"Joe Hunt" wrote in message
...
Hi all,
Two very interesting ascents from 11Z today are shown below with a few
noteworthy features.

The Herstmonceux ascent shows the surface inversion starting at 975hPa
(MS0.1degC) and ending at 955hPa (8.6degC). The Watnall ascent shows the
boundary layer to be deeper with the inversion starting at 933hPa
(MS3.3degC) and ending at 889hPa (7.0degC).


http://weather.uwyo.edu/cgi-bin/soun...312&STNM=03354
(11Z Watnall)

http://weather.uwyo.edu/cgi-bin/soun...312&STNM=03882
(11Z Herstmonceux)

In addition, the surface wind at Herst. is de-coupled with the flow above
the inversion, a veer of approximately 90deg. This is not so at Watnall.

With the Watnall ascent you would expect more convective
overturning/turbulence to take place and hence more breaks in the StSc
sheet, but observations from the area show nothing different from those to
the SE. I'm lost, please help !

Thanks, Joe

I don;t think there is enough mixing to create the desired effect. It needs
something like the Welsh mountains to break the sheet up. High Res Vis
Afternoon pictures indicated a slightly different texture the to SCu sheet
the further north you went, but it would go largely un noticed below i
suspect.
The Inversion is almost low enough in the SE for the tops of the Downs to
stick through, however as you say further NE the moist boundary layer is
deeper still, and with the lakc of wind, this will make breaking the sheet
over Eastern England virtually impossible until gradient picks up.

ATB
Paul