Weather.com - 4/09/13, Jon Erdman and Nick Wiltgen
Recent spring warmth has come to a crashing halt for parts of the Rockies and Plains as Winter Storm Walda brings heavy snow, very high winds, and a drastic drop in temperatures that has even led to freakish sub-freezing severe thunderstorms.
We have a classic spring storm pivoting out of the West into the Plains. This bullish dip in the jet stream is bringing not only a winter storm, but an outbreak of severe thunderstorms this week in the warmer air to its east - and in some cases, even over the colder air behind its cold front.
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