WASHINGTON (Reuters) - Severe weather including possible tornadoes, damaging winds, rain and hail were expected from Texas to Wisconsin by forecasters on Sunday morning.
The severe weather continues for a second day after a large tornado, part of a volatile storm system caused by a springtime warm weather front, left significant damage in Iowa.
"As some residents of the Plains, Ohio Valley and Southeast found out on Saturday, the atmosphere is ripe for severe weather, including tornadoes," said Accuweather.com senior meteorologist Alex Sosnowski.
"This could prove to be a memorable event for the Heartland," he said.
Sosnowski warned that that the atmospheric conditions will bring risks of loss of life over the next few days as the slow-moving system crawls across the eastern half of the United States until it reaches the Northeast on Monday night.
According to the Weather Channel on Sunday morning, the cities in the peak tornado threat zone were Iowa City, Waterloo, and Dubuque in Iowa; Moline, Illinois; Rochester, Minnesota; and La Crosse and Madison in Wisconsin.
The peak U.S. tornado season lasts from March until early July, the period when warm, humid air often has to thrust upward against cool, dry air.
This weekend's storm is being caused by a front of warm air surging northward across the country's midsection, bringing very warm temperatures with some posting possible record highs.
(Reporting by Wendell Marsh; Editing by Jerry Norton)