Washington: Today - Cloudy and mild, high 67 to 72, low 47 to 52. The chance of precipitation is 20 percent today, 40 percent tonight. Wednesday - Chance of rain, high around 60.

Maryland and Virginia: Today - Cloudy and mild, high around 70, low in the 40s. Wednesday - Variable cloudiness, chance of showers, high in the 50s.

West Virginia: Rain, high in the 50s and 60s, low in the 40s.

Lower Potomac and Chesapeake Bay: Partly cloudy, chance of showers. Winds southerly 15 to 25 knots. Waves will increase to 2 to 4 feet. Visibility will be fair to poor at times.

Extended Area Outlook for Thursday through Saturday: Partly cloudy with little or no precipitation. Highs will average in the 50s and lows in the 30s. Normal Washington temperatures for the period are a high of 56 and a low of 38.

Almanac Data for today: Sun rises 6:11 a.m., sets 6:21 p.m.; moon rises 3:36 p.m., sets 4:19 a.m. Tides: High 5:38 a.m. and 6 p.m., low 12:04 a.m. and 12:27 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 3/4); Norfolk (1); Virginia Beach (3/4); Solomons Island (6 1/4); Point Lookout (7). National Weather Summary for yesterday: Mild weather previaled over much of the southern half of the country. The vast majority of the nation was above freezing except for some extreme northern areas from Montana to Maine. A weather system moving across North Dakota into the upper Mississippi Valley spread snow into northern Minnesota. Rainshowers and thunderstorms ranged across Oklahoma and southern Kansas into southern Missouri and northern Arkansas. Rain was reported along the Gulf Coast from eastern Texas to Mississippi. Melting snow and ice jams continued to produce high water along rivers in parts of the plains and Mississippi Valley.

The National weather forecast for today: Rain will cover much of the country from the lower MIssissippi Valley to the central Great Lakes and eastward to the Atlantic from South Carolina through New England with snow in extreme northern New England. Thunderstorms are likely from the lower Mississippi Valley into the Tennessee Valley area. Showers are also likely from California and southern Oregon into the plateau region. Sunny or partly sunny skies are in store for a large part of the rest of the U.S. Temperatures will be cool over the southern half of California and the Great Basin, North Dakota, the upper Mississippi Valley and the Great Lakes areas, and through the north Atlantic coast states. Most of the remainder of the country can expect mild conditions.

The Council of Goernments' Air Quality Index for yesterday showed the high reading in the Washington area during the 2-3 p.m. period was 38 for the pollutant, photochemical oxidants. Index value 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 be fair.

The National Weather Service forecasts the Potomac River stage at Little Falls should be near 6.5 feet today. Stages over 5 feet are considered hazardous for recreational activities.

Washington data at 7 p.m. (EST) yesterday: Highest temperature since 7 a.m. yesterday, 61 degrees at 3:30 p.m. Lowest temperature since midnight, 41 degrees at 4:25 a.m. Deficiency of temperature since Mar. 1, 61 degrees. Deficiency of temperature since Jan. 1, 308 degrees. Record high temperature for today, 89 degrees in 1921. Record low temperature for today, 10 degrees in 1885. Relative humidity: Maximum, 55 percent at 7 a.m. Minimum, 31 percent at 3 p.m. 24-hour precipitation, none. Deficiency of precipitation since Mar. 1, .61 inches. Excess of precipitation since Jan. 1, 1.85 inches. Highest observed wind since 7 a.m., 21 miles per hour from the southeast at 5:29 p.m. Local Temp., Humidity(TABLE) Time(COLUMN)T.(COLUMN)H. 12 midnight(COLUMN)49(COLUMN)33 1 a.m.(COLUMN)46(COLUMN)37 2 a.m.(COLUMN)45(COLUMN)38 3 a.m.(COLUMN)44(COLUMN)41 4 a.m.(COLUMN)44(COLUMN)40 5 a.m.(COLUMN)41(COLUMN)45 6 a.m.(COLUMN)41(COLUMN)49 7 a.m.(COLUMN)41(COLUMN)55 8 a.m.(COLUMN)45(COLUMN)49 9 a.m.(COLUMN)48(COLUMN)46 10 a.m.(COLUMN)50(COLUMN)39 11 a.m.(COLUMN)51(COLUMN)38 12 noon(COLUMN)54(COLUMN)35 1 p.m.(COLUMN)56(COLUMN)35 2 p.m.(COLUMN)57(COLUMN)33 3 p.m.(COLUMN)59(COLUMN)31 4 p.m.(COLUMN)59(COLUMN)32 5 p.m.(COLUMN)56(COLUMN)31 6 p.m.(COLUMN)53(COLUMN)38 7 p.m.(COLUMN)51(COLUMN)35(END TABLE) Temperatures ending 7 a.m. (EST) yesterday:(TABLE) City(COLUMN)H.(COLUMN)L. Albany(COLUMN)50(COLUMN)25 Aubuqueroue(COLUMN)73(COLUMN)37 Amarillo(COLUMN)61(COLUMN)40 Anchorage(COLUMN)35(COLUMN)31 Asheville(COLUMN)76(COLUMN)33 Atlanta(COLUMN)77(COLUMN)47 Atlantic City(COLUMN)56(COLUMN)36 Austin(COLUMN)80(COLUMN)63 Baltimore(COLUMN)70(COLUMN)30 Billings(COLUMN)55(COLUMN)32 Birmingham(COLUMN)74(COLUMN)50 Biamarck(COLUMN)39(COLUMN)35 Bolse(COLUMN)70(COLUMN)34 Boston(COLUMN)50(COLUMN)31 Brownsville(COLUMN)81(COLUMN)62 Buffalo(COLUMN)47(COLUMN)24 Burlington, Vt.(COLUMN)43(COLUMN)18 Casper(COLUMN)60(COLUMN)37 Charleston, S.C.(COLUMN)63(COLUMN)51 Cha'ltn , W. Va.(COLUMN)67(COLUMN)32 Charlotte, N.C.(COLUMN)75(COLUMN)41 Chevenne(COLUMN)58(COLUMN)41 Chicago(COLUMN)47(COLUMN)30 Cincinnati(COLUMN)56(COLUMN)31 Cleveland(COLUMN)48(COLUMN)25 Columbia, S.C.(COLUMN)76(COLUMN)46 Columbus, Ohio(COLUMN)47(COLUMN)24 Dal.-Ft. Worth(COLUMN)80(COLUMN)60 Dayton(COLUMN)47(COLUMN)28 Denver(COLUMN)65(COLUMN)50 Des Moines(COLUMN)45(COLUMN)31 Detroit(COLUMN)45(COLUMN)25 Duluth(COLUMN)36(COLUMN)26 El Paso(COLUMN)79(COLUMN)44 Fairbanks(COLUMN)23(COLUMN)16 Fargo(COLUMN)34(COLUMN)31 Flagstaff(COLUMN)62(COLUMN)29 Great Falls(COLUMN)63(COLUMN)31 Hartford(COLUMN)52(COLUMN)31 Helena(COLUMN)62(COLUMN)36 Honolulu(COLUMN)81(COLUMN)72 Houston(COLUMN)72(COLUMN)60 Indianapolis(COLUMN)50(COLUMN)33 Jackson, Miss.(COLUMN)77(COLUMN)50 Jacksonville(COLUMN)68(COLUMN)44 Juneau(COLUMN)42(COLUMN)35 Kansas City(COLUMN)53(COLUMN)34 Las Vegas(COLUMN)79(COLUMN)55 Little Rock(COLUMN)76(COLUMN)57 Los Angeles(COLUMN)73(COLUMN)60 Louisville(COLUMN)65(COLUMN)38 Memphis(COLUMN)74(COLUMN)58 Miami Beach(COLUMN)71(COLUMN)69 Midland-Odessa(COLUMN)87(COLUMN)54 Milwaukee(COLUMN)43(COLUMN)26 Mols.-St, Paul(COLUMN)40(COLUMN)29 Nashville(COLUMN)77(COLUMN)44 New Orleans(COLUMN)74(COLUMN)51 New York(COLUMN)57(COLUMN)34 Norfolk(COLUMN)72(COLUMN)45 North Platte(COLUMN)55(COLUMN)31 Oklahoma City(COLUMN)76(COLUMN)54 Omaha(COLUMN)47(COLUMN)32 Orland(COLUMN)74(COLUMN)54 Philadelphia(COLUMN)61(COLUMN)33 Phoenix(COLUMN)85(COLUMN)61 Pittsburgh(COLUMN)50(COLUMN)26 Portland, Ma.(COLUMN)49(COLUMN)21 Portland, Ore.(COLUMN)70(COLUMN)42 Providence(COLUMN)49(COLUMN)30 Raleigh(COLUMN)74(COLUMN)41 Rapid City(COLUMN)55(COLUMN)41 Reno(COLUMN)69(COLUMN)33 Richmond(COLUMN)78(COLUMN)47 St. Louis(COLUMN)56(COLUMN)35 St. Prog.-Tamoa(COLUMN)73(COLUMN)52 Salt Lake City(COLUMN)66(COLUMN)46 San Antonio(COLUMN)80(COLUMN)62 San Diego(COLUMN)71(COLUMN)63 San Francisco(COLUMN)67(COLUMN)56 San Juan(COLUMN)84(COLUMN)73 St. Sta. Marie(COLUMN)33(COLUMN)4 Seattle(COLUMN)59(COLUMN)43 Sjoux Falls(COLUMN)44(COLUMN)34 Spokane(COLUMN)61(COLUMN)35 Syracuse(COLUMN)42(COLUMN)23 Topaka(COLUMN)56(COLUMN)30 Tucson(COLUMN)82(COLUMN)56 Tulsa(COLUMN)74(COLUMN)57 Washington(COLUMN)74(COLUMN)41 Wichita(COLUMN)63(COLUMN)41(END TABLE) Temperatures Abroad Yesterday(TABLE) CIty(COLUMN)Weather(COLUMN)Time(COLUMN)Temp. Aberdeen(COLUMN)pt.cldy.(COLUMN)1 p.m.(COLUMN)45 Amsterdam(COLUMN)cloudy(COLUMN)1 p.m.(COLUMN)45 Ankara(COLUMN)cloudy(COLUMN)3 p.m.(COLUMN)59 Athens(COLUMN)pt.cldy.(COLUMN)2 p.m.(COLUMN)59 Auckland(COLUMN)clear(COLUMN)mdnt.(COLUMN)57 Berlin(COLUMN)pt.cldy.(COLUMN)1 p.m.(COLUMN)39 Birmingham(COLUMN)cloudy(COLUMN)1 p.m.(COLUMN)22 Brussels(COLUMN)cloudy(COLUMN)1 p.m.(COLUMN)46 Cassablanca(COLUMN)clear(COLUMN)noon(COLUMN)63 Copenhagen(COLUMN)snow(COLUMN)1 p.m.(COLUMN)20 Dublin(COLUMN)rain(COLUMN)1 p.m.(COLUMN)43 Geneva(COLUMN)rain(COLUMN)1 p.m.(COLUMN)41 Hong Kong(COLUMN)cloudy(COLUMN)8 p.m.(COLUMN)64 London(COLUMN)rain(COLUMN)1 p.m.(COLUMN)46 Madrid(COLUMN)cloudy(COLUMN)1 p.m.(COLUMN)57 Malta(COLUMN)clear(COLUMN)1 p.m.(COLUMN)59 Manila(COLUMN)clear(COLUMN)8 p.m.(COLUMN)84 Moscow(COLUMN)cloudy(COLUMN)3 p.m.(COLUMN)31 New Delhi(COLUMN)clear(COLUMN)5 p.m.(COLUMN)77 Nice(COLUMN)pt.cldy.(COLUMN)1 p.m.(COLUMN)57 Oslo(COLUMN)clear(COLUMN)1 p.m.(COLUMN)25 Paris(COLUMN)rain(COLUMN)1 p.m.(COLUMN)41 Peking(COLUMN)smoke(COLUMN)8 p.m.(COLUMN)46 Rome(COLUMN)cloudy(COLUMN)1 p.m.(COLUMN)57 Saigon(COLUMN)clear(COLUMN)8 p.m.(COLUMN)84 Sofia(COLUMN)pt.cldy.(COLUMN)2 p.m.(COLUMN)39 Stockholm(COLUMN)snow(COLUMN)1 p.m.(COLUMN)23 Sydney(COLUMN)cloudy(COLUMN)10 p.m.(COLUMN)75 Tel Aviv(COLUMN)clear(COLUMN)2 p.m.(COLUMN)77 Tokyo(COLUMN)clear(COLUMN)9 p.m.(COLUMN)52 Tunis(COLUMN)pt.cldy.(COLUMN)1 p.m.(COLUMN)47 Vienna(COLUMN)cloudy(COLUMN)1 p.m.(COLUMN)45 Warsaw(COLUMN)cloudy(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)71 Barbados(COLUMN)fair(COLUMN)85(COLUMN)77 Bermudas(COLUMN)fair(COLUMN)63(COLUMN)57 Bogota(COLUMN)pt.cldy.(COLUMN)68(COLUMN)57 Calgary(COLUMN)pt.cldy.(COLUMN)41(COLUMN)30 Edmonton(COLUMN)cloudy(COLUMN)43(COLUMN)30 Havana(COLUMN)pt.cldy.(COLUMN)75(COLUMN)64 Kingston(COLUMN)fair(COLUMN)90(COLUMN)71 Montego Bay(COLUMN)cloudy(COLUMN)81(COLUMN)73 Mexico City(COLUMN)haze(COLUMN)70(COLUMN)50 Monterrey(COLUMN)clear(COLUMN)81(COLUMN)51 Nassau(COLUMN)cloudy(COLUMN)73(COLUMN)62 Regina(COLUMN)cloudy(COLUMN)36(COLUMN)27 Toronto(COLUMN)pt.cldy.(COLUMN)37(COLUMN)14 Vancouver(COLUMN)cloudy(COLUMN)52(COLUMN)41 Veracruz(COLUMN)pt.cldy.(COLUMN)77(COLUMN)66 Winnipeg(COLUMN)snow(COLUMN)30(COLUMN)27(END TABLE)