Bulletinset for METAREA 7 Edition date (UTC): 2025-04-17 09:43:06 ============================ HIGH SEAS FORECAST ============================ FQZA31 FAPR 170830 WEATHER BULLETIN FOR THE HIGH SEAS FOR METAREA VII. ISSUED BY THE SOUTH AFRICAN WEATHER SERVICE ON THE 17TH OF APRIL 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: ======= FORECAST VALID FROM 171000 TO 181000 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 EAST: S to SE 35 to 45 in the north and north-east. 2. DURBAN EAST: Cyclonic 40 to 50 in the south. SYNOPTIC CHART 06:00Z ===================== High 1024 hPa 35s08e, High 1028 hPa 42s28e Low 969 hPa 63s05e, Low 1000 hPa 31s40e 1. Cold Front: 33s21w 40s09w 45s04w 50s00w 55s02e into 63s05e AREA FORECAST: ============== ASCENSION (06S/15S, 00E/20W): WIND : E to SE 10 to 20. VIS : Good, but moderate in light rain in places in the north. ANGOLA (06S/15S, 00E/00N): WIND : S to SE 05 to 15, but SW 05 to 15 in the east. VIS : Good, but moderate in showers and thundershowers in the north-east at times. ST HELENA (15S/30S, 00E/20W): WIND : N to NE 05 to 15 in the west, otherwise E to SE 10 to 20, but variable 05 to 10 in the south-east at first. VIS : Good, but moderate to poor in showers and thundershowers in the south and south-west. TRADES (15S/30S, 00E/WEST COAST): WIND : S to SE 10 to 20, reaching 25 in the extreme north-east at times, but variable 05 to 10 in the extreme east. VIS : Good. SEA STATE: 3.0 to 3.5m in the south-east, with S to SE swell. TRISTAN (30S/40S, 00E/20W): WIND : W to NW 10 to 20, but variable 05 to 10 in the north and west. VIS : Good, but moderate in showers and rain in the east and north- west. SEA STATE: 3.0 to 3.5m in the south-west but in the south-east at first, with W to SW swell. CAPE WEST (30S/40S, 00E/20E): WIND : W to NW 10 to 20 in the south-west, otherwise S to SE 10 to 20, but E to NE 15 to 25 in the south-east. VIS : Good, but moderate in showers and rain in south and west. SEA STATE: 3.0 to 3.5m in the east and north-east, with S to SW swell. CAPE EAST (32.5S/40S, 20E/50E): WIND : E to NE 20 to 30 in the west, otherwise S to SE 15 to 25 reaching 35 to 45 in the north and north-east. VIS : Moderate in showers and thundershowers in places, but poor to very poor in heavy rain and thundershowers in the north and north-east. SEA STATE: 3.0 to 3.5m, reaching 4.0 to 5.0m in the central parts with S to SW swell, but 5.5 to 6.5m in the north and north-east with SE swell. DURBAN EAST (32.5S/25S, EAST COAST/55E): WIND : S to SW 10 to 20 in the extreme west until mid-period, otherwise S to SE 15 to 25 but Cyclonic 40 to 50 in the south, but N to NE 10 to 20 in the east, and in the extreme south- west towards the end of the period. VIS : Moderate in showers and rain in the extreme west, but poor to very poor in heavy rain and thundershowers in the south. SEA STATE: 3.0 to 4.0m in the south-west, reaching 5.0 to 7.0m in the south, with S to SW swell. MOZAMBIQUE CHANNEL: WIND : SE 05 to 15, but S to SW 10 to 20 in the southern half, reaching 30 in the south-west. VIS : Good, but moderate to poor in showers and thundershowers in the northern and central parts. SEA STATE: 3.0 to 4.0m in the south towards mid-period, with S to SW swell. 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 : Moderate in showers and thundershowers in places. MARION FORTIES EAST (40S/50S, 35E/50E): WIND : S to SE 15 to 25 in the north, otherwise SW 15 to 25 reaching 30 in the south-east until mid-period. It will become NW 15 to 25 in the south-west from mid-period. VIS : Good. SEA STATE: 5.0 to 6.0m reaching 7.0 to 8.0m in the south-east at first, with SW swell. AREA 2: ======= MARINE METEOROLOGICAL BULLETIN FROM METEO-FRANCE/LA REUNION ON AREA ACK (AMSTERDAM-CROZET-KERGUELEN) 2025/04/17 AT 0500UTC 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 CRO. PART 2: GENERAL SYNOPSIS, 25/04/17 AT 0000UTC - SQUALLS LINE OVER EASTERN AMS, SLOW-MOVING. - THUNDERY LOW NEAR 31S/37E, SLOWLY MOVING EASTWARD, WITH SQUALL LINE EMERGING AT FIRST OVER WAM. - COLD FRONT OVER SOUTH-WESTERN CRO, RAPIDLY MOVING EASTWARD. - HIGH BUILDING OVER WEST OF ACK AREA, EXTENDING LATER IN A RIDGE OVER CRO. PART 3: FORECAST FOR 24 HOURS FROM 25/04/17 AT 0600UTC TO 25/04/18 AT 0600UTC WAM (30S/40S, 50E/65E) THUNDERY SHOWERS SPREADING OVER SOUTH-WESTERN HALF. WIND: NORTHERN HALF: NORTHERLY 3/4, AT TIMES 5, BUT BACKING SE 6/7 OVER SOUTH-WESTERN AT END. GUSTS WITH SQUALLS. SOUTHERN HALF: VARIABLE 3/3 INCREASING GRADUALLY SOUTH-EASTERLY 6/7 FROM WESTERN. GUSTS WITH SQUALLS. SEA : MODERATE TO ROUGH, BECOMING GRADUALLY FROM SOUTH-WESTERN ROUGH TO VERY ROUGH BY LONG SW SWELL 3 TO 5M. VIS : POOR OR VERY POOR IN PRECIPITATIONS. AMS (30S/40S, 65E/80E) SHOWERS AND THUNDERY SQUALLS OVER EASTERN. WIND: NORTHERLY 3/5 AT TIMES 5, BACKING NW OVER SOUTHERN HALF LATER. SEA : MODERATE TO ROUGH, BECOMING ROUGH TO VERY ROUGH LATER OVER SOUTH- WESTERN BY LONG SW SWELL 3 TO 4M. VIS : POOR OR VERY POOR IN PRECIPITATIONS. CRO (40S/50S, 50E/65E) FRONTAL RAIN AND SHOWERS, THEN SHOWERS BEHIND. WIND: NW 5/6 AHEAD OF THE FRONT, BACKING W 6/7 AT TIMES 8 BEHIND. SETTING-UP SW 5/6 OVER ALL AREA LATER. GUSTS. SEA : VERY ROUGH TO HIGH FROM NORTH TO SOUTH BY LONG SW SWELL 4 TO 6M. VIS : POOR IN PRECIPITATIONS. KER (40S/50S, 65E/80E) FRONTAL RAIN AND SHOWERS. SHOWERS OVER SOUTH-WESTERN BEHIND THE FRONT AT END. WIND: NW 5/6 AT TIMES 7, BUT 3/4 INCREASING 4/5 OVER FAR NORTH-EASTERN. SETTING-UP SW 5/6 LATER OVER SOUTH-WESTERN. GUSTS. SEA : ROUGH TO VERY ROUGH, BUT HIGH OVER FAR SOUTH-WESTERN, BECOMING GRADUALLY VERY ROUGH TO HIGH. LONG SW SWELL 4 TO 6M SPREADING GRADUALLY FROM SOUTH-WESTERN. VIS : POOR IN PRECIPITATIONS.