR 48S/80E,
MOVING EASTWARD AND LOW 1004 HPA NEAR 34S/67E.
- HIGH 1032 HPA NEAR 34S/40E WITH A RIDGE EXTENDING EASTWARD.
PART 3: FORECAST FOR 24 HOURS FROM 2026/06/21 AT 0600UTC TO 2026/06/22 AT 0600UTC
WAM (30S/40S, 50E/65E)
RAIN AND FRONTAL SHOWERS. SQUALLS AT FIRST.
WIND: WESTERN HALF: SOUTHERLY 5/6, DECREASING GRADUALLY 4/5 FROM THE WEST
DURING THE PERIOD.
EASTERN HALF: SOUTHERLY 7/8, WITH VIOLENT GUSTS NEAR THE CENTER.
SEA : VERY ROUGH TO HIGH, ROUGH IN THE SOUTH THEN IN THE WEST LATER.
SOUTHWEST SWELL 3 TO 5 METERS, ABATING FROM THE SOUTH.
VIS : VERY POOR IN PRECIPITATION.
AMS (30S/40S, 65E/80E)
RAIN AND FRONTAL SHOWERS. SQUALLS.
WIND: WESTERN HALF: CLOCKWISE 4/5 BUT SOUTHERLY 7/8 OVER SOUTHWESTERN AREA
THEN OVER FAR WESTERN SOON.
EASTERN HALF: NORTHERLY 4/6 LOCALLY 7, BECOMING LATER CLOCKWIZE 4/6
OVER WESTERN AREA.
SEA : ROUGH, BUT MODERATE IN THE NORTHEAST, BECOMING VERY ROUGH TO HIGH
LATER IN THE FAR WEST. ARRIVAL OF CLOCWIZE SWELL 3 TO 5 METERS IN WEST
DURING THE DAY.
VIS : POOR TO VERY POOR IN PRECIPITATION.
CRO (40S/50S, 50E/65E)
SHOWERS.
WIND: NORTHERN HALF: WESTERLY 5/6 LOCALLY 7.
SOUTHERN HALF: WESTERLY 6/7 WITH VIOLENT GUSTS INCREASING 7/8 AT END
OVER FAR SOUTHERN AREA.
SEA : ROUGH TO VERY ROUGH, BECOMING HIGH IN THE SOUTHERN . SOUTHWEST SWELL 2
TO 4 METERS, INCREASING TO 4 TO 6 METERS OVER SOUTHERN.
VIS : POOR IN PRECIPITATION.
KER (40S/50S, 65E/80E)
RAIN AND FRONTAL SHOWERS OVER NORTH-EASTERN
WIND: NORTHERN HALF: VARIABLE ANTICLOCWIZE 2/4.
SOUTHERN HALF: WESTERLY 6/7, LOCALLY 8 WITH VIOLENT GUSTS.
SEA : ROUGH TO VERY ROUGH, BECOMING HIGH IN FAR SOUTHWEST AT END. SOUTHWEST
SWELL 2 TO 4 METERS, INCREASING TO 4 TO 6 METERS OVER SOUTH-WESTERN
LATER.
VIS : POOR TO VERY POOR IN PRECIPITATION.