Great Weather for Spring Break all this week in South Florida.Unsettled weather is expected from the Pacific Northwest and northernCalifornia into the central Rockies with lower-elevation rain and higherelevation snow through mid-week.An increased risk of wildfires will shift southward from the centralPlains today into the southern High Plains for Tuesday and Wednesday.Anomalously warm temperatures to expand eastward from the Upper Midwestinto the Ohio Valley, Mid-Atlantic and Northeast through Wednesday.An upper level disturbance over the western U.S. today will weaken as ittranslates eastward, to be followed by a stronger impulse to reach theWest Coast this evening. A Pacific front will move across the western U.S.through Wednesday, bringing mountain snow and lower elevation rain, alongwith cooler than average temperatures. Snowfall totals of 6-12 inches areexpected into the higher terrain with totals over a foot likely for thehighest elevations across the West into the northern and central Rockies.Rain or a rain/snow mix can be expected for the lower elevations as thestorm system advances south and east.Low relative humidity and gusty winds have prompted Critical Risk fireweather concerns across a good portion of central Plains into the TexasPanhandle and a portion of eastern Wyoming through the rest of Monday. Asurface low will develop across the central High Plains on Tuesday,advancing eastward with time. Dry conditions with gusty winds will shiftfire weather concerns into the southern High Plains for Tuesday andWednesday while precipitation develops northward during the day onWednesday.The departure of a strong surface low near Nova Scotia into the westernAtlantic will allow for a gradual lowering of gusty winds across thenorthern Mid-Atlantic and Northeast through Tuesday. Breezy conditions arelikely to remain for northern New England into Tuesday night, but overallimprovement is expected. High pressure over the southern U.S. will slideeastward over the next couple of days, allowing winds to return from thesouth, bringing warmer temperatures northward. The greatest departuresfrom normal highs will remain over the Upper Midwest and Great Lakesregion on Tuesday which may cause a few record daily maximum temperaturesto be broken, but the magnitude of the anomalous warmth is likely to belower on Tuesday compared to Monday. High temperatures in the 60s to lower70s will expand eastward through Wednesday across the Ohio Valley andportions of the northern Mid-Atlantic into the Northeast, roughly 15 to 25degrees above mid-March averages. With the warmer weather will come thethreat for thunderstorms across portions of the central U.S. Some severethunderstorms will be possible ahead of a dryline from easternOklahoma/Kansas into western Missouri on Tuesday with a broader riskacross some of these same areas on Wednesday.