Washington: Today - Partly cloudy, high near 70, low near 40. The chance of rain is near 10 percent through tonight. Winds will become southwesterly at 5 to 15 mph. Friday - Partly cloudy and cooler, high in the mid 50s.

Maryland and Virginia: Today - Partly cloudy, high in the 60s, low in the 30s. Friday - Partly cloudy and cooler, high in the 50s.Extended Area Forecast for Saturday through Monday - Cloudy with a chance of rain Sunday and Monday. Highs Saturday will be in the 50s, lows near 40s. Sunday and Monday will be warmer with highs in the 60s, and lows in the 40s to near 50.Normal Washington temperatures for the period are a high of 59 and a low of 38.

Lower Potomac and Chesapeake Bay - Fair weather will visbility of 5 miles or more through tonight. Winds will be southwesterly this afternoon at 10 to 15 knots shifting to the north at 10 to 20 knots. Waves will average 1 to 2 feet.

West Virginia: Today - Partly cloudy, highs will range from the mid 50s to mid 60s, lows from the mid 90s to mid 30s. Friday - Partly cloudy, high in the 50s.

The National Weather Forecast for today - Rain will extend from the middle Mississippi Valley through the central Plains, changing to snow over the central and northern Rocky Mountain region. Rain showers are likely over the central and northern Plateau region and the Pacific Northwest. A few thunderstorms are likely in the lower Mississippi Valley. Skies will be mostly sunny over the Atlantic Coast states, but clouds will be increasing over the Ohio and Tennessee Valleys.Temperatures will be mild over the eastern third of the nation and most of Texas. It will be cool in the Great Lakes area and throughout the Central and Western states.

Almanac Data for today: Sun rises 6:07 a.m., sets 6:23 p.m.; Moon rises 5:36 p.m. sets 5:27 a.m. Tides: high 7:06 a.m. and 7:29 p.m., low 1:34 a.m. and 1:58 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 3/4); Norfolk (1); Virginia Beach (3/4); Solomons Island (6 1/4); Point Lookout (7).

The Council of Governments' Air Quality Index for yesterday showed the high reading in the Washington area during the 3 p.m. period was 39 for the pollutant, photochemical oxidants. Index values between 25 and 49 inches fair 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 qualtiy will improve.

The National Weather Service forecast the Potomac River stage at Little Falls should fall to 6.2 feet today. Local Temp., Humidity(TABLE) Time(COLUMN)T.(COLUMN)H. 12 midnight(COLUMN)54(COLUMN)77 1 a.m.(COLUMN)51(COLUMN)77 2 a.m.(COLUMN)53(COLUMN)77 3 a.m.(COLUMN)50(COLUMN)52 4 a.m.(COLUMN)49(COLUMN)48 5 a.m.(COLUMN)47(COLUMN)49 6 a.m.(COLUMN)47(COLUMN)48 8 a.m.(COLUMN)49(COLUMN)42 9 a.m.(COLUMN)50(COLUMN)41 10 a.m.(COLUMN)52(COLUMN)39 11 a.m.(COLUMN)55(COLUMN)35 12 noon(COLUMN)58(COLUMN)33 1 p.m.(COLUMN)59(COLUMN)33 2 p.m.(COLUMN)61(COLUMN)31 3 p.m.(COLUMN)63(COLUMN)29 4 p.m.(COLUMN)65(COLUMN)27 5 p.m.(COLUMN)65(COLUMN)27 6 p.m.(COLUMN)59(COLUMN)35 7 p.m.(COLUMN)55(COLUMN)47(END TABLE) Temperatures ending 7 a.m. (EST) yesterday:(TABLE) City(COLUMN)H.(COLUMN)L. Albany(COLUMN)55(COLUMN)36 Albuquerque(COLUMN)74(COLUMN)46 Amarillo(COLUMN)75(COLUMN)49 Anchorage(COLUMN)40(COLUMN)31 Asheville(COLUMN)72(COLUMN)41 Atlanta(COLUMN)74(COLUMN)44 Atlantic City(COLUMN)53(COLUMN)44 Austin(COLUMN)85(COLUMN)61 Baltimore(COLUMN)79(COLUMN)41 Billings(COLUMN)61(COLUMN)32 Birmingham(COLUMN)69(COLUMN)46 Bismarck(COLUMN)51(COLUMN)31 Boise(COLUMN)60(COLUMN)45 Brownsville(COLUMN)85(COLUMN)68 Buffalo(COLUMN)55(COLUMN)33 Burlington, Vt.(COLUMN)54(COLUMN)36 Casper(COLUMN)64(COLUMN)31 Charleston, S.C.(COLUMN)73(COLUMN)58 Charleston, W.V.(COLUMN)75(COLUMN)37 Charlotte(COLUMN)75(COLUMN)45 Cheyenne(COLUMN)66(COLUMN)38 Chicago(COLUMN)46(COLUMN)34 Cincinnati(COLUMN)60(COLUMN)27 Cleveland(COLUMN)59(COLUMN)36 Columbia, S.C.(COLUMN)78(COLUMN)45 Columbus(COLUMN)58(COLUMN)30 Dal.-Ft. Worth(COLUMN)80(COLUMN)53 Dayton(COLUMN)57(COLUMN)31 Denver(COLUMN)72(COLUMN)40 Des Monies(COLUMN)55(COLUMN)42 Detroit(COLUMN)48(COLUMN)32 Duluth(COLUMN)43(COLUMN)36 El Paso(COLUMN)77(COLUMN)48 Fairbanks(COLUMN)23(COLUMN)06 Fargo(COLUMN)44(COLUMN)32 Flagstaff(COLUMN)60(COLUMN)32 Great Falls(COLUMN)58(COLUMN)31 Hartford(COLUMN)57(COLUMN)41 Helena(COLUMN)67(COLUMN)37 Honolulu(COLUMN)83(COLUMN)72 Houston(COLUMN)80(COLUMN)62 Indianapolis(COLUMN)61(COLUMN)31 Jackson(COLUMN)73(COLUMN)40 Jacksonville(COLUMN)79(COLUMN)55 Juneau(COLUMN)42(COLUMN)29 Kansas City(COLUMN)63(COLUMN)48 Las Vegas(COLUMN)77(COLUMN)54 Little Rock(COLUMN)71(COLUMN)49 Los Angeles(COLUMN)67(COLUMN)57 Louisville(COLUMN)63(COLUMN)32 Memphis(COLUMN)68(COLUMN)43 Miami Beach(COLUMN)75(COLUMN)67 Midland(COLUMN)85(COLUMN)65 Milwaukee(COLUMN)44(COLUMN)34 Mpls.-St. Paul(COLUMN)50(COLUMN)33 Nashville(COLUMN)62(COLUMN)33 New Orleans(COLUMN)80(COLUMN)53 New York(COLUMN)59(COLUMN)44 Norfolk(COLUMN)76(COLUMN)50 North Platte(COLUMN)72(COLUMN)36 Oklahoma City(COLUMN)74(COLUMN)50 Omaha(COLUMN)60(COLUMN)41 Orlando(COLUMN)84(COLUMN)60 Philadelphia(COLUMN)72(COLUMN)41 Phoenix(COLUMN)84(COLUMN)59 Pittsburgh(COLUMN)70(COLUMN)37 Portland, Me.(COLUMN)50(COLUMN)41 Portland, Or.(COLUMN)70(COLUMN)46 Providence(COLUMN)58(COLUMN)42 Raleigh(COLUMN)77(COLUMN)51 Rapid City(COLUMN)67(COLUMN)35 Reno(COLUMN)53(COLUMN)36 Richmond(COLUMN)78(COLUMN)47 St. Louis(COLUMN)56(COLUMN)37 St. Pete-Tampa(COLUMN)81(COLUMN)56 Salt Lake City(COLUMN)70(COLUMN)50 San Antonio(COLUMN)83(COLUMN)63 San Diego(COLUMN)70(COLUMN)64 San Francisco(COLUMN)62(COLUMN)56 San Juan(COLUMN)87(COLUMN)71 St. Ste. Marie(COLUMN)36(COLUMN)16 Seattle(COLUMN)62(COLUMN)47 Shreveport(COLUMN)78(COLUMN)48 Sioux Falls(COLUMN)58(COLUMN)36 Spokane(COLUMN)62(COLUMN)43 Syracuse(COLUMN)58(COLUMN)32 Topeka(COLUMN)69(COLUMN)44 Tuscon(COLUMN)80(COLUMN)62 Tulsa(COLUMN)71(COLUMN)48 Washington(COLUMN)79(COLUMN)46 Wichita(COLUMN)69(COLUMN)48 Temperatures Abroad Yesterday(END TABLE)(TABLE) City(COLUMN)Weather(COLUMN)Time(COLUMN)Temp. Aberdeen(COLUMN) cloudy(COLUMN) 1 p.m.(COLUMN)41 Amsterdam(COLUMN) cloudy(COLUMN) 1 p.m.(COLUMN)46 Ankara(COLUMN) cloudy(COLUMN) 3 p.m.(COLUMN)59 Athens(COLUMN) cloudy(COLUMN) 2 p.m.(COLUMN)55 Auckland(COLUMN) clear(COLUMN)midnight(COLUMN)57 Berlin(COLUMN) clear(COLUMN) 1 p.m.(COLUMN)36 Birmingham(COLUMN) rain(COLUMN) 1 p.m.(COLUMN)46 Brussels(COLUMN) cloudy(COLUMN) 1 p.m.(COLUMN)45 Casablanca(COLUMN) clear(COLUMN) noon(COLUMN)63 Copenha'n(COLUMN)pt. cldy(COLUMN) 1 p.m.(COLUMN)30 Dublin(COLUMN) rain(COLUMN) 1 p.m.(COLUMN)52 Geneva(COLUMN)pt. cldy(COLUMN) 1 p.m.(COLUMN)41 Hong Kong(COLUMN) cloudy(COLUMN) 8 p.m.(COLUMN)55 Lisbon(COLUMN)pt. cldy(COLUMN) noon(COLUMN)61 London(COLUMN) cloudy(COLUMN) 1 p.m.(COLUMN)46 Madrid(COLUMN)pt. cldy(COLUMN) 1 p.m.(COLUMN)61 Malta(COLUMN)pt. cldy(COLUMN) 1 p.m.(COLUMN)55 Manila(COLUMN) clear(COLUMN) 8 p.m.(COLUMN)84 Moscow(COLUMN) cloudy(COLUMN) 3 p.m.(COLUMN)36 New Delhi(COLUMN) clear(COLUMN) 5 p.m.(COLUMN)81 Nice(COLUMN) clear(COLUMN) 1 p.m.(COLUMN)57 Oslo(COLUMN)pt. cldy(COLUMN) 1 p.m.(COLUMN)21 Paris(COLUMN) rain(COLUMN) 1 p.m.(COLUMN)45 Peking(COLUMN) clear(COLUMN) 8 p.m.(COLUMN)45 Rome(COLUMN) clear(COLUMN) 1 p.m.(COLUMN)59 Saigon(COLUMN)pt. cldy(COLUMN) 8 p.m.(COLUMN)86 Sofia(COLUMN) rain(COLUMN) 2 p.m.(COLUMN)34 Stockholm(COLUMN) clear(COLUMN) 1 p.m.(COLUMN)19 Sydney(COLUMN)pt. cldy(COLUMN)10 p.m.(COLUMN)73 Tel Aviv(COLUMN) clear(COLUMN) 2 p.m.(COLUMN)68 Tokyo(COLUMN) rain(COLUMN) 9 p.m.(COLUMN)43 Tunis(COLUMN)pt. cldy(COLUMN) 1 p.m.(COLUMN)57 Vienna(COLUMN) cloudy(COLUMN) 1 p.m.(COLUMN)41 Warsaw(COLUMN) cloudy(COLUMN) 1 p.m.(COLUMN)30(END TABLE) Temperatures (Western Hemisphere)(TABLE) City(COLUMN)Weather(COLUMN)High(COLUMN)Low Acapulco(COLUMN) clear(COLUMN)88(COLUMN)78 Barbados(COLUMN)pt. cldy(COLUMN)85(COLUMN)78 Bermuda(COLUMN) cloudy(COLUMN)77(COLUMN)66 Bogota(COLUMN)pt. cldy(COLUMN)70(COLUMN)45 Calgary(COLUMN) cloudy(COLUMN)45(COLUMN)30 Cullacan(COLUMN)pt. cldy(COLUMN)82(COLUMN)62 Edmonton(COLUMN) cloudy(COLUMN)43(COLUMN)28 Havana(COLUMN)pt. cldy(COLUMN)82(COLUMN)66 Kingston(COLUMN) sunny(COLUMN)86(COLUMN)70 Montego Bay(COLUMN)pt. cldy(COLUMN)85(COLUMN)72 Mexico City(COLUMN) haze(COLUMN)79(COLUMN)59 Monterrey(COLUMN) cloudy(COLUMN)90(COLUMN)65 Montreal(COLUMN) snow(COLUMN)32(COLUMN)28 Nassau(COLUMN) rain(COLUMN)79(COLUMN)68 Ottawa(COLUMN) snow(COLUMN)32(COLUMN)27 Regina(COLUMN) clear(COLUMN)41(COLUMN)21 St. Kitts(COLUMN)pt. cldy(COLUMN)86(COLUMN)73 St. Thomas(COLUMN) sunny(COLUMN)86(COLUMN)73 Toronto(COLUMN) cloudy(COLUMN)41(COLUMN)30 Vancouver(COLUMN)pt. cldy(COLUMN)54(COLUMN)41 Veracruz(COLUMN) cloudy(COLUMN)82(COLUMN)66 Winnipeg(COLUMN) clear(COLUMN)43(COLUMN)28(END TABLE)