Thursday, 12 November 2009

Le weekend - 14 November

The NWester is still blowing (unabated now for 7 days - not often that we see that in November, but when it does happen Bitterwasser and Pokweni suffers, and OLC reveals that) but the sun is peeking out behind Lionshead, and by noon tomorrow the rain should disperse and by Sunday the Cape Doctor will be howling.
The weekend looks like this
Saturday
Surface wind - WSW 20, 5000ft WSW 20, 10000ft W 50, 15000ft W 110, 20000ft WSW 150!!!Strong surface turbulance
Shear is moderate at 18ms/4km
Wave from 10000ft, 12000ft,16000ft at 3m/s (as always expect it much lower in the valley and with the Westerly it should be contactable (and i really want to test my Trig21 mode S transponder ;-)
Cloud 3/8 at 5000ft
Max 17.9C Dewpoint 6.4C Trigger 15.5C
T-2 to 5000ft (we haven't seen that for quite a while)
Expect 1.3 ms - 1.8 ms to 6 800 ft
108 Joule/kg
Sunday
The SE sets in, with a strong inversion at 7500ft and westerlies above that. Sounding shows a katabatic cold front 80km to the NE, Vertical motion -1325m/hr
Surface wind - SE20, 5000ft SE 20, 10000ft W 30, 15000ft WSW 80, 20000ft WSW 110
VERY Strong surface turbulence - WATCH the ridges, also the strong shear conditions at 6800 - 8000ft
Shear is 20ms/4km
Wave - from 10200ft upwards to 27000ft at 2 - 3m/s (but probably out of reach of all but a DG808)
Cloud Bleu
Max 17.7 Dewpoint 6.1 Trigger 16.1 Expect 1.0 ms - 1.4 ms to 5500ft
63 J/kg
EY

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