Alberta Clipper Moving In………But All Virga So FarMarch 14th, 2013 at 1:23 pm by Chad Evans under Chad's WLFI Weather Blog
So far, any precipitation has evaporated (virga) for it has gotten to the ground in our western half. However, snow is reaching the ground in eastern Illinois.
Expect this wave of snow showers to pass this afternoon & some areas to see their grass whitened briefly by 0.5″ or less of accumulation. Pavement will likely just stay wet.
Originally, thought this might be a bit of rain/sleet/snow showers mixed at first, but sounding shows alot of very dry air at mid & low levels that would first caused any raindrop to freeze with wet-bulbing, causing some sleet. This would be very short-lived, as rapid cooling would support all snow shortly thereafter with the entire column cooling & saturating.
As of 1:30 p.m., temperature is 37.0 at WLFI with a dew point of 15 degrees. As the snow falls, we will likely see our temperature wet-bulb or evaporatively cool from around 39 to around 30 rapidly.