Washington: Today - Cloudy, rain possible, high in mid 60s, low in mid 50s. The chance of rain is 50 per cent through tonight. Wind will be from light and variable. Thursday - Partly cloudy, high in the mid 70s.

Maryland and Virginia: Today - Cloudy, rain possible, highs in the 60s, low from the mid 40s to the mid 50s. Thursday - Partly cloudy, highs from the mid 60s to the 70s.

Lower Patomac and Chesapeake Bay. Today - Rain possible, visibility of less than 3 miles. Wind will be variable, but mostly southerly at near 10 knots through tonight. Waves in unprotected waters will be less than 2 feet.

Extended Area Forecast for Friday through Sunday: Fair through the period, except for a chance of rain on Sunday evening. Highs will be from the low 70s to the 90s lows from the 50s to the 60s. Normal Washington temperatures for the period are high of 78 and a low of 57.

West Virginia: Today - Cloudy, highs from the mid 50s to the low 60s, lows from the mid 40s to the low 50s. Thursday - Cloudy, highs from the mid 50s to the mid 60s.

The National Weather Forecast for today - Showers will fall across the northern and central Plains and Rockies. A band of thunder-showers will extend from central Mississippi eastward across north-eastern Florida and southeastern Georgia. Rain will fall from the upper Ohio Valley and lower Great Lakes eastward across the middle east and northern Atlantic Coast. Warm to mild temperatures will be found across most of Florida, Texas and up the Mississippi Valley to the Canadian border. Cool temperatures will be found elsewhere. Skies will be mostly sunny elsewhere.

Almanac Data for today: The sun rises 5:54 a.m. sets 8:15 p.m.; moon rises 3:05 p.m., sets 2:55 a.m. Tides: high 4:16 a.m., and 4:36 p.m., low 11:23 a.m., and 11:35 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).

The Council of Government's Air Quality Index for yesterday showed the high reading in the Washington area during the 2 p.m. to 3 p.m. period was 12 for the pollutant, carbon monoxide. Index values between zero and 24 indicate good air quality. When the index exceeds 100 the air is considered very unhealthy and individuals with lung, heart and eye ailments are urged to restric their activity. The forecast for today indicates that the air quality will be good.

The National Weather Service forecasts the Potomac River stage at Little Falls should be near 10 feet today. Local Temps, Humidity(TABLE) Time(COLUMN)T(COLUMN)H 12 m'night(COLUMN)59(COLUMN)90 1 a.m.(COLUMN)58(COLUMN)90 2 a.m.(COLUMN)58(COLUMN)87 3 a.m.(COLUMN)59(COLUMN)87 4 a.m.(COLUMN)59(COLUMN)87 4 a.m.(COLUMN)58(COLUMN)90 5 a.m.(COLUMN)58(COLUMN)90 6 a.m.(COLUMN)57(COLUMN)90 7 a.m.(COLUMN)57(COLUMN)87 8 a.m.(COLUMN)57(COLUMN)90 9 a.m.(COLUMN)57(COLUMN)87 10 a.m.(COLUMN)56(COLUMN)87 11 a.m.(COLUMN)57(COLUMN)90 12 noon(COLUMN)57(COLUMN)90 1 p.m.(COLUMN)57(COLUMN)90 2 p.m.(COLUMN)58(COLUMN)87 3 p.m.(COLUMN)59(COLUMN)87 4 p.m.(COLUMN)60(COLUMN)84 5 p.m.(COLUMN)60(COLUMN)84 6 p.m.(COLUMN)59(COLUMN)84 7 p.m.(COLUMN)59(COLUMN)84(END TABLE) Temperatures ending 8 a.m. (EDT) yesterday:(TABLE) City(COLUMN)H(COLUMN)L Albany(COLUMN) 55(COLUMN)50 Albuquerque(COLUMN) 87(COLUMN)56 Amarillo(COLUMN) 97(COLUMN)57 Anchorage(COLUMN) 62(COLUMN)45 Ashville(COLUMN) 56(COLUMN)38 Atlantic City(COLUMN) 53(COLUMN)45 Atlanta(COLUMN) 65(COLUMN)45 Austin(COLUMN) 93(COLUMN)74 Baltimore(COLUMN) 61(COLUMN)54 Billings(COLUMN) 90(COLUMN)49 Birmingham(COLUMN) 67(COLUMN)45 Bismarck(COLUMN) 76(COLUMN)56 Boise(COLUMN) 71(COLUMN)38 BOston(COLUMN) 51(COLUMN)49 Brownsville(COLUMN) 93(COLUMN)78 Buffalo(COLUMN) 61(COLUMN)50 Burlington(COLUMN) 57(COLUMN)50 Casper(COLUMN) 36(COLUMN)53 Charlest'n, S.C.(COLUMN) 75(COLUMN)56 Ch'rls'tn, W. Va.(COLUMN) 58(COLUMN)50 Charlotte(COLUMN) 58(COLUMN)42 Cheyenne(COLUMN) 83(COLUMN)47 Chicago(COLUMN) 56(COLUMN)51 Incinnati(COLUMN) 58(COLUMN)50 Cleveland(COLUMN) 64(COLUMN)50 Columbia, S.C.(COLUMN) 67(COLUMN)46 Columbus, Ohio(COLUMN) 57(COLUMN)52 Dal-Ft. Worth(COLUMN) 94(COLUMN)71 Dayton(COLUMN) 58(COLUMN)52 Denver(COLUMN)87(COLUMN)42 Des Moines(COLUMN) 65(COLUMN)55 Detroit(COLUMN) 55(COLUMN)51 Duluth(COLUMN) 60(COLUMN)45 El Paso(COLUMN) 99(COLUMN)68 Fairbanks(COLUMN) 60(COLUMN)39 Fargo(COLUMN) 74(COLUMN)55 Flagstaff(COLUMN) 72(COLUMN)36 Great Falls(COLUMN) 77(COLUMN)41 Hartford(COLUMN) 52(COLUMN)49 Helena(COLUMN) 79(COLUMN)45 Honolulu(COLUMN) 85(COLUMN)74 Houston(COLUMN) 92(COLUMN)74 Indianapolis(COLUMN) 58(COLUMN)56 Jackson, Miss.(COLUMN) 83(COLUMN)57 Jacksonville(COLUMN) 84(COLUMN)61 Juneau(COLUMN) 63(COLUMN)47 Kansas City(COLUMN) 64(COLUMN)47 Las Vegas(COLUMN) 91(COLUMN)60 Little Rock(COLUMN) 78(COLUMN)51 Los Angeles(COLUMN) 75(COLUMN)60 Louisville(COLUMN) 59(COLUMN)50 Memphis(COLUMN) 69(COLUMN)52 Miami Beach(COLUMN) 88(COLUMN)71 Midland Odesa(COLUMN)100(COLUMN)62 Milwaukee(COLUMN) 54(COLUMN)47 Mpis-St Paul(COLUMN) 71(COLUMN)52 Nashville(COLUMN) 54(COLUMN)51 New Orleans(COLUMN) 92(COLUMN)65 New York(COLUMN) 54(COLUMN)50 Norfolk(COLUMN) 69(COLUMN)59 North Platte(COLUMN) 80(COLUMN)48 Loklahoma City(COLUMN) 87(COLUMN)59 Omaha(COLUMN) 73(COLUMN)48 Orange(COLUMN)88(COLUMN)66 Philadephia(COLUMN) 56(COLUMN)52 Phoenix(COLUMN) 99(COLUMN)67 Pittsburg(COLUMN) 57(COLUMN)52 Portland, Maine(COLUMN) 48(COLUMN)46 Portland, Ore.(COLUMN) 59(COLUMN)44 Province(COLUMN) 51(COLUMN)47 Raleigh(COLUMN) 59 47 Rapid City(COLUMN) 87(COLUMN)50 Reno(COLUMN) 57(COLUMN)33 Richmond(COLUMN) 69(COLUMN)54 St. Louis(COLUMN) 60(COLUMN)54 St. Prbg-Tampa(COLUMN) 83(COLUMN)75 Salt Lake City(COLUMN) 86(COLUMN)42 San Antonio(COLUMN) 90(COLUMN)74 San Francisco(COLUMN) 61(COLUMN)53 San Juan(COLUMN) 87(COLUMN)74 St.Ste Marie(COLUMN) 73(COLUMN)48 Seattle(COLUMN) 60(COLUMN)48 Shreveport(COLUMN) 92(COLUMN)63 Sioux Falls(COLUMN) 73(COLUMN)48 Spokane(COLUMN) 56(COLUMN)44 Syracuse(COLUMN) 60(COLUMN)50 Topeka(COLUMN) 74(COLUMN)44 Tucson(COLUMN) 96(COLUMN)63 Tulsa(COLUMN) 81(COLUMN)53 Washington(COLUMN) 68(COLUMN)56 Wichita(COLUMN) 79(COLUMN)49(END TABLE) Temperature Abroad Yesterday(TABLE) City(COLUMN)Weather(COLUMN)Time(COLUMN)Temp Aberdeen(COLUMN)pt. cldy(COLUMN) 1 p.m.(COLUMN) 57 Amsterdam(COLUMN)Pt. cldy(COLUMN) 1 p.m.(COLUMN) 55 Ankara(COLUMN)pt. cldy(COLUMN) 3 p.m.(COLUMN) 72 Athens(COLUMN)clear(COLUMN) 2 p.m.(COLUMN) 73 Auckland(COLUMN)clear(COLUMN)midnight(COLUMN) 52 Berlin(COLUMN)pt. cldy(COLUMN) 1 p.m.(COLUMN) 59 Birmingham(COLUMN)clear(COLUMN) 1 p.m.(COLUMN) 57 Brussels(COLUMN)cloudy(COLUMN) 1 p.m.(COLUMN) 57 Cairo(COLUMN)pt. cldy(COLUMN) 2 p.m.(COLUMN) 95 Casablanca(COLUMN)cloudy(COLUMN) noon(COLUMN) 63 Copenhagen(COLUMN)pt. cldy(COLUMN) 1 p.m.(COLUMN)52 Dublin(COLUMN)clear(COLUMN) 1 p.m.(COLUMN) 55 Geneva(COLUMN)cloudy(COLUMN) 1 p.m.(COLUMN) 55 Hong Kong(COLUMN)cloudy(COLUMN) 8 p.m.(COLUMN) 75 Jerusalem(COLUMN)pt. cldy(COLUMN) 2 p.m.(COLUMN) 90 Lisbon(COLUMN)cloudy(COLUMN) noon(COLUMN) 63 London(COLUMN)clear(COLUMN) 1 p.m.(COLUMN) 59 Madrid(COLUMN)pt. cldy(COLUMN) 1 p.m.(COLUMN)70 Malta(COLUMN)clear(COLUMN) 1 p.m.(COLUMN) 68 Manila(COLUMN)clear(COLUMN) 8 p.m.(COLUMN) 84 Moscow(COLUMN)cloudy(COLUMN) 3 p.m.(COLUMN) 61 New Delhi(COLUMN)clear(COLUMN) 5 p.m.(COLUMN)108 Nice(COLUMN)pt. cldy(COLUMN) 1 p.m.(COLUMN) 63 Osio(COLUMN)cloudy(COLUMN) 1 p.m.(COLUMN) 55 Paris(COLUMN)cloudy(COLUMN) 1 p.m.(COLUMN) 59 Peking(COLUMN)cloudy(COLUMN) 1 p.m.(COLUMN) 57 Rome(COLUMN)clear(COLUMN) 1 p.m.(COLUMN) 66 Saigon(COLUMN)cloudy(COLUMN) 8 p.m.(COLUMN) 86 Sofia(COLUMN)pt. cldy(COLUMN) 2 p.m.(COLUMN) 63 Sotckholm(COLUMN)rain(COLUMN) 1 p.m.(COLUMN) 45 Sydney(COLUMN)cloudy(COLUMN)10 p.m.(COLUMN) 63 Tokyo(COLUMN)cloudy(COLUMN) 9 p.m.(COLUMN) 68 Tunis(COLUMN)clear(COLUMN) 1 p.m.(COLUMN) 73 Vienna(COLUMN)rain(COLUMN) 1 p.m.(COLUMN) 55 Warsaw(COLUMN)clear(COLUMN) 1 p.m.(COLUMN) 57(END TABLE) Temperature (Western Hemisphere)(TABLE) City(COLUMN)Weather(COLUMN)High(COLUMN)Low Acapulco(COLUMN)pt.cldy(COLUMN)88(COLUMN)77 Barbados(COLUMN)pt. cldy(COLUMN)86(COLUMN)71 Bermuda(COLUMN)cloudy(COLUMN)76(COLUMN)71 Bogota(COLUMN)pt. cldy(COLUMN)65(COLUMN)50 Culiacan(COLUMN)clear(COLUMN)99(COLUMN)71 Edmonton(COLUMN)rain(COLUMN)63(COLUMN)46 Havana(COLUMN)fair(COLUMN)62(COLUMN)72 Kingston(COLUMN)pt. cldy(COLUMN)88(COLUMN)77 Montego Bay(COLUMN)pt. cldy(COLUMN)88(COLUMN)72 Mexico City(COLUMN)pt. cldy(COLUMN)77(COLUMN)57 Monterrey(COLUMN)pt. cldy(COLUMN)95(COLUMN)70 Montreal(COLUMN)pt. cldy(COLUMN)64(COLUMN)50 Nassau(COLUMN)fair(COLUMN)85(COLUMN)65 Ottawa(COLUMN)pt. cldy(COLUMN)59(COLUMN)50 Regina(COLUMN)pt. cldy(COLUMN)86(COLUMN)59 St.Kitts(COLUMN)pt. cldy(COLUMN)89(COLUMN)76 St. Thomas(COLUMN)pt. cldy(COLUMN)87(COLUMN)74 Toronto(COLUMN)cloudy(COLUMN)57(COLUMN)50 Vancouver(COLUMN)pt. cldy(COLUMN)59(COLUMN)46 Veracruz(COLUMN)haze(COLUMN)90(COLUMN)75 Winnipeg(COLUMN)clear(COLUMN)79(COLUMN)55(END TABLE)