Powerful thunderstorms will cut a swath across the nation's heartland into Wednesday night, threatening to bring flooding downpours, hail and damaging winds.
The storms will continue to erupt along and ahead of a cold front slicing into summerlike heat and humidity in place over the Midwest.
Some of the storms will impact the waterlogged Northland of Minnesota, still reeling from extensive flooding since Tuesday.
The overall area in the threat zone extends from the Upper Peninsula of Michigan south and west through Wisconsin, southeastern Minnesota, Iowa, southeastern Nebraska, northwestern Missouri and Kansas from into Wednesday night.
This encompasses vast areas of countryside and population centers, including Marquette, Mich.; Green Bay and Madison, Wis.; Cedar Rapids and Des Moines, Iowa; the Quad Cities of Iowa and Illinois; Lincoln and Omaha, Neb.; Kansas City, Mo.; as well as Topeka and Wichita, Kan.
As is typical with strong cold fronts cutting into warm air masses, many of the storms that develop could turn severe and generate hail large enough to cause damage.
Strong wind gusts in excess of 40 to 50 mph will also be a frequent occurrence in the storms.
The atmosphere will also continue to be loaded with plenty of water, meaning thunderstorms will be able to ring out plenty of moisture in the form of torrential downpours.
Heavy rain will quickly overwhelm storm drains in low-lying areas, creating a hazard, not only for drivers but pedestrians as well. Never, ever drive through areas where water is covering or flowing across the roadway.
A slow-moving storm resulted in a week of below-normal temperatures that will likely continue into the week.
Heavy rain returning to the northern Plains will generate a renewed flood threat for the Red River.
See how far away severe thunderstorms are as we monitor the severe weather with these radar images.
Mount Saint Helens has erupted several times since the destructive 1980 eruption, and likely will again in the future.
Seven homes have been red tagged, meaning do not occupy, and six others are under a voluntary evacuation order.
Though recovery continues from Superstorm Sandy, residents and homeowners on the Atlantic coast should prepare for another active season in 2013.
Sibi, in the northwest, had a high of 115 with a dewpoint of 90. The RealFeel was 150 degrees.
New England (1780)
The Dark Day: a famous weather event in New England. The sky appeared almost nighttime at noon and chickens went to roost. The phenomenon cleared up late in the afternoon and was later learned to have been caused by massive forest fires in the West.
Buffalo, NY (1986)
3.41 inches of rain -- a 24-hour record for May.