In the West, warmth is expanding across the Pacific Coast region and the Desert Southwest, promoting fieldwork. Chilly conditions linger, however, across the Rockies and northern Intermountain West.

On the Plains, rain showers are overspreading the Dakotas, where spring fieldwork has been limited by persistently cool weather, wet soils, and lowland flooding. Meanwhile, breezy weather is returning to the drought-stricken southern Plains, where wildfires remain a threat.

In the Corn Belt, a few rain showers linger across eastern areas. Elsewhere, cool, dry weather prevails. Frost advisories are in effect this morning for the middle Mississippi Valley, including parts of Iowa and Missouri. In most areas, soils remain too cool—and in many cases, too wet—to support corn planting.

In the South, scattered showers associated with a strong cold front are sweeping across the southern Atlantic States. Cool, dry weather prevails in the front’s wake. Clean-up and recovery efforts continue in areas devastated by the severe weather outbreaks of April 14-16 and 25-28.

Outlook: Rain will end later today along the East Coast, but a series a disturbances will maintain cool, damp conditions through week’s end across the northern half of the U.S. During the next 5 days, precipitation totals could exceed an inch from the Pacific Northwest to the Midwest. In contrast, mostly dry weather will prevail across the southern one-third of the U.S. Meanwhile, warmth will build eastward, reaching the central and southern Plains by week’s end. The NWS 6- to 10-day outlook for May 9-13 calls for below-normal temperatures across the northern half of the U.S., while warmer-than-normal will prevail from the southern Plains to the southern Atlantic States. Meanwhile, near- to above-normal precipitation across the majority of the U.S. will contrast with drier-than-normal conditions across the Deep South from southern California to Florida.