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Freezing rain sounding

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0Z Sounding from Shreveport...courtesy of Rap Ucar and the Shreveport NWS 0Z Sounding from Shreveport...courtesy of Rap Ucar and the Shreveport NWS

Tonight's Shreveport sounding from the Shreveport National Weather Service and Rap Ucar indicates a freezing rain set up.  The pattern shows a good bit of the saturated cloud layer (red and green lines or temperature and dew point lines touching or showing 100% relative humidity) above the freezing mark.  In fact, midway in the saturation layer, it's 13 degrees above freezing or 45 F.

So, the cloud layer would be prone to dropping rain onto a surface that is near freezing.  Thus, with a little evaporative cooling just above the ground (where the temperature and dew point lines separate and the air dries), the surface could easily drop below 32 F and make the rain freeze on contact or produce freezing rain.

It's in the forecast tonight through Tuesday night.  Tonight, with the west winds piping in warm, humid air over the 3,000 FT tall arctic air mass, it will turn out to be a over running situation with freezing rain and drizzle.  Tomorrow night, a weather disturbance will provide much more lift to produce a heavier wintry mix.  Thus, the saturated, warm layer may become cool enough from the lift to mix with sleet and snow.

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