Washington: Today - Cloudy, chance of rain, high near 80, low in the mid 60s. The chance of rain is 50 per cent today and 30 per cent tonight. Thursday - Partially clearing, high near 80.

Maryland and Virginia: Today - Cloudy, chance of rain, highs from the low 70s to near 80, lows in the 60s. Thursday - Partially clearing, high from the 70s to near 80.

Lower Potomac and Chesapeake Bay: Today - Rain, with visibility of less than 5 miles. Waves in unprotected waters will be less than 2 feet. Wind will be from the east at less than 15 knots today, but from the northeast at near 12 knots tonight.

West Virginia: Today - Rain, highs from the mid 70s to the low 80s, lows in the 50s. Thursday - Rain ending, highs from the mid 70s to the low 80s.

Extended Area Forecast for Friday through Sunday: Fair through the period, except for a chance of showers in southeastern Virginia on Friday. Highs will be near 80, lows in the 60s. Normal Washington temperatures for the period are a high of 80 and a low of 60.

The National Weather Forecast for today - Thundershowers and showers will scatter from the lower Mississippi Valley through the Ohio Valley and into the lower Great Lakes and the middle Atlantic states, as well as in the Carolinas. Showers will also extend from Washington and Oregon into the northern Rockies and down the Rockies into western and southern Texas. Thundershowers will fall in the central and southern Rockies and southern high Plains. The rest of the nation will have partly cloudy skies. Temperatures will be cool west of the divide and mild to warm east of the divide, except for hot to very hot temperatures in the upper Mississippi Valley and western Great Lakes.

Atmanac Data for today - Sun rises 5:58 a.m., sets 8:22 p.m.; moon rises 12:29 p.m., sets 1:03 a.m. Tides: High 1:36 a.m. and 1:52 p.m., low 8:23 a.m. and 8:50 p.m. High and low tides at the following locations can be obtained by subtracting the hours indicated from the tides above. Annapolis (3 1/2); Bloody Point Lighthouse (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). Pollen count: 40 for grass (note: 7 or high is considered undesirable.)

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 24 and 49 indicate fair air quality. When the index exceeds 100 the air becomes hazardous and persons with lung, heart and eye problems should restrict their activity. The forecast for today indicates the air quality will improve.

The National Weather Service forecasts that the Potomac River stage at Little Falls with be near 3.2 feet. Local Temp., Humidity(TABLE) Time(COLUMN)T.(COLUMN)H. 12 mid.(COLUMN)72(COLUMN)73 1 a.m.(COLUMN)71(COLUMN)76 2 a.m.(COLUMN)70(COLUMN)79 3 a.m.(COLUMN)70(COLUMN)79 4 a.m.(COLUMN)69(COLUMN)81 5 a.m.(COLUMN)68(COLUMN)84 7 a.m.(COLUMN)70(COLUMN)79 8 a.m.(COLUMN)70(COLUMN)79 9 a.m.(COLUMN)74(COLUMN)69 10 a.m.(COLUMN)76(COLUMN)64 11 a.m.(COLUMN)78(COLUMN)60 12 noon(COLUMN)79(COLUMN)58 1 p.m.(COLUMN)79(COLUMN)58 2 p.m.(COLUMN)78(COLUMN)60 3 p.m.(COLUMN)78(COLUMN)60 4 p.m.(COLUMN)77(COLUMN)62 5 p.m.(COLUMN)78(COLUMN)60 6 p.m.(COLUMN)77(COLUMN)62 7 p.m.(COLUMN)75(COLUMN)66(END TABLE) Temperatures ending 8 a.m. (EDT) Yesterday(TABLE) City(COLUMN)H.(COLUMN)L. Albany(COLUMN)87(COLUMN)60 Albuquerque(COLUMN)87(COLUMN)59 Amarillo(COLUMN)79(COLUMN)57 Anchorage(COLUMN)55(COLUMN)45 Ashville(COLUMN)76(COLUMN)57 Atlanta(COLUMN)81(COLUMN)63 Atlanta City(COLUMN)71(COLUMN)62 Austin(COLUMN)85(COLUMN)66 Baltimore(COLUMN)83(COLUMN)61 Billings(COLUMN)78(COLUMN)54 Birmingham(COLUMN)86(COLUMN)65 Bismarck(COLUMN)76(COLUMN)62 Boise(COLUMN)60(COLUMN)48 Boston(COLUMN)88(COLUMN)66 Brownsville(COLUMN)88(COLUMN)70 Buffalo(COLUMN)83(COLUMN)67 Burlington(COLUMN)91(COLUMN)62 Casper(COLUMN)79(COLUMN)45 Charleston, S.C.(COLUMN)78(COLUMN)70 Charleston, W.Va.(COLUMN)85(COLUMN)59 Charlotte(COLUMN)80(COLUMN)65 Cheyenne(COLUMN)76(COLUMN)44 Chicago(COLUMN)92(COLUMN)66 Cincinnati(COLUMN)81(COLUMN)60 Cleveland(COLUMN)83(COLUMN)62 Columbia, S.C.(COLUMN)86(COLUMN)63 Columbus(COLUMN)86(COLUMN)62 Dal.-Ft. Worth(COLUMN)87(COLUMN)63 Dayton(COLUMN)85(COLUMN)61 Denver(COLUMN)85(COLUMN)56 Des Moines(COLUMN)84(COLUMN)63 Detroit(COLUMN)84(COLUMN)63 Duluth(COLUMN)68(COLUMN)49 El Paso(COLUMN)94(COLUMN)57 Fairbanks(COLUMN)62(COLUMN)44 Fargo(COLUMN)74(COLUMN)62 Flagstaff(COLUMN)68(COLUMN)48 Great Falls(COLUMN)73(COLUMN)43 Hartford(COLUMN)89(COLUMN)64 Helena(COLUMN)72(COLUMN)45 Honolulu(COLUMN)85(COLUMN)74 Houston(COLUMN)84(COLUMN)68 Indianapolis(COLUMN)86(COLUMN)65 Jackson, Miss.(COLUMN)90(COLUMN)59 Jacksonville(COLUMN)78(COLUMN)68 Juneau(COLUMN)59(COLUMN)45 Kansas City(COLUMN)77(COLUMN)63 Las Vegas(COLUMN)73(COLUMN)54 Little Rock(COLUMN)89(COLUMN)64 Los Angeles(COLUMN)62(COLUMN)54 Louisville(COLUMN)84(COLUMN)63 Memphis(COLUMN)89(COLUMN)66 Miami Beach(COLUMN)81(COLUMN)75 Midland-Odessa(COLUMN)89(COLUMN)70 Milwaukee(COLUMN)87(COLUMN)59 Mpls.-St. Paul(COLUMN)81(COLUMN)61 Nashville(COLUMN)85(COLUMN)63 New Orleans(COLUMN)87(COLUMN)64 New York(COLUMN)81(COLUMN)67 Norfolk(COLUMN)83(COLUMN)65 North Platte(COLUMN)78(COLUMN)62 Oklahoma City(COLUMN)80(COLUMN)64 Omaha(COLUMN)86(COLUMN)64 Orlando(COLUMN)87(COLUMN)67 Philadelphia(COLUMN)85(COLUMN)65 Phoenix(COLUMN)91(COLUMN)73 Pittsburgh(COLUMN)81(COLUMN)58 Portland, Maine(COLUMN)84(COLUMN)53 Portland, Ore.(COLUMN)57(COLUMN)47 Providence(COLUMN)83(COLUMN)65 Raleigh(COLUMN)83(COLUMN)64 Rapid City(COLUMN)81(COLUMN)60 Reno(COLUMN)55(COLUMN)38 Richmond(COLUMN)86(COLUMN)59 St. Louis(COLUMN)84(COLUMN)63 St. Prbg-Tampa(COLUMN)91(COLUMN)69 Salt Lake City(COLUMN)73(COLUMN)49 San Antonio(COLUMN)84(COLUMN)69 San Diego(COLUMN)63(COLUMN)58 San Francisco(COLUMN)60(COLUMN)61 San Juan(COLUMN)78(COLUMN)74 St. Ste. Marie(COLUMN)79(COLUMN)49 Seattle(COLUMN)53(COLUMN)48 Shreveport(COLUMN)88(COLUMN)62 Sioux Falls(COLUMN)80(COLUMN)66 Spokane(COLUMN)55(COLUMN)40 Syracuse(COLUMN)93(COLUMN)64 Topeka(COLUMN)77(COLUMN)62 Tucson(COLUMN)92(COLUMN)67 Tulsa(COLUMN)81(COLUMN)64 Washington(COLUMN)84(COLUMN)67 Wichita(COLUMN)78(COLUMN)62(END TABLE) Temperatures Abroad Yesterday(TABLE) City(COLUMN)Weather(COLUMN)Time(COLUMN)Temp. Aberdeen(COLUMN)cloudy(COLUMN) 1 p.m.(COLUMN) 61 Amsterdam(COLUMN)clear(COLUMN) 1 p.m.(COLUMN) 70 Ankara(COLUMN)pt. cldy.(COLUMN) 3 p.m.(COLUMN) 73 Athens(COLUMN)cloudy(COLUMN) 2 p.m.(COLUMN) 79 Auckland(COLUMN)rain(COLUMN)midnight(COLUMN) 57 Berlin(COLUMN)clear(COLUMN) 1 p.m.(COLUMN) 68 Birmingham(COLUMN)clear(COLUMN) 1 p.m.(COLUMN) 57 Brussels(COLUMN)clear(COLUMN) 1 p.m.(COLUMN) 64 Cairo(COLUMN)clear(COLUMN) 2 p.m.(COLUMN) 87 Casablanca(COLUMN)clear(COLUMN) noon(COLUMN) 70 Copenhagen(COLUMN)clear(COLUMN) 1 p.m.(COLUMN) 70 Dublin(COLUMN)pt. cldy.(COLUMN) 1 p.m.(COLUMN) 54 Geneva(COLUMN)pt. cldy.(COLUMN) 1 p.m.(COLUMN) 66 Hong Kong(COLUMN)pt. cldy.(COLUMN) 8 p.m.(COLUMN) 79 Lisbon(COLUMN)cloudy(COLUMN) noon(COLUMN) 61 London(COLUMN)pt. cldy.(COLUMN) 1 p.m.(COLUMN) 66 Madrid(COLUMN)cloudy(COLUMN) 1 p.m.(COLUMN) 64 Malta(COLUMN)clear(COLUMN) 1 p.m.(COLUMN) 77 Manila(COLUMN)cloudy(COLUMN) 8 p.m.(COLUMN) 79 Moscow(COLUMN)cloudy(COLUMN) 3 p.m.(COLUMN) 57 New Delhi(COLUMN)cloudy(COLUMN) 5 p.m.(COLUMN)100 Nice(COLUMN)clear(COLUMN) 1 p.m.(COLUMN) 70 Oslo(COLUMN)clear(COLUMN) 1 p.m.(COLUMN) 75 Paris(COLUMN)clear(COLUMN) 1 p.m.(COLUMN) 70 Peking(COLUMN)cloudy(COLUMN) 8 p.m.(COLUMN) 77 Rome(COLUMN)clear(COLUMN) 1 p.m.(COLUMN) 88 Saigon(COLUMN)clear(COLUMN) 8 p.m.(COLUMN) 86 Sofia(COLUMN)pt. cldy.(COLUMN) 2 p.m.(COLUMN) 63 Stockholm(COLUMN)cloudy(COLUMN) 1 p.m.(COLUMN) 61 Sydney(COLUMN)clear(COLUMN)10 p.m.(COLUMN) 52 Tel Aviv(COLUMN)clear(COLUMN) 2 p.m.(COLUMN) 86 Tokyo(COLUMN)cloudy(COLUMN) 9 p.m.(COLUMN) 66 Tunis(COLUMN)clear(COLUMN) 1 p.m.(COLUMN) 79 Vienna(COLUMN)clear(COLUMN) 1 p.m.(COLUMN) 64 Warsaw(COLUMN)pt. cldy.(COLUMN) 1 p.m.(COLUMN) 61(END TABLE) Temperatures (Western Hemisphere)(TABLE) City(COLUMN)Weather(COLUMN)H.(COLUMN)L. Acapulco(COLUMN)cloudy(COLUMN)90(COLUMN)73 Barbados(COLUMN)cloudy(COLUMN)86(COLUMN)77 Bermuda(COLUMN)pt. cldy.(COLUMN)77(COLUMN)67 Bogata(COLUMN)rain(COLUMN)59(COLUMN)47 Calgary(COLUMN)pt. cldy.(COLUMN)63(COLUMN)45 Culiacan(COLUMN)clear(COLUMN)95(COLUMN)63 Edmonton(COLUMN)cloudy(COLUMN)68(COLUMN)54 Havana(COLUMN)clear(COLUMN)82(COLUMN)72 Kingston(COLUMN)pt. cldy.(COLUMN)88(COLUMN)77 Mexico City(COLUMN)haze(COLUMN)75(COLUMN)55 Monterrey(COLUMN)pt. cldy.(COLUMN)82(COLUMN)72 Montreal(COLUMN)pt. cldy.(COLUMN)88(COLUMN)61 Nassau(COLUMN)pt. cldy.(COLUMN)86(COLUMN)70 Ottawa(COLUMN)pt. cldy.(COLUMN)86(COLUMN)63 Regina(COLUMN)pt. cldy.(COLUMN)81(COLUMN)59 St. Kitts(COLUMN)pt. cldy.(COLUMN)87(COLUMN)73 St. Thomas(COLUMN)pt. cldy.(COLUMN)82(COLUMN)74 Toronto(COLUMN)haze(COLUMN)81(COLUMN)63 Vancouver(COLUMN)cloudy(COLUMN)55(COLUMN)48 Veracruz(COLUMN)pt. cldy.(COLUMN)88(COLUMN)73 Winnipeg(COLUMN)cloudy(COLUMN)75(COLUMN) - (END TABLE) CAPTION: (TABLE) Map, no caption (END TABLE)