Washington: Today - Snow flurries and windy, high in low 40s, low in 20s. Chance of precipitation 70 per cent today, 20 per cent tonight. Monday - Fair and windy, high in mid to upper 30s.

Maryland and Virginia& Today - Windy with snow flurries likely, highs in 30s and 40s, low in 20s. Snow flurries likely throughout area today, likely in mountains tonight. Monday - Windy, snow flurries likely in mountains, highs mostly in 30s.

Lower Potomac and Chesapeake Bay: Today - Chance of snow flurries today, partly cloudy tonight. Visibility should be greater than 5 miles, decreasing locally to less than 3 miles in precipitation. Winds should be out of northwest at about 10 knots this morning, 15 to 25 knots this afternoon and 20 to 35 knots tonight.

Extended Areat Outlook: For Tuesday through Thursday - Fair skies through Wednesday followed by chance of precitpitation Thursday. Highs should average near 50, lows near 30. Washington's normal temperature range for this time of year is from 48 to 29.

West Virginia: Today - Snow likely today with flurries possible tonight, highs mid 20s to 30s, lows in teens. Monday - Chance of snow flurries, highs 20s to low 30s.

The National Weather Forecast for Today - Snow will fall from the northern and central Atlantic Coast states across the lower Great Lakes region, the upper Ohio Valley, the northern Appalachians, Upper Michigan and around much of Lake Michigan. Rain will fall from the Carolinas into southern Virginia as well as across the northern half of the Pacific Coast states. Elsewhere, fair or partly cloudy skies are forecast. It will be unseasonably warm from the Great Plains westward. Seasonably cool to cold weather will prevail elsewhere.

Almanac data for February 20 - Sun rises 6:53 a.m., sets 5:51 p.m.; moon rises 7:58 a.m., sets 8:40 p.m. Tides: High 9:41 a.m. and 10 p.m., low 4 a.m. and 4:23 p.m. High and low tides at the following points can be obtained by subtracting the hours indicated from the tides above. Annapolis (3 1/4); Bloody Point Lighthouse (4 1/2); Deale, Md. (4 1/2); Colonial Beach (6); Norfolk (1 1/2); Virginia Beach (1); Solomon's Island (6 1/2); Point Lookout (7).

The Council of Government's Air Quality Index for yesterday showed the high reading in the Washington area during the 9 to 10 a.m. period was 22 for the pollutant, sulfur dioxide. Index values between 0 and 24 indicate good air quality. When the index exceeds 100 the air becomes harzardous and persons with lung, heart and eye problems should restrict their activity. The forecast for today indicates the air quality will remain about the same.

The National Weather Service forecasts that the Potomac River stage at Little Falls will remain near 3.6 feet through Monday night. Local Temp., Humidity(TABLE) Time(COLUMN)T.(COLUMN)H. 12 mid.(COLUMN)35(COLUMN)92 1 a.m.(COLUMN)35(COLUMN)92 2 a.m.(COLUMN)35(COLUMN)89 3 a.m.(COLUMN)35(COLUMN)89 4 a.m.(COLUMN)33(COLUMN)89 5 a.m.(COLUMN)33(COLUMN)89 6 a.m.(COLUMN)33(COLUMN)92 7 a.m.(COLUMN)33(COLUMN)92 8 a.m.(COLUMN)33(COLUMN)92 9 a.m.(COLUMN)34(COLUMN)89 10 a.m.(COLUMN)35(COLUMN)85 11 a.m.(COLUMN)36(COLUMN)85 12 noon(COLUMN)39(COLUMN)76 1 p.m.(COLUMN)41(COLUMN)73 2 p.m.(COLUMN)44(COLUMN)68 3 p.m.(COLUMN)46(COLUMN)63 4 p.m.(COLUMN)45(COLUMN)65 5 p.m.(COLUMN)45(COLUMN)65(END TABLE) Temperatures ending 7 a.m. (EST) yesterday:(TABLE) City(COLUMN)H(COLUMN)L Albany(COLUMN)31(COLUMN)23 Albuquerque(COLUMN)68(COLUMN)39 Amarillo(COLUMN)70(COLUMN)33 Anchorage(COLUMN)37(COLUMN)33 Asheville(COLUMN)60(COLUMN)24 Atlanta(COLUMN)67(COLUMN)40 Atlantic City(COLUMN)33(COLUMN)32 Austin(COLUMN)78(COLUMN)51 Baltimore(COLUMN)37(COLUMN)31 Billings(COLUMN)46(COLUMN)25 Birmingham(COLUMN)70(COLUMN)40 Bismarck(COLUMN)32(COLUMN)28 Boise(COLUMN)57(COLUMN)32 Boston(COLUMN)33(COLUMN)22 Brownsville(COLUMN)77(COLUMN)58 Buffalo(COLUMN)35(COLUMN)30 Burlington, Vt.(COLUMN)24(COLUMN)19 Casper(COLUMN)40(COLUMN)23 Charleston, S.C.(COLUMN)57(COLUMN)50 Charleston, W.Va.(COLUMN)33(COLUMN)32 Charlotte, N.C.(COLUMN)51(COLUMN)31 Cheyenne(COLUMN)46(COLUMN)16 Chicago(COLUMN)44(COLUMN)25 Cincinnati(COLUMN)43(COLUMN)31 Cleveland(COLUMN)35(COLUMN)27 Columbia, S.C.(COLUMN)61(COLUMN)37 Columbus, Ohio(COLUMN)33(COLUMN)26 Dal.-Ft. Worth(COLUMN)73(COLUMN)44 Dayton(COLUMN)38(COLUMN)31 Denver(COLUMN)59(COLUMN)29 Des Moines(COLUMN)53(COLUMN)20 Detroit(COLUMN)37(COLUMN)24 Duluth(COLUMN)26(COLUMN) 2 El Paso(COLUMN)75(COLUMN)35 Fairbanks(COLUMN)27(COLUMN)16 Fargo(COLUMN)24(COLUMN) 3 Flagstaff(COLUMN)65(COLUMN)19 Great Falls(COLUMN)45(COLUMN)27 Hartford(COLUMN)31(COLUMN)21 Helena(COLUMN)53(COLUMN)24 Honolulu(COLUMN)81(COLUMN)69 Houston(COLUMN)77(COLUMN)59 Indianapolis(COLUMN)46(COLUMN)33 Jackson, Miss(COLUMN)72(COLUMN)52 Jacksonville(COLUMN)69(COLUMN)51 Juneau(COLUMN)50(COLUMN)46 Kansas City(COLUMN)57(COLUMN)30 Las Vegas(COLUMN)81(COLUMN)44 Little Rock(COLUMN)69(COLUMN)50 Los Angeles(COLUMN)72(COLUMN)54 Louisville(COLUMN)57(COLUMN)32 Memphis(COLUMN)66(COLUMN)43 Miami Beach(COLUMN)64(COLUMN)55 Midland(COLUMN)77(COLUMN)37 Milwaukee(COLUMN)39(COLUMN)27 Mpls.-St. Paul(COLUMN)35(COLUMN)11 Nashsville(COLUMN)61(COLUMN)36 New Orleans(COLUMN)75(COLUMN)53 New York(COLUMN)34(COLUMN)29 Norfolk(COLUMN)44(COLUMN)29 North Platte(COLUMN)56(COLUMN)19 Oklahoma City(COLUMN)71(COLUMN)41 Omaha(COLUMN)57(COLUMN)25 Orlando(COLUMN)68(COLUMN)43 Philadelphia(COLUMN)34(COLUMN)31 Phoenix(COLUMN)86(COLUMN)54 Pittsburgh(COLUMN)37(COLUMN)31 Portland, Me.(COLUMN)29(COLUMN) 8 Portland, Ore.(COLUMN)68(COLUMN)40 Providence(COLUMN)32(COLUMN)21 Raleigh(COLUMN)39(COLUMN)28 Rapid City(COLUMN)46(COLUMN)23 Reno(COLUMN)67(COLUMN)25 Richmond(COLUMN)42(COLUMN)30 St. Louis(COLUMN)55(COLUMN)32 St. Pbg-Tampa(COLUMN)64(COLUMN)52 Salt Lake City(COLUMN)59(COLUMN)27 San Antonio(COLUMN)80(COLUMN)45 San Diego(COLUMN)67(COLUMN)54 San Francisco(COLUMN)73(COLUMN)49 San Juan P.R.(COLUMN)83(COLUMN)72 St. Ste Marie(COLUMN)27(COLUMN)13 Seattle(COLUMN)62(COLUMN)40 Shreveport(COLUMN)76(COLUMN)42 Sioux Falls(COLUMN)44(COLUMN)13 Spokane(COLUMN)53(COLUMN)34 Syracuse(COLUMN)33(COLUMN)29 Tucson(COLUMN)80(COLUMN)49 Tulsa(COLUMN)70(COLUMN)39 Washington(COLUMN)39(COLUMN)32 Wichita(COLUMN)71(COLUMN)31(END TABLE) Temperatures Abroad Yesterday(TABLE) City(COLUMN)Weather(COLUMN)Time(COLUMN)Temp. Aberdeen(COLUMN)rain(COLUMN)1 p.m.(COLUMN)37 Amsterdam(COLUMN)clear(COLUMN)1 p.m.(COLUMN)46 Ankara(COLUMN)clear(COLUMN)3 p.m.(COLUMN)45 Athens(COLUMN)clear(COLUMN)2 p.m.(COLUMN)59 Auckland(COLUMN)clear(COLUMN)midnight(COLUMN)70 Berlin(COLUMN)rain(COLUMN)1 p.m.(COLUMN)46 Birmingham(COLUMN)cloudy(COLUMN)1 p.m.(COLUMN)45 Brussels(COLUMN)cloudy(COLUMN)1 p.m.(COLUMN)46 Cairo(COLUMN)clear(COLUMN)2 p.m.(COLUMN)68 Casablanca(COLUMN)cloudy(COLUMN)noon(COLUMN)61 Copenhagen(COLUMN)cloudy(COLUMN)1 p.m.(COLUMN)37 Dublin(COLUMN)clear(COLUMN)1 p.m.(COLUMN)45 Geneva(COLUMN)cloudy(COLUMN)1 p.m.(COLUMN)57 Hong Kong(COLUMN)clear(COLUMN)8 p.m.(COLUMN)55 Lisbon(COLUMN)drizzle(COLUMN)noon(COLUMN)57 London(COLUMN)cloudy(COLUMN)1 p.m.(COLUMN)46 Madrid(COLUMN)cloudy(COLUMN)1 p.m.(COLUMN)55 Malta(COLUMN)cloudy(COLUMN)1 p.m.(COLUMN)63 Manila(COLUMN)clear(COLUMN)8 p.m.(COLUMN)73 Moscow(COLUMN)snow(COLUMN)3 p.m.(COLUMN)28 New Delhi(COLUMN)clear(COLUMN)5 p.m.(COLUMN)82 Nice(COLUMN)rain(COLUMN)1 p.m.(COLUMN)50 Oslo(COLUMN)cloudy(COLUMN)1 p.m.(COLUMN)28 Paris(COLUMN)cloudy(COLUMN)1 p.m.(COLUMN)48 Peking(COLUMN)clear(COLUMN)8 p.m.(COLUMN)37 Rome(COLUMN)cloudy(COLUMN)1 p.m.(COLUMN)59 Saigon(COLUMN)clear(COLUMN)8 p.m.(COLUMN)79 Sofia(COLUMN)clear(COLUMN)2 p.m.(COLUMN)52 Stockholm(COLUMN)snow(COLUMN)1 p.m.(COLUMN)28 Sydney(COLUMN)clear(COLUMN)10 p.m.(COLUMN)66 Tel Aviv(COLUMN)clear(COLUMN)2 p.m.(COLUMN)66 Tokyo(COLUMN)clear(COLUMN)9 p.m.(COLUMN)46 Tunis(COLUMN)clear(COLUMN)1 p.m.(COLUMN)63 Vienna(COLUMN)cloudy(COLUMN)1 p.m.(COLUMN)39 Warsaw(COLUMN)cloudy(COLUMN)1 p.m.(COLUMN)43(END TABLE) Temperatures (Western Hemisphere)(TABLE) City(COLUMN)Weather(COLUMN)High(COLUMN)Low Acapulco(COLUMN)clear(COLUMN)87(COLUMN)75 Bardados(COLUMN)rain(COLUMN)82(COLUMN)72 Bermuda(COLUMN)pt. cldy.(COLUMN)63(COLUMN)55 Bogota(COLUMN)cloudy(COLUMN)68(COLUMN)36 Havana(COLUMN)cloudy(COLUMN)76(COLUMN)59 Montego Bay(COLUMN)rain(COLUMN)77(COLUMN)73 Mexico City(COLUMN)cloudy(COLUMN)72(COLUMN)46 Monterrey(COLUMN)clear(COLUMN)86(COLUMN)50 Nassau(COLUMN)pt. cldy.(COLUMN)86(COLUMN)52 St. Kitts(COLUMN)clear(COLUMN)85(COLUMN)72 St. Thomas(COLUMN)pt. cldy.(COLUMN)84(COLUMN)73 Veracruz(COLUMN)pt. cldy.(COLUMN)77(COLUMN)57(END TABLE)