70 million Americans under severe weather threat from Northeast to Midwest

Severe weather is projected to impact 70 million Americans from the Northeast Sunday through to Tuesday in the Midwest.

NOAA's Storm Prediction Center has issued an enhanced risk outlook for the multi-region storm system, designating it a level 3 out of 5 risk for severe weather.

In the Northeast, intense thunderstorms are likely to develop late Sunday afternoon in a corridor across the upper Ohio Valley into the Pocono Mountains in Pennsylvania and the Catskill region in Upstate New York.

Damaging wind, some hail and tornadoes are possible as the storm spreads slowly southward into Sunday evening.

A line of these strong to potentially severe storms is projected to impact cities from Pittsburgh to New York Sunday night from 10:00 p.m. ET to 11:00 p.m. ET.

In the Midwest, a dynamic weather system across the Rockies and into the Great Plains from the Dakotas to Texas has the potential to form storms capable of becoming supercells and produce very large hail, damaging winds, and tornadoes on Monday.

Scattered severe thunderstorms are likely across the southern to central Great Plains, mainly Monday evening when large hail, damaging wind and a few tornadoes are possible.

Storms may begin as early as 5:00 p.m. CT from Central Texas to Nebraska and then continue to develop overnight across the region.

By Tuesday morning, storms are projected to impact regions from eastern Nebraska to Kansas City, Missouri, and parts of Iowa. These storms may still be strong and possibly severe.

The strongest storms are anticipated in areas from Des Moines, Iowa, to Columbia, Missouri, on Tuesday afternoon.

Scattered severe thunderstorms are likely on Tuesday into the evening from Chicago to east of Dallas.

On Wednesday morning, there may be lingering strong to severe storms in the Ohio River Valley.