Le weekend 12 September

After last weekend there is some of the same ...

the SAWB predictions seem to show a quickly moving front going through with the winds NE Saturday morning swing quickly through to SW by Sunday afternoon, but NOAA is slightly different

So keep a heads up as the weekend approaches

Saturday
Surface wind - WNW 20, 5000ft NW 40, 10000ft NW 70, 15000ft WNW 80,20000ft W 110
Mild turbulence at all levels, wind shear is moderate at 18ms/4km
No frontal indication in the sounding
Wave at 14000 and 31000ft
Cloud Highlevel 5/8
Max 23.1 (well below the SAWB prediction of 28) Dewpoint 4.6 Trigger 23.1 (YES)Expect 0.6 ms - 0.9 ms to 3 500ft
Cloud BLUE
Boundary layer energy 13J/kg
SundayDifferent to the SAWB strong NW!!!
Surface wind - 30NW, 5000ft NW 50, 10000ft WNW 60, 15000ft WNW 90,20000ft WNW 150 (200 at 27K)
Strong surface turbulence in a thick layer (to 2000ft)
Windshear still only 18ms/4km
Wave 9900ft at 2.6ms, 18000ft at 5ms, 21000ft at 1.7ms
Cloud 3 - 5/8 from 2000ft to 9000ft
Katabatic warm front, quasi stationary, 614km to the North, vertical motion -232m/hr
The frontal layer is at 15 - 19000ft on the sounding
Max 13C, Dewpoint 9.6 Trigger 14.6 (!!!!!)
Expect very little to 3000ft
Boundary layer energy 3J/kg

EY