Heavy showers on Monday afternoon and evening are likely to cause flash flooding in and around the Philadelphia area. Showers are expected to begin around noon in Philadelphia and peak rainfall is expected to occur during dinner time. The National Weather Service says localized rainfall of 3-5 inches is possible.

FLOODED ROADSA band of over 3" of rain over a short period of time has fallen along Route 1 through southern Chester and Delaware Counties leading to numerous reports of flooded roadways and stranded vehicles. Avoid driving in this area. Flash flood warnings are in effect. pic.twitter.com/dh9TXhNN1c

So observes Sarah Johnson, the warning coordination meteorologist at the National Weather Service office in Mount Holly, which yet again has posted a flash flood watch, this one from 2 p.m. Monday until 2 a.m Tuesday.

Garnet Valley High School is recovering from significant flood damage after a powerful thunderstorm hit Delaware County, Pennsylvania, last week. Wednesday's storm left multiple areas of the building under water and disrupted several summer programs.

Scattered storms are on the move with periods of heavy rainfall and it's expected to last into the early morning hours of Thursday.

The National Oceanic and Atmospheric Administration Storm Prediction Center had Philadelphia and most of Pennsylvania and New Jersey under a severe thunderstorm watch. The weather service said the amount of energy available to ignite storms Tuesday was near or above the “extreme” level.

Flash flood warnings on Monday in parts of New Jersey, New York and Pennsylvania have many homeowners thinking about the worst-case scenario.

As crews search for missing people after flash floods killed at least 120 in Texas, cities across the U.S. grapple with rising flood waters.

Over 3,400 residential properties in Philadelphia are covered by flood insurance policies through the National Flood Insurance Program, which provides most flood insurance nationwide. For single-family homes, including rowhouses, the median annual cost is currently $870, according to FEMA. Some homeowners, like Anita Barnes, pay much more.

A water main break sent brown water gushing through a North Philadelphia neighborhood Monday morning, filling roadways and sidewalks. At least 50 properties were without water due to the break, but service has since been restored.