Saturday, April 18, 2015

Flood watch: Here's why

A decent blob of rain is on the way.

Flood watch: Here's why

A flash flood watch now is in effect until 4 p.m. for Philadelphia and surrounding counties on both sides of the river.

Should it hold together a substantial slug of rain should cross the region around lunchtime and continue until mid-afternoon. Here is the latest radar image from

What happened yesterday showed how quickly creeks can respond to rainfall. The flow of Pennypack Creek, the site of a dramatic rescue and a drowning, became dangerous in a hurry.

It was running at 52 cubic feet per second at 8:30, and it jumped to 2,560 cubic feet per second by 11:15 a.m.

This morning, it will be starting at a higher base. It was at 218 cubic feet per second as of 11:15.

The National Weather Service, which issued the flood watch, says up to 2 inches could fall in some places in the next round of rain.

Inquirer Weather Columnist
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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