A storm system over the Montana border will move southeast Monday into the central United States, bringing snow to the northern and central Rockies and the northern Plains into Minnesota, forecasters said.
Widespread showers and thunderstorms are also expected to extend from eastern Texas through the Ohio Valley. A slight risk of heavy storms is forecast for part of the Mississippi Valley, Tennessee and Kentucky. Some storms will be capable producing tornadoes and isolated damaging winds.
Dry and warm weather is predicted for much of the Southwest.
Highs for the southern third of the nation will remain in the 70s and 80s while the Northeast, Midwest and parts of the Northwest can expect highs in the 40s and 50s. The coolest region will stretch from the Northern Rockies eastward into northern Minnesota, with highs in the 30s and upper 20s.
Temperatures in the Lower 48 states Sunday ranged from a low of 7 degrees at Stanley, Idaho, to a high of 92 degrees at McAllen, Texas.
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