Undated (AP) _ Cool, cloudy weather swept across the Midwest and Northeast today, with temperatures hitting record lows in the 30s and 40s around the Great Lakes and across the Ohio Valley into the Appalachians.

A low-pressure system carried showers into New England, and scattered showers also were expected in Minnesota, Wisconsin and the southern Plains.

Youngstown, Ohio, chilled to a record low of 34 early today - the second full day of summer - toppling the former record of 41 set in 1958. Also in Ohio, Akron and Cleveland hit record lows of 39 and Zanesville reported a record low of 38.

Green Bay, Wis., dropped to a record 40, erasing a record that had stood since 1902. In the rugged hills of West Virginia, Elkins and Beckley had records of 38 and Bluefield and Parkersburg hit 39.

The unseasonably cold weather came from the northwest, more typical of winter than summer, said Weather Service Service meteorologist Barry Gooden in Charleston, W.Va.

''It could almost be described as Alberta Clipper-type conditions in that the air mass has been coming out of the Pacific northwest,'' Gooden said. ''That's a bit unusual for this time of year.''

Other record lows included 46 at Roanoke, Va.; 48 at Atlantic City, N.J.; 45 at Paducah, Ky.; 43 at Champaign, Ill.; 43 at Binghamton, N.Y.; and 37 at Indianapolis. Elsewhere, Calico Rock, Ark., fell to a record low of 45.

On Sunday, storms in the Carolinas pummeled buildings and crops with hail the size of golf balls.

Rain and thunderstorms extended across New England, the southern Atlantic Coast, the Ohio Valley, Louisiana, eastern Texas, the Rockies and the western Plains.

Temperatures today were forecast in the 50s and 60s in the Northeast; the 70s in the mid-Atlantic states, the Appalachians, the Midwest and northern Plains; the 80s in most of the Southeast, the rest of the Plains and the northern Rockies; the 90s in most of the West; and over 100 in parts of the Northwest and Southwest.

High temperature records for Sunday include 110 degrees in Red Bluff, Calif., breaking the 1954 record of 109; and 106 in Medford, Ore., beating the 1990 record of 104.

The high temperature for the nation Sunday was 113 at Lake Havasu City, Ariz.

Other reports as of 3 a.m. EDT (Atmospheric conditions not available in some cities):

-East: Albany, N.Y., 46 fair; Atlanta 60 fair; Boston 61 cloudy; Buffalo 45 cloudy; Charleston, S.C., 70 cloudy; Chattanooga 54 fair; Cincinnati 49; Cleveland 40; Detroit 46 fair; Hatteras 67 cloudy; Jacksonville 78 partly cloudy; Key West 84 fair; Knoxville 53 fair; Macon 63 partly cloudy; Miami 80; New York 57 partly cloudy; Philadelphia 54 partly cloudy; Pittsburgh 44; Portland, Maine, 57 showers; Richmond 50; Tampa 81 fair; Washington, D.C., 52.

-Central: Birmingham 54 fair; Bismarck 56 fair; Chicago 49; Denver 60 fair; Des Moines 56 cloudy; Fort Worth 70 cloudy; Indianapolis 43; Kansas City 59; Little Rock 58 partly cloudy; Louisville 51; Memphis 57; Nashville 55; New Orleans 77; North Platte 63 cloudy; Oklahoma City 61 fair; Omaha 64 partly cloudy; Rapid City 59 fair; St. Louis 56; Minneapolis-St. Paul 57 cloudy; San Antonio 76 partly cloudy.

-West: Albuquerque 63 fair; Anchorage 52 cloudy; Boise 71; Casper 60 fair; Fairbanks 56 showers; Great Falls 59 fair; Honolulu 77 fair; Las Vegas 82 fair; Los Angeles 60 foggy; Medford 76; Pendleton 72 fair; Phoenix 91 cloudy; Portland, Ore., 76; Reno 69; Salt Lake City 65; San Diego 64 partly cloudy; San Francisco 62 partly cloudy; Seattle 72; Spokane 66.

-International: Calgary 59 fair; Montreal 52 partly cloudy; Ottawa 48 rain; Regina 57 partly cloudy; Toronto 43; Winnipeg 54 cloudy; Acapulco 82 fair; Bermuda 77; Kingston 81; Nassau 81; San Juan 80 partly cloudy.