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Summer's last weekend before Monday’s autumnal equinox will be filled with a bunch of summer-like weather. This will include a bit of rain, thunderstorms and unseasonably hot temperatures.
Saturday
Saturday’s most unsettling weather will extend across the central U.S. from western Texas and the southern Plains into the Midwest. Showers and thunderstorms will develop Saturday afternoon throughout this entire corridor, with a deluge developing after dark across the Missouri and central Mississippi Valley and the north-central Plains. Heavy rain will roll out of the Rockies into the Dakotas, with a few early-morning snowflakes in the northern Rockies. A few showers will be possible in the Ohio Valley and central Appalachians too. Temperatures will be in the 70s, with the southern Plains seeing highs in the 80s.
East of these widespread storms, a large high-pressure area off the Atlantic Seaboard will produce a quiet Saturday throughout the Southeast, Ohio and Tennessee Valley and the Northeast. Unseasonably hot 90s will be found in the South and along the Gulf Coast with 80s found as far north as Mid-Atlantic. New England will be in the 70s.
The West Coast will also be warm and sunny with highs jumping into the 70s and 80s, with 90s in the Southwest and interior southern California, will make it a great day to head outside. Conversely, the Rockies and Mountain West will be colder and afternoon highs in the 50s will bring out the jackets.
Sunday
The central Plains, Middle Mississippi Valley, Midwest and western Great Lakes will wake up to a soggy and stormy Sunday morning as the line of storms that develop Saturday afternoon over the Plains slowly moves eastward. The heavy rain will stretch from the southern Plains into the Great Lakes. It will linger over parts of the central Mississippi Valley and the Midwest for much of the day. This could trigger new rounds of flash flooding. Highs will be in the 70s and 80s.
The Northwest will also have a soggy end to the weekend. A new Pacific storm system will roll ashore, bringing rain to the coastal Northwest early Sunday. The rain will jump over the Cascades and make it into the Intermountain region later Sunday. The rain will keep it mild and highs will be in the 60s and low 70s.
The rest of the West Coast, Great Basin, Rockies and the western and northern Plains will have a sunny Sunday. Highs will be in the 80s and low 90s across California with triple digit highs in the Desert Southwest. The Rockies, Great Basin and western high Plains will be in the 60s and 70s. The northern Plains will have 50s, so a jacket for outdoor activities are needed.
The streak of nice weather continues across the East. A mostly sunny day will be found from the eastern Gulf Coast and the South northward into New England. Highs will be in the 80s throughout the South, Southeast, Ohio Valley, Appalachians and Mid-Atlantic. The Northeast will be in the 70s.