In the West, temperatures are making the transition to below-normal levels in the northern Rockies, northern Great Basin, and Pacific Coast States, but warmth continues farther east. Dry weather continues to promote fieldwork in most areas, although showers are becoming more numerous in the Northwest.

On the Plains, parts of northeastern Texas are in recovery mode, following yesterday’s tornado outbreak—the nation’s deadliest in more than a year. Currently, scattered showers and thunderstorms continue across eastern Texas and central and eastern Oklahoma. Above-normal temperatures cover the remainder of the region, although increasingly showery weather is starting to slow fieldwork across the northern Plains.

In the Corn Belt, warm weather continues to promote an acceleration of fieldwork, including corn planting, except in areas where showers and thunderstorms have begun to develop. Currently, shower activity is mostly concentrated across the Ohio and middle Mississippi Valleys.

In the South, widely scattered showers are causing only minor fieldwork delays. The heaviest showers, in conjunction with a storm system over the southeastern Plains, are falling west of the Mississippi Delta.

Outlook: The storm system responsible for the recent severe weather outbreak will drift eastward during the next 3 days, generating as much as 1 to 3 inches of rain from the southeastern Plains to the southern Mid-Atlantic States. Meanwhile, a low-pressure system will develop across the nation’s mid-section by week’s end. As a result, 5-day rainfall totals could reach 2 to 4 inches across the northern Plains and upper Midwest. In contrast, little or no rain will fall from central and southern California to the southern High Plains. By week’s end, below-normal temperatures will cover the West, but several days of hot weather will affect the Plains and Midwest. Late-week readings above 100°F can be expected across parts of the southern High Plains. The NWS 6- to 10-day outlook for May 21-25 calls for below-normal temperatures in the upper Midwest, Pacific Northwest, and Gulf Coast region, while warmer-than-normal weather will prevail in the Northeast and Southwest. Meanwhile, below-normal precipitation across the south-central U.S. and central portions of the Rockies and High Plains will contrast with wetter-than-normal conditions along and northeast of a line from North Dakota to Georgia.