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 January 2018 at 08:30 UTC.

For southeast 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 201000 to 211000 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 warnings: =============== 1. Cape west: se to E 35 in the south-east.

Synoptic situation at 06:00z ============================== high 1020 hpa 24s18w high 1028 hpa 45s13e. Low 980 hpa 47s18w low 990 hpa 59s46e.

1. Cold front: 40s22w 45s17w into 47s18w cont. 55s13w 60s09w.

Area forecast: ============== Ascension (06s/15s, 00e/20w) wind : SW to S 10 to 15 in the extreme northeast at first, becoming variable 05 to 10 towards the end of the period otherwise se 10 to 20. Vis : good.

Angola (06s/15s, 00e/west coast) wind : se 10 to 15 in the extreme South-West, otherwise variable 05 to 10. Vis : moderate to poor in showers and fog in the east.

St Helena (15s/30s, 00e/20w) wind : variable 05 to 10 in the south, otherwise se to E 15 to 25. Vis : good.

Trades (15s/30s, 00e/west coast) wind : SW to S 10 to 20 in the extreme east at times, otherwise S to se 15 to 25. Vis : poor in fog patches in the east, otherwise good.

Tristan (30s/40s, 00e/20w) wind : variable 05 to 10 in the northeast but NE to N 15 to 25 southeast, otherwise N to NW 20 to 30. It will become SW to S 15 to 25 in the southwest towards the end of the period. Vis : moderate in showers in the west, otherwise good. Sea state: 3.0m in the southwest, SW to W swell.

Cape west (30s/40s, 00e/20e) wind : se to S 20 to 30 in the east, reaching 35 in the south-east but E to NE 15 to 25 in the west. It will become cyclonic 15 to 25 in the in the northeast from mid-period. Vis : poor in fog patches in the northeast and moderate in showers over the central parts, otherwise good. Sea state: 3.0 to 4.0m in the east, reaching 4.5 to 5.0m in the southeast, SW to se swell.

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