Thursday, November 26, 2015

Flood threat in context

Heavy rains coming, but major river flooding a long shot.

Flood threat in context

Flooding from Irene in 2011; some stream flooding in the Philadelphia region is likely the next few days. (Alejandro A. Alvarez/Staff)
Flooding from Irene in 2011; some stream flooding in the Philadelphia region is likely the next few days. (Alejandro A. Alvarez/Staff)

The area-wide flood watch remains in effect through Thursday morning with from 3 to as much as 5 inches of rain expected.

Based on forecast rainfall amounts, the National Weather Service says minor flooding along streams is likely and  moderate to major flooding is at least possible.

Rises are anticipated on the major rivers, but any significant flooding on the Delaware River and Schuylkill is unlikely. Of course that could change.

But the region has a few things going for it in terms of avoiding catastrophic flooding.

For one thing, rainfall for April has been well below normal, and the awakening plant life is primed to take a stiff drink or two.

And thanks to the recent dryness, rivers and streams are quite low.

For example, the Delaware River at Trenton stood at 9.2 feet at midmorning; flood stage is 20 feet.

The gage on the Schuylkill at Norristown was reading about 8.5 feet; flood stage is 17. The Chester Creek was down to 2.9 feet, better than 6 feet below flood stage.

Still, that’s a ton of rain in the forecast, about a month’s worth. The heaviest rain is due late tonight and is expected to continue into Wednesday night.

Inquirer Weather Columnist
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About this blog

Everyone talks about the weather, and here we write about it.

When we’re around and conditions warrant, we’ll keep you updated about what’s coming, but we will do our best always to discuss weather and climate developments in context and remind you that nothing in the atmosphere happens in a vacuum.

Tony Wood has been writing about the atmosphere for The Inquirer for 26 years.

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Tony Wood Inquirer Weather Columnist
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