Thursday 5 November 2009

7 days of NW - le weekend for 7 and 8 November

The forecast is for an extended period of NW - and Rob Kakebeeke may have been right that we should be tending to our equipment this weekend!
Today was the day to be flying, this picture of Table Mountain (whilst i had to source a crimping tool for the transponder antenna - thank you Sarel Oosthuizen - tells the story) What i would not give for a self launcher and an infinite sum of money to fly when the weather is up to it ;-)


The forecast looks like this
Saturday
Katabatic warm front, quasi-stationary, 292km to the NE, vertical motion -30m/hr
the frontal layer is between 5000 and 10000ft
Surface wind - 40Nw, 5000ft 70NW, 10000ft 130NW, 15000ft 150NW, 20000ft 160NW
Wave NIL
Cloud 3 - 5/8 from 20 000ft upwards to 8/8 at 40000ft (where the wind is 210kph NW)
Severe surface turbulence, moderate turbulence 6000 - 10000ft
Shear is 30ms / 4km
Max 22.2C Dewpoint 3.3C Trigger 20.4C
Expect 1.2 ms - 1.8 ms to 62000ft
Boundary layer energy 70 J/kg
Sunday
Katabatic cold front, 266km to the E, moving at 56kph towards the east, vertical motion -1036m/hr
Surface wind - 20NW, 5000ft 40NW, 10000ft NW 60, 15000ft NW 80, 20000ft 110 NW
Wave From 13600ft upwards
Cloud 8/8 from 2000ft - 30000ft (the dry and wet adiabats are closely matched from the surface to 30K)
But it keeps the windshear down to 18ms/4km
Surface turbulence remains severe
No rain on the sounding, but i would expect some
Max 12.6C Dewpoint 9.9C Trigger 13.6
Expect 0.5 ms to 3000 ft
boundary layer energy 2 J/kg

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