WEATHER BULLETIN FOR THE HIGH SEAS FOR METAREA VII.
ISSUED BY THE SOUTH AFRICAN WEATHER SERVICE ON THE
17TH OF JUNE 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 171220 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. TRISTAN : N to NW 35 to 40 in the west and south-west, spreading to
the south-east from mid-period.
2. CAPE EAST : W to SW 35 in the central south from mid-period.
3. MARION FORTIES EAST: W to NW 35 in the north and north-west.
SYNOPTIC CHART 12:00Z
=====================
High 1032 hPa 34s01e, High 1024 hPa 33s71e
Low 1012 hPa 29s28w, Low 996 hPa 52s13e, Low 964 hPa 60s70e.
1. Cold Front: 37s33e 40s45e 45s55e 50s65e into 60s70e.
2. Cold Front: 16s29w 21s29w 25s27w into 28s28e.
3. Cold Front: 38s06w 41s09e 49s22e 55s22e into 52s13e.
AREA FORECAST:
==============
ASCENSION (06S/15S, 00E/20W):
WIND : E to SE 15 to 25.
VIS : Good.
SEA STATE: 3.0 to 4.0m, with E to SE swell.
ANGOLA (06S/15S, 00E/00N):
WIND : SW 05 to 15 in the east, otherwise S to SE 10 to 20, reaching
25 to 30 in the south and south-east.
VIS : Good.
SEA STATE: 3.0 to 3.5m int the south-east, with SE swell.
ST HELENA (15S/30S, 00E/20W):
WIND : N to NE 15 to 25 in the west and south-west, otherwise E to SE
15 to 25.
VIS : Good, but moderate to poor in showers and thundershowers in
the extreme south-west.
SEA STATE: 3.0 to 4.0m, except in the south-east, with E to SE swell, but
NW in the south-west.
TRADES (15S/30S, 00E/WEST COAST):
WIND : S to SE 15 to 25, reaching 30 in the south-east.
VIS : Good, but moderate in thundershowers in the south-east.
SEA STATE: 3.0 to 3.5m, with SE swell.
TRISTAN (30S/40S, 00E/20W):
WIND : N to NW 15 to 25, reaching 30 to 40 in the west and south-
west, spreading to the south-east from mid-period.
VIS : Good, but moderate to poor in showers and thundershowers in
the west and southern parts, spreading to the north-west
towards mid-period.
SEA STATE: 3.0 to 4.0m, except in the north-east, reaching 4.5 to 5.0m in
the south-west, spreading to the central south during the
second half of the period, with NW swell.
CAPE WEST (30S/40S, 00E/20E):
WIND : NW 15 to 25 in the south-west, and SW 15 to 25 in the south-
east, otherwise S to SE 15 to 25.
VIS : Good, but moderate in showers and rain in places in the east
and south-east.
SEA STATE: 3.0 to 4.0m in the south-east with a SW swell, but SE in the
north-east.
CAPE EAST (32.5S/40S, 20E/50E):
WIND : W to SW 15 to 25, reaching 30 to 35 in the central south from
mid-period.
VIS : Moderate in showers and rain in places.
SEA STATE: 3.0 to 4.0m, reaching 5.0 to 6.0m in the central south and the
south-west, with SW swell.
DURBAN EAST (32.5S/25S, EAST COAST/55E):
WIND : Anticyclonic 05 to 15 in the west, and E to SE 10 to 15 in
the northern parts, otherwise W to SW 10 to 20.
VIS : Good, but moderate to poor in showers and thundershowers in
the east and south-east, but moderate in showers and rain in
the west.
SEA STATE: 3.0 to 3.5m in the south-east, with S to SW swell.
MOZAMBIQUE CHANNEL:
WIND : S to SE 05 to 15, reaching 20 to 25 in the south-east.
VIS : Good.
MADAGASCAR EAST (10S/25S, EAST COAST/55E):
WIND : Variable 05 to 10 in the south, otherwise E to SE 10 to 20,
reaching 25 in the extreme north-west.
VIS : Moderate in showers and rain in places.
MARION FORTIES EAST (40S/50S, 35E/50E):
WIND : SW 10 to 20 in the extreme east at first, otherwise W to NW 20
to 30 reaching 35 in the north and north-west. It will become
SE 20 to 30 in the west and south-west during the second half
of the period.
VIS : Good, but moderate in showers and rain in the southern half,
spreading to the north from the morning.
SEA STATE: 3.0 to 4.0m, reaching 5.0 to 5.5m in the north-west from mid-
period, with SW swell.
AREA 2:
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MARINE METEOROLOGICAL BULLETIN FROM METEO-FRANCE/LA REUNION ON AREA
ACK (AMSTERDAM-CROZET-KERGUELEN)
26/06/17 AT 1700UTC
AVERAGED WIND SPEED ON BEAUFORT SCALE. (WIND GUSTS MAY BE ABOUT 40%
STRONGER THAN THE AVERAGES GIVEN HERE).
PART 1: WARNING
- STRONG WINDS CURRENTLY AFFECTING KER AND CRO.
- STRONG WINDS EXPECTED OVER AMS.
PART 2: GENERAL SYNOPSIS, 26/06/17 AT 1200UTC
- COLD FRONT (CF) AXIS AT 28S/50E, 30S/55E, 36S/58E, 40S/58E.
- WARM FRONT (WF) OVER SOUTHERN CRO AND KER, AXIS 42S/55E, 45S/60E,
47S/65E, 48S/68E.
- HIGH-PRESSURE SYSTEM AT 1028 HPA NEAR 35S/75E, MOVING SLOWLY
EASTWARDS.
PART 3: FORECAST FOR 24 HOURS FROM 26/06/17 AT 1800UTC TO 26/06/18
AT 1800UTC
WAM (30S/40S, 50E/65E)
RAIN, SHOWERS AND FRONTAL SQUALLS, OCCASIONALLY THUNDEROUS. LOCALLY
THUNDEROUS SHOWERS BEHIND THE FRONT WITH CF.
WIND : NORTH 5 TO 7 AHEAD OF CF, VEERING SOUTH-WESTERLY 5/6 BEHIND,
OCCASIONALLY 7, FRESHENING NORTH-WESTERLY 5 TO 7 OVER THE SOUTH-WEST
TOWARDS THE END OF THE PERIOD. GUSTS.
SEA : ROUGH TO VERY ROUGH. SOUTH-WESTERLY SWELL OF AROUND 3 M,
SUBSEQUENTLY INCREASING TO AROUND 4 M OVER SOUTHERN.
VIS : POOR TO VERY POOR DURING PRECIPITATION.
AMS (30S/40S, 65E/80E)
SCATTERED SHOWERS. RAIN, SHOWERS AND FRONTAL SQUALLS, OCCASIONALLY
THUNDEROUS WITH LIGHTNING.
WIND : ANTICLOCKWISE 3/4, OCCASIONALLY 5, GRADUALLY FRESHENING NORTH
5 TO 7, LOCALLY 8, VEERING WEST 4 TO 6 BEHIND CF. GUSTS
SEA : ROUGH TO VERY ROUGH DUE TO SOUTH-WESTERLY SWELL OF 3 TO 4
METERS.
VIS : POOR TO VERY POOR DURING PRECIPITATION.
CRO (40S/50S, 50E/65E)
RAIN, SHOWERS AND FRONTAL SQUALLS WITH WF AND CF, FOLLOWED BY
OCCASIONAL SHOWERS BECOMING MORE FREQUENT OVER SOUTH-WESTERN AT THE
END OF THE FORECAST PERIOD. SNOW SHOWERS OVER FAR SOUTHERN.
WIND : NORTH-WESTERLY 6 TO 7 AHEAD OF THE CF, VEERING SOUTH-WESTERLY
TO SOUTHERLY 5/6 BEHIND, OCCASIONALLY 7. GUSTS. FRESHENING TO NORTH 5
TO 7 IN THE WEST TOWARDS THE END OF THE FORECAST PERIOD.
SEA : ROUGH TO VERY ROUGH DUE TO A SOUTH-WESTERLY SWELL OF 2 TO 4 M,
GRADUALLY SUBSIDING.
VIS : POOR TO VERY POOR DURING PRECIPITATION.
KER (40S/50S, 65E/80E)
LIGHT RAIN AND FRONTAL SHOWERS OVER SOUTHERN WITH WF, THEN WITH CF
WIND : NORTH-WESTERLY 5/6, OCCASIONALLY 7, FRESHENING SECTEUR
NORTH-WESTERLY 7/8 BEHIND WF AND THEN AHEAD OF CF, THEN VEERING
SOUTHERLY 5/6 BEHIND. GUSTS.
SEA : ROUGH TO VERY ROUGH. SWELL FROM THE WEST, 4 TO 6 M. CROSS SEAS
AT THE CF.
VIS : POOR TO VERY POOR DURING RAINFALL.