Midwest
A new cold front , stretching from Upper Michigan to the South Dakota-Nebraska line Saturday morning , will quickly move southward toward the mid-Mississippi and Ohio Valleys. Thunderstorms will continue to develop in advance of the front. Some could be severe with strong wind gusts and hail from across southern Illinois, southern Indiana and Kentucky. Highs Saturday will range from the upper 50s in northern Michigan to the low 90s in Kansas. On Sunday, the next cold front will already zip from the Dakotas into the Upper Midwest, sparking thunderstorms, some severe, from the eastern Dakotas to northern Michigan. This second front and associated thunderstorms will be southbound early week, extending from the Great Lakes to the central Plains . Behind the front, highs will be much cooler in the 60s and 70s (maybe even a few 50s in the high Plains and along the Canadian border) from the Dakotas and Nebraska to Michigan.
Northeast
The wet weather that has plagued the Northeast for days will finally shift offshore Saturday. The drier weather, though, will be brief for some. Ahead of the next cold front moving into the Northeast Saturday night, showers and a few thunderstorms will develop later in the day from New England to West Virginia . Highs Saturday will range from the 60s along the Canadian border to the 70s in southern New England and some low 80s outside of the mountains in the Mid-Atlantic. The front will zip through on Sunday with minor fanfare: showers in northern New York and northern New England and a few thunderstorms in southern West Virginia and southwest Virginia . Already on Monday, yet another front will approach the upper reaches of the region via Lakes Erie and Ontario , sparking showers and a few thunderstorms from northwest Pennsylvania to Maine. One or two thunderstorms may dot the remainder of western Pennsylvania and West Virginia early week. The rest of the region will start the new workweek dry.
South
The South will be mostly dry over the next 3 days. South Texas and south Florida will be prone to scattered thunderstorms. Also, Sunday, a few thunderstorms will slide southward from the Ohio Valley into the Tennessee Valley and southern Appalachians. Isolated thunderstorms may pop in the southern Appalachians again on Monday. Highs will mainly be in the mid 80s to mid 90s region wide.
West
Through Monday, isolated or widely scattered thunderstorms will pop each afternoon and evening across the West from southern and eastern Oregon , northern California and the Sierra to the high Plains from Montana to New Mexico. Only Washington, Southern California and the Desert Southwest will stay clear of these stray storms. Highs Saturday will be in the 80s to near 90 across the lower elevations of the interior Northwest. Much cooler high pressure will move into Montana and Wyoming by Monday with highs only in the 50s and 60s. The heat in the Desert Southwest, mid 90s to low 100s, is about average for this time of the year.