Don't You Forget About the TROWAL!!

SPC has issued a high risk area for severe weather this afternoon over the SE US. Yes, most of you are as giddy as a kid on Christmas eve but give winter weather some love.

Look at the mosaic radar image for the Upper Mississippi River Valley, there is nice heavy snow band east of Sioux Falls, SD. This is associated with the trowal (trough of warm air aloft) feature. This is a classic case!

~ Doc Ng



Day 1 Convective Outlook valid for 1630Z on 01 March 2007 (courtesy of SPC)



NWS Radar Mosaic of the Upper Midwest Region from 1548 - 1658 UTC on 01 March 2007(courtesy of NWS)