Washington: Today - partly cloudly, high near 40, low near 20. Wind will be variable at less than 10 mph. The chance of precipitation is near zero today and 10 percent tonight. Thursday - Chance of snow high from the low 30s to near 40. Maryland and Virginia: Today - Partly cloudy, highs from the 30s to the 40s, lows from the teens to the 20s. Thursday - Chance of snow, highs from the 30s to the 40s.

Lower Patomac and Chesapeake Bay: Today - Partly cloudy with visibility of more than 5 miles. Wind will be from the northwest at from 10 to 15 knots today, becoming variable at from 6 to 12 knots tonight. Wave action in unprotected waters will be restricted by ice.

Extended Area Forecast for Friday through Sunday: Fair on Friday, chance of snow on Saturday and on Sunday morning. There will be a chance of rain during the latter period in southeastern Virginia. Highs will be from the 30s to near 40, lows from the teens to the 20s. Normal Washington temperatures for the period are a high of 46 and a low of 29.

West Virginia: Today - Partly cloudy, highs from the upper 20s to the mid 30s, lows from near 5 above zero to the teens. Thursday - Partly cloudy, highs from the upper 20s to the mid 30s.

Almanac Data for today - Sun Rises 7:00 a.m. sets 5:45 p.m.; moon rises 11:37 p.m.; sets 1:16 a.m.: Tides: high 1:42 a.m. and 2:11 p.m., low 8:34 p.m. and 9:12 p.m. High and low tides at the following locations may be obtained by subtracting the hours indicated from the tides above. Annapolis (1 1/2), Bloody Point Lighthouse (4 1/2), Deale, Md. (4 1/2), Colonial Beach (6), Norfolk (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 during the 2 p.m. to 3 p.m. period was 29 for the pollutant, photochemical oxidants. 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 Fails should be near 3.8 feet today. Local Temp., Humidity(TABLE) Time(COLUMN)T.(COLUMN)H. 12 mid.(COLUMN)32(COLUMN)85 1 a.m.(COLUMN)32(COLUMN)82 2 a.m.(COLUMN)32(COLUMN)82 3 a.m.(COLUMN)32(COLUMN)82 4 a.m.(COLUMN)32(COLUMN)82 5 a.m.(COLUMN)32(COLUMN)85 6 a.m.(COLUMN)33(COLUMN)82 7 a.m.(COLUMN)33(COLUMN)78 8 a.m.(COLUMN)32(COLUMN)78 9 a.m.(COLUMN)33(COLUMN)75 10 a.m.(COLUMN)34(COLUMN)73 11 a.m.(COLUMN)35(COLUMN)73 12 noon(COLUMN)36(COLUMN)70 1 p.m.(COLUMN)37(COLUMN)70 2 p.m.(COLUMN)38(COLUMN)67 3 p.m.(COLUMN)39(COLUMN)65 4 p.m.(COLUMN)39(COLUMN)62 5 p.m.(COLUMN)38(COLUMN)64 6 p.m.(COLUMN)37(COLUMN)67 7 p.m.(COLUMN)36(COLUMN)67(END TABLE) Temperature ending 8 a.m. (EST) yesterday:(TABLE) City(COLUMN)H.(COLUMN)L. Albany(COLUMN)32(COLUMN)13 Albuquerque(COLUMN)45(COLUMN)31 Amarillo(COLUMN)29(COLUMN)15 Anchorage(COLUMN)42(COLUMN)28 Asheville(COLUMN)40(COLUMN)34 Atlanta(COLUMN)67(COLUMN)36 Atlantic City(COLUMN)36(COLUMN)28 Austin(COLUMN)59(COLUMN)32 Baltimore(COLUMN)33(COLUMN)29 Billings(COLUMN)5(COLUMN)2 Birmingham(COLUMN)63(COLUMN)34 Bismarck(COLUMN)19(COLUMN) 3 Boise(COLUMN)35(COLUMN)32 Boston(COLUMN)32(COLUMN)26 Brownwville(COLUMN)73(COLUMN)46 Buffalo(COLUMN)24(COLUMN)14 Burlington(COLUMN)21(COLUMN) 1 Casper(COLUMN)12(COLUMN)13 Charleson, S.C.(COLUMN)62(COLUMN)46 Charleston, W. Va.(COLUMN)36(COLUMN)29 Charlotte(COLUMN)42(COLUMN)35 Cheyenne(COLUMN)18(COLUMN) 1 Chicago(COLUMN)30(COLUMN)17 Cincinnati(COLUMN)29(COLUMN)22 Cleveland(COLUMN)30(COLUMN)12 Columbia, S.C.(COLUMN)56(COLUMN)38 Columbus(COLUMN)28(COLUMN)19 Dal. Ft. Worth(COLUMN)43(COLUMN)26 Dayton(COLUMN)26(COLUMN)16 Denver(COLUMN)22(COLUMN) 8 Des Moines(COLUMN)26(COLUMN)22 Detroit(COLUMN)31(COLUMN) 6 Duluth(COLUMN)25(COLUMN)19 El Paso(COLUMN)53(COLUMN)42 Fairbanks(COLUMN)25(COLUMN)17 Fargo(COLUMN)10(COLUMN) 1 Flagstaff(COLUMN)32(COLUMN)28 Great Falls(COLUMN) 6(COLUMN)14 Hartford(COLUMN)36(COLUMN)24 Helena(COLUMN) 9(COLUMN) 7 Honolulu(COLUMN)86(COLUMN)71 Houston(COLUMN)57(COLUMN)36 Indianapolis(COLUMN)29(COLUMN)17 Jackson, Miss(COLUMN)57(COLUMN)30 Jacksonville(COLUMN)75(COLUMN)48 Juneau(COLUMN)35(COLUMN)28 Kansas City(COLUMN)29(COLUMN)22 Las Vegas(COLUMN)55(COLUMN)38 Little Rock(COLUMN)46(COLUMN)26 Los Angeles(COLUMN)58(COLUMN)42 Louisville(COLUMN)36(COLUMN)30 Memphis(COLUMN)54(COLUMN)34 Miami Beach(COLUMN)71(COLUMN)66 Midland-Odessa(COLUMN)55(COLUMN)29 Milwaukee(COLUMN)29(COLUMN)19 Mpls-St. Paul(COLUMN)29(COLUMN) 9 Nashville(COLUMN)54(COLUMN)33 New Orleans(COLUMN)65(COLUMN)42 New York(COLUMN)37(COLUMN)29 Norfolk(COLUMN)43(COLUMN)35 North Platte(COLUMN)15(COLUMN) 5 Oklahoma City(COLUMN)35(COLUMN)20 Omaha(COLUMN)24(COLUMN)13 Orlando(COLUMN)80(COLUMN)53 Philadelphia(COLUMN)33(COLUMN)28 Phoenix(COLUMN)60(COLUMN)45 Pittsburgh(COLUMN)28(COLUMN)25 Portland, Maine(COLUMN)34(COLUMN)12 Portland, Ore.(COLUMN)50(COLUMN)41 Providence(COLUMN)33(COLUMN)25 Raleigh(COLUMN)47(COLUMN)34 Rapid City(COLUMN)14(COLUMN) 0 Reno(COLUMN)40(COLUMN)25 Richmond(COLUMN)41(COLUMN)30 St. Louis(COLUMN)32(COLUMN)27 St. Prbg. Tampa(COLUMN)(COLUMN)70 50 Salt Lake City(COLUMN)40(COLUMN)34 San Antonio(COLUMN)65(COLUMN)33 San Diego(COLUMN)61(COLUMN)64 San Francisco(COLUMN)58(COLUMN)50 San Juan(COLUMN)84(COLUMN)69 St. Ste. Marie(COLUMN)25(COLUMN)10 Seattle(COLUMN)53(COLUMN)40 Shreveport(COLUMN)50(COLUMN)26 Sioux Falls(COLUMN)21(COLUMN) 1 Spokane(COLUMN)32(COLUMN)29 Syracuse(COLUMN)30(COLUMN)12 Topeka(COLUMN)31(COLUMN)22 Tucson(COLUMN)57(COLUMN)38 Tulsa(COLUMN)35(COLUMN)23 Washington(COLUMN)37(COLUMN)32 Wichita(COLUMN)33(COLUMN)13(END TABLE) Temperatures ABroad Yesterday(TABLE) City(COLUMN)Weather(COLUMN)Time(COLUMN)Temp Aberdeen(COLUMN)pt. cldy(COLUMN) 1 p.m.(COLUMN)34 Amsterdam(COLUMN)pt. cldy(COLUMN) 1 p.m.(COLUMN)37 Ankara(COLUMN)cloudy(COLUMN) 3 p.m.(COLUMN)63 Athens(COLUMN)rain(COLUMN) 2 p.m.(COLUMN)59 Auckland(COLUMN)pt. cldy(COLUMN)mndn.(COLUMN)72 Berlin(COLUMN)haze(COLUMN) 1 p.m.(COLUMN)32 Birmingham(COLUMN)clear(COLUMN) 1 p.m.(COLUMN)36 Brussels(COLUMN)snow(COLUMN) 1 p.m.(COLUMN)32 Casablanca(COLUMN)pt. cldy(COLUMN) noon(COLUMN)61 Copenhagen(COLUMN)snow(COLUMN) 1 p.m.(COLUMN)30 Dublin(COLUMN)clear(COLUMN) 1 p.m.(COLUMN)28 Geneva(COLUMN)clear(COLUMN) 1 p.m.(COLUMN)32 Hong Kong(COLUMN)rain(COLUMN) 8 p.m.(COLUMN)52 Lisbon(COLUMN)cloudy(COLUMN) noon(COLUMN)45 London(COLUMN)cloudy(COLUMN) 1 p.m.(COLUMN)34 Madrid(COLUMN)clear(COLUMN) 1 p.m.(COLUMN)43 Malta(COLUMN)pt. cldy(COLUMN) 1 p.m.(COLUMN)52 Manila(COLUMN)clear(COLUMN) 2 p.m.(COLUMN)81 Moscow(COLUMN)cloudy(COLUMN) 3 p.m.(COLUMN)32 New Dehli(COLUMN)cloudy(COLUMN) 5 p.m.(COLUMN)68 Nice(COLUMN)clear(COLUMN) 1 p.m.(COLUMN)50 Oslo(COLUMN)snow(COLUMN) 1 p.m.(COLUMN)10 Paris(COLUMN)cloudy(COLUMN) 1 p.m.(COLUMN)32 Peking(COLUMN)clear(COLUMN) 8 p.m.(COLUMN)21 Rome(COLUMN)rain(COLUMN) 1 p.m.(COLUMN)41 Saigon(COLUMN)clear(COLUMN) 8 p.m.(COLUMN)82 Sofia(COLUMN)cloudy(COLUMN) 2 p.m.(COLUMN)59 Stockholm(COLUMN)clear(COLUMN) 1 p.m.(COLUMN)12 Sydney(COLUMN)pt. cldy(COLUMN)10 p.m.(COLUMN)73 Tel Aviv(COLUMN)clear(COLUMN) 2 p.m.(COLUMN)82 Tokyo(COLUMN)cloudy(COLUMN) 9 p.m.(COLUMN)37 Tunis(COLUMN)pt. cldy(COLUMN) 1 p.m.(COLUMN)46 Vlenna(COLUMN)pt. cldy(COLUMN) 1 p.m.(COLUMN)34 Warsaw(COLUMN)cloudy(COLUMN) 1 P.m.(COLUMN)28(END TABLE) Temperatures(Western Hemisphere)(TABLE) City(COLUMN)Weather(COLUMN)High(COLUMN)Low Acapulco(COLUMN)cloudy(COLUMN)86(COLUMN)73 Barbados(COLUMN)clear(COLUMN)85(COLUMN)72 Bermuda(COLUMN)cloudy(COLUMN)62(COLUMN)56 Bogota(COLUMN)sunny(COLUMN)70(COLUMN)39 Calgary(COLUMN)snow(COLUMN)12(COLUMN)17 Cutiacan(COLUMN)clear(COLUMN)77(COLUMN)47 Edmonton(COLUMN)clear(COLUMN) 5(COLUMN)13 Havana(COLUMN)clear(COLUMN)81(COLUMN)65 Kingston(COLUMN)pt. cldy(COLUMN)82(COLUMN)72 Montego Bay(COLUMN)clear(COLUMN)82(COLUMN)69 Mexico City(COLUMN)cloudy(COLUMN)77(COLUMN)52 Monterrey(COLUMN)cloudy(COLUMN)73(COLUMN)41 Montreal(COLUMN)cloudy(COLUMN)21(COLUMN) 0 Nassau(COLUMN)clear(COLUMN)75(COLUMN)55 Ottawa(COLUMN)clear(COLUMN)19(COLUMN) 2 Regina(COLUMN)snow(COLUMN)16(COLUMN)11 St. Kitts(COLUMN)sunny(COLUMN)82(COLUMN)73 St. Thomas(COLUMN)sunny(COLUMN)83(COLUMN)65 Toronto(COLUMN)clear(COLUMN)27(COLUMN) 0 Vancouver(COLUMN)rain(COLUMN)43(COLUMN)37 Veracruz(COLUMN)cloudy(COLUMN)79(COLUMN)66 Winnipeg(COLUMN)snow(COLUMN)10(COLUMN) 0(END TABLE)