Major early Spring storm to bring numerous weather hazards from theGreat Lakes, across the Ohio and Tennessee Valleys, the South, Southeastand the Northeast......Heavy snows likely across much of Wisconsin, the U.P. of Michigan,Northern New York State into central to northern New England......Strong cold front to bring much cooler weather Wednesday from the OhioValley into the Lower Mississippi Valley and South......A strong front to move off the Pacific, bringing much cooler temps tothe Pacific Northwest Wednesday, southward into all of California byThursday...An active early Spring weather pattern on both coasts over the next fewdays resulting in numerous weather hazards and dropping temperatures.  Anarea of low pressure across the Mid-West Tuesday afternoon is expected tostrengthen rapidly today into Tuesday evening as it pushes north into theGreat Lakes.  This will be followed by another area of low pressuredeveloping across the Mid-Atlantic Wednesday and pushing northeast intoeastern New England on Thursday.  The combination of these two areas oflow pressure will produce numerous weather hazards over the next 2 days. Heavy snows are forecast to develop to the north of the Mid-West low thisafternoon and continue into Tuesday night and Wednesday across portions ofthe Upper Mississippi Valley and Upper Great Lakes.  Snowfall accumulationof 6-12"+ expected across central to eastern Wisconsin into the central toeastern portions of the U.P. of Michigan.  Winter Storm warnings are ineffect across these areas, along with Blizzard warnings across the centralU.P. of Michigan. Heavy Spring snows also likely to develop Wednesday afternoon acrossnorthern New York State and spread into central to northern New England asthe second area of low pressure deepens along the Mid-Atlantic and NewEngland coasts.  Snowfall totals of 6-18" expected across northern NewYork state, much of Vermont, New Hampshire, much of Maine and portions ofnorthern Massachusetts. To the south of the areas of heavy snows, heavy rains are expected alongand ahead of the strong cold front forecast to sweep eastward tonightthrough the Ohio and Tennessee Valleys and across much of the EasternSeaboard from the Mid-Atlantic to Florida during Wednesday.  The heaviestrain totals are expected from the Upper Ohio Valley into the CentralAppalachians and into the Mid-Atlantic.  Widespread Flood watches arecurrently in effect across these areas.  In addition to the heavy rain andflooding threat, severe weather is also possible across portions of theOhio and Tennessee Valleys and much of the South Tuesday afternoon andTuesday night, and into the Southeastern U.S. on Wednesday. Much cooler temperatures are expected in the wake of this strong front asit pushes eastward.  Much above average temperatures are expected tostretch from the Lower Mississippi Valley, eastward into theOhio/Tennessee Valleys, South and Southeast on Tuesday, being replaced bybelow average temperatures Wednesday and Thursday behind the strong coldfront.