Washington: Today - Cloudy, rains or snow likely, high between 35 and 40, low 33 to 35. The chance of precipitation is 50 percent today. 40 percent tonight. Thursday - Chance of rain, high around 40.

Maryland and Virginia: Today - Cloudy, chance of snow or rain. High in the 30s, low in the low or mid 20s. Thursday - Chance of rain, high near 40, low in the 30s.

Lower Potomac and Chesapeake Bay: Chance of rain, visibility poor, winds northeast 20 to 25 knots. Waves in ice-free waters will be up to 2 feet.

Extended Aea Forecast for Friday through Sunday: Chance of rain Friday, otherwise fair. Highs will be in the 50s, lows mostly in the 30s. Normal Washington temperatures for the period are a high of 53 and a low of 34.

West Virginia: Today - Snow or mixed snow and rain, highs near 40.

The National Weather Forecast for today - Snow will extend from the central Appalachians across Pennsylvania and New Jersey. Rain will reach through central Florida, across the upper Ohio Valley and southeast through the lower Mississippi Valley. Rain will spread over much of the Pacific Coast and across the upper half of the intermountain region into the upper Missouri Valley, changing to snow in the higher elevations. Temperatures will be mild from the northern plains to the pacific northwest, through the Rockies and the Southwest. The remainder of the nation will continue cool and cold.

Almanac Data for today: Sun rises 6:31 a.m., sets 6:08 p.m. Moon rises 6:04 a.m., sets 5:55 p.m. Tides: high 7:30 a.m., and 7:57 p.m., low 1:43 a.m. and 2:08 p.m. High and low tides at the following locations may be obtained by subtracting the hours indicated from the hours above:

Annapols (1 1/2); Bloody Point Light-house (4 1/2); Deale, Md., (4 1/2); Colonial Beach (6); Norfolk (1 1/2); Virginia Beach (1); Solomons Island (6 1/2); Point Lookout (7).

The Council of Governments' Air Quality Index for yesterday showed the high reading in the Washington area curlling the 2-3 p.m. period was 30 for the pollutant, photo-chemical oxidants. Index values between 25 and 49 indicates fair air quality. When the index exceeds 400 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 to good.

Washington data at 7 p.m. (EST) yesterday: Highest temperature since 7 p.m. yesterday, 38 degrees at 2:20 p.m. Lowest temperature since midnight, 30 degrees at 4:25 a.m. Deficiency of temperature since March 1, 72 degrees. Deficiency of temperature since Jan. 1, 319 degrees. Record high temperature for today, 77 degrees in 1921. Record low temperature for today, 14 degrees in 1883. Relative humidity: Maximum, 53 per cent at 7 a.m.; Minimum, 31 per cent at 2 p.m. 24 hour precipitation, none. Deficiency of precipitation since March 1, 0.23 inches. Excess of precipitation since Jan. 1, 2.23 inches. Highest observed wind since 7 a.m. 14 miles per hour from the north-northeast at 8 a.m. Local Temp., Humidity(TABLE) Time(COLUMN)T.(COLUMN)H. 12 mid.(COLUMN)35(COLUMN)48 1 a.m.(COLUMN)34(COLUMN)50 2 a.m.(COLUMN)33(COLUMN)48 3 a.m.(COLUMN)31(COLUMN)49 4 a.m.(COLUMN)31(COLUMN)49 5 a.m.(COLUMN)30(COLUMN)53 6 a.m.(COLUMN)31(COLUMN)51 7 a.m.(COLUMN)30(COLUMN)53 8 a.m.(COLUMN)33(COLUMN)43 9 a.m.(COLUMN)33(COLUMN)43 10 a.m.(COLUMN)34(COLUMN)40 11 a.m.(COLUMN)35(COLUMN)37 12 noon(COLUMN)36(COLUMN)35 1 p.m.(COLUMN)37(COLUMN)35 2 p.m.(COLUMN)37(COLUMN)31 3 p.m.(COLUMN)38(COLUMN)32 4 p.m.(COLUMN)38(COLUMN)31 5 p.m.(COLUMN)37(COLUMN)35 6 p.m.(COLUMN)37(COLUMN)39 7 p.m.(COLUMN)36(COLUMN)42(END TABLE) Temperatures ending 7 a.m. (EST) yesterday:(TABLE) City(COLUMN)H.(COLUMN)L. Albany(COLUMN)30(COLUMN)14 Albuquerque(COLUMN)60(COLUMN)41 Amarillo(COLUMN)61(COLUMN)30 Anchorage(COLUMN)31(COLUMN)24 Ashville(COLUMN)62(COLUMN)29 Atlanta(COLUMN)66(COLUMN)38 Atlantic City(COLUMN)35(COLUMN)25 Austin(COLUMN)63(COLUMN)47 Baltimore(COLUMN)37(COLUMN)23 Billings(COLUMN)33(COLUMN)23 Birmingham(COLUMN)56(COLUMN)39 Bismark(COLUMN)15(COLUMN)15 Boise(COLUMN)53(COLUMN)39 Boston(COLUMN)35(COLUMN)25 Brownsville(COLUMN)75(COLUMN)65 Buffalo(COLUMN)23(COLUMN)08 Burlington, Vt.(COLUMN)21(COLUMN)01 Casper(COLUMN)47(COLUMN)27 Charleston, S.C.(COLUMN)62(COLUMN)43 Charleston, W.V.(COLUMN)48(COLUMN)33 Charlotte, N.C.(COLUMN)60(COLUMN)40 Chevenne(COLUMN)46(COLUMN)29 Cheyenne(COLUMN)46(COLUMN)29 Chicago(COLUMN)31(COLUMN)24 Cincinnati(COLUMN)42(COLUMN)30 Cleveland(COLUMN)33(COLUMN)03 Columbia, S.C.(COLUMN)65(COLUMN)29 Columbus, Ohio(COLUMN)38(COLUMN)23 Dal.-Ft. Worth(COLUMN)63(COLUMN)52 Dayton(COLUMN)40(COLUMN)24 Denver(COLUMN)56(COLUMN)34 Des Molnes(COLUMN)32(COLUMN)24 Detroit(COLUMN)32(COLUMN)05 Duluth(COLUMN)31(COLUMN)-4 El Paso(COLUMN)65(COLUMN)37 Fairbanks(COLUMN)12(COLUMN)00 Fargo(COLUMN)15(COLUMN)00 Flagstaff(COLUMN)52(COLUMN)26 Great Falls(COLUMN)37(COLUMN)15 Hartford(COLUMN)34(COLUMN)30 Helena(COLUMN)47(COLUMN)21 Honolulu(COLUMN)80(COLUMN)68 Houston(COLUMN)67(COLUMN)60 Indianapolis(COLUMN)41(COLUMN)60 Jackson, Miss.(COLUMN)70(COLUMN)52 Jacksonville(COLUMN)69(COLUMN)40 Juneau(COLUMN)39(COLUMN)33 Kansas City(COLUMN)38(COLUMN)31 Las Vegas(COLUMN)69(COLUMN)45 Little Rock(COLUMN)51(COLUMN)47 Los Angeles(COLUMN)68(COLUMN)53 Lousiville(COLUMN)50(COLUMN)33 Memphis(COLUMN)56(COLUMN)52 Miami Beach(COLUMN)72(COLUMN)70 Midland-Odessa(COLUMN)73(COLUMN)42 Milwaukee(COLUMN)27(COLUMN)15 Mpls-St. Paul(COLUMN)28(COLUMN)-4 Nashville(COLUMN)57(COLUMN)46 New Orleans(COLUMN)70(COLUMN)58 New York(COLUMN)33(COLUMN)20 Norfolk(COLUMN)42(COLUMN)28 North Platte(COLUMN)27(COLUMN)21 Oklahoma City(COLUMN)67(COLUMN)36 Omaha(COLUMN)35(COLUMN)22 Orlando(COLUMN)75(COLUMN)51 Philadelphia(COLUMN)32(COLUMN)17 Phoenix(COLUMN)67(COLUMN)51 Pittsburgh, Maine(COLUMN)32(COLUMN)05 Portland, Ore.(COLUMN)56(COLUMN)45 Providence(COLUMN)33(COLUMN)19 Raleigh(COLUMN)59(COLUMN)36 Rapid City(COLUMN)22(COLUMN)20 Reno(COLUMN)58(COLUMN)34 Richmond(COLUMN)44(COLUMN)26 St. Louis(COLUMN)39(COLUMN)33 St. Prbg. Tampa(COLUMN)71(COLUMN)53 Salt Lake City(COLUMN)50(COLUMN)32 San Antonio(COLUMN)69(COLUMN)46 San Diego(COLUMN)68(COLUMN)56 San Francisco(COLUMN)64(COLUMN)54 San Juan(COLUMN)26(COLUMN)74 St. Ste. Marie(COLUMN)25(COLUMN)-1 Seattle(COLUMN)55(COLUMN)46 Shreveport(COLUMN)66(COLUMN)52 Sioux Falls(COLUMN)24(COLUMN)20 Spokane(COLUMN)43(COLUMN)35 Syracuse(COLUMN)28(COLUMN)03 Topeka(COLUMN)41(COLUMN)32 Tucson(COLUMN)61(COLUMN)45 Tulsa(COLUMN)64(COLUMN)40 Washington(COLUMN)39(COLUMN)30 Wichita(COLUMN)54(COLUMN)32(END TABLE) Temperatures Abroad Yesterday(TABLE) City(COLUMN)Weather(COLUMN)Time(COLUMN)Temp Aberdeen(COLUMN)haze(COLUMN)1 p.m.(COLUMN)48 Amsterdam(COLUMN)pt. cldy.(COLUMN)1 p.m.(COLUMN)45 Ankara(COLUMN)cloudy(COLUMN)3 p.m.(COLUMN)64 Athens(COLUMN)cloudy(COLUMN)2 p.m.(COLUMN)63 Berlin(COLUMN)cloudy(COLUMN)1 p.m.(COLUMN)43 Birmingham(COLUMN)cloudy(COLUMN)1 p.m.(COLUMN)48 Brussels(COLUMN)clear(COLUMN)1 p.m.(COLUMN)45 Casablance(COLUMN)clear(COLUMN)noon(COLUMN)61 Copenhagen(COLUMN)clear(COLUMN)1 p.m.(COLUMN)39 Dublin(COLUMN)cloudy(COLUMN)1 p.m.(COLUMN)50 Geneva(COLUMN)pt. cldy.(COLUMN)1 p.m.(COLUMN)41 Hong Kong(COLUMN)cloudy(COLUMN)8 p.m.(COLUMN)66 Lisbon(COLUMN)clear(COLUMN)noon(COLUMN)63 London(COLUMN)cloudy(COLUMN)1 p.m.(COLUMN)48 Madrid(COLUMN)clear(COLUMN)1 p.m.(COLUMN)54 Malta(COLUMN)pt. cldy.(COLUMN)1 p.m.(COLUMN)63 Manita(COLUMN)pt. cldy.(COLUMN)8 p.m.(COLUMN)84 Moscow(COLUMN)snow(COLUMN)3 p.m.(COLUMN)34 New Delhi(COLUMN)pt. cldy.(COLUMN)5 p.m.(COLUMN)72 Nice(COLUMN)clear(COLUMN)1 p.m.(COLUMN)63 Oslo(COLUMN)cloudy(COLUMN)1 p.m.(COLUMN)36 Paris(COLUMN)clear(COLUMN)1 p.m.(COLUMN)46 Peking(COLUMN)clear(COLUMN)8 p.m.(COLUMN)37 Rome(COLUMN)pt. cldy.(COLUMN)1 p.m.(COLUMN)59 Saigon(COLUMN)pt. cldy.(COLUMN)-p.m.(COLUMN)82 Safia(COLUMN)clear(COLUMN)2 p.m.(COLUMN)57 Stockholm(COLUMN)cloudy(COLUMN)1 p.m.(COLUMN)34 Sydney(COLUMN)pt. cldy.(COLUMN)10 p.m.(COLUMN)79 Tel Aviv(COLUMN)clear(COLUMN)2 p.m.(COLUMN)81 Tokyo(COLUMN)clear(COLUMN)9 p.m.(COLUMN)52 Tunis(COLUMN)pt. cldy.(COLUMN)1 p.m.(COLUMN)57 Vienna(COLUMN)clear(COLUMN)1 p.m.(COLUMN)43 Warsaw(COLUMN)pt. cldy.(COLUMN)1 p.m.(COLUMN)39(END TABLE) Temperatures (Western Hemisphere)(TABLE) City(COLUMN)Weather(COLUMN)High(COLUMN)Low Acapulco(COLUMN)fair(COLUMN)88(COLUMN)70 Barbados(COLUMN)pt. cldy.(COLUMN)82(COLUMN)73 Bermuda(COLUMN)pt. cldy.(COLUMN)62(COLUMN)56 Bogota(COLUMN)pt. cldy.(COLUMN)72(COLUMN)45 Calgary(COLUMN)pt. cldy.(COLUMN)41(COLUMN)21 Culiacan(COLUMN)fair(COLUMN)82(COLUMN)56 Edmonton(COLUMN)pt. cldy.(COLUMN)21(COLUMN)10 Havana(COLUMN)pt. cldy.(COLUMN)77(COLUMN)64 Kingston(COLUMN)pt. cldy.(COLUMN)92(COLUMN)73 Montego Bay(COLUMN)fair(COLUMN)82(COLUMN)69 Mexico City(COLUMN)fair(COLUMN)77(COLUMN)48 Monterrev(COLUMN)fair(COLUMN)82(COLUMN)61 Montreal(COLUMN)clear(COLUMN)23(COLUMN)7 Nassau(COLUMN)cloudy(COLUMN)73(COLUMN)59 Ottawa(COLUMN)clear(COLUMN)25(COLUMN)7 Regina(COLUMN)snow(COLUMN)14(COLUMN)-2 St. Kitts(COLUMN)fair(COLUMN)87(COLUMN)71 Toornto(COLUMN)clear(COLUMN)27(COLUMN)7 Vancouver(COLUMN)rain(COLUMN)50(COLUMN)45 Veracruz(COLUMN)fair(COLUMN)80(COLUMN)66 Winnipeg(COLUMN)clear(COLUMN)14(COLUMN)-6(END TABLE)