Washington: Today - Increasingly cloudy, high in the mid 30s, low near 30. The chance of precipitation is 10 per cent today and 50 per cent tonight. Rain or sleet is likely by tonight. Wednesday - Rain, high in mid 40s.

Maryland and Virginia: Today - Increasingly cloudy, highs from the 30s to the low 40s. Rain or sleet is likely by tonight. Wednesday - Rain, highs from the 30s to the mid 40s.

Lower Potomac and Chesapeake Bay: Today - Fair with visibility of more than 5 miles, except in rain. Rain is likely by tonight. Wind will be from the south at less than 20 knots. Waves in unprotected waters will be from 1 to 2 feet.

Extended Area Forecast for Thursday through Saturday: Partly cloudy on Thursday, a chance of precipitation on Friday night and on Saturday. Highs will be from the mid 30s to the mid 40s, lows from near 20 to the mid 30s. Normal Washington temperatures for the period are a high of 44 and a low of 27.

West Virginia: Today - Increasingly cloudy, highs from the upper 30s to the mid 40s, lows in the low 30s. Rain will be likely Tuesday night. Wednesday - Rain, highs from the upper 30s to the mid 40s. The National Weather Forecast for today - snow will extend from the upper Great Lakes and lower Ohio Valley through the northern two-thirds of the Mississippi Valley and the central plains, across Oklahoma and northern Texas. There will be rain from southern and central Texas across the Gulf Coast, through the upper Ohio and Tennesse valleys into the central Great Lakes. Rain along, the Pacific northwest Coast will change to snow in the northern Rockies. Temperatures will be seasonably mild over the Great Lakes and New England. The remainder of the nation will be cool or cold.

Almanac Data for Today -

Sun Rises 7.21 a.m., sets 5.20 p.m.; moon rises 5.04 p.m., sets 6.32 a.m.; Tides: high 8.06 a.m. and 8.24 p.m., low 2.42 a.m. and 2.52 p.m. High and low tides at the following locations may be obtained by subtracting the hours indicated from the tides above. Annapolis (1 1/2), Bloody Point Lighthouse (4 1/2), Deale, Md. (4 1/2), Colonial Beach (5), 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 during the 2 p.m. to 3 p.m. period was 30 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 be near 3.8 feet today. Local Temp., Humidity(TABLE) Time(COLUMN)T.(COLUMN)H. 12 midn.(COLUMN)28(COLUMN)60 1 a.m.(COLUMN)25(COLUMN)63 2 a.m.(COLUMN)26(COLUMN)55 3 a.m.(COLUMN)23(COLUMN)62 4 a.m.(COLUMN)20(COLUMN)71 5 a.m.(COLUMN)20(COLUMN)71 6 a.m.(COLUMN)20(COLUMN)61 7 a.m.(COLUMN)19(COLUMN)68 8 a.m.(COLUMN)21(COLUMN)65 9 a.m.(COLUMN)22(COLUMN)65 10 a.m.(COLUMN)27(COLUMN)58 11 a.m.(COLUMN)31(COLUMN)51 12 noon(COLUMN)34(COLUMN)45 1 p.m.(COLUMN)35(COLUMN)48 2 p.m.(COLUMN)38(COLUMN)42 3 p.m.(COLUMN)39(COLUMN)30 4 p.m.(COLUMN)38(COLUMN)31 5 p.m.(COLUMN)38(COLUMN)31 6 p.m.(COLUMN)36(COLUMN)42 7 p.m.(COLUMN)35(COLUMN)48(END TABLE) Temperatures ending 8 a.m. (EST) yesterday:(TABLE) City(COLUMN)H.(COLUMN)L. Albany(COLUMN)31(COLUMN)12 Albuquerque(COLUMN)43(COLUMN)27 Amarillo(COLUMN)49(COLUMN)27 Anchorage(COLUMN)32(COLUMN)2 Asheville(COLUMN)37(COLUMN)15 Atlanta(COLUMN)46(COLUMN)2 Austin(COLUMN)35(COLUMN) Baltimore(COLUMN)33(COLUMN)8 Billings(COLUMN)32(COLUMN)1 Birmingham(COLUMN)41(COLUMN)26 Bismarck(COLUMN)22(COLUMN)11 Boise(COLUMN)43(COLUMN)27 Boston(COLUMN)35(COLUMN) Brownsville(COLUMN)41(COLUMN)40 Buffalo(COLUMN)23(COLUMN)13 Burlington(COLUMN)24(COLUMN)8 Casper(COLUMN)38(COLUMN)13 Charleston, S.C.(COLUMN)50(COLUMN)34 Charleston, W. Va.(COLUMN)31(COLUMN)4 Charlotte(COLUMN)38(COLUMN)23 Cheyenne(COLUMN)39(COLUMN)24 Chicago(COLUMN)19(COLUMN)11 Cincinnati(COLUMN)24(COLUMN)2 Cleveland(COLUMN)22(COLUMN)1 Columbia, S.C.(COLUMN)40(COLUMN)22 Columbus(COLUMN)17(COLUMN)7 Dal.-Ft. Worth(COLUMN)29(COLUMN)27 Dayton(COLUMN)17(COLUMN)zero Denver(COLUMN)42(COLUMN)21 Des Moines(COLUMN)26(COLUMN)17 Detroit(COLUMN)20(COLUMN)Zero Duluth(COLUMN)15(COLUMN)15 El Paso(COLUMN)54(COLUMN)34 Fairbanks(COLUMN)15(COLUMN)5 Fargo(COLUMN)14(COLUMN)10 Flagstaff(COLUMN)40(COLUMN)30 Great Falls(COLUMN)35(COLUMN)15 Hartford(COLUMN)30(COLUMN)6 Helena(COLUMN)38(COLUMN)12 Honolulu(COLUMN)57(COLUMN)67 Houston(COLUMN)38(COLUMN)38 Indianapolis(COLUMN)22(COLUMN)2 Jackson, Miss(COLUMN)42(COLUMN)28 Jacksonville(COLUMN)59(COLUMN)46 Juneau(COLUMN)37(COLUMN)34 Kansas City(COLUMN)32(COLUMN)22 Las Vegas(COLUMN)54(COLUMN)40 Little Rock(COLUMN)37(COLUMN)21 Los Angeles(COLUMN)65(COLUMN)50 Louisville(COLUMN)30(COLUMN)3 Memphis(COLUMN)39(COLUMN)25 Miami Beach(COLUMN)71(COLUMN)64 Midland-Odessa(COLUMN)54(COLUMN)29 Milwaukee(COLUMN)19(COLUMN)16 Mpls.-St. Paul(COLUMN)20(COLUMN)13 Nashville(COLUMN)35(COLUMN)12 New Orleans(COLUMN)44(COLUMN)42 New York(COLUMN)30(COLUMN)22 Norfolk(COLUMN)35(COLUMN)29 North Platte(COLUMN)40(COLUMN)9 Oklahoma City(COLUMN)32(COLUMN)24 Omaha(COLUMN)23(COLUMN)17 Orlando(COLUMN)69(COLUMN)55 Philadelphia(COLUMN)30(COLUMN)11 Phoenix(COLUMN)65(COLUMN)46 Pittsburgh(COLUMN)23(COLUMN)4 Portland, Maine(COLUMN)36(COLUMN)12 Portland, Ore.(COLUMN)45(COLUMN)29 Providence(COLUMN)33(COLUMN)12 Raleigh(COLUMN)36(COLUMN)20 Rapid City(COLUMN)34(COLUMN)23 Reno(COLUMN)43(COLUMN)22 Richmond(COLUMN)34(COLUMN)18 St. Louis(COLUMN)30(COLUMN)15 St. Prbg.-Tampa(COLUMN)61(COLUMN)49 Salt Lake City(COLUMN)45(COLUMN)30 San Antonio(COLUMN)50(COLUMN)34 San Diego(COLUMN)66(COLUMN)44 San Francisco(COLUMN)59(COLUMN)51 San Juan(COLUMN)85(COLUMN)73 St. Ste. Marie(COLUMN)25(COLUMN)16 Seattle(COLUMN)46(COLUMN)36 Shreveport(COLUMN)32(COLUMN)24 Sioux Falls(COLUMN)22(COLUMN)3 Spokane(COLUMN)36(COLUMN)19 Syracuse(COLUMN)27(COLUMN)8 Topeka(COLUMN)34(COLUMN)22 Tucson(COLUMN)63(COLUMN)41 Tulsa(COLUMN)34(COLUMN)25 Washington(COLUMN)35(COLUMN)19 Wichita(COLUMN)27(COLUMN)22(END TABLE)(TABLE) City(COLUMN)Weather(COLUMN)Time(COLUMN)Temp. Acapulco(COLUMN)clear(COLUMN)(COLUMN)72 Aberdeen(COLUMN)rain(COLUMN)1 p.m.(COLUMN)37 Amsterdam(COLUMN)clear(COLUMN)1 p.m.(COLUMN)41 Ankara(COLUMN)cloudy(COLUMN)3 p.m.(COLUMN)3 Athens(COLUMN)pt. cldy.(COLUMN)2 p.m.(COLUMN)59 Auckland(COLUMN)clear(COLUMN)mdnt.(COLUMN)66 Berlin(COLUMN)cloudy(COLUMN)1 p.m.(COLUMN)34 Birmingham(COLUMN)rain(COLUMN)1 p.m.(COLUMN)39 Brussels(COLUMN)pt. cldy.(COLUMN)1 p.m.(COLUMN)36 Cairo(COLUMN)clear(COLUMN)2 p.m.(COLUMN)66 Casablanca(COLUMN)clear(COLUMN)noon(COLUMN)59 Copenhagen(COLUMN)cloudy(COLUMN)1 p.m.(COLUMN)32 Dublin(COLUMN)cloudy(COLUMN)1 p.m.(COLUMN)52 Geneva(COLUMN)pt. cldy.(COLUMN)1 p.m.(COLUMN)39 Hong Kong(COLUMN)clear(COLUMN)8 p.m.(COLUMN)64 Lisbon(COLUMN)pt. cldy.(COLUMN)noon(COLUMN)55 London(COLUMN)rain(COLUMN)1 p.m.(COLUMN)41 Madrid(COLUMN)pt. cldy.(COLUMN)1 p.m.(COLUMN)46 Malta(COLUMN)rain(COLUMN)1 p.m.(COLUMN)55 Manila(COLUMN)rain(COLUMN)8 p.m.(COLUMN)73 Moscow(COLUMN)clear(COLUMN)3 p.m.(COLUMN)12 Nice(COLUMN)clear(COLUMN)1 p.m.(COLUMN)52 Oslo(COLUMN)snow(COLUMN)1 p.m.(COLUMN)25 Paris(COLUMN)cloudy(COLUMN)1 P.m.(COLUMN)39 Peking(COLUMN)cloudy(COLUMN)8 p.m.(COLUMN)30 Rome(COLUMN)pt. cldy.(COLUMN)1 p.m.(COLUMN)52 Saigon(COLUMN)clear(COLUMN)8 p.m.(COLUMN)81 Sofia(COLUMN)clear(COLUMN)2 p.m.(COLUMN)37 Stockholm(COLUMN)snow(COLUMN)1 p.m.(COLUMN)27 Sydney(COLUMN)rain(COLUMN)10 p.m.(COLUMN)75 Tel Aviv(COLUMN)pt. cldy.(COLUMN)2 p.m.(COLUMN)64 Tokyo(COLUMN)clear(COLUMN)1 p.m.(COLUMN)55 Tunis(COLUMN)pt. cldy.(COLUMN)1 p.m.(COLUMN)55 Vienna(COLUMN)cloudy(COLUMN)1 p.m.(COLUMN)36 Warsaw(COLUMN)clear(COLUMN)1 p.m.(COLUMN)32(END TABLE)(TABLE) City(COLUMN)Weather(COLUMN)High(COLUMN)Low Barbados(COLUMN)cloudy(COLUMN)82(COLUMN)75 Bermuda(COLUMN)cloudy(COLUMN)70(COLUMN)61 Calgary(COLUMN)clear(COLUMN)36(COLUMN)14 Culiacan(COLUMN)cloudy(COLUMN)90(COLUMN)55 Edmonton(COLUMN)pt. cldy.(COLUMN)39(COLUMN)18 Havana(COLUMN)cloudy(COLUMN)68(COLUMN)68 Kinston(COLUMN)cloudy(COLUMN)84(COLUMN)70 Montego Bay(COLUMN)clear(COLUMN)82(COLUMN)72 Mexico City(COLUMN)fair(COLUMN)68(COLUMN)45 Monterrey(COLUMN)rain(COLUMN)48(COLUMN)43 Montreal(COLUMN)clear(COLUMN)25(COLUMN)19 Nassau(COLUMN)cloudy(COLUMN)75(COLUMN)68 Ottawa(COLUMN)cloudy(COLUMN)23(COLUMN)18 Regina(COLUMN)cloudy(COLUMN)30(COLUMN)23 St. Kitts(COLUMN)pt. cldy.(COLUMN)83(COLUMN)69 St. Thomas(COLUMN)pt. cldy.(COLUMN)83(COLUMN)69 Toronto(COLUMN)cloudy(COLUMN)23(COLUMN)12 Vancouver(COLUMN)pt. cldy(COLUMN)45(COLUMN)32 Veracruz(COLUMN)pt. cldy.(COLUMN)72(COLUMN)63 Winnipeg(COLUMN)pt. cldy.(COLUMN)12(COLUMN)9(END TABLE)