ecco il 3d di riferimento x le previsioni di questo evento su stormtrack:

http://www.stormtrack.org/forum/showthread.php?t=11081


eccone un passaggio:

this is one to watch. Can't ask for a lot more in February. ECMWF this morning(last night's 0z run) showing a sub-980 low in IA following a couple days of return flow off the gulf. Coupled upper jet structure over the southern states.

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Mike Hollingshead