WEATHER BULLETIN FOR THE HIGH SEAS FOR METAREA VII.
ISSUED BY THE SOUTH AFRICAN WEATHER SERVICE ON THE
18th OF JULY 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 182200 TO 192200 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: W to SW 35 to 40 in places over the south-central and
south-eastern parts towards mid-period.
2. CAPE EAST: Cyclonic 35 in the north-west by mid-period. It will become
W to SW 35 in the north-west by the end of the period.
3. MARION FORTIES EAST: S to SE 35 in the north-east first.
SYNOPTIC CHART 12:00Z
=====================
High 1031 hPa 33s22w, High 1026 hPa 46s33e
Low 1007 hPa 40s11e, Low 988 hPa 38s46e
1. Cold Front: 33s05e 34s06e 37s11e 39s12e into 40s11e
2. Cold Front: 30s48e 31s50e 35s54e 40s51e into 38s46e
AREA FORECAST:
==============
ASCENSION (06S/15S, 00E/20W):
WIND : E to SE 05 to 15.
VIS : Good.
ANGOLA (06S/15S, 00E/00N):
WIND : S to SW 05 to 10 in the east, otherwise SE 05 to 10.
VIS : Good.
ST HELENA (15S/30S, 00E/20W):
WIND : S to SE 10 to 20, reaching 25 in some places over the central
and west but variable 05 to 15 in the north-east.
VIS : Good but moderate in showers and thundershowers in the north-
west across the central to the south-eastern parts.
SEA STATE: 3.0m in the central and south, with S to SW swell.
TRADES (15S/30S, 00E/WEST COAST):
WIND : Variable 05 to 15 in the south-west, otherwise S to SE 05 to
15.
VIS : Good.
TRISTAN (30S/40S, 00E/20W):
WIND : Anti-cyclonic 10 to 15 in the north, otherwise W to NW 15 to
25, reaching 30 in the extreme south-west towards the end of
the period.
VIS : Good becoming moderate in showers and thundershowers in the
south-west towards the end of the period.
SEA STATE: 3.0 to 4.0m in the south, with W to SW swell.
CAPE WEST (30S/40S, 00E/20E):
WIND : N to NW 10 to 20 in the east until where it will reach 25 to
30 until mid-period, otherwise W to SW 15 to 25, reaching 30
to 40 in places over the south-central and south-eastern parts
towards mid-period but anticyclonic 05 to 15 in the west
spreading to the central after mid-period.
VIS : Moderate in showers and rain the central and south-
east parts until mid-period, otherwise good.
SEA STATE: 3.0 to 4.0m except over the north and west, reaching 4.5 to
5.5 with S to SW swell.
CAPE EAST (32.5S/40S, 20E/50E):
WIND : Cyclonic 15 to 25 in the west, spreading to the central from
mid-period, reaching 30 to 35 in the north-west by mid-period,
otherwise S to SE 10 to 20, reaching 25 to 30 in the south-
east at first. It will become W to SW 15 to 25 over the west
towards the end of the period, reaching 30 to 35 in the north-
west by the end of the period.
VIS : Good but moderate to poor in showers and thundershowers in
places except the north, clearing over the east from mid-
period.
SEA STATE: 3.0 to 4.0m, reaching 4.5 to 5.5m in the central and eastern
parts but 6.0 to 8.0m over the extreme east at first,
with W to SW swell but E to SE swell over the eastern parts.
DURBAN EAST (32.5S/25S, EAST COAST/55E):
WIND : N to NW 05 to 15 over the north-west, otherwise W to SW 10 to
20 reaching 25 over some places in the central. It will become
S to SE 05 to 15 over the south-central parts towards the end
of the period.
VIS : Good but moderate to poor in showers and thundershowers
in the south-central, spreading to the south-east from mid-
period.
SEA STATE: 3.0 to 4.0m, reaching 4.5 to 6.0m in the south and east until
mid-period, with S to SW swell.
MOZAMBIQUE CHANNEL:
WIND : S to SE 10 to 20 in the northern and eastern parts, otherwise
variable 05 to 10, spreading to the south-east but N to NW 05
to 15 in the south-west towards the end of the period.
VIS : Good.
MADAGASCAR EAST (10S/25S, EAST COAST/55E):
WIND : S to SE 05 to 15 but variable 05 to 10 in the south.
VIS : Good.
MARION FORTIES EAST (40S/50S, 35E/50E):
WIND : S to SE 15 to 25 in the north-east, where it will reach 30 to
35 at first, otherwise anti-cyclonic 10 to 20. It will become
W to NW 15 to 25 in the south-west towards mid-period.
VIS : Moderate to poor in showers and thundershowers in the
north-east at first and over the south-west towards the end of
the period, otherwise good.
SEA STATE: 3.0 to 4.0m, reaching 5.0 to 7.0m in the north until mid-
period, with S to SE swell but SW swell in the south.
AREA 2:
=======
MARINE METEOROLOGICAL BULLETIN FROM METEO-FRANCE/LA REUNION ON AREA
ACK (AMSTERDAM-CROZET-KERGUELEN)
26/07/18 AT 1700UTC
AVERAGED WIND SPEED ON BEAUFORT SCALE. (WIND GUSTS MAY BE ABOUT 40%
STRONGER THAN THE AVERAGES GIVEN HERE).
PART 1: WARNING
- GALE CONTINUING OVER WAM
- SEVERE GALE CONTINUING OVER CRO.
PART 2: GENERAL SYNOPSIS, 26/07/18 AT 1200UTC
- DEEPENING LOW 988 NEAR 39S/49E STEADILY MOVING ESE, EXPECTED 983
NEAR 41S/59E THE 19 AT 12 UTC.
- COLD FRONT AXIS 41S/50E, 38S/55E, 33S/52E, 30S47E MOVING EASTWARD.
- WARM FRONT AXIS 41S50E, 42S55E, 40S61E MOVING ESE.
- COLD FRONT AXIS 37S67E, 39S77E, 41S83E MOVING EASTWARD.
- HIGH 1025 NEAR 32S/90E, BUILDING.
- HIGH 1028 NEAR 46S/35E, WEAKENING.
PART 3: FORECAST FOR 24 HOURS FROM 26/07/18 AT 1800UTC TO 26/07/19
AT 1800UTC
WAM (30S/40S, 50E/65E)
RAIN AND SHOWERS, MORE FREQUENT IN THE SOUTH.
WIND: WEST TO NORTHWEST 5 TO 6 ON NORTH AREA, IN THE SOUTH CLOCKWISE
6 TO 7 AT TIMES 9, WITH SEVERE GUSTS.
SEA: BECOMING VERY ROUGH OR HIGH OVER WEST.
VISI: POOR OR VERY POOR IN PRECIPITATION.
AMS (30S/40S, 65E/80E)
RAIN AND SHOWERS.
WIND: PREVAILING NORTH 4 TO 6 LOCALLY 7 ON THE FAR SOUTHWEST AT THE
END.
SEA: MODERATE OR ROUGH. SOUTHWEST SWELL FROM 1.50 M TO 2.50 M
VISI: POOR IN PRECIPITATION.
CRO (40S/50S, 50E/65E)
HEAVY RAIN AND THUNDERY SHOWERS OVER NORTH.
WIND:
NORTHERN HALF: CLOCKWISE 7 OR 8, AT TIMES 9. SEVERE GUSTS.
SOUTHERN HALF: SOUTHEAST 3 TO 6 OR EVEN 7 TOWARDS THE END, FROM
SOUTH TO NORTH.
SEA: BECOMING ROUGH OR VERY ROUGH, LOCALLY HIGH IN THE NORTH.
SOUTHWESTERLY SWELL IN THE SOUTHERN PART OF THE AREA 2M TO 3 M.
VISI: VERY POOR IN PRECIPITATION.
KER (40S/50S, 65E/80E)
RAIN AND SHOWERS ACROSS THE NORTHERN HALF OF THE COUNTRY.
WIND :
IN THE SOUTHERN PART OF THE AREA: WESTERLY 5 TO 7, BECOMING SOUTHERLY
3 TO 4
ELSEWHERE, ANTICYCLONIC 2 TO 4, VEERING EAST TO NORTH 5 TO 6, LOCALLY
7 WITH GUSTS.
SEA: ROUGH TO VERY ROUGH IN THE SOUTH. WEST TO SOUTHWEST SWELL 2 TO 4
METRES FROM NORTH TO SOUTH.
VISI: POOR IN PRECIPITATION.=