In the West, a freeze warning is in effect this morning in parts of southern Washington, including the Yakima Valley. Elsewhere, unusually cool weather in the Northwest contrasts with warm, dry conditions from California to the southern Rockies.

On the Plains, the latest in a series of storms is producing widespread snow across the northern half of the region. Currently, some of the heaviest snow is falling in South Dakota. In contrast, warmth has returned to the southern High Plains, where producers continue to monitor the effects of recent freezes on winter wheat.

In the Corn Belt, cool, mostly dry weather prevails in advance of a developing storm. Some precipitation (rain and snow) is beginning to overspread the western Corn Belt. Significant lowland flooding continues in many river basins from the middle Mississippi Valley northeastward into Michigan, and most Midwestern fieldwork remains on hold.

In the South, cool conditions linger, especially along the southern Atlantic Coast. Dry weather favors a return to fieldwork in most areas, but rain showers are affecting some coastal locations from the Carolinas to Florida.

Outlook: A developing storm currently centered over the central and southern High Plains will lift northeastward into eastern Canada by mid-week. Widespread showers and thunderstorms will occur along the storm’s trailing cold front, with 1 to 2 inches of rain possible in already flooded areas of the Midwest. Significant rain (1 to 2 inches or more) will also occur across the southeastern Plains and the Mid-South. Farther north, early-week snow will spread from the nation’s mid-section into the upper Great Lakes region. During the mid- to late-week period, much of the nation will experience a warming trend. The NWS 6- to 10-day outlook for April 27 – May 1 calls for near- to above-normal temperatures nationwide, except for cooler-than-normal conditions in the western Gulf Coast region and the north-central U.S. Meanwhile, below-normal precipitation from the Pacific Coast to the northern and central Plains will contrast with wetter-than-normal weather in parts of Texas and most areas from the Mississippi River to the East Coast.