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(CNN) -
Severe weather, including possible tornadoes, large hail and damaging winds, will threaten more than 90 million people in the Midwest and Northeast on Wednesday, according to forecasts.
"Although large hail will be possible [with thunderstorms], wind damage is the most prevalent severe threat," according to the Storm Prediction Center in reference to the Midwest.
The center forecast similar weather in the northeast, with strong winds being the biggest concern.
A storm system is moving from the northwestern US to the Midwest, causing these storms to develop.
According to the Storm Prediction Center, there is a level 3 (out of 5) risk for parts of Minnesota, Iowa, Illinois and Wisconsin.
This includes Madison, Wisconsin;
Cedar Rapids, Iowa and Rochester, Minnesota.
There is also risk, albeit less, in cities like Chicago, Minneapolis, Milwaukee, Des Moines and Omaha.
The Midwest Storm Prediction Center's severe weather outlook from Wednesday night.
The risk ranges from low (green) to high (red), depending on the color.
Rains in the beginning
The day begins with showers and thunderstorms over the northern plains and western portions of the Midwest.
There will be some heavier pockets of rain and perhaps an isolated storm.
But as this moisture shifts toward the Midwest, the risk of severe weather will increase.
In the afternoon, some of the thunderstorms are expected to become severe as they move into parts of Minnesota and Iowa.
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"The [storm] complex will have the potential for widespread damaging winds, but stronger updrafts could produce larger hail as well," according to the office of the Twin Cities National Weather Service.
The storms will continue their way east into the afternoon, likely reaching Lake Michigan in the evening.
However, some places will have more than one round of strong to severe storms.
A line of storms is expected to form over parts of the Midwest late Wednesday afternoon and continue south and east until late at night.
These storms could bring damaging winds, tornadoes, and large hail.
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"These storms will continue east through roughly the same corridor as the morning storms, further justifying the current risk area [level 3 of 5]," says the Storm Prediction Center.
Flash floods are likely and some towns are expected to receive more than 75 millimeters of rain.
The severe threat will shift to the Central Plains and Lower Midwest by Thursday, with heavy storm coverage expected to be isolated.
Isolated severe storms for the Northeast
A separate storm system over southeastern Canada will be responsible for isolated severe storms in the northeast.
The Storm Prediction Center has a high risk, level 2, for the central parts of New York and New England, which includes Albany and Springfield.
There is also a Level 1 risk in much of the Northeast region, including New York, Washington, Philadelphia and Boston.
Severe weather outlook from the Northeast Storm Prediction Center on Wednesday.
"Some storms tomorrow could be strong to potentially severe, with damaging winds being the main threat," says the New York National Weather Service office.
Hot and humid weather can help fuel heavy storms.
High temperatures will be near or above 32.2 ° Celsius as far north as New York City on Wednesday afternoon.
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Some showers and thunderstorms will be present in the morning near the eastern Great Lakes and the US-Canada border.
These storms are not expected to be severe.
As they move east in the afternoon, these storms will spread a little further and some will become severe as they approach the I-95 corridor.
Isolated flash floods could be possible, with heavy downpours associated with these storms, but they will be fast-moving compared to flash floods in parts of the region on Monday.
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