Washington: Today - Variable cloudiness with showers and thunderstorms likely, high in the mid 80s, low near 70. The chance of rain is 60 percent today, 40 percent tonight. Winds will be light and variable. Tuesday - Partly cloudy with a chance of thunderstorms, high in the 80s.

Maryland: Today - Variable cloudiness with showers and thundershowers likely, highs from the mid 70s to mid 80s, lows in the 60s to low 70s. Tuesday - Partly cloudy with a chance of showers or thundershowers, high in the 80s.

Virginia: Today and Tuesday partly cloudy, warm and humid with a chance of mainly afternoon and evening thundershowers, highs in the 80s to low 90s, lows in the mid 60s to mid 70s.

Extended Area Forecast for Wednesday through Friday - Partly cloudy, warm and humid with a chance of afternoon and evening thundershowers. Highs will range from the low 80s to low 90s, lows from the mid 60s to mid 70s. Normal Washington temperatures are a high of 88 and a low of 69.

Lower Potomac and Chesapeake Bay - Chance of showers and possible thunderstorms. Visibility will be less than 1 mile in rain and morning fog. Winds will [WORD ILLEGIBLE] to the southeast at 10 to 15 knots. Waves will average 1 to 2 feet.

Atlantic Ocean Beaches from New Jersey to Maryland: Today - Variable cloudiness with a chance of showers and thunderstorms, highs in the 70s to near 80. Tuesday - Partly cloudy with showers or thunderstorms, highs in the upper 70s to low 80s. Water temperature will be near 70.

Atlantic Ocean Beaches of Virginia and North Carolina: Today and Tuesday - Partly cloudy, warm and humid with a chance of afternoon or evening thundershowers, high in the 80s. Water temperatures will range from the mid 70s to near 80.

West Virginia: Today and Tuesday - Showers and thunderstorms, with rain heavy at times, highs from the mid 70s to mid 80s, lows in the 60s.

The National Weather Forecast for today - Showers and thunderstorms will be scattered from the Atlantic Coast states west across the Appalachians through the lower Great Lakes region, the Ohio and Tennessee Valleys and the Gulf Coast states. Isolated thundershowers will cover the Rockies and the Arizona Mountains. There is a chance of widely scattered showers over the mid Mississippi Valley, the upper Great Lakes region and Montana. Sunshine will prevail elsewhere. Hot weather will continue over most of the West Coast states and the Intermountain Region. The northern half of the Great Plains, the Great Lakes region, the mid and upper Mississippi Valley eastward through New England and the mid Atlantic Coast states will be mild. The rest of the country will be seasonably warm.

The Council of Governments' Air Quality Index for yesterday showed the high reading in the Washington area during the 1 p.m. period was 55 for the pollutant, photochemical oxidants. Index values between 50 and 99 indicate unhealthy air quality. When the index exceeds 100 the air is considered very unhealthy and individuals with lung, heart and eye ailments are urged to restrict their activity. The forecast for today indicates that the air quality will improve.

The National Weather Service forecasts the Potomac River Stage at Little Falls should fall to near 3.4 feet today.

Almanac Data for today: The sun rises 6:08 a.m., sets 8:20 p.m.; moon rises 3:20 a.m., sets 5:50 p.m. Tides: high 6:21 a.m. and 6:52 p.m., low 1:11 p.m. High and low tides at the following locations may be obtained by subtracting the hours indicated from the hours above: Annapolis (3 1/4), Bloody Point Lighthouse (4 1/2), Deale, Md. (4 1/2), Colonial Beach (5 1/4), Norfolk (1), Virginia Beach (3/4), Solomons Island (6 1/4), Point Lookout (7). Local Temps, Humidity(TABLE) Time(COLUMN)T.(COLUMN)H. 12 mid.(COLUMN)81(COLUMN)72 1 a.m.(COLUMN)80(COLUMN)74 2 a.m.(COLUMN)79(COLUMN)79 3 a.m.(COLUMN)77(COLUMN)88 4 a.m.(COLUMN)77(COLUMN)88 5 a.m.(COLUMN)77(COLUMN)85 6 a.m.(COLUMN)77(COLUMN)85 7 a.m.(COLUMN)77(COLUMN)82 8 a.m.(COLUMN)79(COLUMN)77 9 a.m.(COLUMN)82(COLUMN)72 10 a.m.(COLUMN)84(COLUMN)68 11 a.m.(COLUMN)85(COLUMN)66 12 noon(COLUMN)86(COLUMN)63 1 p.m.(COLUMN)87(COLUMN)59 2 p.m.(COLUMN)86(COLUMN)57 3 p.m.(COLUMN)80(COLUMN)72 4 p.m.(COLUMN)78(COLUMN)82 5 p.m.(COLUMN)80(COLUMN)80 6 p.m.(COLUMN)79(COLUMN)82 7 p.m.(COLUMN)78(COLUMN)89(END TABLE) Temperatures ending 8 a.m. (EDT) yesterday:(TABLE) City(COLUMN)H(COLUMN)L Albany(COLUMN) 74(COLUMN)63 Albuquerque(COLUMN)103(COLUMN)75 Amarillo(COLUMN) 95(COLUMN)69 Anchorage(COLUMN) 72(COLUMN)57 Asheville(COLUMN) 87(COLUMN)59 Atlanta(COLUMN) 92(COLUMN)70 Atlantic City(COLUMN) 79(COLUMN)72 Austin(COLUMN) 95(COLUMN)74 Baltimore(COLUMN) 87(COLUMN)75 Billings(COLUMN) 89(COLUMN)56 Birmingham(COLUMN) 92(COLUMN)74 Bismarck(COLUMN) 69(COLUMN)51 Boise(COLUMN) 95(COLUMN)63 Boston(COLUMN) 73(COLUMN)68 Brownsville(COLUMN) 97(COLUMN)76 Buffalo(COLUMN) 74(COLUMN)57 Burlington, Vt.(COLUMN) 71(COLUMN)56 Casper(COLUMN) 87(COLUMN)53 Charleston, S.C.(COLUMN) 93(COLUMN)76 Charleston, W.Va.(COLUMN) 86(COLUMN)70 Charlotte(COLUMN) 90(COLUMN)70 Cheyenne(COLUMN) 75(COLUMN)54 Chicago(COLUMN) 78(COLUMN)60 Cincinnatl(COLUMN) 87(COLUMN)66 Cleveland(COLUMN) 87(COLUMN)65 Columbia, S.C.(COLUMN) 93(COLUMN)71 Columbus(COLUMN) 85(COLUMN)65 Dal.-Ft. Worth(COLUMN)101(COLUMN)74 Dayton(COLUMN) 84(COLUMN)64 Denver(COLUMN) 86(COLUMN)58 Des Moines(COLUMN) 77(COLUMN)64 Detroit(COLUMN) 84(COLUMN)58 Duluth(COLUMN) 66(COLUMN)48 El Paso(COLUMN) 97(COLUMN)71 Evansville(COLUMN) 95(COLUMN)72 Fairbanks(COLUMN) 83(COLUMN)55 Fargo(COLUMN) 71(COLUMN)55 Flagstaff(COLUMN) 90(COLUMN)58 Great Falls(COLUMN) 87(COLUMN)53 Hartford(COLUMN) 83(COLUMN)66 Helena(COLUMN) 91(COLUMN)54 Honolulu(COLUMN) 86(COLUMN)72 Houston(COLUMN) 94(COLUMN)79 Indianapolis(COLUMN) 91(COLUMN)68 Jackson(COLUMN) 94(COLUMN)77 Jacksonville(COLUMN) 90(COLUMN)73 Juneau(COLUMN) 76(COLUMN)42 Kansas City(COLUMN) 92(COLUMN)66 Las Vegas(COLUMN)109(COLUMN)80 Little Rock(COLUMN)100(COLUMN)77 Los Angeles(COLUMN) 83(COLUMN)62 Louisville(COLUMN) 93(COLUMN)70 Memphis(COLUMN) 96(COLUMN)79 Miami Beach(COLUMN) 89(COLUMN)74 Midland(COLUMN) 90(COLUMN)70 Milwaukee(COLUMN) 77(COLUMN)58 Mpls.-St. Paul(COLUMN) 75(COLUMN)53 Nashville(COLUMN) 93(COLUMN)75 New Orleans(COLUMN) 94(COLUMN)78 New York(COLUMN) 79(COLUMN)73 Norfolk(COLUMN) 87(COLUMN)72 North Platte(COLUMN) 80(COLUMN)58 Okahoma City(COLUMN)103(COLUMN)75 Omaha(COLUMN) 77(COLUMN)61 Orlando(COLUMN) 89(COLUMN)73 Philadelphia(COLUMN) 83(COLUMN)78 Phoenix(COLUMN)112(COLUMN)82 Pittsburgh(COLUMN) 87(COLUMN)65 Portland, Me.(COLUMN) 76(COLUMN)60 Portland, Ore.(COLUMN) 88(COLUMN)60 Providence(COLUMN) 79(COLUMN)67 Raleigh(COLUMN) 91(COLUMN)71 Rapid City(COLUMN) 77(COLUMN)57 Reno(COLUMN) 96(COLUMN)51 Richmond(COLUMN) 90(COLUMN)71 St. Louis(COLUMN) 94(COLUMN)70 St. Prbg.-Tampa(COLUMN) 91(COLUMN)78 Salt Lake City(COLUMN) 97(COLUMN)63 San Antonio(COLUMN) 95(COLUMN)75 San Diego(COLUMN) 78(COLUMN)69 San Francisco(COLUMN) 59(COLUMN)52 San Juan(COLUMN) 91(COLUMN)81 St. Ste. Marie(COLUMN) 69(COLUMN)42 Seattle(COLUMN) 81(COLUMN)55 Shreveport(COLUMN) 97(COLUMN)75 Sioux Falls(COLUMN) 69(COLUMN)59 Spokane(COLUMN) 91(COLUMN)59 Syr acuse(COLUMN) 73(COLUMN)59 Topeka(COLUMN) 91(COLUMN)62 Tucson(COLUMN)103(COLUMN)77 Tulsa(COLUMN)106(COLUMN)80 Washington(COLUMN) 89(COLUMN)77 Wichita(COLUMN)109(COLUMN)70(END TABLE) Temperatures Abroad Yesterday(TABLE) City(COLUMN)Weather(COLUMN)Time(COLUMN)T Aberdeen(COLUMN)cloudy(COLUMN)1 p.m.(COLUMN)55 Amsterdam(COLUMN)clear(COLUMN)1 p.m.(COLUMN)86 Ankara(COLUMN)cloudy(COLUMN)3 p.m.(COLUMN)77 Athens(COLUMN)clear(COLUMN)2 p.m.(COLUMN)84 Auckland(COLUMN)cloudy(COLUMN)midnight(COLUMN)52 Berlin(COLUMN)clear(COLUMN)1 p.M.(COLUMN)84 Birmingham(COLUMN)rain(COLUMN)1 p.m.(COLUMN)61 Bonn(COLUMN)clear(COLUMN)1 p.m.(COLUMN)86 Brussels(COLUMN)clear(COLUMN)1 p.m.(COLUMN)86 Cairo(COLUMN)clear(COLUMN)2 p.m.(COLUMN)88 Casablanca(COLUMN)clear(COLUMN)noon(COLUMN)73 Copenhagen(COLUMN)clear(COLUMN)1 p.m.(COLUMN)79 Dublin(COLUMN)cloudy(COLUMN)1 p.m.(COLUMN)64 Geneva(COLUMN)clear(COLUMN)1 p.m.(COLUMN)81 Hong Kong(COLUMN)cloudy(COLUMN)8 p.m.(COLUMN)81 Jerusalem(COLUMN)clear(COLUMN)2 p.m.(COLUMN)82 Lisbon(COLUMN)clear(COLUMN)noon(COLUMN)73 London(COLUMN)rain(COLUMN)1 p.m.(COLUMN)66 Madrid(COLUMN)pt. cldy.(COLUMN)1 p.m.(COLUMN)88 Malta(COLUMN)clear(COLUMN)1 p.m.(COLUMN)84 Manila(COLUMN)pt. cldy.(COLUMN)8 p.m.(COLUMN)84 Moscow(COLUMN)clear(COLUMN)3 p.m.(COLUMN)72 New Delhi(COLUMN)cloudy(COLUMN)5 p.m.(COLUMN)90 Nice(COLUMN)clear(COLUMN)1 p.m.(COLUMN)79 Oslo(COLUMN)clear(COLUMN)1 p.m.(COLUMN)75 Paris(COLUMN)cloudy(COLUMN)1 p.m.(COLUMN)72 Peking(COLUMN)cloudy(COLUMN)8 p.m.(COLUMN)79 Rome(COLUMN)clear(COLUMN)1 p.m.(COLUMN)84 Saigon(COLUMN)cloudy(COLUMN)8 p.m.(COLUMN)81 Sofia(COLUMN)pt. cldy.(COLUMN)2 p.m.(COLUMN)73 Stockholm(COLUMN)pt. cldy.(COLUMN)1 p.m.(COLUMN)79 Sydney(COLUMN)clear(COLUMN)10 p.m.(COLUMN)48 Tokyo(COLUMN)clear(COLUMN)9 p.m.(COLUMN)82 Vienna(COLUMN)clear(COLUMN)1 p.m.(COLUMN)81 Warsaw(COLUMN)clear(COLUMN)1 p.m.(COLUMN)81(END TABLE) Temperatures (Western Hemisphere)(TABLE) City(COLUMN)Weather(COLUMN)High(COLUMN)Low Acapulco(COLUMN)fair(COLUMN)88(COLUMN)79 Barbados(COLUMN)cloudy(COLUMN)88(COLUMN)75 Bermuda(COLUMN)pt. cldy.(COLUMN)87(COLUMN)77 Calgary(COLUMN)cloudy(COLUMN)75(COLUMN)54 Edmonton(COLUMN)clear(COLUMN)73(COLUMN)54 Havana(COLUMN)pt. cldy.(COLUMN)90(COLUMN)75 Kingston(COLUMN)fair(COLUMN)90(COLUMN)80 Montego Bay(COLUMN)fair(COLUMN)91(COLUMN)73 Mexico City(COLUMN)pt. cldy.(COLUMN)76(COLUMN)57 Monterrey(COLUMN)pt. cldy.(COLUMN)94(COLUMN)73 Montreal(COLUMN)rain(COLUMN)68(COLUMN)57 Nassau(COLUMN)pt. cldy.(COLUMN)90(COLUMN)75 Ottawa(COLUMN)rain(COLUMN)64(COLUMN)54 Regina(COLUMN)pt. cldy.(COLUMN)75(COLUMN)48 St. Kitts(COLUMN)pt. cldy.(COLUMN)88(COLUMN)79 St. Thomas(COLUMN)pt. cldy.(COLUMN)92(COLUMN)79 Toronto(COLUMN)cloudy(COLUMN)77(COLUMN)57 Vancouver(COLUMN)clear(COLUMN)77(COLUMN)55 Veracruz(COLUMN)pt. cldy.(COLUMN)85(COLUMN)73 Winnipeg(COLUMN)pt. cldy.(COLUMN)72(COLUMN)54(END TABLE)