Along with the risk of damaging thunderstorm winds, there is an elevated threat of flash and urban flooding in the Northeast into Saturday.
Torrential downpours have and will continue to cause transportation delays from Virginia to Maine.
Multiple lines of slow-moving, repeating showers and thunderstorms will unload heavy rainfall on the region into Saturday.
The pattern has the potential to unload a general 1 to 2 inches with local amounts of 4 inches. While this may not seem so bad, a significant amount of this ran can fall in several hours or less.
Rainfall rates of an inch per hour can easily overwhelm storm drains causing water to flood streets and basements.
Small streams can rapid rise and overflow their bands.
The central Appalachians were slammed by torrential downpours Thursday night, and more downpours are on the way for the mountains and valleys into Friday evening.
According to Severe Weather Expert Henry Margusity, "During Friday midday, the storms were slamming areas from Philadelphia to New York City in response to an area of low pressure embedded within the shower and thunderstorm regime."
Mass transit, street and highway delays are likely.
"This feature will move on into Hartford, Boston and other locations in New England during the afternoon and evening hours Friday," Margusity added.
The showers and thunderstorms will slowly retreat toward the Atlantic Ocean over the weekend. However, downpours will still plague the I-95 corridor from Richmond to Portland, Maine, on Saturday. Even on Sunday, a downpour is possible on area beaches from the Outer Banks of North Carolina to Cape Cod and Down East Maine.
A complex of thunderstorms is forecast to hit areas from Dallas to Abilene, Texas late Monday night into Tuesday.
Weather favoring the spread of wildfires will increase over California, Nevada, Utah and Arizona Tuesday into Wednesday.
Join us this Thursday for another edition of AccuWeather LIVE, where we will answer your questions and discuss hurricane season and the start of summer.
Strong, fast-moving storms will impact Boston and Hartford through Monday evening.
Strong storms are occurring across the South Monday night.
Ahead of the thunderstorms, temperatures will soar to between 85 and 95 degrees, mostly 15 to 20 degrees above normal, on the hottest one to three days between north-central France and Poland.
Wellesly Hills, MA (1998)
2.35" of rain in 35 minutes.
East Coast (1893)
Hurricane arrived off Cape Cod, after crossing Florida and sweeping the Southeast coast.
Indianapolis, IN (1992)
The control tower at the airport was evacuated early in the morning during a severe thunderstorm. One-inch hailstones fell, a 62 mph wind gust occurred, and a tornado was spotted two miles northwest of the airport.