For the past few days, much of Iowa has been under a convective slight risk by the Storm Prediction Center for Saturday. Prior to this upcoming event, the featured map presents an analysis of the year of last day 2 slight risk over the CONUS. This analysis is done by rasterizing the outlook polygons to a grid. For NW Iowa, it has been ten some years since a slight risk (the present day two disk covers almost all of that area). While this map does not address frequency, the southeastern US is certainly the most common area for such alerts during March. The storm systems that produce severe weather typically track SW to NE over the United States, so the northern and western portions are almost always on the cold side of such systems. The upcoming storm threat on Saturday looks to be mostly from straight line winds, but a tornado threat is present as well.

Voting:
Good = 19
Bad = 1
Abstain = 2