Undated (AP) _ A record-shattering heat wave roasted the East Coast for a fourth straight day Friday, while thunderstorms brought wind, rain and hail to parts of the South.

The nation's flood-ravaged midsection also faced the threat of more rain overnight.

Record heat hit the Northeast for a fourth straight day Friday.

In New York City, the temperature reached 101 degrees in Central Park and 100 at Kennedy International Airport, the latter reading topping a 1981 record for the date by 3 degrees.

The temperature reached 100 degrees at the Atlantic City, N.J., airport, breaking the 1974 record by 5 degrees.

It was even 91 in normally mild Portland, Maine, the third straight day the temperature there topped 90 degrees.

The heat wave was expected to linger through the weekend, and the National Weather Service issued hot-weather warnings for Saturday for New Jersey, Delaware, North Carolina, and parts of New York, Pennsylvania, Maryland and South Carolina.

Cooler temperatures were restricted to the Pacific Northwest, the northern Intermountain region, the northern and central Rockies and the northern Plains, where highs topped out in the 60s and 70s. Everywhere else it was generally sunny and hot.

Strong thunderstorms shook parts of the South, particularly Tennessee, North Carolina and Florida. The storms toppled trees and telephone poles in Morgan County, Tenn., and Yadkinville, N.C., and produced hail an inch in diameter in St. Petersburg, Fla.

The weather service said strong thunderstorms were possible by Saturday morning in parts of the flood-ravaged Midwest, and a flash-flood watch was issued for northwest Missouri.

Showers and thunderstorms were also scattered Friday along the Gulf Coast, through the Tennessee River Valley, across the Great Lakes and over parts of the Atlantic Coast and Rocky Mountains.

Heavier rainfall for the six hours ending at 2 pm EDT included .61 of an inch at Crossville, Tenn., and .52 of an inch at Huntsville, Ala.

While the East Coast was sizzling, record lows were recorded Friday morning in some parts of the northern Plains and interior West. It was 38 in Pocatello, Idaho, breaking the 1959 record by 2 degrees, and 46 in Worland, Wyo., which broke the 1981 record by 3 degrees. The low of 48 in Rapid City, S.D., tied the 1959 record.

The low temperature for the lower 48 states Friday morning was 30 degrees at Truckee, Calif., and Yellowstone National Park, Wyo.