More than 80 million people are under flood protection today, from Alabama to Maine | meteorology

Moisture pouring in from the Gulf of Mexico, along with a persistent near-stationary storm system, will cause slow thunderstorm activity and the possibility of flash flooding in 20 U.S. states Monday.

“Scattered to numerous flash floods (are) possible earlier this week from southern New England to southern Appalachia,” the Weather Prediction Center said.

The same storm system triggered a flash flood emergency in western Georgia on Sunday afternoon.

What used to be thought of as a 1 in 200 year rainfall event that resulted in swollen streams and rivers in the mountainous region, water rescue and flooded homes and businesses was actually a 1 in 1000 year rainfall event. according to analysis by CNN meteorologist Haley Brink.

The area that was flooded yesterday is under fire again today.

The Weather Prediction Center pointed out that a humidity corridor will continue the convection that has plagued the area for the past few days. More thunderstorms could develop, dropping between 1 and 3 inches more rain.

And today the moisture will not be contained in the south.

Flash floods and extreme rainfall hit large populated areas of the Northeast

Flash flood surveillance extends to New England, affecting more than 80 million people, including a long list of major cities: Birmingham, Atlanta, Nashville, Louisville, Cincinnati, Pittsburgh, Philadelphia, New York and Boston.

A flood warning is issued when conditions are favorable for flooding. That doesn’t mean there will be flooding, but it is possible.

The heaviest rainfall is likely to be in the Northeast, where widespread amounts of 2 to 4 inches are possible. Still, isolated areas could see as far as 10 inches, noted CNN meteorologist Rob Shackleford.

“Many pieces of the weather puzzle this morning,” wrote the National Weather Service at State College in Pennsylvania. “The most important finding is that flash floods are possible.”

Parts of the mid-Atlantic and Southeast are more in the 1- to 2-inch range with isolated amounts up to 4-inches, Shackleford reported.

“Flash flooding is becoming more likely over northeastern Pennsylvania, where a moderate risk (Level 3 of 4) has been issued for excessive rainfall,” the Weather Prediction Center said Monday morning.

Sporadic downpours are possible in parts of drought-stricken southern New England.

“Even though this region is currently suffering from severe to extreme drought conditions, several inches of rain falling in a relatively short period of time could still result in flash flooding in areas,” the Weather Prediction Center warned.

Many of the southernmost tide watches expire tonight, and those in the northeast are scheduled to expire Tuesday afternoon.

A low pressure area is expected to develop just off the mid-Atlantic coast on Tuesday.

“This will allow for additional opportunities for heavy rain along the I-95 corridor from Washington DC to Providence, Rhode Island to start the shortened work week,” according to the Weather Prediction Center.

The moisture plume will be along the coast Tuesday morning and moving away from the coast by evening. As such, the greatest amounts of precipitation will fall over New Jersey, the Philadelphia and New York City areas, Long Island and much of Connecticut, the Weather Prediction Center added.

A low risk (level 2 out of 4) of excessive rainfall that could lead to flash flooding was announced by the region’s weather forecasting center on Tuesday.

The CNN Wire

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