In the West, warm weather is returning to California, but chilly conditions linger across the Rockies and the Northwest. Scattered rain and snow showers accompany the Northwestern chill.

On the Plains
, frost advisories are in effect this morning from Nebraska to central Texas. Freeze warnings have been issued for southeastern Colorado, eastern New Mexico, the Oklahoma panhandle, and parts of West Texas. Producers are monitoring the effect of the cold weather on winter wheat, which has begun to head as far north as Kansas.

In the Corn Belt, locally heavy showers are occurring from the Ohio Valley into the lower Great Lakes region, where fieldwork remains at a standstill. Cool, dry air is spreading across the western Corn Belt. Frost advisories are in effect this morning across parts of Illinois, Iowa, Nebraska, and Missouri.

In the South, showers and thunderstorms stretch from Kentucky to the central Gulf Coast. Rain in the Mid-South is aggravating an already serious and record-setting flood situation. Cooler air is overspreading the western Gulf Coast region, while warm, dry weather prevails in the southern Atlantic States.

Outlook: Rain will end later today across flooded portions of the Mid-South and the Ohio Valley. Meanwhile, showers and thunderstorms associated with a cold front will spread into the East, reaching the Atlantic Seaboard on Wednesday. Cool weather will prevail in the front’s wake, although a late-week warming trend will take place across the western and central U.S. During the mid- to late-week period, scattered showers will return to the northern Plains and the Midwest. Unsettled, showery weather will also prevail in the Northwest. The NWS 6- to 10-day outlook for May 8-12 calls for below-normal temperatures in the Pacific Coast States and across the nation’s northern tier, while warmer-than-normal weather will prevail from the Four Corners region into the lower Southeast. Meanwhile, near- to above-normal precipitation across the majority of the U.S. will contrast with drier-than-normal conditions from the Four Corners States to the Gulf Coast region.