Washington: Today -- increasing cloudiness and cold with snow likely tonight, high near 40, low in the 20s. The chance of precipitation is near zero today increasing to 60 per cent tonight. Winds will be out of the northwest at 10 to 20 miles per hour. Friday -- Snow changing to rain, high near 40.

Maryland and Virginia: Today --Increasing cloudiness and cold with snow likely, high in the 30s, low in the teens to mid 20s. Friday -- Snow changing to rain, high in the 30s.

Lower Potomac and Chesapeake Bay -- Fair with northerly winds at 12 to 20 knots diminishing to 5 to 10 knots by evening. Waves in ice free waters will average to 2 to 3 feet. Visibility will be 5 miles or more.

Extended Area Forecast for Saturday through Monday -- Rain, possibly changing to snow, ending Saturday otherwise clear and cold through the period. Highs will average from the mid 30s to the mid 40s, lows in the 20s. Normal Washington temperatures for the period are a high of 51 and a low of 32.

West Virginia: Today -- Sunny, highs from the mid 30s to near 40 lows in the 20s. Snow beginning tonight changing to rain by Friday, highs from the upper 30s to the mid 40s.

Almanac Data for today: Sun rises 6:40 a.m. sets 6:02 p.m. Moon rises 1:54 a.m., sets 11:28 p.m. Tides: high 1:00 a.m. and 1:32 p.m., low 7:48 a.m. and 8:44 p.m. high and low tides at the following locations may be obtained by subtracting the hours indicated from the hours above: Annapolis (1 1/2); Bloody Point Lighthouse (4 1/2); Deale, Md., (4 1/2); Colonial Beach (6); Norfold (1 1/2); Virginia Beach (1); Solomons Island (6 1/2); Point Lookout (7).

The Council of Governments' Air Quality Index for yesterday showed the high reading in the Washington area durin the 3 p.m. period was 19 for the pollutant, carbon monoxide. Index values between 0 and 24 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 remain about the same.

The National Weather Service forecasts the Potomac River stage at Little Falls should remain near 3.8 feet today.

Washington data at 7 p.m. (EST) yesterday: Highest temperature since 7 a.m. yesterday, 39 degrees at 3:30 p.m. Lowest temperature since midnight, 31 degrees at 8:45 a.m. Deficiency of temperature since Mar. 1, 5 degrees. Deficiency of temperature since Jan. 1, 252 degrees. Record high temperature for today, 77 degrees in 1972. Record low temperature for today, 13 degrees in 1925. Relative humidity: Maximum, 76 per cent at 5 p.m.; Minimum, 59 per cent at 6 p.m. 24-hour precipitation, 08 inches. Deficiency of precipitation since Mar. 1, .02 inches. Excess of precipitation since Jan. 1, 2.44 inches. Highest observed wind since 7 a.m. 17 miles per hour from the northwest at 4:21 p.m. Peak gust since 7 a.m., 21 miles per hour from the northwest at 4:14 p.m.

Local Temp., Humidity (TABLE) Time(COLUMN)T.(COLUMN)H. 12 mid.(COLUMN)32(COLUMN)78 1 a.m.(COLUMN)32(COLUMN)78 2 a.m.(COLUMN)32(COLUMN)78 3 a.m.(COLUMN)32(COLUMN)82 4 a.m.(COLUMN)32(COLUMN)82 5 a.m.(COLUMN)32(COLUMN)82 6 a.m.(COLUMN)32(COLUMN)82 7 a.m.(COLUMN)32(COLUMN)82 8 a.m.(COLUMN)32(COLUMN)82 9 a.m.(COLUMN)31(COLUMN)78 10 a.m.(COLUMN)32(COLUMN)75 11 a.m.(COLUMN)32(COLUMN)72 12 noon(COLUMN)33(COLUMN)69 1 p.m.(COLUMN)35(COLUMN)64 2 p.m.(COLUMN)36(COLUMN)62 3 p.m.(COLUMN)36(COLUMN)64 4 p.m.(COLUMN)37(COLUMN)62 5 p.m.(COLUMN)35(COLUMN)76 6 p.m.(COLUMN)35(COLUMN)59 7 p.m.(COLUMN)34(COLUMN)50(END TABLE)

Temperatures ending 7 a.m. (EST) yesterday: (TABLE) City(COLUMN)H.(COLUMN)L. Albany(COLUMN)31(COLUMN)12 Albuquerque(COLUMN)51(COLUMN)44 Amarillo(COLUMN)42(COLUMN)28 Anchorage(COLUMN)37(COLUMN)16 Asheville(COLUMN)40(COLUMN)34 Atlanta(COLUMN)46(COLUMN)38 Atlantic City(COLUMN)32(COLUMN)20 Austin(COLUMN)86(COLUMN)47 Baltimore(COLUMN)37(COLUMN)29 Billings(COLUMN)11(COLUMN)02 Birmingham(COLUMN)50(COLUMN)45 Bismarck(COLUMN)14(COLUMN)05 Boise(COLUMN)53(COLUMN)28 Boston(COLUMN)34(COLUMN)18 Brownsville(COLUMN)87(COLUMN)63 Buffalo(COLUMN)27(COLUMN)15 Burlington, Vt.(COLUMN)21(COLUMN)06 Casper(COLUMN)33(COLUMN)10 Christn, W. Va.(COLUMN)37(COLUMN)28 Charlotte(COLUMN)42(COLUMN)35 Cheyenne(COLUMN)30(COLUMN)17 Chicago(COLUMN)30(COLUMN)20 Cincinnati(COLUMN)34(COLUMN)24 Cleveland(COLUMN)36(COLUMN)21 Columbia, S. C.(COLUMN)45(COLUMN)38 Columbus(COLUMN)33(COLUMN)23 Dal.-Ft. Worth(COLUMN)63(COLUMN)39 Dayton(COLUMN)38(COLUMN)25 Denver(COLUMN)46(COLUMN)22 Des Moines(COLUMN)31(COLUMN)04 Detroit(COLUMN)30(COLUMN)20 Duluth(COLUMN)22(COLUMN)08 El Paso(COLUMN)73(COLUMN)53 Fairbanks(COLUMN)31(COLUMN)01 Fargo(COLUMN)06(COLUMN)15 Flagstaff(COLUMN)41(COLUMN)40 Great Falls(COLUMN)13(COLUMN)05 Hartford(COLUMN)34(COLUMN)12 Helena(COLUMN)27(COLUMN)11 Honolulu(COLUMN)79(COLUMN)66 Houston(COLUMN)80(COLUMN)52 Indianapolis(COLUMN)35(COLUMN)20 Jackson(COLUMN)63(COLUMN)44 Jacksonville(COLUMN)60(COLUMN)56 Juneau(COLUMN)43(COLUMN)24 Kansas City(COLUMN)34(COLUMN)20 Las Vegas(COLUMN)57(COLUMN)51 Little Rock(COLUMN)42(COLUMN)35 Los Angeles(COLUMN)64(COLUMN)56 Louisville(COLUMN)38(COLUMN)26 Memphis(COLUMN)48(COLUMN)38 Miami Beach(COLUMN)75(COLUMN)67 Midland(COLUMN)80(COLUMN)39 Milwaukee(COLUMN)25(COLUMN)13 Mpls. St. Paul(COLUMN)24(COLUMN)03 Nashville(COLUMN)39(COLUMN)35 New Orleans(COLUMN)73(COLUMN)56 New York(COLUMN)34(COLUMN)19 Norfolk(COLUMN)36(COLUMN)32 North Platte(COLUMN)20(COLUMN)10 Oklahoma City(COLUMN)40(COLUMN)33 Omaha(COLUMN)27(COLUMN)03 Orlando(COLUMN)77(COLUMN)67 Philadelphia(COLUMN)34(COLUMN)26 Phoenix(COLUMN)68(COLUMN)61 Pittsburg(COLUMN)36(COLUMN)25 Portland, Me.(COLUMN)31(COLUMN)02 Portland(COLUMN)51(COLUMN)30 Providence(COLUMN)31(COLUMN)13 Raleigh(COLUMN)40(COLUMN)32 Rapid City(COLUMN)12(COLUMN)04 Reno(COLUMN)56(COLUMN)41 Richmond(COLUMN)32(COLUMN)29 St. Louis(COLUMN)33(COLUMN)25 St. Prbg. Tam.(COLUMN)72(COLUMN)65 Salt Lake City(COLUMN)53(COLUMN)43 San Antonio(COLUMN)85(COLUMN)49 San Diego(COLUMN)72(COLUMN)63 San Francisco(COLUMN)63(COLUMN)56 San Juan(COLUMN)85(COLUMN)72 St. Ste. Marie(COLUMN)22(COLUMN)08 Seattle(COLUMN)48(COLUMN)30 Shreveport(COLUMN)71(COLUMN)42 Sioux Falls(COLUMN)18(COLUMN)08 Spokane(COLUMN)36(COLUMN)25 Syracuse(COLUMN)30(COLUMN)14 Topeka(COLUMN)34(COLUMN)21 Tucson(COLUMN)66(COLUMN)57 Tulsa(COLUMN)38(COLUMN)32 Washington(COLUMN)36(COLUMN)32 Wichita(COLUMN)36(COLUMN)24(END TABLE)

Temperatures Abroad Yesterday (TABLE) City(COLUMN)Weather(COLUMN)Time(COLUMN)Temp. Aberdeen(COLUMN)cloudy(COLUMN)1 p.m.(COLUMN)45 Amsterdam(COLUMN)pt. cldy.(COLUMN)1 p.m.(COLUMN)55 Ankara(COLUMN)clear(COLUMN)3 p.m.(COLUMN)59 Athens(COLUMN)clear(COLUMN)2 p.m.(COLUMN)64 Auckland(COLUMN)clear(COLUMN)midnight(COLUMN)63 Berlin(COLUMN)haze(COLUMN)1 p.m.(COLUMN)50 Birmingham(COLUMN)cloudy(COLUMN)1 p.m.(COLUMN)48 Brussels(COLUMN)pt. cldy.(COLUMN)1 p.m.(COLUMN)57 Casablanca(COLUMN)pt. cldy.(COLUMN)noon(COLUMN)64 Copenhagen(COLUMN)fog(COLUMN)1 p.m.(COLUMN)37 Dublin(COLUMN)cloudy(COLUMN)1 p.m.(COLUMN)46 Geneva(COLUMN)cloudy(COLUMN)1 p.m.(COLUMN)46 Hong Kong(COLUMN)rain(COLUMN)8 p.m.(COLUMN)63 Lisbon(COLUMN)cloudy(COLUMN)noon(COLUMN)57 London(COLUMN)rain(COLUMN)1 p.m.(COLUMN)52 Madrid(COLUMN)clear(COLUMN)1 p.m.(COLUMN)54 Malta(COLUMN)cloudy(COLUMN)1 p.m.(COLUMN)64 Manila(COLUMN)pt. cldy.(COLUMN)1 p.m.(COLUMN)64 Moscow(COLUMN)cloudy(COLUMN)3 p.m.(COLUMN)34 New Delhi(COLUMN)rain(COLUMN)5 p.m.(COLUMN)73 Nice(COLUMN)cloudy(COLUMN)1 p.m.(COLUMN)57 Oslo(COLUMN)cloudy(COLUMN)1 p.m.(COLUMN)34 Paris(COLUMN)cloudy(COLUMN)1 p.m.(COLUMN)52 Peking(COLUMN)clear(COLUMN)8 p.m.(COLUMN)36 Rome(COLUMN)cloudy(COLUMN)1 p.m.(COLUMN)59 Sofia(COLUMN)cloudy(COLUMN)2 p.m.(COLUMN)54 Stockholm(COLUMN)cloudy(COLUMN)1 p.m.(COLUMN)37 Sydney(COLUMN)clear(COLUMN)10 p.m.(COLUMN)70 Tel Aviv(COLUMN)cloudy(COLUMN)2 p.m.(COLUMN)77 Tokyo(COLUMN)clear(COLUMN)9 p.m.(COLUMN)36 Tunis(COLUMN)cloudy(COLUMN)1 p.m.(COLUMN)63 Vienna(COLUMN)cloudy(COLUMN)1 p.m.(COLUMN)46 Warsaw(COLUMN)cloudy(COLUMN)1 p.m.(COLUMN)41(END TABLE) (TABLE) Temperatures (Western Hemisphere) City(COLUMN)Weather(COLUMN)High(COLUMN)Low Acapulco(COLUMN)fair(COLUMN)90(COLUMN)73 Barbados(COLUMN)pt. cldy.(COLUMN)84(COLUMN)75 Bermuda(COLUMN)rain(COLUMN)64(COLUMN)57 Bogota(COLUMN)rain(COLUMN)70(COLUMN)44 Calgary(COLUMN)snow(COLUMN)07(COLUMN)09 Culiacan(COLUMN)fair(COLUMN)90(COLUMN)57 Edmonton(COLUMN)clear(COLUMN)07(COLUMN)22 Havana(COLUMN)clear(COLUMN)82(COLUMN)68 Kingston(COLUMN)pt. cldy.(COLUMN)84(COLUMN)73 Montego Bay(COLUMN)pt. cldy.(COLUMN)82(COLUMN)70 Mexico City(COLUMN)fair(COLUMN)79(COLUMN)52 Monterrey(COLUMN)fair(COLUMN)93(COLUMN)61 Montreal(COLUMN)clear(COLUMN)19(COLUMN)zero Nassau(COLUMN)clear(COLUMN)77(COLUMN)66 Ottawa(COLUMN)pt. cldy.(COLUMN)23(COLUMN)03 Regina(COLUMN)snow(COLUMN)93(COLUMN)13 St. Kitts(COLUMN)pt. cldy.(COLUMN)84(COLUMN)73 St. Thomas(COLUMN)pt. cldy.(COLUMN)83(COLUMN)70 Toronto(COLUMN)cloudy(COLUMN)27(COLUMN)10 Vancouver(COLUMN)clear(COLUMN)46(COLUMN)30 Veracruz(COLUMN)pt. cldy.(COLUMN)86(COLUMN)63 Winnipeg(COLUMN)snow(COLUMN)05(COLUMN)13(END TABLE)