A cold front was expected to move eastward through northern New England and stall from the Northeast southwestward through the Ohio and mid-Mississippi Valley.
Moderate to heavy rain was expected from the mid-Mississippi Valley into the Ohio Valley. Strong to severe storms were possible from the central Plains across the Midwest and Ohio Valley.
In the West, a Pacific system was expected to spread light to moderate rain from the Pacific Northwest and far northern California across the northern Intermountain West.
Farther south, the Desert Southwest and much of the interior of California was likely to see dry and hot weather as high pressure lingers. The hottest region was expected to stretch from the California deserts eastward into the extreme southern Texas, where temperatures were likely to soar into the triple digits.
With the warm moist air across the southern Plains, afternoon showers and thunderstorms were possible. Elsewhere, a weak area of low pressure was expected to remain near the Florida Peninsula, triggering scattered showers and thunderstorms.
Temperatures in the Lower 48 states on Monday ranged from a low of 28 degrees at Dayton, Ore., to a high of 111 degrees at Wink, Texas.
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