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Across the Corn Belt, a low-pressure system is crossing the upper Great Lakes region, where showers linger. Showers and thunderstorms extend southward into the middle Mississippi Valley along a trailing cold front.

In advance of the front, favorably warm weather across the eastern Corn Belt is promoting the development of late-planted corn and soybeans.

On the Plains, dry weather has returned across Montana and the Dakotas, following repeated rounds of heavy rain during the early- to midweek period that slowed or halted small grain harvesting. Meanwhile, showers and thunderstorms across the southern Plains are providing limited relief from a fast-developing drought.

In the South, cooler air is overspreading the southern Mid-Atlantic region, accompanied by some rain and drizzle. However, hot weather across the remainder of the region continues to promote crop maturation and fieldwork, including corn and rice harvesting. A potential tropical cyclone over the Bahamas is contributing to a showery pattern that extends across Florida’s peninsula.

In the West, mostly dry weather accompanies a general warming trend, favoring most fieldwork operations. Any shower activity is limited to the southernmost Rockies and the Pacific Northwest.

A tropical disturbance over the Bahamas is expected to further develop and could soon become Tropical Storm Humberto. Tropical showers will continue to overspread the southern Atlantic region, where 5-day rainfall totals could reach 2 to 4 inches or more.

Meanwhile, rain over the Great Lakes region will subside later Friday. Farther west, a showery weather pattern will affect the Pacific Northwest, resulting in 5-day rainfall totals of 1 to 2 inches or more.

Most of the remainder of the country, stretching from southern California to the northern and central Plains and from the mid-South into the Ohio Valley, will receive little or no rain. Elsewhere, late-season warmth will affect much of the country, but cool conditions will develop or expand across the Northeast and the Far West.

Looking ahead, the 6- to 10-day outlook calls for the likelihood of above-normal temperatures nearly nationwide, with cooler-than-normal conditions limited to the Great Basin and Intermountain West. Meanwhile, near- or above-normal rainfall across most of the country will contrast with drier-than-normal weather from the lower Great Lakes region into northern New England.

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Greg Soulje, a professional meteorologist since 1985, offers national agricultural weather forecasts via "This Week in Agribusiness."