A band of showers and thunderstorms, some severe, will likely develop along a front from eastern Wyoming, South Dakota and Nebraska eastward through the Mississippi and Ohio Valleys.
A low pressure system is expected to push through central Canada, carrying a cold front through northern Plains. As this occurs, widely scattered showers and thunderstorms will likely develop from the Dakotas to the upper Mississippi Valley and Great Lakes regions.
Meanwhile, the fifth depression of the Atlantic hurricane season was expected to become a tropical storm before making landfall in southern Texas on Thursday morning. National Weather Service forecaster Tim Speece said the system could bring heavy rains as far north as Victoria and as far inland as the Hill Country.
Scattered showers and thunderstorms are also likely over the Florida Peninsula, parts of the Southwest and Southern California.
A heat wave that has persisted over the southern half of the country the past few days is not expected to let up anytime soon. Triple-digit heat indexes are likely across the central and southern Plains, as well as the mid- and lower Mississippi Valley regions.
Temperatures in the lower 48 states Tuesday ranged from a low of 27 degrees at Swan Lake, Mont., to a high of 119 degrees at Death Valley, Calif.
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