Pattern unsettled, temps vary across the Heartland
A slow-moving storm system currently centered near the southern end of Lake Michigan will drift eastward, reaching southern New England by late Friday.
Cool, rainy, breezy weather will accompany the storm, with additional rainfall of 1 to 4 inches expected in many areas east of the Mississippi River. Late Wednesday into Thursday, heavy rain could cause flash flooding and river rises in the middle Atlantic States.
Along the storm’s trailing cold front, severe thunderstorms will remain a threat across the South into Thursday. In contrast, little or no rain will fall during the next 5 days from California to the southern High Plains.
Early-season heat will accompany the dry weather, with late-week temperatures expected to top 100° across parts of the southern Plains. Farther north, periodic showers will occur from the Pacific Northwest to the northern and central Plains, although Friday’s high temperatures could soar to 90° or higher as far north as Nebraska.
Looking ahead, the 6- to 10-day outlook calls for below-normal temperatures in most areas east of the Rockies, while warmer-than-normal weather will prevail in the Pacific Coast States, Great Basin, Desert Southwest, Rio Grande Valley, and lower Southeast.
Meanwhile, near- or below-normal precipitation across much of the western and central U.S. should contrast with wetter-than-normal conditions on the northern High Plains and from the Mississippi Delta to the Atlantic Seaboard.