Temperatures will be above average over the Southwest; temperatureswill be below average from the Northeast to the Southeast, then to theSouthern Plains...A front extending across the Florida Peninsula Coast will slowly movesouthward of the Florida by Monday afternoon. Showers with strong tosevere thunderstorms will develop along the boundary. Therefore, the SPChas issued a Marginal Risk (level 1/5) of severe thunderstorms over partsof the Florida Peninsula through Monday morning. The hazards associatedwith these thunderstorms are frequent lightning, severe thunderstorm windgusts, hail, and a minimal threat of tornadoes.On Monday, the front moves south of Florida by afternoon. Showers withstrong to severe thunderstorms will develop over parts of the FloridaPeninsula until the boundary moves offshore. Therefore, the SPC has issueda Marginal Risk (level 1/5) of severe thunderstorms over parts of theFlorida Peninsula through Monday afternoon. The hazards associated withthese thunderstorms are frequent lightning, severe thunderstorm windgusts, hail, and a few tornadoes.Meanwhile, high pressure over the Middle Mississippi Valley/SouthernPlains will gradually shift eastward, reaching off the Southeast Coast byTuesday evening. Clear skies and light wind will help allow temperaturesto be 5 to 15 degrees below average from the Northeast to the Southeastand then to the Southern Plains, which will experience a slight warmingtrend by Tuesday afternoon. In contrast, temperatures will be 5 to 15degrees above average over parts of the Southwest through Tuesday evening.A second front over the Northern Rockies to the Great Basin will also moveeastward to the Great Lakes to the Southern Plains by Tuesday. On Monday,as the boundary moves onto the Plains, a weak plume of moisture flows fromthe Western Gulf of Mexico to the Upper Midwest, aiding in the developmentof rain over parts of the Northern Plains and the Upper Mississippi Valleyovernight Monday into Tuesday. On Tuesday, the rain moves into the GreatLakes. By Tuesday evening, the rain will extend from the Lower Great Lakessouthwestward to the Middle Mississippi Valley. Cold high pressure overHudson Bay will stream cold air over Lake Superior, developing light snowover the southern shore of Lake Superior.