The watch also covers the Finger Lakes, central and northern NY, northern Pennsylvania and part of Vermont.
The thunderstorms are capable of producing damaging rain, wind and hail.
Today is a 9 First Warning Weather Alert Day. It is different from a warning, which means the threat is imminent.
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More afternoon rain and thunderstorms are expected on Wednesday.
At the same time a cold front well to our west is generating some heavy weather that we are keeping an eye on, including a tornado watch. Flash flooding is also possible, especially where storms stall or move slowly over the same areas for a period of an hour or more.
The threat for severe weather will shift eastward Tuesday night as locations from West Virginia through central Pennsylvania, upstate NY and southern Quebec will be at risk.
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The line of storms then crosses New England from west to east overnight.
An unusually strong push of dry, Canadian air will clash with high heat and humidity from the Mississippi Valley through the Ohio Valley, mid-Atlantic and into western New England, said Elliot Abrams, a chief meteorologist at AccuWeather.
Showers and thunderstorms will reach the I-95 corridor late Tuesday night; however, the risk for severe weather will be minimal as the storms lose their punch after midnight.
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