Washington: Today -- Becoming cloudy, with a slight chance of snow tonight, high 30 to 35, low 18 to 23. Winds will be light and variable today and tonight. Saturday -- Chance of snow, high 30 to 35.

Maryland and Virginia: Today -- Becoming cloudy with a chance of snow, highs from the low 20s to the mid 30s, lows from the teens to near 20. Saturday -- Chance of snow, highs from the high 20s to the mid 30s.

Extended Area Forecast for Sunday through Tuesday -- Mostly cloudy and warmer, with a chance of precipitation each day, highs from the low 30s to the low 40s, lows from the low 20s to the mid 30s.

Lower Potomac and Chesapeake Bay -- Becoming cloudy, with a chance of snow tonight. Visibility will become poor by tonight. Winds will be easterly at 8 knots or less. Waves in unprotected waters will be 1 foot or less.

West Virginia: Today -- Increasing cloudiness with a good chance of snow, highs from the 20s to near 30, lows from 15 to 20. Saturday -- Snow likely, highs from the mid 2/s to the low 30s.

The National Weather Forecast for today: Rain will extend across California and Arizona, with snow or rain in Utah and Nevada. Light snow will fall from the northern Rockles across the central Great Plains, the Mississippi Valley, the eastern Great Lakes to the Appalachians. Louisiana and the southern half of Taxas will have rain. Rain or snow with some freezing rain and drizzle will be over Arkansas and northern Texas. Except for sunny skies in southern New England and northeast New York, cloudy or partly skies will prevail. Very cold weather will reach from most of the Rockies and the Great Plains across the Great Lakes, the Ohio Valley, and the central Appalachians. The rest of the nation will be cold.

The Council of Government's Air Quality Index for yesterday showed the high reading in the Washington area during the 3 p.m. period was 16 for the pollutant, photochemical oxidants. Index values between 0-24 indicate ood air quality. When the index exceeds 100 the air is considered very unhealthy and individual with lung, heart and eye ailments are urged to restrict their activity. The forcast for today indicates that the air quality will continue to be good.

The National Weather Service forecasts the Potomas River stage at Little Falls should drop to 5.8 feet today.

Washington data for yesterday: Highest temperature since midnight yesterday, 36 degrees at 3:40 p.m. Lowest temperature since midnight, 15 degrees at 5:40 a.m. Excess of temperature since Jan. 1, 4 degrees. Record high temperature for today, 69 degrees in 1950. Record low temperature for toady, -- 03 degrees in 1877. Relative humidity: maximum, 74 percent at 8:00 a.m.; minimum, 35 percent at 4:00 p.m. 24 hour precipitation, none. Excess of precipitation since Jan. 1, 1.34 inches. Highest observed wind since 7 a.m., 20 miles per hour from the southwest at 2:53 p.m. Peak gust since 7 a.m., 32 miles per hour from the southwest at 2:03 p.m.

Local Temp., Humidity (TABLE) Time(COLUMN)T.(COLUMN)H. 12 Mid.(COLUMN)16(COLUMN)54 1 a.m.(COLUMN)18(COLUMN)54 2 a.m.(COLUMN)18(COLUMN)54 3 a.m.(COLUMN)18(COLUMN)51 4 a.m.(COLUMN)18(COLUMN)51 5 a.m.(COLUMN)16(COLUMN)56 6 a.m.(COLUMN)16(COLUMN)64 7 a.m.(COLUMN)17(COLUMN)67 8 a.m.(COLUMN)17(COLUMN)74 9 a.m.(COLUMN)20(COLUMN)57 10 a.m.(COLUMN)24(COLUMN)48 11 a.m.(COLUMN)26(COLUMN)48 12 Noon(COLUMN)31(COLUMN)39 1 p.m.(COLUMN)33(COLUMN)38 2 p.m.(COLUMN)35(COLUMN)35 3 p.m.(COLUMN)35(COLUMN)35 4 p.m.(COLUMN)36(COLUMN)35 5 p.m.(COLUMN)34(COLUMN)40 6 p.m.(COLUMN)32(COLUMN)45 7 p.m.(COLUMN)31(COLUMN)47 8 p.m.(COLUMN)32(COLUMN)41 9 p.m.(COLUMN)31(COLUMN)41 10 p.m.(COLUMN)30(COLUMN)41 11 p.m.(COLUMN)27(COLUMN)48(END TABLE)

Temperatures ending 7 p.m. (EST) yesterday: (TABLE) City(COLUMN)L.(COLUMN)H. Albany(COLUMN)5(COLUMN)22 Albuqerque(COLUMN)23(COLUMN)51 Amarillo(COLUMN)14(COLUMN)24 Anchorage(COLUMN)4(COLUMN)19 Ashevile(COLUMN)12(COLUMN)39 Atlanta(COLUMN)15(COLUMN)41 Atlantic City(COLUMN)14(COLUMN)27 Austin(COLUMN)35(COLUMN)48 Baltimore(COLUMN)8(COLUMN)34 Billings(COLUMN)-8(COLUMN)5 Birmingham(COLUMN)20(COLUMN)42 Bismarck(COLUMN)-16(COLUMN)-9 Boise(COLUMN)6(COLUMN)22 Boston(COLUMN)16(COLUMN)27 Brownsville(COLUMN)56(COLUMN)69 Buffalo(COLUMN)7(COLUMN)14 Burlington(COLUMN)7(COLUMN)15 Casper(COLUMN)-5(COLUMN)4 Charleston, S.C.(COLUMN)30(COLUMN)42 Ch'leston, W.Va.(COLUMN)14(COLUMN)29 Charlotte(COLUMN)13(COLUMN)39 Cheyenne(COLUMN)-1(COLUMN)8 Chicago(COLUMN)-5(COLUMN)4 Cincinnati(COLUMN)12(COLUMN)22 Cleveland(COLUMN)9(COLUMN)17 Columbia(COLUMN)17(COLUMN)46 Columbus(COLUMN)12(COLUMN)18 Dal.-Ft. Worth(COLUMN)29(COLUMN)34 Dayton(COLUMN)12(COLUMN)19 Denver(COLUMN)7(COLUMN)15 Des Moines(COLUMN)-6(COLUMN)5 Detroit(COLUMN)5(COLUMN)15 Duluth(COLUMN)-20(COLUMN)-7 El Paso(COLUMN)28(COLUMN)60 Fairbanks(COLUMN)-24(COLUMN)-15 Fargo(COLUMN)-18(COLUMN)-10 Flagstaff(COLUMN)18(COLUMN)47 Great Falls(COLUMN)-15(COLUMN)-2 Hartford(COLUMN)10(COLUMN)22 Helena(COLUMN)-5(COLUMN)6 Houston(COLUMN)39(COLUMN)54 Indianapolis(COLUMN)8(COLUMN)16 Jackson, Miss.(COLUMN)23(COLUMN)48 Jacksonville(COLUMN)23(COLUMN)47 Juneau(COLUMN)1(COLUMN)15 Kansas City(COLUMN)4(COLUMN)9 Las Vegas(COLUMN)29(COLUMN)55 Little Rock(COLUMN)24(COLUMN)38 Los Angeles(COLUMN)45(COLUMN)67 Louisville(COLUMN)17(COLUMN)29 Memphis(COLUMN)23(COLUMN)40 Miami Beach(COLUMN)45(COLUMN)69 Midland-Odessa(COLUMN)28(COLUMN)49 Milwaukee(COLUMN)-5(COLUMN)0 Mpls.-St. Paul(COLUMN)-10(COLUMN)-1 Nashville(COLUMN)15(COLUMN)39 New Orleans(COLUMN)31(COLUMN)47 New York(COLUMN)14(COLUMN)28 Norfolk(COLUMN)14(COLUMN)36 North Platte(COLUMN)2(COLUMN)4 Oklahoma City(COLUMN)18(COLUMN)29 Omaha(COLUMN)-2(COLUMN)4 Orlando(COLUMN)34(COLUMN)64 Philadelphia(COLUMN)11(COLUMN)30 Phoenix(COLUMN)37(COLUMN)70 Pittsburgh(COLUMN)10(COLUMN)19 Portland, Maine(COLUMN)9(COLUMN)24 Portland, Ore.(COLUMN)27(COLUMN)31 Providence(COLUMN)9(COLUMN)22 Raleigh(COLUMN)9(COLUMN)42 Rapid City(COLUMN)-5(COLUMN)2 Reno(COLUMN)19(COLUMN)40 Richmond(COLUMN)11(COLUMN)36 St. Louis(COLUMN)12(COLUMN)15 St. Pbg.-Tampa(COLUMN)32(COLUMN)62 Salt Lake City(COLUMN)20(COLUMN)29 San Antonio(COLUMN)39(COLUMN)49 San Diego(COLUMN)48(COLUMN)67 San Francisco(COLUMN)49(COLUMN)55 San Juan(COLUMN)75(COLUMN)80 St. Ste. Marie(COLUMN)6(COLUMN)8 Seattle(COLUMN)31(COLUMN)41 Shreveport(COLUMN)27(COLUMN)41 Sioux Falls(COLUMN)-14(COLUMN)-3 Spokane(COLUMN)-1(COLUMN)17 Syracuse(COLUMN)8(COLUMN)20 Topeka(COLUMN)-1(COLUMN)11 Tucson(COLUMN)38(COLUMN)72 Tulsa(COLUMN)19(COLUMN)32 Washington(COLUMN)15(COLUMN)36 Wichita(COLUMN)12(COLUMN)17(END TABLE)

Temperatures Abroad Yesterday (TABLE) City(COLUMN)Weather(COLUMN)Time(COLUMN)Temp. Aberdeen(COLUMN)cloudy(COLUMN)1 p.m.(COLUMN)30 Amsterdam(COLUMN)cloudy(COLUMN)1 p.m.(COLUMN)18 Ankara(COLUMN)pt. cldy(COLUMN)3 p.m.(COLUMN)23 Athens(COLUMN)clear(COLUMN)2 p.m.(COLUMN)43 Auckland(COLUMN)clear(COLUMN)12 a.m.(COLUMN)61 Berlin(COLUMN)clear(COLUMN)1 p.m.(COLUMN)18 Birmingham(COLUMN)cloudy(COLUMN)1 p.m.(COLUMN)32 Bonn(COLUMN)pt. cldy(COLUMN)1 p.m.(COLUMN)18 Brussels(COLUMN)pt. cldy(COLUMN)1 p.m.(COLUMN)27 Cassablanca(COLUMN)cloudy(COLUMN)12 p.m.(COLUMN)63 Copenhagen(COLUMN)clear(COLUMN)1 p.m.(COLUMN)19 Dublin(COLUMN)cloudy(COLUMN)1 p.m.(COLUMN)37 Geneva(COLUMN)snow(COLUMN)1 p.m.(COLUMN)23 Hong Kong(COLUMN)clear(COLUMN)8 p.m.(COLUMN)66 Jerusalem(COLUMN)rain(COLUMN)2 p.m.(COLUMN)43 Lisbon(COLUMN)cloudy(COLUMN)12 p.m.(COLUMN)54 London(COLUMN)cloudy(COLUMN)1 p.m.(COLUMN)34 Madrid(COLUMN)cloudy(COLUMN)1 p.m.(COLUMN)46 Malta(COLUMN)cloudy(COLUMN)1 p.m.(COLUMN)55 Manila(COLUMN)pt. cldy(COLUMN)8 p.m.(COLUMN)77 Moscow(COLUMN)snow(COLUMN)3 p.m.(COLUMN)03 New Delhi(COLUMN)clear(COLUMN)5 p.m.(COLUMN)68 Nice(COLUMN)rain(COLUMN)1 p.m.(COLUMN)39 Oslo(COLUMN)clear(COLUMN)1 p.m.(COLUMN)07 Paris(COLUMN)cloudy(COLUMN)1 p.m.(COLUMN)28 Peking(COLUMN)clear(COLUMN)8 p.m.(COLUMN)28 Rome(COLUMN)rain(COLUMN)1 p.m.(COLUMN)41 Saigon(COLUMN)pt. cldy(COLUMN)8 p.m.(COLUMN)82 Stockholm(COLUMN)snow(COLUMN)1 p.m.(COLUMN)16 Sydney(COLUMN)clear(COLUMN)10 p.m.(COLUMN)72 Tokyo(COLUMN)clear(COLUMN)9 p.m.(COLUMN)45 Tunis(COLUMN)pt. cldy(COLUMN)1 p.m.(COLUMN)61 Vienna(COLUMN)cloudy(COLUMN)1 p.m.(COLUMN)25 Warsaw(COLUMN)Clear(COLUMN)1 p.m.(COLUMN)-06(END TABLE)

Temperatures (Western Hemisphere) (TABLE) Cilty(COLUMN)Weather(COLUMN)High(COLUMN)Low Acapulco(COLUMN)clear(COLUMN)93(COLUMN)66 Barbados(COLUMN)pt. cldy.(COLUMN)85(COLUMN)70 Bermuda(COLUMN)cloudy(COLUMN)72(COLUMN)63 Bagota(COLUMN)pt. cldy.(COLUMN)67(COLUMN)46 Culiacan(COLUMN)pt. cldy.(COLUMN)84(COLUMN)73 Havana(COLUMN)rain(COLUMN)68(COLUMN)61 Kingston(COLUMN)fair(COLUMN)88(COLUMN)72 Montego Bay(COLUMN)fair(COLUMN)84(COLUMN)63 Mexico City(COLUMN)clear(COLUMN)70(COLUMN)32 Monterrey(COLUMN)clear(COLUMN)51(COLUMN)39 Nassau(COLUMN)cloudy(COLUMN)77(COLUMN)64 St. Kitts(COLUMN)fair(COLUMN)81(COLUMN)70 Vera Cruz(COLUMN)cloudy(COLUMN)68(COLUMN)59(END TABLE)