A serious and uncommonly widespread outbreak of severe thunderstorms is expected in the eastern U.S., affecting more than 50 million people from Georgia to New York.
A serious and uncommonly widespread outbreak of severe thunderstorms is expected in the eastern United States, affecting more than 50 million people from Georgia to New York. The storms could unleash destructive winds, hail and a few tornadoes, mainly in the late afternoon and evening hours.
It’s highly probable that tornado or severe thunderstorm watches will be issued early Monday afternoon ahead of the storms. More targeted warnings will be issued when storms are imminent or occurring., including a potentially significant one that initially did not include a tornado warning. A couple tornadoes also formed in Iowa on Saturday.Storms will produce violent downbursts, particularly in the Mid-Atlantic.
A layer of dry, dense air at the mid-levels may mix into thunderstorm downdrafts. That would cause pockets of rain-cooled air to experience “evaporative cooling,” drying out and becoming heavier — and then accelerating toward the ground with even stronger winds.Tornadoes are possible with any of Monday’s storms. The risk will be greatest in the Mid-Atlantic from the central Appalachians through Northern Virginia into central Pennsylvania.
Storms will eventually merge into a fierce line known as a “QLCS” — or a quasi-linear convective system. That will feature widespread straight-line winds and embedded kinks of rotation, any of which could produce erratic, quick-forming and quick-hitting tornadoes. Those tornadoes would come with little warning.Hail would be relegated to initial discrete cells, the majority of which will form within 50 miles of the Pennsylvania-Maryland border.
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