Washington: Today -- Partly cloudy, windy and cold, high near 40, low near 20. The chance of precipitation is near zero through tonight. Winds will shift to the northwest at 15 to 20 mph. Friday -- Increasing cloudiness and continued cold, high in the 30s.

Maryland and Virginia: Today -- Partly cloudy, windy and cold, highs in the 30s and 40s, lows in the teens and 20s. Friday -- Increasing cloudiness and continued cold, highs mostly in the 30s.

West Virginia: Today -- Partly cloudy, highs from the mid 20s to the 30s, lows mostly in the teens. Friday -- Mostly cloudy with a chance of rain, highs from the mid 30s to the 40s.

Extended Area Forecast for Saturday through Monday -- Chance of snow Saturday, becoming mixed with or changing to rain. Fair Sunday and Monday. Highs will range from the mid 30s to near 50, lows from the teens to the 30s. Normal Washington area temperatures are a high of 44 and a low of 28.

Lower Potomac and Chesapeake Bay -- Fair with visibility of 5 miles or more. Winds will be from the northwest at 15 to 30 knots becoming gusty. Waves will average 1 to 2 feet.

The Nation Yesterday: A frontal system centered near Lake Huron pushed heavy snow the northeastern corner of the nation. Snowshowers were scattered from Pennsylvania and New York into Maine.A new storm was brewing in the Southwest. Cloudy skies spread from the Pacific across the southern Rockies bringing rain over southern California and Arizona while heavy snowshowers were scattered across the mountains. The Pacific Northwest through the upper Great Lakes region had fair skies and cold temperatures. North Dakota and northern Minnesota were still below zero. The Gulf Coast states were mild with high temperatures in the 60s and the middle 70s. Showers and fog continued from eastern Texas through the Mississippi Delta region. Florida and southern Texas were pleasant, with mostly sunny skies and temperatures near 80.

The National Weather Forecast for today -- Snowshowers will continue through New York and New England. Rain will spread across the deserts of the Southwest, through Texas and the southern Plains, into the Mississippi Delta. Snow will be heavy at times over the Rockies with freezing rain and snow spreading into the central Plains. The Pacific Coast states will be partly cloudy with fog along the Pacific Northwest. Coast. The northern Plains and the Great Lakes region will be sunny with partly cloudy skies spreading into the Middle Atlantic states and Florida. Freezing weather will continue over the northern half of the nation. The Gulf Coast states will be mild. Florida and southern Texas will peak near 80.

Almanac Data for today: The sun rises 5:10 a.m., sets 7:25 p.m.; the moon rises 9:28 p.m., sets 9:39 a.m. Tides: high 10:57 a.m. and 11:14 p.m., low 5:44 a.m. and 6:03 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 1/2), 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 25 for the pollutant, sulfur dioxide. Index values between 25 and 49 indicate 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 quality will improve.

The National Weather Service forecasts the Potomac River stage at Little Falls should remain near 4.0 feet today.

Washington data for yesterday: Highest temperature since midnight yesterday, 43 degrees at 5:10 p.m. Lowest temperature since midnight, 32 degrees at 6:10 a.m. Deficiency of temperature since Jan. 1, 20 degrees. Record high temperature for today, 67 degrees in 1929. Record low temperature for today, -6 degrees in 1983. Relative humidity: maximum, 73 percent at 1 p.m.; minimum, 52 percent at 1 p.m. 24 hour precipitation,.03 inches. Excess of preciptation since Jan. 1, 2.17 inches. Highest observed wind since 7 a.m., 15 miles per hour from the south southwest at 2:53 p.m. Peak gust since 7 a.m., 22 miles per hour from the south at 3:07 p.m. Local Temp., Humidity (TABLE) Time(COLUMN)T.(COLUMN)H. 12 mid.(COLUMN)36(COLUMN)54 1 a.m.(COLUMN)35(COLUMN)52 2 a.m.(COLUMN)35(COLUMN)52 3 a.m.(COLUMN)34(COLUMN)56 4 a.m.(COLUMN)33(COLUMN)56 5 a.m.(COLUMN)33(COLUMN)56 6 a.m.(COLUMN)33(COLUMN)54 7 a.m.(COLUMN)32(COLUMN)56 8 a.m.(COLUMN)33(COLUMN)56 9 a.m.(COLUMN)33(COLUMN)59 10 a.m.(COLUMN)34(COLUMN)56 11 a.m.(COLUMN)33(COLUMN)66 12 noon(COLUMN)34(COLUMN)72 1 p.m.(COLUMN)35(COLUMN)73 2 p.m.(COLUMN)37(COLUMN)73 3 p.m.(COLUMN)39(COLUMN)70 4 p.m.(COLUMN)42(COLUMN)65 5 p.m.(COLUMN)42(COLUMN)65 6 p.m.(COLUMN)42(COLUMN)65 7 p.m.(COLUMN)42(COLUMN)62 8 p.m.(COLUMN)37(COLUMN)76 9 p.m.(COLUMN)36(COLUMN)79 10 p.m.(COLUMN)36(COLUMN)79 11 p.m.(COLUMN)34(COLUMN)85(END TABLE) Temperatures ending 7 p.m. (EST) yesterday: (TABLE) City(COLUMN)L.(COLUMN)H. Albany(COLUMN)-01(COLUMN)21 Albuquerque(COLUMN)35(COLUMN)53 Amarillo(COLUMN)32(COLUMN)56 Anchorage(COLUMN)26(COLUMN)34 Asheville(COLUMN)32(COLUMN)63 Atlanta(COLUMN)33(COLUMN)63 Atlantic City(COLUMN)27(COLUMN)42 Austin(COLUMN)56(COLUMN)63 Baltimore(COLUMN)27(COLUMN)38 Billings(COLUMN)10(COLUMN)25 Birmingham(COLUMN)47(COLUMN)61 Bismarck(COLUMN)17(COLUMN)25 Boise(COLUMN)11(COLUMN)29 Boston(COLUMN)14(COLUMN)29 Brownsville(COLUMN)65(COLUMN)79 Buffalo(COLUMN)06(COLUMN)33 Burlington, Vt.(COLUMN)-08(COLUMN)09 Casper(COLUMN)11(COLUMN)34 Charleston, S.C.(COLUMN)50(COLUMN)62 Charleston, W.V.(COLUMN)29(COLUMN)51 Charlotte(COLUMN)31(COLUMN)65 Cheyenne(COLUMN)20(COLUMN)40 Chicago(COLUMN)12(COLUMN)33 Clincinnati(COLUMN)34(COLUMN)43 Cleveland(COLUMN)22(COLUMN)37 Columbia, S.C.(COLUMN)29(COLUMN)68 Columbus(COLUMN)26(COLUMN)39 Dal.-Ft. Worth(COLUMN)50(COLUMN)68 Dayton(COLUMN)24(COLUMN)38 Denver(COLUMN)19(COLUMN)38 Des Moines(COLUMN)08(COLUMN)23 Detroit(COLUMN)15(COLUMN)34 Duluth(COLUMN)-03(COLUMN)10 El Paso(COLUMN)35(COLUMN)55 Evansville(COLUMN)35(COLUMN)43 Fairbanks(COLUMN)08(COLUMN)17 Fargo(COLUMN)-16(COLUMN)00 Flagstaff(COLUMN)32(COLUMN)33 Great Falls(COLUMN)17(COLUMN)29 Hartford(COLUMN)10(COLUMN)21 Helena(COLUMN)-07(COLUMN)14 Honolulu(COLUMN)65(COLUMN)78 Houston(COLUMN)64(COLUMN)70 Indianapolis(COLUMN)29(COLUMN)39 Jackson(COLUMN)49(COLUMN)67 Jacksonville(COLUMN)43(COLUMN)68 Juneau(COLUMN)33(COLUMN)37 Kansas City(COLUMN)12(COLUMN)31 Las Vegas(COLUMN)40(COLUMN)52 Little Rock(COLUMN)40(COLUMN)53 Los Angeles(COLUMN)50(COLUMN)63 Louisville(COLUMN)37(COLUMN)46 Memphis(COLUMN)48(COLUMN)54 Miami Beach(COLUMN)71(COLUMN)74 Midland(COLUMN)33(COLUMN)63 Milwaukee(COLUMN)12(COLUMN)23 Mpls.-St. Paul(COLUMN)03(COLUMN)10 Nashville(COLUMN)42(COLUMN)49 New Orleans(COLUMN)49(COLUMN)72 New York(COLUMN)25(COLUMN)37 Norfolk(COLUMN)26(COLUMN)51 North Platte(COLUMN)-03(COLUMN)28 Oklahoma City(COLUMN)29(COLUMN)43 Omaha(COLUMN)02(COLUMN)28 Oriando(COLUMN)51(COLUMN)79 Philadelphia(COLUMN)24(COLUMN)35 Phoenix(COLUMN)53(COLUMN)63 Pittsburgh(COLUMN)17(COLUMN)38 Portland, Me.(COLUMN)-07(COLUMN)16 Portland, Ore.(COLUMN)29(COLUMN)38 Providence(COLUMN)13(COLUMN)24 Raleigh(COLUMN)28(COLUMN)66 Rapid City(COLUMN)01(COLUMN)24 Reno(COLUMN)34(COLUMN)43 Richmond(COLUMN)30(COLUMN)56 St. Louis(COLUMN)29(COLUMN)38 St. Prbg.-Tampa(COLUMN)52(COLUMN)75 Salt Lake City(COLUMN)23(COLUMN)34 San Antonio(COLUMN)55(COLUMN)68 San Diego(COLUMN)56(COLUMN)63 San Francisco(COLUMN)46(COLUMN)54 San Juan(COLUMN)75(COLUMN)83 St. Ste. Marie(COLUMN)04(COLUMN)14 Seattle(COLUMN)34(COLUMN)50 Shreveport(COLUMN)54(COLUMN)69 Sioux Falls(COLUMN)-06(COLUMN)23 Spokane(COLUMN)20(COLUMN)25 Syracuse(COLUMN)10(COLUMN)32 Topeka(COLUMN)08(COLUMN)27 Tucson(COLUMN)52(COLUMN)60 Tulsa(COLUMN)30(COLUMN)41 Washington(COLUMN)32(COLUMN)43 Wichita(COLUMN)12(COLUMN)32(END TABLE) Temperatures Abroad Yesterday (TABLE) City(COLUMN)Weather(COLUMN)Time(COLUMN)Temp. Aberdeen(COLUMN)clear(COLUMN)1 p.m.(COLUMN)36 Amsterdam(COLUMN)cloudy(COLUMN)1 p.m.(COLUMN)25 Ankara(COLUMN)pt. cldy.(COLUMN)3 p.m.(COLUMN)41 Athens(COLUMN)pt. cldy.(COLUMN)2 p.m.(COLUMN)46 Auckland(COLUMN)clear(COLUMN)midnight(COLUMN)64 Berlin(COLUMN)cloudy(COLUMN)1 p.m.(COLUMN)30 Birmingham(COLUMN)rain(COLUMN)1 p.m.(COLUMN)36 Bonn(COLUMN)cloudy(COLUMN)1 p.m.(COLUMN)23 Brussels(COLUMN)cloudy(COLUMN)1 p.m.(COLUMN)27 Cairo(COLUMN)clear(COLUMN)2 p.m.(COLUMN)64 Casablanca(COLUMN)rain(COLUMN)noon(COLUMN)63 Copenhagen(COLUMN)snow(COLUMN)1 p.m.(COLUMN)28 Dublin(COLUMN)clear(COLUMN)1 p.m.(COLUMN)37 Geneva(COLUMN)pt. cldy.(COLUMN)1 p.m.(COLUMN)25 Hong Kong(COLUMN)cloudy(COLUMN)8 p.m.(COLUMN)64 Jerusalem(COLUMN)clear(COLUMN)2 p.m.(COLUMN)55 Lisbon(COLUMN)cloudy(COLUMN)noon(COLUMN)52 London(COLUMN)rain(COLUMN)1 p.m.(COLUMN)36 Madrid(COLUMN)pt. cldy.(COLUMN)1 p.m.(COLUMN)48 Malta(COLUMN)pt. cldy.(COLUMN)1 p.m.(COLUMN)45 Manila(COLUMN)clear(COLUMN)8 p.m.(COLUMN)79 Moscow(COLUMN)clear(COLUMN)3 p.m.(COLUMN)12 New Delhi(COLUMN)pt. cldy.(COLUMN)5 p.m.(COLUMN)63 Nice(COLUMN)cloudy(COLUMN)1 p.m.(COLUMN)37 Oslo(COLUMN)cloudy(COLUMN)1 p.m.(COLUMN)25 Paris(COLUMN)cloudy(COLUMN)1 p.m.(COLUMN)23 Peking(COLUMN)clear(COLUMN)8 p.m.(COLUMN)27 Rome(COLUMN)pt. cldy.(COLUMN)1 p.m.(COLUMN)43 Saigon(COLUMN)clear(COLUMN)8 p.m.(COLUMN)82 Sofia(COLUMN)cloudy(COLUMN)2 p.m.(COLUMN)28 Stockholm(COLUMN)snow(COLUMN)1 p.m.(COLUMN)27 Sydney(COLUMN)cloudy(COLUMN)10 p.m.(COLUMN)70 Tokyo(COLUMN)pt. cldy.(COLUMN)9 p.m.(COLUMN)48 Tunis(COLUMN)pt. cldy.(COLUMN)1 p.m.(COLUMN)50 Vienna(COLUMN)cloudy(COLUMN)1 p.m.(COLUMN)27 Warsaw(COLUMN)snow(COLUMN)1 p.m.(COLUMN)25(END TABLE) Temperatures (Western Hemisphere) (TABLE) City(COLUMN)Weather(COLUMN)High(COLUMN)Low Acapulco(COLUMN)fair(COLUMN)90(COLUMN)66 Barbados(COLUMN)pt. cldy.(COLUMN)82(COLUMN)72 Bermuda(COLUMN)pt. cldy.(COLUMN)66(COLUMN)62 Bogota(COLUMN)sunny(COLUMN)68(COLUMN)32 Havana(COLUMN)pt. cldy.(COLUMN)79(COLUMN)68 Kingston(COLUMN)fair(COLUMN)86(COLUMN)72 Montego Bay(COLUMN)fair(COLUMN)81(COLUMN)75 Mexico City(COLUMN)fair(COLUMN)73(COLUMN)37 Monterrey(COLUMN)pt. cldy.(COLUMN)66(COLUMN)50 Nassau(COLUMN)fair(COLUMN)77(COLUMN)70 St. Kitts(COLUMN)fair(COLUMN)83(COLUMN)70 Veracruz(COLUMN)fog(COLUMN)75(COLUMN)64(END TABLE)