Marine Weather for HS 016

Forecast
weather bulletin for the high seas for Metarea VII. West of 20e. Issued by the South African Weather Service on the 20th of June 2019 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: ======= forecast valid from 202200 to 212200 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. These estimates of winds and waves do not take into account the enhancing effects of the Agulhas Current off the South African East Coast.

Gale force warnings: ==================== 1. Tristan: NE to N 35 in the South-West, becoming W to NW 35 in the west and South-West by the second half of the period. 2. Cape west: W to NW 35 to 40 in the extreme east. 3. Gough forties: NW 35 in the west. 4. Meteor forties: NW 35 in the west and South-West by the second half of the period.

Synoptic situation 12:00z: ========================== high 1026 hpa 35s15w high 1038 hpa 35s55e. Low 990 hpa 46s14e low 1014 hpa 30s15e.

1. Cold front: 32s00e 35s06e 41s10e into 46s14e.

Area forecast ============== Ascension (06s/15s, 00e/20w) wind : E to se 10 to 20. Vis : good.

Angola (06s/15s, 00e/West Coast wind : S to se 10 to 20 but SW 10 to 15 in the extreme east. Vis : good becoming moderate in showers in the extreme east.

St Helena (15s/30s, 00e/20w) wind : E to se 15 to 25, but NE to N 15 to 25 in the South-West. Vis : good. Sea state: 3.0 to 4.5m, SW swell.

Trades (15s/30s, 00e/west coast) wind : cyclonic 05 to 15 in the extreme east, otherwise S to se 10 to 20 but W to SW 15 to 25 in the extreme south. It will become S to se 20 to 25 by the second half of the period. Vis : good but moderate in showers and rain in the places by the first half of the period. Sea state: 3.0 to 4.5m, SW swell.

Tristan (30s/40s, 00e/20w) wind : S to se 15 to 25 in the extreme east at first, otherwise NE to N 20 to 30, reaching 35 in the South-West. It will become W to NW 25 to 35 in the west and South-West by the second half of the period. Vis : good becoming moderate to poor in showers and rain in the west and South-West by the second half of the period. Sea state: 3.0 to 4.0m, reaching 4.5 to 6.0m in the south-east, SW swell.

Cape west (30s/40s, 00e/20e) wind : W to NW 20 to 30 in the east and North-East by the first half of the period, otherwise S to SW 20 to 30, reaching 35 to 40 in the extreme east, while se 10 to 20 in the extreme west by the second half of the period. Vis : good in the west but moderate in showers and rain in the east. Sea state: 3.0 to 5.0m, reaching 5.5 to 7.0m in the east and south-east, W to SW swell.

Gough forties (40s/50s, 00e/20w) wind : W to SW 10 to 20 in the extreme North-East at first, otherwise NW 20 to 30, reaching 35 in the west. Vis : good but moderate to poor in showers and rain from the west spreading eastwards. Sea state: 3.0 to 4.0m reaching 4.5 to 7.0m in the west and South-West, SW swell in the east but NW swell in the west.

Meteor forties (40s/50s, 00e/20e) wind : W to SW 20 to 30, becoming NW 25 to 35 in the west and South-West by the second half of the period. Vis : good becoming moderate to poor in showers and rain from the west by the second half of the period. Sea state: 4.0 to 5.0m reaching 6.0 to 6.5m in the north and east, W to NW swell.

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