Post Frontal Sounding
by Meteorologist Joe Haynes
POSTED: 8:54 pm CDT September 3, 2010Tonight's weather balloon data taken by the Shreveport National Weather Service and plotted skew-t/log-p style by www.rap.ucar.edu shows a post frontal atmosphere. At launch time, the cold front was from Alexandria to near Lufkin.
Behind the boundary, much drier and cooler air is filtering into the ArkLaTex for a nice Fall-Like weather change. In Shreveport, the sounding shape illustrates the post frontal environment with mid level subsidence. This comes from the back side of the upper level trough moving through. Here, drying and warming is dominating the graph from about 500 mb or 18,000 FT and up. The drying shows up with the dew point and temperature lines far apart.
Closer to the ground, a stratus cloud deck is hanging out at about 6,500 FT and up to 8,000 FT. The clouds are flat just showing some post frontal lift. NW winds throughout the atmosphere and the subsidence mixing toward the ground will take care of that moisture later tonight.
CAPE is zero, so no rain is expected. The forecast calls for cooler and drier conditions through Sunday.
Enjoy the long weekend!
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