Washington: Today - Increasing cloudiness, high in upper 40s, low 35 to 40. Chance of precipitation is 40 percent today and 70 percent tonight. Winds will be light and variable. Thursday - partly cloudy, high 55 to 60.

Maryland and Virginia: Today - Cloudy with rain likely, spreading north and east across the state. The highs will be in the 40s to mid 50s and lows in the 30s. Thursday - Variable cloudiness and windy, high in 50s.

Lower Potamac and Chesapeake Bay: Today - Fair, visibility more than five miles. Winds will be variable at 15 knots. Waves in unprotected waters will be one foot or less.

Extended Area Outlook for Friday through Sunday: Partly cloudy with seasonable temperatures through the period. Highs will average in the mid 40s to mid 50s. The lows will be in the mid 20s and the mid 30s. Normal Washington temperatures for the period will be a high of 49 and a low of 33.

West Virginia: Today - Partly sunny, highs in mid 40s to mid 50s, lows 35 to 40. Partly cloudy with a chance of snow flurries in north portions. The highs will be in the low 40s to low 50s.

The Nation Yesterday: Snow covered the ground from the upper Great Lakes region across the Dakotas into the Rockies. Even with plenty of sunshine and strong southwesterly winds temperatures over the northern Plains were barely above zero. International Falls, Mn. was 53 degrees below zero. The temperatures were not as severe in Montana and Wyoming but the winds were. Westerly winds at 25 to 30 mph were common throughout eastern Montana and eastern Wyoming bringing the temperatures into the 40s. Cheyenne, Wyo. had wind gusts to 50 mph. The strong winds were blowing snow from the ground into the air reducing visibilities to zero in many areas. The ice packed roadways were also making traveling hazardous. Many trucks were blown off the highways of southeastern Wyoming. It was snowing in Maine. Caribou had 1 inch of fresh snow for a total of 7 inches on the ground.

Fresh snow was falling over the Great Lakes region and the northern Plains. Glasgow, Mont., had 1 more inch this morning for a total of 6 inches on the ground. A cold front was spreading showers through the southern states but most were light. With cloudy skies temperatures were mostly in the 50s. Southern Florida was enjoying sunny skies with readings in the middle 80s. Most of the Plains were sunny and cool with the southwest and the West Coast mostly sunny and mild. The Pacific Northwest had showers that were turning to snow in the higher elevations.

The National Weather Forecast for today sunshine will blanket most of the nation.With the snow leaving, the Northeast temperatures will rise into the 40s. Thundershowers will be widely scattered along the Gulf Coast. Rain will move across the coast of the Pacific Northwest and turn to snow as it moves through the northern Rockies. Snow will spread as far east as upper Great Lakes region. The West Coast will be mild with rather cool temperatures across the Southwest. The South will be cool but humid with partly cloudy skies. With sunshine most of the Plains will be mild.

ALMANAC DATA FOR TODAY: The sun rises 7:05 a.m., sets 4:47 p.m.; moon rises 6:01, sets 4:42. Tides: high 6:47 a.m. and 7:12 p.m. low 1:25 a.m. and 1:30 p.m. High and low tides at the following locations may be obtained by subtracting the hours indicated from the hours above: Annapolis (3 1/4), Bloody Point Lighthouse (4 1/2), Deale, Md. (4 1/2), Colonial Beach (5 1/4), Norfolk (1), Virginia Beach (3/4), Solomons Island (6 1/4), Point Lookout (7).

The Council of Government's Air Quality Index for yesterday showed the high reading in the Washington area during the 3 p.m. period was 19 for the pollutant, Carbon Monoxide. Index values between 0 and 24 indicate good 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 good.

The National Weather Service forecasts the Potomac River stage at Little Falls should remain near 3 feet today.

Washington data for yesterday: Highest temperature since midnight yesterday, 50 degrees at 4:15 p.m. Lowest temperature since midnight, 37 degrees at 1 a.m. Excess of temperature since Nov. 1, 128 degrees. Excess of temperature since Jan. 1, 222 degrees. Record high temperature for today, 73 degrees in 1905. Record low temperature for today, 14 degrees in 1930. Relative humidity: maximum, 89 percent at 5 a.m.; mininum, 50 percent at 6 a.m. deficiency of precipitation since Nov. 1, .85 inches. Deficiency of precipitation since Jan. 1, .55 inches. Highest observed wind since 7 a.m., 14 miles per hour from the northwest at 3 p.m. Peak gust since 7 a.m., 20 miles per hour from the northwest at 2:42 p.m. Local Temps, Humidity(TABLE) Time(COLUMN)T.(COLUMN)H. 12 midnite(COLUMN)37(COLUMN)82 1 a.m.(COLUMN)37(COLUMN)85 2 a.m.(COLUMN)37(COLUMN)85 3 a.m.(COLUMN)37(COLUMN)85 4 a.m.(COLUMN)38(COLUMN)85 5 a.m.(COLUMN)38(COLUMN)89 6 a.m.(COLUMN)38(COLUMN)89 7 a.m.(COLUMN)38(COLUMN)89 8 a.m.(COLUMN)42(COLUMN)76 9 a.m.(COLUMN)42(COLUMN)76 10 a.m.(COLUMN)42(COLUMN)79 11 a.m.(COLUMN)42(COLUMN)79 12 noon(COLUMN)45(COLUMN)73 1 p.m.(COLUMN)46(COLUMN)74 2 p.m.(COLUMN)48(COLUMN)71 3 p.m.(COLUMN)49(COLUMN)63 4 p.m.(COLUMN)49(COLUMN)61 5 p.m.(COLUMN)48(COLUMN)52 6 p.m.(COLUMN)48(COLUMN)50 7 p.m.(COLUMN)48(COLUMN)46(END TABLE) Temperatures ending 7 a.m. (EST) yesterday:(TABLE) City(COLUMN)H.(COLUMN)L Albany(COLUMN)22(COLUMN)19 Albuquerque(COLUMN)45(COLUMN)24 Amarillo(COLUMN)44(COLUMN)21 Anchorage(COLUMN)41(COLUMN)35 Asheville(COLUMN)56(COLUMN)50 Atlanta(COLUMN)61(COLUMN)54 Atlantic City(COLUMN)51(COLUMN)38 Austin(COLUMN)60(COLUMN)39 Baltimore(COLUMN)37(COLUMN)34 Billings(COLUMN)35(COLUMN)29 Birmingham(COLUMN)63(COLUMN)46 Bismarck(COLUMN)27(COLUMN)-09 Boise(COLUMN)42(COLUMN)26 Boston(COLUMN)36(COLUMN)26 Brownsville(COLUMN)78(COLUMN)48 Buffalo(COLUMN)31(COLUMN)27 Burlington(COLUMN)19(COLUMN)17 Casper(COLUMN)27(COLUMN)21 Charleston, S.C.(COLUMN)75(COLUMN)64 Charleston, WVa.(COLUMN)62(COLUMN)46 Charlotte(COLUMN)48(COLUMN)42 Cheyenne(COLUMN)30(COLUMN)15 Chicago(COLUMN)35(COLUMN)20 Cincinnatti(COLUMN)53(COLUMN)35 Cleveland(COLUMN)43(COLUMN)35 Columbia, S.C.(COLUMN)62(COLUMN)57 Columbus(COLUMN)51(COLUMN)36 Dal.-Ft. Worth(COLUMN)51(COLUMN)33 Dayton(COLUMN)49(COLUMN)33 Denver(COLUMN)32(COLUMN)22 Des Moines(COLUMN)31(COLUMN)09 Detroit(COLUMN)30(COLUMN)26 Duluth(COLUMN)27(COLUMN)04 El Paso(COLUMN)52(COLUMN)30 Fairbanks(COLUMN)27(COLUMN)14 Fargo(COLUMN)19(COLUMN)11 Flagstaff(COLUMN)30(COLUMN)11 Great Falls(COLUMN)34(COLUMN)30 Hartford(COLUMN)24(COLUMN)18 Helena(COLUMN)30(COLUMN)22 Honolulu(COLUMN)83(COLUMN)70 Houston(COLUMN)64(COLUMN)46 Indianapolis(COLUMN)44(COLUMN)34 Jackson, Miss.(COLUMN)65(COLUMN)42 Jacksonville(COLUMN)82(COLUMN)58 Juneau(COLUMN)45(COLUMN)41 Kansas City(COLUMN)33(COLUMN)20 Las Vegas(COLUMN)55(COLUMN)33 Little Rock(COLUMN)59(COLUMN)32 Los Angeles(COLUMN)68(COLUMN)46 Louisville(COLUMN)55(COLUMN)38 Memphis(COLUMN)62(COLUMN)35 Miami Beach(COLUMN)81(COLUMN)74 Midland-Odessa(COLUMN)46(COLUMN)30 Milwaukee(COLUMN)33(COLUMN)24 Mpls-St. Paul(COLUMN)29(COLUMN)04 Nashville(COLUMN)65(COLUMN)39 New Orleans(COLUMN)67(COLUMN)56 New York(COLUMN)36(COLUMN)33 Norfolk(COLUMN)61(COLUMN)49 North Platte(COLUMN)32(COLUMN)03 Oklahoma City(COLUMN)46(COLUMN)27 Omaha(COLUMN)31(COLUMN)06 Orlando(COLUMN)84(COLUMN)60 Philadelphia(COLUMN)38(COLUMN)34 Phoenix(COLUMN)65(COLUMN)43 Pittsburgh(COLUMN)45(COLUMN)37 Portland, Me.(COLUMN)20(COLUMN)15 Portland, Ore.(COLUMN)40(COLUMN)36 Providence(COLUMN)35(COLUMN)26 Raleigh(COLUMN)46(COLUMN)42 Rapid City(COLUMN)30(COLUMN)10 Reno(COLUMN)44(COLUMN)21 Richmond(COLUMN)42(COLUMN)39 St. Louis(COLUMN)43(COLUMN)29 St. Prbg-Tampa(COLUMN)82(COLUMN)69 Salt Lake City(COLUMN)40(COLUMN)29 San Antonio(COLUMN)62(COLUMN)45 San Diego(COLUMN)68(COLUMN)51 San Francisco(COLUMN)60(COLUMN)50 San Juan(COLUMN)88(COLUMN)77 St. Ste. Marie(COLUMN)22(COLUMN)13 Seattle(COLUMN)43(COLUMN)40 Shreveport(COLUMN)54(COLUMN)36 Sioux Falls(COLUMN)29(COLUMN)-03 Spokane(COLUMN)32(COLUMN)28 Syracuse(COLUMN)25(COLUMN)19 Topeka(COLUMN)36(COLUMN)19 Tucson(COLUMN)58(COLUMN)39 Tulsa(COLUMN)47(COLUMN)28 Washington(COLUMN)38(COLUMN)37 Wichita(COLUMN)44(COLUMN)26(END TABLE) Temperatures Abroad Yesterday(TABLE) City(COLUMN)Weather(COLUMN)Time(COLUMN)Temp. Aberdeen(COLUMN)clear(COLUMN)1 p.m.(COLUMN)34 Amsterdam(COLUMN)clear(COLUMN)1 p.m.(COLUMN)41 Ankara(COLUMN)rain(COLUMN)3 p.m.(COLUMN)41 Athens(COLUMN)pt. cldy(COLUMN)2 p.m.(COLUMN)63 Aucklands(COLUMN)cloudy(COLUMN)12 a.m.(COLUMN)61 Berlin(COLUMN)pt. cldy(COLUMN)1 p.m.(COLUMN)34 Birmingham(COLUMN)clear(COLUMN)1 p.m.(COLUMN)34 Bonn(COLUMN)cloudy(COLUMN)1 p.m.(COLUMN)34 Brussels(COLUMN)cloudy(COLUMN)1 p.m.(COLUMN)34 Casablanca(COLUMN)cloudy(COLUMN)noon(COLUMN)61 Copenhagen(COLUMN)clear(COLUMN)1 p.m.(COLUMN)37 Dublin(COLUMN)clear(COLUMN)1 p.m.(COLUMN)36 Geneva(COLUMN)cloudy(COLUMN)1 p.m..(COLUMN)32 Hong Kong(COLUMN)cloudy(COLUMN)8 p.m.(COLUMN)63 Jerusalem(COLUMN)cloudy(COLUMN)2 p.m.(COLUMN)63 Lisbon(COLUMN)pt. cldy(COLUMN)noon(COLUMN)63 London(COLUMN)clear(COLUMN)1 p.m.(COLUMN)36 Madrid(COLUMN)clear(COLUMN)1 p.m.(COLUMN)50 Malta(COLUMN)storm(COLUMN)1 p.m.(COLUMN)57 Manila(COLUMN)pt. cldy(COLUMN)8 p.m.(COLUMN)77 Moscow(COLUMN)rain(COLUMN)3 p.m.(COLUMN)37 New Delhi(COLUMN)clear(COLUMN)5 p.m.(COLUMN)66 Nice(COLUMN)cloudy(COLUMN)1 p.m.(COLUMN)46 Oslo(COLUMN)clear(COLUMN)1 p.m.(COLUMN)28 Paris(COLUMN)cloudy(COLUMN)1 p.m.(COLUMN)37 Peking(COLUMN)clear(COLUMN)8 p.m.(COLUMN)30 Rome(COLUMN)cloudy(COLUMN)1 p.m.(COLUMN)48 Saigon(COLUMN)cloudy(COLUMN)8 p.m.(COLUMN)77 Sofia(COLUMN)rain(COLUMN)2 p.m.(COLUMN)46 Stockholm(COLUMN)snow(COLUMN)1 p.m.(COLUMN)30 Sydney(COLUMN)clear(COLUMN)10 p.m.(COLUMN)72 Tokyo(COLUMN)clear(COLUMN)9 p.m.(COLUMN)50 Tunis(COLUMN)storm(COLUMN)1 p.m.(COLUMN)45 Vienna(COLUMN)cloudy(COLUMN)1 p.m.(COLUMN)34 Warsaw(COLUMN)cloudy(COLUMN)1 p.m.(COLUMN)34(END TABLE) Temperatures (Western Hemisphere)(TABLE) City(COLUMN)Weather(COLUMN)High(COLUMN)Low Acapulco(COLUMN)pt. cldy(COLUMN)87(COLUMN)72 Barbados(COLUMN)fair(COLUMN)84(COLUMN)78 Bermuda(COLUMN)pt. cldy(COLUMN)74(COLUMN)71 Bogota(COLUMN)pt. cldy(COLUMN)08(COLUMN)37 Calgary(COLUMN)clear(COLUMN)41(COLUMN)36 Edmonton(COLUMN)cloudy(COLUMN)39(COLUMN)30 Havana(COLUMN)fair(COLUMN)84(COLUMN)64 Kingston(COLUMN)pt. cldy(COLUMN)87(COLUMN)75 Montego Bay(COLUMN)cloudy(COLUMN)85(COLUMN)70 Mexico City(COLUMN)haze(COLUMN)75(COLUMN)50 Monterrey(COLUMN)cloudy(COLUMN)80(COLUMN)50 Montreal(COLUMN)snow(COLUMN)16(COLUMN)10 Nassau(COLUMN)fair(COLUMN)85(COLUMN)72 Ottawa(COLUMN)snow(COLUMN)12(COLUMN)7 Regina(COLUMN)snow(COLUMN)10(COLUMN)-6 St. Kitts(COLUMN)pt. cldy(COLUMN)87(COLUMN)74 Toronto(COLUMN)snow(COLUMN)23(COLUMN)16 Vancouver(COLUMN)cloudy(COLUMN)41(COLUMN)39 Vera Cruz(COLUMN)pt. cldy(COLUMN)89(COLUMN)70 Winnipeg(COLUMN)snow(COLUMN)14(COLUMN)22(END TABLE)