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weather bulletin for the high seas for Metarea VII. West of 20e
issued by the South African Weather Service on the
21st of November 2009 at 08:30 UTC
For southeast 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 211000 to 221000 UTC.
Wind in knots, wave heights in metres. 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 warning(s):
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1. Tristan: NW 35 to 40 in the west.
Synoptic situation at 06:00 UTC
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high 1026 hpa 30s02w high 1034 hpa 37s45e
low 974 hpa 43s20w low 1006 hpa 44s22e low 1010 36s24e
1. Cold front: 30s31w 35s20w 40s15w 45s15w 43s20e
Area forecast:
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Ascension (06s/15s, 00e/20w)
wind : se to E 10 to 15 reaching 20 at times.
Vis : good.
Angola (06s/15s, 00e/west coast)
wind : S to SW 05 to 10 in the east, otherwise se 10 to 15.
Vis : good.
St Helena (15s/30s, 00e/20w)
wind : se to E 15 to 25 but NE to NW 10 to 20 in the South-West.
Vis : moderate in light showers in the South-West.
Trades (15s/30s, 00e/west coast)
wind : SW 10 to 20 in the extreme east, otherwise S to se 10 to
20.
Vis : good.
Tristan (30s/40s, 00e/20w)
wind : variable 05 to 10 in the extreme North-East at first,
otherwise NW 20 to 30 reaching 35 to 40.
Vis : poor in rain and showers in the west, spreading eastwards.
Sea state: 2.5 to 3.5m in the south reaching 4.0 to 6.0m in the west
South-West spreading eastwards, SW swells.
Cape west (30s/40s, 00e/20e)
wind : se 10 to 20 in the extreme North-East, otherwise
counter-clockwise (anti-cyclonic) 05 to 15 but NW 20 to
25 in the west reaching 30 by end of the period.
Vis : good.
Sea state: 2.5 to 3.0m in the south, with mainly SW swells.
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