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Fox News Weather Center

Monday Storms Threaten Pittsburgh, St. Louis

Severe weather will threaten a large area on Monday and Monday night, stretching from the Northeast, through the Midwest and into the Plains.

Thunderstorms that develop in this area will be the product of two separate systems; a cold front swinging into the Northeast and a wave of low pressure following quickly in its footsteps.

Pittsburgh, Cleveland, Cincinnati, Indianapolis, St. Louis, Omaha, Nebraska, and Des Moines, Iowa, are a few cities that could be impacted by Monday's storms.

It does not appear like any of these storms will reach the I-95 corridor through Monday night with Detroit and Chicago also avoiding the worst of the storms.

Folks in this large area should prepare for the worst as thunderstorms can bring flooding downpours, large hail, damaging wind gusts and even a few tornadoes.

AccuWeather.com meteorologists currently believe that the area at most risk of having a tornado stretches from southeastern South Dakota into central Illinois.

It is important to know the difference between a tornado watch and a tornado warning if you plan on being in the area impacted by Monday's severe storms.

Remember that a tornado watch means that the conditions for tornado development are present, while a tornado warning means that a tornado has been detected.

If you are under a tornado warning, you should seek shelter until the warning has been lifted.

Looking ahead to Tuesday, severe thunderstorms will once again threaten an area from western New York, through the Ohio Valley and into southern Missouri.

Similar to Monday's storms, thunderstorms on Tuesday could lead to urban flooding, hail as large as golf balls, wind strong enough to blow over trees and power lines, and even a few tornadoes.

This will put cities such as Pittsburgh and Cincinnati in the path of severe thunderstorms for a second day in a row.

Fortunately, the severe threat is expected to diminish heading into the middle of the week as the system weakens.

Showers and thunderstorms will still be present across the Northeast on Wednesday, however, threatening outdoor activities from Boston, through New York City and into Washington, D.C.