Lower Potomac and Chesapeake Bay - Clearing with visibility improving to 5 miles or more by late in the day. Winds will be northerly at 10 to 20 knots, diminishing to 6 to 12 knots by evening. Waves will average 2 to 3 feet.

West Virginia: Today - Partly cloudy cloudy, high in mid 50s. Lows from the mid 20s to mid 30s. Wednesday - Mostly sunny and warmer. Highs from the mid 50s to low 60s.

Washington: Today-Gradual clearing windy and cool, high near 60, low near 40.The chance of rain is 10 percent. Winds will be from the north at 15 to 20 m.p.h. Wednesday - Sunny, high in the mid 60s.

Maryland and Virginia: Today - Gradual clearing, windy and cool, highs in the 50s to near 60. lows in the 30s and 40s with frost likely in some areas. Wednesday - Sunny, highs from the 50s to mid 60s.

Extended Area Forecast for Thursday through Saturday - a chance of showers early Thursday otherwise fair and cool. Highs will average from the 50s to mid 60s. Lows in the 30s and 40s. Normal Washington temperatures for the period are a high of 68 and a low of 48.

The National Weather Forecast for today - Rainshowers will be widely scattered across the northern Rockies and the upper Mississippi Valley. Fair skies will predominate throughout the Pacific Northeast and from southern California through the southern Plains. across the Gulf Coast into the lower Missouri and southern Ohio Valleys and thru most of the Atlantic Coast states. Seasonably mild temperatures are forecast along the Pacific Coast, the Plateau Region and the southern two-thirds of the Rockies into Oklahoma and Texas. The remainder of the country will be somewhat cooler than normal for this time of year.

Almanac Data for today: The sun rises 7:19 a.m. sets 6:27 p.m.; moon rises 7:40 p.m., sets 8:35 a.m. Tides: high 9:40 a.m. and 10:01 p.m.; low 3:59 a.m. and [WORD ILLEGIBLE] 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 Governments Air Quality Index for yesterday showed the high reading in the Washington area during the 3 p.m. period was 13 for the pollutant, photochemical oxicants. 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 2.9 feet today. Local Temps., Humidity(TABLE) Time(COLUMN)T.(COLUMN)H. 12 mid.(COLUMN)48(COLUMN)66 1 a.m.(COLUMN)51(COLUMN)54 2 a.m.(COLUMN)49(COLUMN)59 3 a.m.(COLUMN)49(COLUMN)59 4 a.m.(COLUMN)49(COLUMN)61 5 a.m.(COLUMN)50(COLUMN)61 6 a.m.(COLUMN)49(COLUMN)63 7 a.m.(COLUMN)49(COLUMN)61 8 a.m.(COLUMN)49(COLUMN)63 9 a.m.(COLUMN)51(COLUMN)57 10 a.m.(COLUMN)55(COLUMN)51 11 a.m.(COLUMN)57(COLUMN)49 12 noon(COLUMN)59(COLUMN)42 1 p.m.(COLUMN)60(COLUMN)41 2 p.m.(COLUMN)59(COLUMN)37 3 p.m.(COLUMN)59(COLUMN)42 4 a.m.(COLUMN)55(COLUMN)53 5 p.m.(COLUMN)53(COLUMN)69 6 p.m.(COLUMN)52(COLUMN)77 7 p.m.(COLUMN)52(COLUMN)80(END TABLE) Temperatures ending 8 a.m. (EDT) yesterday(TABLE) City(COLUMN)H.(COLUMN)L. Albany(COLUMN)50(COLUMN)25 Albuquerque(COLUMN)78(COLUMN)49 Amarillo(COLUMN)77(COLUMN)45 Anchorage(COLUMN)43(COLUMN)35 Asheville(COLUMN)60(COLUMN)33 Atlanta(COLUMN)65(COLUMN)41 Atlantic City(COLUMN)52(COLUMN)44 Austin(COLUMN)81(COLUMN)50 Baltimore(COLUMN)60(COLUMN)38 Billings(COLUMN)65(COLUMN)36 Birmingham(COLUMN)64(COLUMN)40 Bismarck(COLUMN)52(COLUMN)23 Boise(COLUMN)75(COLUMN)45 Boston(COLUMN)59(COLUMN)34 Brownsville(COLUMN)82(COLUMN)56 Buffalo(COLUMN)49(COLUMN)33 Burlington, Vt.(COLUMN)39(COLUMN)24 Casper(COLUMN)72(COLUMN)32 Charleston, S.C.(COLUMN)68(COLUMN)52 Charleston, W.V.(COLUMN)49(COLUMN)39 Charlotte(COLUMN)61(COLUMN)41 Cheyenne(COLUMN)68(COLUMN)36 Chicago(COLUMN)51(COLUMN)43 Cincinnati(COLUMN)54(COLUMN)37 Cleveland(COLUMN)55(COLUMN)41 Columbia, S.C.(COLUMN)68(COLUMN)34 Columbus(COLUMN)52(COLUMN)43 Dal.-Ft. Worth(COLUMN)85(COLUMN)54 Dayton(COLUMN)54(COLUMN)35 Denver(COLUMN)73(COLUMN)39 Des Moines(COLUMN)64(COLUMN)38 Detroit(COLUMN)51(COLUMN)40 Duluth(COLUMN)45(COLUMN)29 El Paso(COLUMN)81(COLUMN)48 Evansville(COLUMN)58(COLUMN)41 Fairbanks(COLUMN)27(COLUMN)06 Fargo(COLUMN)46(COLUMN)23 Flagstaff(COLUMN)75(COLUMN)32 Great Falls(COLUMN)70(COLUMN)49 Hartford(COLUMN)51(COLUMN)23 Helena(COLUMN)69(COLUMN)38 Honolulu(COLUMN)86(COLUMN)72 Indianapolis(COLUMN)54(COLUMN)41 Jackson(COLUMN)74(COLUMN)45 Jacksonville(COLUMN)67(COLUMN)39 Juneau(COLUMN)52(COLUMN)31 Kansas City(COLUMN)69(COLUMN)36 Las Vegas(COLUMN)91(COLUMN)61 Little Rock(COLUMN)73(COLUMN)50 Los Angeles(COLUMN)82(COLUMN)58 Louisville(COLUMN)55(COLUMN)42 Memphis(COLUMN)71(COLUMN)48 Miami Beach(COLUMN)77(COLUMN)69 Midland(COLUMN)77(COLUMN)46 Milwaukee(COLUMN)44(COLUMN)41 Mpls. St. Paul(COLUMN)49(COLUMN)33 Nashville(COLUMN)63(COLUMN)48 New Orleans(COLUMN)72(COLUMN)48 New York(COLUMN)53(COLUMN)43 Norfolk(COLUMN)62(COLUMN)43 North Platte(COLUMN)69(COLUMN)25 Oklahoma City(COLUMN)84(COLUMN)49 Omaha(COLUMN)62(COLUMN)32 Orlando(COLUMN)76(COLUMN)55 Philadelphia(COLUMN)56(COLUMN)38 Phoenix(COLUMN)100(COLUMN)66 Pittsburgh(COLUMN)48(COLUMN)35 Portland, Ore.(COLUMN)65(COLUMN)56 Providence(COLUMN)56(COLUMN)28 Raleigh(COLUMN)65(COLUMN)10 Rapid City(COLUMN)63(COLUMN)28 Reno(COLUMN)82(COLUMN)35 Richmond(COLUMN)63(COLUMN)39 St. Louis(COLUMN)68(COLUMN)37 St. Prbg. Tampa(COLUMN)72(COLUMN)55 Salt Lake City(COLUMN)75(COLUMN)45 San Antonio(COLUMN)80(COLUMN)49 San Diego(COLUMN)76(COLUMN)66 San Francisco(COLUMN)62(COLUMN)56 San Juan(COLUMN)90(COLUMN)78 St. Ste. Marie(COLUMN)46(COLUMN)29 Seattle(COLUMN)66(COLUMN)58 Shreveport(COLUMN)79(COLUMN)51 Spokane(COLUMN)67(COLUMN)42 Syracuse(COLUMN)48(COLUMN)33 Topeka(COLUMN)70(COLUMN)37 Tucson(COLUMN)93(COLUMN)62 Tulsa(COLUMN)83(COLUMN)44 Washington(COLUMN)61(COLUMN)46 Wichita(COLUMN)76(COLUMN)41(END TABLE) Temperatures Abroad Yesterday(TABLE) City(COLUMN)Weather(COLUMN)Time(COLUMN)Temp. Aberdeen(COLUMN)clear(COLUMN)1 p.m.(COLUMN)50 Amsterdam(COLUMN)cloudy(COLUMN)1 p.m.(COLUMN)54 Ankara(COLUMN)clear(COLUMN)3 p.m.(COLUMN)72 Athens(COLUMN)pt. cldy.(COLUMN)2 p.m.(COLUMN)72 Auckland(COLUMN)clear(COLUMN)midnight(COLUMN)54 Berlin(COLUMN)pt. cldy.(COLUMN)1 p.m.(COLUMN)55 Birmingham(COLUMN)cloudy(COLUMN)1 p.m.(COLUMN)54 Bonn(COLUMN)cloudy(COLUMN)1 p.m.(COLUMN)59 Brussels(COLUMN)cloudy(COLUMN)1 p.m.(COLUMN)55 Casablanca(COLUMN)clear(COLUMN)noon(COLUMN)72 Copenhagen(COLUMN)pt.(COLUMN)cldy.(COLUMN)1 p.m.(COLUMN)55 Dublin(COLUMN)cloudy(COLUMN)1 p.m.(COLUMN)52 Geneva(COLUMN)pt. cloudy(COLUMN)1 p.m.(COLUMN)52 Hong Kong(COLUMN)rain(COLUMN)8 p.m.(COLUMN)70 Jerusalem(COLUMN)pt. cldy.(COLUMN)2 p.m.(COLUMN)73 Lisbon(COLUMN)cloudy(COLUMN)noon(COLUMN)68 London(COLUMN)cloudy(COLUMN)1 p.m.(COLUMN)55 Madrid(COLUMN)cloudy(COLUMN)1 p.m.(COLUMN)75 Malta(COLUMN)pt. cldy.(COLUMN)1 p.m.(COLUMN)73 Manila(COLUMN)pt. Cldy.(COLUMN)8 p.m.(COLUMN)79 Moscow(COLUMN)clear(COLUMN)3 p.m.(COLUMN)39 New Delhi(COLUMN)clear(COLUMN)5 p.m.(COLUMN)88 Nice(COLUMN)pt. Cldy.(COLUMN)1 p.m.(COLUMN)68 Oslo(COLUMN)rain(COLUMN)1 p.m.(COLUMN)48 Paris(COLUMN)cloudy(COLUMN)1 p.m.(COLUMN)61 Peking(COLUMN)clear(COLUMN)8 p.m.(COLUMN)52 Rome(COLUMN)clear(COLUMN)1 p.m.(COLUMN)72 Saigon(COLUMN)pt. cldy.(COLUMN)8 p.m.(COLUMN)79 Sofia(COLUMN)clear(COLUMN)2 p.m.(COLUMN)57 Stockholm(COLUMN)cloudy(COLUMN)1 p.m.(COLUMN)46 Sydney(COLUMN)clear(COLUMN)10 p.m.(COLUMN)61 Tokyo(COLUMN)clear(COLUMN)9 p.m.(COLUMN)63 Tunis(COLUMN)clear(COLUMN)1 p.m.(COLUMN)73 Vienna(COLUMN)clear(COLUMN)1 p.m.(COLUMN)55 Warsaw(COLUMN)cloudy(COLUMN)1 p.m.(COLUMN)52(END TABLE) Temperatures (Western Hemisphere)(TABLE) City(COLUMN)Weather(COLUMN)High(COLUMN)Low Acapulco(COLUMN)pt.cldy.(COLUMN)88(COLUMN)76 Barbaoos(COLUMN)pt.cldy.(COLUMN)88(COLUMN)77 Bermuda(COLUMN)pt.cldy.(COLUMN)83(COLUMN)77 Bogota(COLUMN)cloudy(COLUMN)64(COLUMN)48 Calgary(COLUMN)cloudy(COLUMN)61(COLUMN)48 Edmonton(COLUMN)pt.cldy.(COLUMN)61(COLUMN)36 Havana(COLUMN)pt.cldy.(COLUMN)86(COLUMN)73 Kingston(COLUMN)pt.cldy.(COLUMN)90(COLUMN)73 Montego Bay(COLUMN)pt.cldy.(COLUMN)90(COLUMN)73 Mexico City(COLUMN)fair(COLUMN)57(COLUMN)41 Monterrey(COLUMN)pt.cidy.(COLUMN)76(COLUMN)53 Montreal(COLUMN)pt.cidy.(COLUMN)39(COLUMN)27 Nassau(COLUMN)pt.cldy.(COLUMN)88(COLUMN)77 Ottawa(COLUMN)clear(COLUMN)39(COLUMN)23 Regina(COLUMN)clear(COLUMN)48(COLUMN)30 St. Kitts(COLUMN)pt. cldy.(COLUMN)90(COLUMN)77 Toronto(COLUMN)pt. cldy.(COLUMN)48(COLUMN)30 Vancouver(COLUMN)cloudy(COLUMN)64(COLUMN)52 Vera Cruz(COLUMN)pt. cldy.(COLUMN)79(COLUMN)75 Winnipeg(COLUMN)clear(COLUMN)45(COLUMN)23 (END TABLE)