METAREA 7 bulletinset


HIGH SEAS FORECAST
FQZA31 FAPR 190830

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.

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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:

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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

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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:

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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:

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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.