Stable Wednesday Night Sounding
by Meteorologist Joe Haynes
POSTED: 9:00 pm CDT September 1, 2010Tonight's sounding from the Shreveport National Weather Service and www.rap.ucar.edu illustrates stability at near maximum heating with zero CAPE or storm energy. The shape of the plotted data has a fairly warm and dry air column helping to keep CAPE low.
The only moisture of consequence is the formation of scattered and flat cumulus clouds when parcels were heated or possibly lifted by outflow boundaries dry adiabatically to saturation at the LCL (lifting condensation level) or the CCL (convective condensation level) near balloon launch time. With the lack of CAPE, the parcels didn't grow vertically along the moist adiabat. Thus, early this evening, the rain chance was near zero.
Tonight, with cooling, the inversion layer will help cap the sounding. The weather disturbance to our northwest with it's mid level cooling or destabilizing effects plus vertical lift will still have a tough time producing rain in Shreveport. Best chance is along I-30 for the rest of the evening and again tomorrow with some heating.
Have a nice night.
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