Washington: Today - Partly cloudy and windy, high in mid to upper 30s, low in low to mid 20s. Chance of precipitation 10 per cent today, near zero tonight. Tuesday - Mostly sunny, high in 40s.

Maryland and Virginia: Today - Partly cloudy and windy, high in 20s and 30s, low near 20. Chance of snow flurries in mountains today. Tuesday - Mostly sunny, high in 40s.

Lower Potomac and Chesapeake Bay: Today - Partly cloudy today, fair tonight with visibility of 5 miles or more through tonight. Winds should be northwesterly at 20 to 30 knots today, westerly at 10 to 15 knots tonight.

Extended Area Outlook: For Wednesday through Friday - Chance of precipitation through Thursday, fair skies Friday. Highs should average in 40s and 50s, lows in 20s and 30s through period. Washington's normal temperature range for this time of year is from 48 to 30.

Best Virginia: Today - Partly cloudy, high in upper 20s to 30s, lows from near zero to mid 20s. Tuesday - Sunny, high in 40s to low 50s.

The National Weather Forecast for Today - Snow will continue from Maine across the lower Great Lakes region into the northern Appalachans. Rain will spread across the Pacific northwest and north and central California. Elsewhere, fair or partly cloudy skies are expected. It will be much warmer across the Great Plains and the Mississippi Valley with cooler weather moving into the southern half of the Atlantic Coast states. Mild temperatures with seasonably cool or cold readings elsewhere.

ALMANC DATA FOR February 21 - Sun risers 6:52 a.m., set 5:52 p.m.; moon rises 8:29 a.m., sets 9:38 p.m. Tides: High 10:19 a.m. and 10:37 p.m. low 4:42 a.m. and 5:06 p.m. High and low tides at the following points can be obtained by subtracting the hours indicated from the tides above. Annapolis (3 1/2); Bloody Points 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 National Weather Service forecasts that the Potomac River stage at Little Falls will remain near 3.5 feet through today.

Washington data at 7 p.m. (EST) yesterday: Highest temperature since 7 a.m. yesterday, 42 degrees at 3:10 p.m. Lowest temperature since midnight, 36 degrees at 12:05 a.m. Record high temperature for today, 75 degrees in 1953. Record low temperature for today, 7 degrees in 1895. Deficiency of temperature since Feb. 1, 39 degrees Jan. 1, 343 degrees. Relative humidity: Maximum, 96 per cent at 4 a.m.; Maximum, 38 per cent at 4 p.m. 24 hour precipitation, trace Deficiency of precipitation since Feb. 1, 1.66 inches. Deficiency of precipitation sine Jan. 1, 2.78 inches. Highest observed wind since 7 a.m., 20 miles per hour from the N.W. at 4 p.m. Peak gust since 7 a.m. 37 miles per hour from the n.w. at 3:50 p.m. Local Temp., Humidity(TABLE) Time(COLUMN)T.(COLUMN)H. 12 mid(COLUMN)36(COLUMN)92 1 a.m.(COLUMN)37(COLUMN)92 2 a.m.(COLUMN)37(COLUMN)92 3 a.m.(COLUMN)37(COLUMN)92 4 a.m.(COLUMN)36(COLUMN)96 5 a.m.(COLUMN)36(COLUMN)96 6 a.m.(COLUMN)37(COLUMN)96 7 a.m.(COLUMN)37(COLUMN)96 8 a.m.(COLUMN)38(COLUMN)92 9 a.m.(COLUMN)39(COLUMN)79 10 a.m.(COLUMN)39(COLUMN)67 11 a.m.(COLUMN)39(COLUMN)67 12 noon(COLUMN)40(COLUMN)55 1 p.m.(COLUMN)39(COLUMN)50 2 p.m.(COLUMN)40(COLUMN)45 3 p.m.(COLUMN)40(COLUMN)45 4 p.m.(COLUMN)41(COLUMN)38 5 p.m.(COLUMN)39(COLUMN)42 6 p.m.(COLUMN)38(COLUMN)44(END TABLE) Temperatures ending 7 a.m. (EST) yesterday:(TABLE) CITY(COLUMN)H.(COLUMN)L. Albany(COLUMN)38(COLUMN)20 Albuquerque(COLUMN)62(COLUMN)37 Amarllo(COLUMN)55(COLUMN)32 Anchorage(COLUMN)48(COLUMN)40 Asheville(COLUMN)64(COLUMN)29 Atlanta(COLUMN)68(COLUMN)27 Atlantic City(COLUMN)39(COLUMN)30 Austin(COLUMN)67(COLUMN)36 Baltimore(COLUMN)46(COLUMN)33 Billings(COLUMN)54(COLUMN)34 Birmingham(COLUMN)66(COLUMN)29 Bismarck(COLUMN)37(COLUMN)21 Boise(COLUMN)59(COLUMN)33 Boston(COLUMN)38(COLUMN)27 Brownsville(COLUMN)81(COLUMN)59 Buffalo(COLUMN)32(COLUMN)18 Burlington, Vt.(COLUMN)29(COLUMN)24 Casper(COLUMN)50(COLUMN)26 Charleston, S.C.(COLUMN)68(COLUMN)50 Charleston, W.V.(COLUMN)51(COLUMN)26 Charlotte, N.C.(COLUMN)66(COLUMN)36 Cheyenne(COLUMN)51(COLUMN)23 Chicago(COLUMN)33(COLUMN)17 Clincinnatl(COLUMN)36(COLUMN)23 Cleveland(COLUMN)33(COLUMN)18 Columbia, S.C.(COLUMN)72(COLUMN)41 Columbus, Ohio(COLUMN)39(COLUMN)24 Dal.-Ft. Worth(COLUMN)57(COLUMN)37 Dayton(COLUMN)38(COLUMN)22 Denver(COLUMN)55(COLUMN)25 Des Moines(COLUMN)39(COLUMN)25 Detroit(COLUMN)36(COLUMN)21 Duluth(COLUMN)22(COLUMN)12 El Paso(COLUMN)67(COLUMN)32 Fairbanks(COLUMN)40(COLUMN)23 Fargo(COLUMN)29(COLUMN)16 Flagstaff(COLUMN)61(COLUMN)19 Great Falls(COLUMN)60(COLUMN)30 Harfford(COLUMN)38(COLUMN)24 Helena(COLUMN)55(COLUMN)20 Honolulu(COLUMN)82(COLUMN)68 Houston(COLUMN)70(COLUMN)48 Indianapolis(COLUMN)38(COLUMN)23 Jackson, Miss.(COLUMN)67(COLUMN)27 Jacksonville(COLUMN)72(COLUMN)56 Janeau(COLUMN)42(COLUMN)32 Kansas City(COLUMN)44(COLUMN)29 Las Vegas(COLUMN)77(COLUMN)41 Little Rock(COLUMN)56(COLUMN)32 Los Angeles(COLUMN)77(COLUMN)53 Louisville(COLUMN)47(COLUMN)26 Memphis(COLUMN)53(COLUMN)28 Miami Beach(COLUMN)70(COLUMN)60 Midland(COLUMN)61(COLUMN)35 Milwaukee(COLUMN)32(COLUMN)16 Mpis.-St. Paul(COLUMN)25(COLUMN)14 Nashville(COLUMN)51(COLUMN)28 New Orleans(COLUMN)75(COLUMN)45 New York(COLUMN)42(COLUMN)32 Norfolk(COLUMN)55(COLUMN)40 North Platte(COLUMN)47(COLUMN)12 Oklahoma City(COLUMN)55(COLUMN)30 Omaha(COLUMN)46(COLUMN)20 Orlando(COLUMN)74(COLUMN)53 Philadelphia(COLUMN)41(COLUMN)36 Phoenix(COLUMN)86(COLUMN)55 Pittsburgh(COLUMN)36(COLUMN)20 Portland, Me.(COLUMN)32(COLUMN) 9 Portland, Ore.(COLUMN)66(COLUMN)46 Providence(COLUMN)37(COLUMN)30 Raleigh(COLUMN)49(COLUMN)32 Rapid City(COLUMN)47(COLUMN)27 Reno(COLUMN)71(COLUMN)23 Richmond(COLUMN)55(COLUMN)33 St. Louis(COLUMN)42(COLUMN)24 St. Prbg.-Tampa(COLUMN)70(COLUMN)56 Salt Lake CIty(COLUMN)61(COLUMN)29 San Antonio(COLUMN)68(COLUMN)35 San Diego(COLUMN)67(COLUMN)54 San Francisco(COLUMN)59(COLUMN)50 San Juan, P.R.(COLUMN)83(COLUMN)71 St. Ste. Marie(COLUMN)19(COLUMN) 3 Seattle(COLUMN)67(COLUMN)46 Shreveport(COLUMN)66(COLUMN)28 Sloux Falls(COLUMN)38(COLUMN)21 Spokane(COLUMN)53(COLUMN)35 Syracuse(COLUMN)40(COLUMN)26 Tucson(COLUMN)81(COLUMN)47 Tulsa(COLUMN)56(COLUMN)32 Washington(COLUMN)46(COLUMN)36 Wichita(COLUMN)55(COLUMN)25(END TABLE)(TABLE) City(COLUMN)Weather(COLUMN)Time(COLUMN)Temp. Aberdeen(COLUMN)cloudy(COLUMN) 1 P.m.(COLUMN)39 Amsterdam(COLUMN)drizzle(COLUMN) 1 p.m.(COLUMN)46 Ankara(COLUMN)clear(COLUMN) 3 p.m.(COLUMN)48 Athens(COLUMN)pt. cldy(COLUMN) 2 p.m.(COLUMN)59 Auckland(COLUMN)cloudy(COLUMN)Midnight(COLUMN)70 Berlin(COLUMN)rain(COLUMN) 1 p.m.(COLUMN)39 Brimingham(COLUMN)rain(COLUMN) 1 p.m.(COLUMN)34 Brussels(COLUMN)rain(COLUMN) 1 p.m.(COLUMN)52 Cairo(COLUMN)pt. cldy(COLUMN) 2 p.m.(COLUMN)82 Casablanca(COLUMN)cloudy(COLUMN)noon(COLUMN)61 Copenheagen(COLUMN)pt. cldy.(COLUMN) 1 p.m.(COLUMN)41 Dublin(COLUMN)drizzle(COLUMN) 1 p.m.(COLUMN)41 Geneva(COLUMN)cloudy(COLUMN) 1 p.m.(COLUMN)57 Hong Kong(COLUMN)pt. cldy.(COLUMN) 8 p.m.(COLUMN)63 Lisbon(COLUMN)drizzle(COLUMN)noon(COLUMN)57 London(COLUMN)cloudy(COLUMN) 1 p.m.(COLUMN)48 Madrild(COLUMN)rain(COLUMN) 1 p.m.(COLUMN)55 Malta(COLUMN)pt. cldy(COLUMN) 1 p.m.(COLUMN)66 Manila(COLUMN)pt. cldy.(COLUMN) 8 p.m.(COLUMN)81 Moscow(COLUMN)cloudy(COLUMN) 3 p.m.(COLUMN)30 Nice(COLUMN)drizzle(COLUMN) 1 p.m.(COLUMN)50 Oslo(COLUMN)cloudy(COLUMN) 1 p.m.(COLUMN)26 Paris(COLUMN)cloudy(COLUMN) 1 p.m.(COLUMN)54 Peking(COLUMN)cloudy(COLUMN) 8 p.m.(COLUMN)27 Rome(COLUMN)pt. cldy.(COLUMN) 1 p.m.(COLUMN)59 Saigon(COLUMN)clear(COLUMN) 8 p.m.(COLUMN)77 Sofia(COLUMN)clear(COLUMN) 2 p.m.(COLUMN)52 Stockholm(COLUMN)snow(COLUMN) 1 p.m.(COLUMN)32 Sydney(COLUMN)cloudy(COLUMN)10 p.m.(COLUMN)68 Tel Aviy(COLUMN)pt. cldy.(COLUMN) 2 p.m.(COLUMN)75 Tokyo(COLUMN)clear(COLUMN) 9 p.m.(COLUMN)50 Tunis(COLUMN)pt. cldy.(COLUMN) 1 p.m.(COLUMN)66 Vienna(COLUMN)pt. cldy.(COLUMN) 1 p.m.(COLUMN)52 Warsaw(COLUMN)pt. cldy.(COLUMN)1 p.m.(COLUMN)41(END TABLE) Temperatures (Western Hemisphere)(TABLE) City(COLUMN)Weather(COLUMN)High(COLUMN)Low Acapulco(COLUMN)clear(COLUMN)86(COLUMN)77 Barbados(COLUMN)pt. cldy.(COLUMN)81(COLUMN)72 Bermuda(COLUMN)cloudy(COLUMN)68(COLUMN)60 Bogota(COLUMN)cloudy(COLUMN)68(COLUMN)36 Calgary(COLUMN)pt. cldy(COLUMN)52(COLUMN)30 Culiacan(COLUMN)pt. cldy.(COLUMN)90(COLUMN)55 Edmonton(COLUMN)cloudy(COLUMN)45(COLUMN)21 Havana(COLUMN)pt. cldy.(COLUMN)76(COLUMN)59 Montego Bay(COLUMN)pt. cldy.(COLUMN)77(COLUMN)70 Mexico City(COLUMN)clear(COLUMN)76(COLUMN)45 Monterrey(COLUMN)cloudy(COLUMN)88(COLUMN)57 Montreal(COLUMN)cloudy(COLUMN)28(COLUMN)16 Nassau(COLUMN)pt. cldy.(COLUMN)76(COLUMN)59 Offawa(COLUMN)haze(COLUMN)28(COLUMN)16 Regina(COLUMN)clear(COLUMN)43(COLUMN)14 St. Kitts(COLUMN)pt. cldy(COLUMN)85(COLUMN)73 Toronto(COLUMN)clear(COLUMN)30(COLUMN)14 Vancouver(COLUMN)cloudy(COLUMN)57(COLUMN)43 Veracruz(COLUMN)pt. cldy.(COLUMN)81(COLUMN)59 Winnipeg(COLUMN)snow(COLUMN)19(COLUMN)11(END TABLE)