Washington: Today - Partly cloudy, snow likely tonight, high near 30, low near 20. The chance of precipitation is 10 per cent today and 60 per cent tonight. Friday - Windy, high near 30.

Maryland and Virginia; Today - Partly cloudy, snow likely tonight, highs from the teens to the 30s, lows from near 10 to near 30. Friday - Windy, highs from the teens to the 30s. Snow will end by Friday.

Lower Potomac and Chesapeake Bay: Today - Partly cloudy, snow likely tonight. Visibility will be more than 5 miles today, but less than 3 miles tonight. Wind will be from the west-northwest at 15 to 30 knots. Waves in ice-free waters will average 2 to 3 feet.

West Virginia: Today - Partly Cloudy, snow likely tonight, highs in the 20s ti the 30s, lows in the teens. Friday - Snow, highs from the 20s to near 30.

Extended Area Forecast for Saturday through Monday - Cold through the period with a chance of snow by Sunday. Highs will average from the teens to the mid 20s, lows from near - 10 in the mountains to near 10 elsewhere. Normal Washington temperatures for the period are a high of 44 and a low of 27.

The National Weather Forecast for today - Snow will fall from the northern Atlantic across upper Michigan, the Ohio valley, Missouri, eastern Nebraska, the Dakotas and into the northern Rockies. Elsewhere, fair or partly cloudy skies are forecast. It will be much colder across the upper and middle Mississippi Valley, the Great Lakes, the northern and central plains are the northern Rockies. Warmer temperatures will move into the southern and central Atlantic Coast. Little temperature change is expected elsewhere.

Almanac Data for today - Sun rises 7:19 a.m., sets 5:24 p.m.; moon rises 11:37 a.m., sets 12:47 a.m. Tides: High 1:21 a.m. and 1:53 p.m., low 8:19 a.m. and 8:56 p.m. High and low tides at the following points can be obtained by subtracting the hours indicated from the tides above. Anapolis (3 1/4); Bloody Point Lighthouse (4 1/7); Deale, Md. (4 1/2); Colonial Beach (6); Norfold (1 1/2); Virginia Beach (1); Solomon's Island (6 1/2); Point Lookout (7).

The Council of Governments' Air Quality Index for yesterday showed the high reading in the Washington area during the 2 p.m. to 3 p.m. period was 16 for the pollutant, photochemical oxidants. Index values between zero and 24 indicate good air quality. When the index exceeds 100 the air becomes hazardous and persons with lung, heart and eye probalems should restrict their activity. The forecast for today indicates the air quality will remain good.

The National Weather Service forecasts that the Potomac River stage at Little Falls will be near 3.3 feet. Local Temp., Humidity(TABLE) Time(COLUMN)T.(COLUMN).(COLUMN)H. 12 mid.(COLUMN)32(COLUMN)59 1 a.m.(COLUMN)31(COLUMN)63 2 a.m.(COLUMN)30(COLUMN)63 3 a.m.(COLUMN)27(COLUMN)75 4 a.m.(COLUMN)27(COLUMN)75 5 a.m.(COLUMN)25(COLUMN)81 6 a.m.(COLUMN)26(COLUMN)75 7 a.m.(COLUMN)28(COLUMN)66 8 a.m.(COLUMN)30(COLUMN)58 9 a.m.(COLUMN)32(COLUMN)51 10 a.m.(COLUMN)34(COLUMN)52 11 a.m.(COLUMN)36(COLUMN)50 12 noon(COLUMN)37(COLUMN)48 1 p.m.(COLUMN)38(COLUMN)44 2 p.m.(COLUMN)38(COLUMN)44 3 p.m.(COLUMN)39(COLUMN)44 4 p.m.(COLUMN)39(COLUMN)44 5 p.m.(COLUMN)39(COLUMN)48 6 p.m.(COLUMN)37(COLUMN)54 7 p.m.(COLUMN)32(COLUMN)49(END TABLE) Temperstures ending 8 a.m. (EST) yesterday:(TABLE)$03,20,03,03 City(COLUMN)H.(COLUMN)L. Albany(COLUMN)35(COLUMN)23 lbuquerque(COLUMN)42(COLUMN)28 Amarillo(COLUMN)50(COLUMN)30 Asheville(COLUMN)36(COLUMN)13 Atlanta(COLUMN)41(COLUMN)22 Atlatic City(COLUMN)38(COLUMN)25 Austin(COLUMN)59(COLUMN)45 Baltimore(COLUMN)40(COLUMN)23 Billings(COLUMN)39(COLUMN)32 Birmingham(COLUMN)44(COLUMN)21 Bismarck(COLUMN)30(COLUMN)1 Boise(COLUMN)29(COLUMN)31 Boston(COLUMN)37(COLUMN)28 Boston(COLUMN)37(COLUMN)28 Brownsville(COLUMN)67(COLUMN)57 Buffalo(COLUMN)29(COLUMN)17 Burlington(COLUMN)30(COLUMN)22 Casper(COLUMN)34(COLUMN)19 Charleston, SC(COLUMN)49(COLUMN)32 Charleston WV(COLUMN)31(COLUMN)24 Charlotte(COLUMN)42(COLUMN)21 Cheyenne(COLUMN)38(COLUMN)25 Chicago(COLUMN)29(COLUMN)18 Cincinnati(COLUMN)29(COLUMN)18 Cleveland(COLUMN)29(COLUMN)17 Columbia, S.C.(COLUMN)49(COLUMN)27 Columbus(COLUMN)28(COLUMN)21 Dal.-Ft. Worth(COLUMN)57(COLUMN)37 Dayton(COLUMN)30(COLUMN)22 Denver(COLUMN)46(COLUMN)26 Des Moines(COLUMN)28(COLUMN)23 Detroit(COLUMN)31(COLUMN)19 Duluth(COLUMN)21(COLUMN)6 El Paso(COLUMN)58(COLUMN)49 Fairbanks(COLUMN)30(COLUMN)14 Fargo(COLUMN)26(COLUMN)-3 Flagstaff(COLUMN)38(COLUMN)20 Great Falls(COLUMN)39(COLUMN)29 Hartford(COLUMN)37(COLUMN)22 Helena(COLUMN)31(COLUMN)15 Honolulu(COLUMN)81(COLUMN)73 Houston(COLUMN)65(COLUMN)50 Indianapolis(COLUMN)27(COLUMN)20 Jackson, Miss.(COLUMN)52(COLUMN)29 Jacksonville(COLUMN)55(COLUMN)31 Jueau(COLUMN)42(COLUMN)39 Kansas City 34(COLUMN)J21 Las Vegas(COLUMN)55(COLUMN)42 Little Rock(COLUMN)48(COLUMN)36 Los Angeles(COLUMN)70(COLUMN)50 Louisville(COLUMN)32(COLUMN)26 Memphis(COLUMN)42(COLUMN)35 Miami Beach(COLUMN)76(COLUMN)41 Midland-Odessa(COLUMN)61(COLUMN)42 Ilwaukee(COLUMN)29(COLUMN)10 Mpls.-St. Paul(COLUMN)24(COLUMN)16 Nashville(COLUMN)37(COLUMN)26 New Orleans(COLUMN)56(COLUMN)32 New York(COLUMN)37(COLUMN)26 Norfolk(COLUMN)37(COLUMN)28 North Platte(COLUMN)40(COLUMN)27 Oklahoma City(COLUMN)51(COLUMN)26 Omaha(COLUMN)35(COLUMN)18 Orlando(COLUMN)61(COLUMN)36 Philadelphia(COLUMN)36(COLUMN)19 Phoenix(COLUMN)65(COLUMN)46 Pittsburgh(COLUMN)29(COLUMN)20 Portland, Me.(COLUMN)31(COLUMN)16 Portland, Ore.(COLUMN)47(COLUMN)23 Providence(COLUMN)35(COLUMN)26 Raleigh(COLUMN)44(COLUMN)20 Rapid City(COLUMN)36(COLUMN)26 Reno(COLUMN)38(COLUMN)29 Richmond(COLUMN)44(COLUMN)25 St. Louis(COLUMN)32(COLUMN)22 St. Prbg.-T'mpa(COLUMN)59(COLUMN)34 Salt Lake City(COLUMN)31(COLUMN)18 San Antonio(COLUMN)60(COLUMN)49 San Diego(COLUMN)71(COLUMN)91 San Francisco(COLUMN)59(COLUMN)49 San Juan(COLUMN)81(COLUMN)68 St Ste. Marie(COLUMN)19(COLUMN)5 Seattle(COLUMN)49(COLUMN)28 Shreveport(COLUMN)59(COLUMN)30 Sioux Falls(COLUMN)27(COLUMN)16 Spokane(COLUMN)27(COLUMN)25 Syracuse(COLUMN)32(COLUMN)21 Tucson(COLUMN)60(COLUMN)45 Tulsa(COLUMN)51(COLUMN)30 Washington(COLUMN)53(COLUMN)25 Wichita(COLUMN)52(COLUMN)21(END TABLE) Temperatures Abroad Yesterday(TABLE) City(COLUMN)Weather(COLUMN)Time(COLUMN)Temp. Aberdeen rain(COLUMN)1 p.m.(COLUMN)41 Amsterdam(COLUMN)rain(COLUMN)1 p.m.(COLUMN)45 Ankara(COLUMN)cloudy(COLUMN)3 p.m.(COLUMN)37 Athens(COLUMN)clear(COLUMN)2 p.m.(COLUMN)59 Auckland(COLUMN)clear(COLUMN)midbight(COLUMN)63 Berlin(COLUMN)pt. cldy.(COLUMN)1 p.m.(COLUMN)50 Birmington(COLUMN)cldy.(COLUMN)1 p.m.(COLUMN)46 Brussels(COLUMN)cloudy(COLUMN)1 P.m.(COLUMN)50 Cairo(COLUMN)cloudy(COLUMN)2 p.m.(COLUMN)63 Casablanca(COLUMN)cloudy(COLUMN)1 P.m.(COLUMN)63 Copenhagen(COLUMN)cloudy(COLUMN)1 p.m.(COLUMN)41 Dublin(COLUMN)cloudy(COLUMN)1 P.m.(COLUMN)41 Geneva(COLUMN)rain(COLUMN)1 p.m.(COLUMN)50 Hong Kong(COLUMN)clear(COLUMN)8 p.m.(COLUMN)64 Lisbon(COLUMN)cloudy(COLUMN)1 noon(COLUMN)55 London(COLUMN)cloudy(COLUMN)1 p.m.(COLUMN)46 Madrid(COLUMN)cloudy(COLUMN)1 p.m.(COLUMN)55 Matta(COLUMN)cloudy(COLUMN)1 p.m.(COLUMN)59 Manila(COLUMN)cloudy(COLUMN)8 p.m.(COLUMN)82 Moscow snow(COLUMN)3 p.m.(COLUMN)23 New Delhi(COLUMN)coludy(COLUMN)5 p.m.(COLUMN)66 Nice(COLUMN)cloudy(COLUMN)1 p.m.(COLUMN)54 Oslo(COLUMN)cloudy(COLUMN)1 p.m.(COLUMN)30 Paris(COLUMN)cloudy(COLUMN)1 p.m.(COLUMN)50 Peking(COLUMN)clear(COLUMN)8 p.m.(COLUMN)21 Rome(COLUMN)cloudy(COLUMN)1 p.m.(COLUMN)75 Sofia(COLUMN)cloudy(COLUMN)2 p.m.(COLUMN)39 Stockholm(COLUMN)snow(COLUMN)1 p.m.(COLUMN)30 Sydney(COLUMN)rain(COLUMN)10 p.m.(COLUMN)72 Tel Aviy(COLUMN)cloudt(COLUMN)2 p.m.(COLUMN)72 Tokyo(COLUMN)rain(COLUMN)9 p.m.(COLUMN)41 Tunts(COLUMN)cloudy(COLUMN)1 p.m.(COLUMN)61 Vienna(COLUMN)rain(COLUMN)1 p.m.(COLUMN)36 Varsaw(COLUMN)rain(COLUMN)1 p.m.(COLUMN)37(END TABLE) Temperatures (Western Hemisphere)(TABLE) City(COLUMN)Weather(COLUMN)High(COLUMN)Low Acapulco cloudy(COLUMN)86(COLUMN)76 Barbados(COLUMN)pt. cldy.(COLUMN)82(COLUMN)76 Bermuda(COLUMN)pt. cldy.(COLUMN)67(COLUMN)61 Bogota(COLUMN)cloudy(COLUMN)68(COLUMN)41 Caloary(COLUMN)pt. cldy(COLUMN)39(COLUMN)21 Culiacan(COLUMN)clear(COLUMN)79(COLUMN)65 Edmonton(COLUMN)cloudy(COLUMN)36(COLUMN)25 Havana(COLUMN)pt. cldy.(COLUMN)75(COLUMN)59 Montego Bay(COLUMN)clear(COLUMN)82(COLUMN)72 Mexico City(COLUMN)haze(COLUMN)64(COLUMN)49 Monerrey(COLUMN)clear(COLUMN)55(COLUMN)49 Nojtreal(COLUMN)pt. cldy.(COLUMN)27(COLUMN)18 Nassau(COLUMN)clear(COLUMN)79(COLUMN)61 Ottawa(COLUMN)pt. cldy.(COLUMN)25(COLUMN)12 Regina(COLUMN)cloudy(COLUMN)27(COLUMN)-6 St. Kitts(COLUMN)Cldar(COLUMN)85(COLUMN)72 Toronto(COLUMN)cloudy(COLUMN)30(COLUMN)16 Vancouver(COLUMN)fog(COLUMN)45(COLUMN)28 Veracruz(COLUMN)fog(COLUMN)79(COLUMN)61 Vinnipeg(COLUMN)clear(COLUMN)23(COLUMN)-13(END TABLE)