Severe thunderstorms will become more numerous Friday into the weekend from the Upper Midwest into the Northeast as building heat and humidity interact with an active jet stream.
Severe weather has been spotty this week. Wednesday, a line of severe thunderstorms produced wind damage in eastern Pennsylvania, including Philadelphia, and across southern New Jersey, including Atlantic City.
The increase in severe weather beginning Friday will be triggered by a strong disturbance, riding along with the jet stream, from the northern Great Lakes region on Friday to the lower Great Lakes and parts of the mid-Atlantic states Saturday.
The main severe threats will be damaging winds and large hail. The probability of tornadoes appears to be low, but isolated tornadoes can occur in these situations.
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