WEATHER BULLETIN FOR THE HIGH SEAS FOR METAREA VII.
ISSUED BY THE SOUTH AFRICAN WEATHER SERVICE ON THE
19TH OF MAY 2025 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 191000 TO 201000 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. TRADES: S to SW 35 in the south and south-west during the second half
of the period.
2. CAPE WEST: W to NW 35 over the central parts becoming SW during the
second half of the period.
3. CAPE EAST: N to NE 35 in the central south, spreading to the south-
east towards end of the period.
4. MARION FORTIES EAST: N to NE 35 in the extreme western half towards
mid-period, drifting to the central parts during
the second half of the period.
SYNOPTIC CHART 06:00Z
=====================
High 1026 hPa 30s25w, High 1024 hPa 39s18w, High 1030 hPa 43s43e.
Low 984 hPa 53s15e, Low 972 hPa 65s01e.
1. Cold Front: 32s16e 36s21e 40s27e 45s25e into 53s15e
2. Cold Front: 30s08w 35s0e 40s05e 45s10e into 65s01e
AREA FORECAST:
==============
ASCENSION (06S/15S, 00E/20W):
WIND : E to SE 10 to 20, reaching 25 in the north-west, spreading to
the south-west by mid-period.
VIS : Good, but moderate in light rain in the west and south-west.
SEA STATE: 3.0m in the west in the second half of the period, with SE
swell.
ANGOLA (06S/15S, 00E/00N):
WIND : W to SW 05 to 15 in the east, otherwise S to SE 10 to 20.
VIS : Good, but moderate in showers and thundershowers over the
north-east.
ST HELENA (15S/30S, 00E/20W):
WIND : SW 10 to 20 in the south-east, otherwise S to SE 10 to 20,
reaching 25 in the northern parts towards mid-period.
VIS : Good in the north-east, otherwise moderate in showers
and rain in places.
SEA STATE: 3.0m in the south-east from mid-period, with SW swell.
TRADES (15S/30S, 00E/WEST COAST):
WIND : Variable 05 to 10 in the south-east at first, otherwise, S to
SW 10 to 20, reaching 25 to 30 in the south and south-west
towards mid-period and 35 during the second half of the
period.
VIS : Good, but moderate in light rain in the extreme south-
West.
SEA STATE: 3.0m in the south-west from mid-period, reaching 3.5 to 4.5m
during the second half of the period, with SW swell.
TRISTAN (30S/40S, 00E/20W):
WIND : S to SW 10 to 20, reaching 25 to 30 in the eastern half in the
first half of the period, otherwise anticyclonic 05 to 15.
VIS : Good, but moderate in light showers and rain in places in the
eastern parts during the first half of the period.
SEA STATE: 3.0 to 3.5m in the east and southern parts, reaching 4.5 to
5.0m in the south-east, with SW swell.
CAPE WEST (30S/40S, 00E/20E):
WIND : W to NW 15 to 25 in the eastern parts during the first half of
the period, while reaching 30 to 35 over the central parts,
otherwise, SW 20 to 30 reaching 35 in the central parts mainly
in the second half of the period.
VIS : Good in the north-east, otherwise moderate to poor in showers
and thundershowers in places, spreading to the north-east
during the second half of the period.
SEA STATE: 3.0 to 4.0m the west, and southern parts, reaching 4.5 to 5.5m
in the south-west, spreading to the west from mid-period, with
W to SW swell.
CAPE EAST (32.5S/40S, 20E/50E):
WIND : W to NW 15 to 20 in the extreme west, reaching 25 to 30 during
the second half of the period, otherwise N to NE 15 to 25,
reaching 30 to 35 in the central south, spreading to the
south-east towards end of the period. It will become SW 20 to
30 in the south-west towards end of the period.
VIS : Good, but moderate to poor in showers and thundershowers
in the west and central parts, spreading to the south-eastern
parts towards end of the period.
SEA STATE: 3.0 to 4.0m except in the north-west, with NE to E swell but W
to SW swell in the west and SE in the south-east at first.
DURBAN EAST (32.5S/25S, EAST COAST/55E):
WIND : N to NE 10 to 20 in the west, reaching 25 to 30 in the south-
west at times, but variable 05 to 10 in the north-east,
otherwise, S to SE 05 to 15, reaching 20 to 30 in the south
and south-east, spreading to the east in the second half of
the period.
VIS : Good, but moderate to poor showers and thundershowers in
places in the south and eastern parts.
SEA STATE: 3.0 to 4.0m in the south and south-east, with SE swell.
MOZAMBIQUE CHANNEL:
WIND : E to NE 05 to 15 in the south-west, reaching 20 by mid-period,
otherwise, S to SE 05 to 15 reaching 20 in the north-west at
times.
VIS : Good, but moderate in showers and thundershowers in the north
at times.
MADAGASCAR EAST (10S/25S, EAST COAST/55E):
WIND : E to SE 10 to 20, but variable 05 to 10 in the south.
VIS : Good, but moderate in showers and thundershowers in places in
the north and south-west.
MARION FORTIES EAST (40S/50S, 35E/50E):
WIND : S to SW 15 to 25 in the east and south-east, but N to NE 20 to
30 in the extreme western half, reaching 35 towards mid-
period. These conditions will drift to the eastern half during
the second half of the period, while reaching 35 in the
central parts.
VIS : Good, but moderate to poor in showers and thundershowers
in the extreme western half, drifting to the eastern half
during the second half of the period.
SEA STATE: 3.0 to 4.0m with SW swell but 4.5 to 5.0m in the western parts
with N to NW swell, spreading to the central parts towards
mid-period.
AREA 2:
=======
MARINE METEOROLOGICAL BULLETIN FROM METEO-FRANCE/LA REUNION ON AREA ACK (AMSTERDAM-CROZET-KERGUELEN)
25/05/19 AT 0600UTC
AVERAGED WIND SPEED ON BEAUFORT SCALE. (WIND GUSTS MAY BE ABOUT 40%
STRONGER THAN THE AVERAGES GIVEN HERE).
PART 1: WARNING
- GALE FORCE 8 RUNNING OVER EASTERN KER.
PART 2: GENERAL SYNOPSIS, 25/05/19 AT 0000UTC
- COLD FRONT AXIS 43S/80E, 37S/65E, 33S/43E MOVING SLOWLY
NORTHEASTWARD
- HIGH 1031 NEAR 43S/43E, FORECAST 1032 NEAR 41S/53E AT END
PART 3: FORECAST FOR 24 HOURS FROM 25/05/19 AT 0600UTC TO 25/05/20 AT
0600UTC
WAM (30S/40S, 50E/65E)
FRONTAL SHOWERS AND SQUALLS OVER NORTHEASTERN.
WIND : NW 4/5 OVER FAR NORTHEASTERN AT START. SOUTHEASTERLY 5/6
ELSEWHERE, INCREASING 6/7 OVER FAR NORTHEASTERN AT END BUT
DECREASING ANTICLOCKWISE 3/4 OVER SOUTHERN.
SEA : ROUGH TO VERY ROUGH, LONG SW SWELL 4 TO 5 M OVER SOUTHEASTERN,
DECREASING 3 TO 4 M.
VIS : POOR IN PRECIPITATIONS.
AMS (30S/40S, 65E/80E)
FRONTAL RAIN, SHOWERS AND SQUALLS.
WIND : NW 4/5 AHEAD OF FRONT, TEMPORARY 6/7 OVER EASTERN AT START.
SOUTHERLY 4 TO 6 FROM SOUTHERN TO NORTHERN BEHIND THE FRONT, AT
TIMES 7 OVER FAR NORTHWESTERN AT END.
SEA : ROUGH TO VERY ROUGH, LOCALLY HIGH OVER FAR SOUTHEASTERN AT
START. LONG SW SWELL 4 TO 6M OVER SOUTHERN.
VIS : POOR IN PRECIPITATIONS.
CRO (40S/50S, 50E/65E)
SCATTERED SHOWERS, SNOW OVER FAR SOUTHERN.
WIND : SW 4 TO 7 FOR NORTHWEST TO SOUTHEAST, BECOMING ANTICLOCKWISE
2/4 OVER NORTHWESTERN.
SEA : VERY ROUGH, AT TIMES HIGH OVER FAR SOUTHEASTERN AT START,
BECOMING ROUGH BY WESTERN. SW SWELL 4 TO 5 M DECREASING 3 TO 4 M.
VIS : POOR IN PRECIPITATIONS.
KER (40S/50S, 65E/80E)
FRONTAL RAIN AND SHOWERS OVER FAR NORTHEASTERN, SCATTERED SHOWERS
ELSWHERE WITH SNOW OVER FAR SOUTHERN.
WIND : SW 6/7, TEMPORARY 8 OVER EASTERN AT START.
SEA : VERY ROUGH TO HIGH, AT TIMES VERY HIGH OVER FAR SOUTHEAT AT
START. SW SWELL 5 TO 6 M.
VIS : POOR IN PRECIPITATIONS.