A deep 500 mb trough coves the western half of the US this morning - see top image - and is bringing unseasonally cool temps to much of the country. Here at the house the morning low on this last day of April was 38F. Precipitation with this feature is mostly out in the Plains and eastward. Today's outlook from the SPC (bottom image) indicates a forecast of a slight risk of severe thunderstorms over almost all of the Mississippi Valley.
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