After the huge snow storm in the East, attention for the next strong storm event will shift to the Southwest. This morning's (Sunday 20 Dec 09) NAM 500 mb forecast valid on Wednesday morning indicates very strong PVA across southern Arizona. Thicknesses (1000 - 500 mb) around Tucson are very near 534 dm, indicating quite low snow levels with this storm. All the models are very consistent and indicate that this strong S/W will swing rapidly into the Central Plains, producing a Christmas Eve blizzard. Thus, a very interesting event is unfolding for Southwest and Central Plains as Christmas approaches.
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