Major spring storm to bring numerous weather threats from theSouthern-Central Plains, northeast into the Mid Mississippi , Ohio Valley,Great Lakes, Mid-Atlantic and NortheasTSevere weather likely late Monday afternoon/Monday night from theSouthern to Central Plains into the Mid Mississippi Valley...into the OhioValley, Tennessee Valley and Southeast on TuesdayHeavy Rains and Flash Flooding possible from the Mid MississippiValley, into the Ohio Valley and Central AppalachiansHeavy Snows to develop Tuesday and continue through Wednesday acrossmuch of Wisconsin, the U.P. of Michigan the northern portions of the L.P.of MichiganMuch above average temperatures to continue across the South Tuesday,cooling significantly on WednesdayElevated to Critical Fire Weather Threat for West and Southwest TexasA highly impactful, major Spring storm will produce numerous hazards overthe next few days as it strengthens over the Southern Plains Monday nightand pushes northeastward Tuesday across the Mid Mississippi Valley, OhioValley and into the Lower Lakes, becoming nearly stationary over the LowerLakes on Wednesday.  Severe weather likely to develop across portions ofthe Southern to Central Plains late Monday afternoon/evening and spreadnortheastward quickly across the Lower Missouri Valley, Mid MississippiValley Monday night into early Tuesday. This severe weather threat willthen spread into portions of the Ohio Valley, Tennessee Valley andSoutheast on Tuesday.  Large hail, high winds and tornadoes are allpossible with this severe weather over the next two days. In addition to the severe weather threat, heavy rains and flash floodingwill also be possible late Monday into Tuesday from the Lower MissouriValley, across the Mid Mississippi Valley, Ohio Valley and into theCentral Appalachians.   Flood watches currently stretch from centralIllinois, across large portions of Indiana, Ohio, northeast Kentucky, muchof West Virginia, far southwest Pennsylvania and far western Maryland. As this storm deepens on Tuesday across the Mid Mississippi Valley/LowerLakes region, precipitation will change to snow on the northwest side ofthe system from northern Illinois, across much of Wisconsin, the U.P. ofMichigan and the northern L.P. of Michigan.  Early Spring heavy snowfalltotals of 4-8"+ possible across these areas, with regions from eastern Wisconsin into the Upper Peninsula of Michigan having the greatest chancesof heavy snowfall.  By late Wednesday afternoon another area of lowpressure is forecast to begin to deepen along the Mid-Atlantic coast. Heavy snows are forecast to begin to develop late late Wednesday afternoonand continue into Thursday to the north of this low across portions ofUpstate and Northern New York into much of central to northern NewEngland.