Washington: Today -- Sunny with diminishing winds, high mid 30s, low around 20. Chance of snow is near zero through tonight. Winds will be from the northwest at 15 to 20 mph.Saturday -- Increasing cloudiness, high in upper 30s.

Maryland and Virginia: Today -- Sunny with diminishing winds, highs from mid to upper 30s, lows near 20. Saturday -- Increasing cloudiness, highs from mid to upper 30s.

West Virginia: Today -- Partly sunny with chance of snow by late evening to the south, highs from low 20s to low 30, lows in the teens. Saturday -- Occasional snow, highs from mid 2/s to mid 30s.

Extended Area Forecast for Sunday through Tuesday -- Very cold during the period with a chance of snow on Sunday, fair on Monday and Tuesday. Highs will be in the low to mid 20s, lows in the low teens.

Lower Potomac and Chesapeake Bay: Today -- Fair with diminishing winds. Visibility will be good. Winds will be from the northwest at 12 to 20 knots. Waves will subside to between 1 and 2 feet.

The Nation Yesterday: Snow diminished over the Southwest and the Rockies yesterday afternoon. Other precipitation in the Southwest included a few showers and isolated thundershowers over southern California and southern Arizona. Gusty winds and snow plagued much of the Northeast during the afternoon, but by evening the area of snow diminished and reached from northwestern New England over the upper Ohio Valley into West Virginia. By evening snow squalls continued near the Great Lakes inwestern New York. Both Rochester and Buffalo had snow increasing an inch an hour. There were scattered areas of light snow over parts of upper Michigan, South Dakota, Minnesota and lowa. The gusty winds over the northeast diminished. It was a very cold day for the beginning of the 2nd month of 1979. Afternoon temperatures were just above or below zero mark from North Dakota across Montana. It was not warm anywhere with temperatures just above the freezing mark reaching as far as the northern portions of the Gulf Coast states.

The National Weather Forecast for Today -- Snow will fall across the Rockies and the south and central intermountain region. Snow will also reach from the upper Great Lakes region and the northern half of the Mississippi Valley across the lower Ohio Valley. Snow fulrries will continue from northern New England and through western New York with local snow squalls near the Great Lakes. South Texas will have rain and drizzle. Elsewhere, except for sunny or fair skies over the South and Mid Atlantic Coast states, skies will be cloudy or partly cloudy. It will be very cold across the northern half of both the Rockies and the Great Plains and the Middle Mississippi and the Ohio Valley. The remainder of the nation will be cold.

Almanac Data for today: The sun rises 7:14 a.m., sets 5:31 p.m.; the moon rises 10:39 a.m., sets 11:57 p.m. Tides: high 11:55 a.m., low 6:32 a.m and 7:09 pm 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 1/2), Solomons Island (6 1/4), Point Lookout (7).

The Council of Governments' Air Quality Index for yesterday showed the high reading in the Washington area duriing the 3 p.m. period was 26 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 Falls should fall to 4.5 feet today.

Washington data for yesterday: Highest temperature since midnight yesterday, 35 degrees at 2:45 p.m. Lowest temperature since midnight, 27 degrees at 7:59 p.m. Deficiency of temperature since Feb. 1, 4 degrees. Deficiency of temperature since Jan. 1, 11 degrees. Record high temperature for today, 71 degrees in 1967. Record low temperature for today, 02 degrees in 1904. Relative humidity: maximum, 51 percent at 4:00 a.m.; minimum, 35 percent at 3:00 p.m. 24 hour precipitation, 00 inches. Deficiency of precipitation since Feb. 1,.08 inches. Excess of precipitation since Jan. 1, 3.94 inches. Highest observed wind since 7 a.m., 36 miles per hour from the northwest at 11:00 a.m. Peak gust since 7 a.m., 53 miles per hour from the northwest at 9:14 a.m. Local Temp., Humidity (TABLE) Time(COLUMN)T.(COLUMN)H. 12 midnite(COLUMN)32(COLUMN)47 1 a.m.(COLUMN)32(COLUMN)49 2 a.m.(COLUMN)32(COLUMN)49 3 a.m.(COLUMN)32(COLUMN)49 4 a.m.(COLUMN)33(COLUMN)35 5 a.m.(COLUMN)30(COLUMN)47 6 a.m.(COLUMN)28(COLUMN)46 7 a.m.(COLUMN)28(COLUMN)46 8 a.m.(COLUMN)30(COLUMN)43 9 a.m.(COLUMN)30(COLUMN)45 10 a.m.(COLUMN)32(COLUMN)40 11 a.m.(COLUMN)32(COLUMN)40 12 noon(COLUMN)32(COLUMN)38 1 p.m.(COLUMN)33(COLUMN)36 2 p.m.(COLUMN)32(COLUMN)36 3 p.m.(COLUMN)33(COLUMN)35 4 p.m.(COLUMN)33(COLUMN)35 5 p.m.(COLUMN)32(COLUMN)36 6 p.m.(COLUMN)29(COLUMN)41 7 p.m.(COLUMN)28(COLUMN)42(END TABLE) Temperatures ending 7 p.m. (EST) yesterday: (TABLE) City(COLUMN)L.(COLUMN)H. Albany(COLUMN)11(COLUMN)16 Albuquerque(COLUMN)18(COLUMN)49 Amarillo(COLUMN)17(COLUMN)53 Anchorage(COLUMN)25(COLUMN)27 Asheville(COLUMN)14(COLUMN)26 Atlanta(COLUMN)17(COLUMN)35 Atlantic City(COLUMN)26(COLUMN)32 Austin(COLUMN)28(COLUMN)43 Baltimore(COLUMN)26$'33 Billings(COLUMN)-30(COLUMN)00 Birmingham(COLUMN)16(COLUMN)35 Bismark(COLUMN)-30(COLUMN)00 Boise(COLUMN)04(COLUMN)16 Boston(COLUMN)23(COLUMN)30 Brownsville(COLUMN)46(COLUMN)66 Buffalo(COLUMN)13(COLUMN)18 Burlington(COLUMN)00(COLUMN)20 Casper(COLUMN)00(COLUMN)20 Charleston, S.C.(COLUMN)28(COLUMN)44 Char'ton, W.V.(COLUMN)14(COLUMN)23 Charlotte(COLUMN)13(COLUMN)39 Chlyenne(COLUMN)07(COLUMN)35 Chicago(COLUMN)03(COLUMN)18 Cincinnati(COLUMN)06(COLUMN)20 Cleveland(COLUMN)15(COLUMN)22 Columbia(COLUMN)26(COLUMN)49 Columbus(COLUMN)09(COLUMN)20 Dal.-Ft. Worth(COLUMN)20(COLUMN)41 Dayton(COLUMN)08(COLUMN)18 Denver(COLUMN)-03(COLUMN)39 Des Moines(COLUMN)-14(COLUMN)09 Detroit(COLUMN)12(COLUMN)24 Duluth(COLUMN)02(COLUMN)13 El Paso(COLUMN)24(COLUMN)55 Fairbanks(COLUMN)-23(COLUMN)-02 Fargo(COLUMN)-16(COLUMN)01 Flagstaff(COLUMN)21(COLUMN)26 Great Falls(COLUMN)-06(COLUMN)02 Hartford(COLUMN)16(COLUMN)-20 Helena(COLUMN)-14(COLUMN)06 Honolulu(COLUMN)80(COLUMN)65 Houston(COLUMN)32(COLUMN)42 Indianapolis(COLUMN)-04(COLUMN)15 Jackson, Miss.(COLUMN)20(COLUMN)38 Jacksonville(COLUMN)30(COLUMN)49 Juneau(COLUMN)17(COLUMN)28 Kansas City(COLUMN)-12(COLUMN)18 Las Vegas(COLUMN)29(COLUMN)46 Little Rock(COLUMN)12(COLUMN)29 Los Angeles(COLUMN)44(COLUMN)56 Louisville(COLUMN)07(COLUMN)22 Memphis(COLUMN)16(COLUMN)32 Miami Beach(COLUMN)42(COLUMN)60 Midlnd.-Odessa(COLUMN)20(COLUMN)51 Milwaukee(COLUMN)10(COLUMN)19 Mpls.-St. Paul(COLUMN)-09(COLUMN)10 Nashville(COLUMN)09(COLUMN)28 New Orleans(COLUMN)31(COLUMN)43 New York(COLUMN)23(COLUMN)30 Norfolk(COLUMN)26(COLUMN)39 North Platte(COLUMN)-19(COLUMN)06 Oklahoma City(COLUMN)09(COLUMN)35 Omaha(COLUMN)-11(COLUMN)11 Orlando(COLUMN)33(COLUMN)55 Philadelphia(COLUMN)23(COLUMN)29 Phoenix(COLUMN)46(COLUMN)61 Pittsburgh(COLUMN)14(COLUMN)19 Po'tland, Maine(COLUMN)25(COLUMN)31 Portland, Ore.(COLUMN)19(COLUMN)33 Providence(COLUMN)19(COLUMN)25 Raleigh(COLUMN)22(COLUMN)42 Rapid City(COLUMN)-09(COLUMN)06 Reno(COLUMN)19(COLUMN)35 Richmond(COLUMN)25(COLUMN)40 St. Louis(COLUMN)-04(COLUMN)17 St. Prbg.-Ta'pa(COLUMN)37(COLUMN)53 Salt Lake City(COLUMN)10(COLUMN)25 San Antonio(COLUMN)29(COLUMN)45 San Diego(COLUMN)49(COLUMN)59 San Francisco(COLUMN)43(COLUMN)52 San Juan(COLUMN)71(COLUMN)86 St. Ste. Marie(COLUMN)03(COLUMN)15 Seattle(COLUMN)25(COLUMN)40 Shreveport(COLUMN)22(COLUMN)42 Sioux Falls(COLUMN)-26(COLUMN)07 Spokane(COLUMN)-13(COLUMN)03 Syracuse(COLUMN)12(COLUMN)16 Topeka(COLUMN)-23(COLUMN)20 Tucson(COLUMN)47(COLUMN)60 Tulsa(COLUMN)-07(COLUMN)29 Washingto(COLUMN)28(COLUMN)35 Wichita(COLUMN)-07(COLUMN)27(END TABLE) Temperatures Abroad Yesterday (TABLE) City(COLUMN)Weather(COLUMN)time(COLUMN)temp. Aberdeen(COLUMN)Clear,h1 p.m.(COLUMN)32 Amsterdam(COLUMN)Rain(COLUMN)1 p.m.(COLUMN)36 Ankara(COLUMN)Rain(COLUMN)3 p.m.(COLUMN)39 Athens(COLUMN)pt. cldy(COLUMN)2 p.m.(COLUMN)55 Auckland(COLUMN)pt. cldy(COLUMN)midnight(COLUMN)64 Berlin(COLUMN)cloudy(COLUMN)1 p.m.(COLUMN)37 Birmingham(COLUMN)rain(COLUMN)1 p.m.(COLUMN)37 Bonn(COLUMN)cloudy(COLUMN)1 p.m.(COLUMN)37 Brussels(COLUMN)cloudy(COLUMN)1 p.m.(COLUMN)36 Casablanca(COLUMN)pt. cldy(COLUMN)noon(COLUMN)68 Copenhagen(COLUMN)rain(COLUMN)1 p.m.(COLUMN)34 Dublin(COLUMN)rain(COLUMN)1 p.m.(COLUMN)37 Geneva(COLUMN)pt. cldy(COLUMN)1 p.m.(COLUMN)30 Hong Kong(COLUMN)p. cldy(COLUMN)8 p.m.(COLUMN)54 Jerusalem(COLUMN)cloudy(COLUMN)2 p.m.(COLUMN)61 Lisbon(COLUMN)rain(COLUMN)noon(COLUMN)59 London(COLUMN)rain(COLUMN)1 p.m.(COLUMN)43 Madrid(COLUMN)cloudy(COLUMN)1 p.m.(COLUMN)41 Malta(COLUMN)pt. cldy(COLUMN)1 p.m.(COLUMN)59 Manila(COLUMN)clear(COLUMN)8 p.m.(COLUMN)81 Moscow(COLUMN)cloudy(COLUMN)3 p.m.(COLUMN)27 New Delhi(COLUMN)clear(COLUMN)5 p.m.(COLUMN)64 Nice(COLUMN)cloudy(COLUMN)1 p.m.(COLUMN)54 Oslo(COLUMN)snow(COLUMN)1 p.m.(COLUMN)18 Paris(COLUMN)rain(COLUMN)1 p.m.(COLUMN)36 Peking(COLUMN)pt. cldy(COLUMN)8 p.m.(COLUMN)16 Rome(COLUMN)pt. cldy(COLUMN)1 p.m.(COLUMN)55 Saigon(COLUMN)pt. cldy(COLUMN)8 p.m.(COLUMN)82 Sofia(COLUMN)clear(COLUMN)2 p.m.(COLUMN)37 Stockholm(COLUMN)clear(COLUMN)1 p.m.(COLUMN)19 Sydney(COLUMN)clear(COLUMN)10 p.m.(COLUMN)75 Tokyo(COLUMN)clear(COLUMN)9 p.m.(COLUMN)54 Tunis(COLUMN)pt. cldy(COLUMN)1 p.m.(COLUMN)57 Vienna(COLUMN)clear(COLUMN)1 p.m.(COLUMN)43 Warsaw(COLUMN)snow(COLUMN)1 p.m.(COLUMN)34(END TABLE) Temperatures (Western Hemisphere) (TABLE) City(COLUMN)Weather(COLUMN)High(COLUMN)Low Acapulco(COLUMN)clear(COLUMN)86(COLUMN)72 Barbados(COLUMN)pt. cldy(COLUMN)82(COLUMN)70 Bermuda(COLUMN)rain(COLUMN)69(COLUMN)61 Bogota(COLUMN)pt. cldy(COLUMN)66(COLUMN)43 Calgary(COLUMN)snow(COLUMN)07(COLUMN)-22 Culiacan(COLUMN)cloudy(COLUMN)75(COLUMN)55 Edmonton(COLUMN)clear(COLUMN)05(COLUMN)-27 Havana(COLUMN)pt. cldy(COLUMN)82(COLUMN)64 Kingston(COLUMN)clear(COLUMN)88(COLUMN)73 Montego Bay(COLUMN)pt. cldy(COLUMN)84(COLUMN)72 Mexico City (COLUMN)haxe(COLUMN)77(COLUMN)45 Monterrey(COLUMN)haze(COLUMN)48(COLUMN)41 Montreal(COLUMN)snow(COLUMN)19(COLUMN)10 Nassau(COLUMN)pt. cldy(COLUMN)75(COLUMN)63 Regina(COLUMN)snow(COLUMN)-02(COLUMN)-17 St. Kitts(COLUMN)fair(COLUMN)85(COLUMN)70 Toronto(COLUMN)snow(COLUMN)21(COLUMN)12 Veracruz(COLUMN)cloudy(COLUMN)70(COLUMN)61 Winnipeg(COLUMN)snow(COLUMN)00(COLUMN)-15(END TABLE)