COR SYNOPTIC CHART
WEATHER BULLETIN FOR THE HIGH SEAS FOR METAREA VII.
ISSUED BY THE SOUTH AFRICAN WEATHER SERVICE ON THE
20th OF AUGUST 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 201000 TO 211000 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 in the central south at first.
2. MARION FORTIES EAST: W to SW 35 to 40 in the north-east at first, becoming
W to NW 35 to 40 in the central parts from mid
period, spreading to the north by end of the period.
It will become SW 35 to 40 in the south-west towards
end of the period.
SYNOPTIC CHART 06:00Z
=====================
High 1028 hPa 33s09e.
Low 992 hPa 45s10w, Low 998 hPa 41s48e, Low 978 hPa 48s45e
1. Cold front: 30s19w 35s13w 39s11w into 45s10w
2. Cold front: 35s40e 40s49e into 41s48e
3. Cold front: 41s45e 46s47e into 48s45e
AREA FORECAST:
==============
ASCENSION (06S/15S, 00E/20W):
WIND : E to SE 10 to 20.
VIS : Good.
ANGOLA (06S/15S, 00E/00N):
WIND : S to SE 10 to 15 but SW 05 to 10 in the east where it will become
variable 05 to 10 towards the end of the period.
VIS : Good.
ST HELENA (15S/30S, 00E/20W):
WIND : E to SE 10 to 20 in the north, otherwise N to NW 15 to 25, but S
to SW 05 to 15 in the south-west.
VIS : Good but moderate in showers and rain in the south.
SEA STATE: 3.0m in the south-west and central south, reaching 3.5m in the
extreme south-west and extreme central south at first, with W to
SW swell.
TRADES (15S/30S, 00E/WEST COAST):
WIND : S to SE 10 to 20 but N to NW 05 to 15 in the extreme south-west,
while variable 05 to 10 in the extreme north-east.
VIS : Good.
SEA STATE: 3.0m in the south-east until mid-period, with S swell.
TRISTAN (30S/40S, 00E/20W):
WIND : N to NW 20 to 30 in the east until mid-period, reaching 35 in the
central south at first, otherwise W to SW 15 to 25.
VIS : Good, but moderate to poor in showers and rain in the central
south and east, clearing from the west from mid-period.
SEA STATE: 3.0 to 4.0m except in the north-east, reaching 5.0m in the central
south until mid-period, with W to NW swell.
CAPE WEST (30S/40S, 00E/20E):
WIND : N to NW 15 to 25 in the east, reaching 30 in the south-east from
mid-period, otherwise anticyclonic 10 to 20.
VIS : Good, but moderate in showers and rain in the east from mid-
period.
SEA STATE: 3.0 to 4.0m in the south-east as well as in the south-west from
mid-period, reaching 4.5m in the extreme south-east until mid
period, with SW swell, but NW in the south-west.
CAPE EAST (32.5S/40S, 20E/50E):
WIND : NW 15 to 25 in the extreme north-east at first, otherwise W to SW
15 to 25, reaching 30 in the extreme south-east at first as well
as over the south-east towards the end of the period.
VIS : Moderate in showers and rain, except over the north-west, but
moderate to poor in showers and thundershowers in the extreme
north-east until mid-period, otherwise good.
SEA STATE: 3.0 to 4.0m, reaching 4.5 to 5.5m in the south, subsiding from the
west from mid-period, with W to SW swell.
DURBAN EAST (32.5S/25S, EAST COAST/55E):
WIND : S to SE 15 to 25 in the north-west, otherwise variable 05 to 10,
but W 10 to 20 in the south-east.
VIS : Good, but moderate in showers and thundershowers in the east.
SEA STATE: 3.0 to 3.5m in the extreme west and south, S to SW swell.
MOZAMBIQUE CHANNEL:
WIND : S to SE 05 to 15.
VIS : Good.
MADAGASCAR EAST (10S/25S, EAST COAST/55E):
WIND : E to SE 10 to 20, but N to NE 05 to 15 in the south.
VIS : Good, but moderate in showers and rain in the north.
MARION FORTIES EAST (40S/50S, 35E/50E):
WIND : W to SW 20 to 30, reaching 35 to 40 in the north-east at first,
becoming W to NW 20 to 30 from the south-west from mid-period,
reaching 35 to 40 in the central parts, spreading to the north by
end of the period. It will become SW 30 to 40 in the south-west
towards end of the period.
VIS : Moderate to poor in showers and rain with snow showers in the
south.
SEA STATE: 5.0 to 6.0m, reaching 7.0 to 8.0m in places in the west from mid
period, spreading east by end of the period, with W to SW swell.
AREA 2:
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MARINE METEOROLOGICAL BULLETIN FROM METEO-FRANCE/LA REUNION ON AREA ACK (AMSTERDAM-CROZET-KERGUELEN)
26/08/20 AT 0600UTC
AVERAGED WIND SPEED ON BEAUFORT SCALE. (WIND GUSTS MAY BE ABOUT 40% STRONGER THAN THE AVERAGES GIVEN HERE).
PART 1: WARNING
- FORCE 8 GALE OVER WAM AND AMS.- STRONG GALE FORCE 9 GALE OVER KER.- STORM
FORCE 10 OVER CRO.
PART 2: GENERAL SYNOPSIS, 26/08/20 AT 0000UTC
- LOW-PRESSURE SYSTEM AT 982 HPA FILLING NEAR 47S/75E WITH AN ASSOCIATED COLD
FRONT AXIS 32S/65E, 35S/70E, 40S/77E AND 44S/80E, MOVING RAPIDLY EASTWARDS. - HIGH-PRESSURE SYSTEM 1023 HPA NEAR 35S/55E, SHIFTING SLOWLY TOWARDS THE
EAST.
PART 3: FORECAST FOR 24 HOURS FROM 26/08/20 AT 0600UTC TO 26/08/21 AT 0600UTC
WAM (30S/40S, 50E/65E)
RAIN AND FRONTAL SHOWERS WITH THE ARRIVAL OF A NEW COLD FRONT.
WIND: ANTICLOCKWISE 2/4 THEREAFTER, THEN FRESHENING NORTH-WESTERLY 6/7,
LOCALLY 8, AHEAD OF A NEW COLD FRONT; BACKING SOUTH-WESTERLY 4 TO 6
BEHIND OVERNIGHT.
SEA : ROUGH TO HEAVY, BECOMING HEAVY TO VERY HEAVY IN THE SOUTH-EAST. SOUTH-
WESTERLY SWELL OF 2 TO 3 METRES, INCREASING TO 3 TO 4 METRES.
VIS : POOR DURING RAINFALL.
AMS (30S/40S, 65E/80E)
RAIN AND FRONTAL SHOWERS ASSOCIATED WITH THE COLD FRONT, FOLLOWED BY A NEW FRONT TOWARDS THE END OF THE FORECAST PERIOD.
WIND: NORTH-WESTERLY 5 TO 7 AHEAD OF THE COLD FRONT, LATER VEERING SOUTH-
WESTERLY 5/6, LOCALLY 7/8 IN THE WAKE OF THE FRONT FROM THE SOUTH-WEST;
TEMPORARILY ANTICYCLONIC 3/4 OVER THE NORTHERN PART OF THE REGION, THEN FRESHENING NORTH-WESTERLY AGAIN TO 6 TO 8 AHEAD OF A NEW FRONT. RETURNING TO SOUTH-WESTERLY 4 TO 6 IN THE REAR OVER THE EXTREME SOUTH-WESTERN PART OF THE AREA TOWARDS THE END OF THE FORECAST PERIOD.
SEA : ROUGH TO VERY ROUGH FROM NORTH TO SOUTH. SOUTH-WESTERLY SWELL 3 TO 5 METRES.
VIS : POOR UNDER PRECIPITATION.
CRO (40S/50S, 50E/65E)
RAIN AND SHOWERS ASSOCIATED WITH THE ARRIVAL OF A NEW FRONT. SNOW IN THE SOUTH. STRONG GUSTS.
WIND: NORTH-WESTERLY 7/8, LOCALLY 9/10 AHEAD OF THE NEW FRONT; BACKING SOUTH
WESTERLY 6 TO 8, LOCALLY 9/10 BEHIND THE FRONT, EASING WESTERLY 4 TO 6
BY THE END OF THE PERIOD.
SEA : ROUGH TO VERY ROUGH. WESTERLY SWELL 3 TO 5 METRES.
VIS : VERY POOR DURING RAINFALL.
KER (40S/50S, 65E/80E)
RAIN, FRONTAL SHOWERS AND SQUALLS WITH THE COLD FRONT CF, FOLLOWED BY A NEW FRONT TOWARDS THE END OF THE FORECAST PERIOD. SNOW OVER SOUTHERN. VIOLENT GUSTS.
WIND: LOW-PRESSURE SYSTEM, FORCE 7/8, LOCALLY 9 OVER THE SOUTHERN; EASING TO
FORCE 6/7 FROM THE SOUTH-WEST BEHIND THE COLD FRONT, BUT FRESHENING N
FORCE 6 TO 8, LOCALLY 9, AHEAD OF A NEW FRONT BACKING FORCE 6 TO 8
BEHIND IT.
SEA : ROUGH TO VERY ROUGH, LOCALLY HIGH OVER SOUTHERN AREA. WESTERLY SWELL 5
TO 7 METRES.
VIS : VERY POOR DURING PRECIPITATION.