Washington: Today - Partly cloudy, high near 100, low in the mid 70s. The chance of rain is 29 per cent today and 10 per cent tonight. Friday - partly cloudy, high near 100.

Maryland and Virginia: Today - Partly cloudy, highs from the mid 80s to the 90s, lows in the 70s. Friday - Partly cloudy, highs from the mid 80s to the 90s.

Lower Potomac and Chesapeake Bay: Today: Partly cloudy, chance of afternoon thunderstorms. Wind will be from the south at less than 15 knots. Visibility will be more than 5 miles. Waves in unprotected waters will be near 1 foot.

Atlantic Ocean Beaches from Cape May to Cape Hatteras: Today and Friday - partly cloudy, hot and humid, highs will be from the mid 80s to the 90s. Water temperatures will range from the near 70s to the mid 70s.

Extended Area Forecast for Saturday through Monday: Fair through the period; little or no rain expected. Highs will be from the mid 80s to the mid 90s, lows from the 60s to the mid 70s. Normal Washington temperatures for the period are a high of 88 and a low of 69.

West Virginia: Today - partly cloudy, highs from the mid 80s to the upper 90s, low from the 60s to the mid 70s. Friday - partly cloudy, highs from the mid 80s to the upper 90s. There is a chance of afternoon or evening thundershowers on each day.

The National Weather Forecast for today - Scattered showers and thunderstorms are likely across western New York and from Lake Michigan to the Atlantic ranging from Virginia into southern New England. Showers and thunderstorms will also be scattered widely along the Gulf coast from Texas across Florida. Mild temperatures will cover the northern Rockies and the central and northern intermountain regions. A warming trend will begin in western Washington, The rest of the nation will have warm to hot temperatures. Very hot readings will be found in eastern Nebraska, northern Indiana and northern Ohio.

Almanac data for Today - Sun rises 5:50 a.m., sets 8:36 p.m.; moon rises 12:41 a.m., sets 12:55 p.m. Tides: High 1:44 a.m. and 1:57 p.m., low 8:29 a.m. and 8:47 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); Blody 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 Lockout (7), Pollen count: 48 grass (note: 7 or higher is considered undesirable).

The Council of Government' Air Quality Index for yesterday showed the high reading in the Washington area during the 2 p.m. to 3 p.m. period was 120 for the pollutant, photochemical oxidents. When the index exceeds 100 the air becomes hazardous and persons with lung, heart and eye problems should restrict their activity. The air pollution alert will continue through today.

The National Weather Service forcasts that the Potomac River stage of Little Falls will be near 2.8 feet. Local Temp., Humidity(TABLE) Times(COLUMN)T.(COLUMN)H. 12mid(COLUMN)89(COLUMN)60 1 a.m.(COLUMN)88(COLUMN)62 3 a.m.(COLUMN)86(COLUMN)684 4 a.m.(COLUMN)84(COLUMN)72 5 a.m.(COLUMN)82(COLUMN)77 6 a.m.(COLUMN)80(COLUMN)76 7 a.m.(COLUMN)82(COLUMN)77 8 a.m.(COLUMN)85(COLUMN)70 9 a.m.(COLUMN)38(COLUMN)64 10 a.m.(COLUMN)90(COLUMN)60 11 a.m.(COLUMN)91(COLUMN)58 12 noon(COLUMN)93(COLUMN)54 1 p.m.(COLUMN)95(COLUMN)51 2 p.m.(COLUMN)58(COLUMN)47 3 P.m.(COLUMN)100(COLUMN)43 4 P.m.(COLUMN)98(COLUMN)45 5 P.m.(COLUMN)98(COLUMN)43 6 P.m.(COLUMN)96(COLUMN)51 7 P.m.(COLUMN)95(COLUMN)60(END TABLE) Temperatures ending 8 a.m. (EDT) Yesterday(TABLE) City(COLUMN)H.(COLUMN)L. Abany(COLUMN)89(COLUMN)56 Alburquerque(COLUMN)89(COLUMN)65 Amanilo(COLUMN)93(COLUMN)71 Anchorage(COLUMN)65(COLUMN)54 Asheville(COLUMN)86(COLUMN)63 Atlanta(COLUMN)92(COLUMN)72 Atlantic City(COLUMN)89(COLUMN)72 Austin(COLUMN)54(COLUMN)73 Baltimore(COLUMN)79(COLUMN)75 Billings(COLUMN)85(COLUMN)54 Birmingham(COLUMN)99(COLUMN)73 Bismarck(COLUMN)86(COLUMN)65 Boise(COLUMN)78(COLUMN)50 Boston(COLUMN)92(COLUMN)64 Brownsville(COLUMN)92(COLUMN)73 Buffalo(COLUMN)81 70 Burlington(COLUMN)82(COLUMN)48 Casper(COLUMN)86(COLUMN)63 Charleston, S.C.(COLUMN)86(COLUMN)79 Charleston, W. Va(COLUMN)92(COLUMN)75 Charlotte(COLUMN)96(COLUMN)76 Chevenne(COLUMN)80(COLUMN)52 Chicago(COLUMN)97(COLUMN)80 Cincinnati(COLUMN)94(COLUMN)72 Cleveland(COLUMN)90(COLUMN)49 Columbia, S.C(COLUMN)99(COLUMN)71 Columbus(COLUMN)95(COLUMN)71 Del-Ft Worth(COLUMN)111(COLUMN)74 Devton(COLUMN)96(COLUMN)70 Denver(COLUMN)90(COLUMN)59 Des Molnes(COLUMN)102(COLUMN)78 Detroit(COLUMN)96(COLUMN)74 Duluth(COLUMN)80(COLUMN)56 El Paso(COLUMN)90(COLUMN)69 Fairbanks(COLUMN)72(COLUMN)48 Fargo(COLUMN)38(COLUMN)67 Flagstaff(COLUMN)78(COLUMN)43 Great Falls(COLUMN)79(COLUMN)49 Hartford(COLUMN)92(COLUMN)61 Helena(COLUMN)75(COLUMN)48 Honolulu(COLUMN)87(COLUMN)74 Houston(COLUMN)92(COLUMN)80 Indianapolis(COLUMN)93(COLUMN)73 Jackson, Miss.(COLUMN)97(COLUMN)72 Jacksonville(COLUMN)92(COLUMN)70 Juneau(COLUMN)66(COLUMN)46 Kansas City(COLUMN)94(COLUMN)76 Las Vegas(COLUMN)111(COLUMN)70 Little Rock(COLUMN)96(COLUMN)75 Los Angeles(COLUMN)79(COLUMN)62 Louisville(COLUMN)94(COLUMN)72 Memphis(COLUMN)98(COLUMN)79 Miami Beach(COLUMN)85(COLUMN)77 Midland-Odessa(COLUMN)99(COLUMN)67 Milwaukee(COLUMN)93(COLUMN)79 Mpis-St. Paul(COLUMN)96(COLUMN)74 Nashville(COLUMN)93(COLUMN)72 New Orleans(COLUMN)92(COLUMN)73LNew York 94(COLUMN)72 Norfolk(COLUMN)96(COLUMN)79 North Platte(COLUMN)85(COLUMN)63 Oklahoma City(COLUMN)92(COLUMN)70 Orlando(COLUMN)90(COLUMN)71 Philadelphia(COLUMN)91(COLUMN)75 Phoenix(COLUMN)105(COLUMN)82 Pittsburgh(COLUMN)87(COLUMN)65 Portland, Maine(COLUMN)85(COLUMN)56 Portland, Ore(COLUMN)68(COLUMN)49 Providence(COLUMN)91(COLUMN)64 Raleigh(COLUMN)95(COLUMN)71 Rapid City(COLUMN)83(COLUMN)62 Reno(COLUMN)83(COLUMN)39 Richmond(COLUMN)97(COLUMN)76 St. Louis(COLUMN)97(COLUMN)78 St. Prbg-Tampa(COLUMN)89(COLUMN)74 Salt Lake City(COLUMN)92(COLUMN)69 San Antonio(COLUMN)92(COLUMN)76 San Diego(COLUMN)73(COLUMN)61 San Francisco(COLUMN)67(COLUMN)52 San Juan(COLUMN)87(COLUMN)74 St. Ste. Marle(COLUMN)79(COLUMN)61 Seattle(COLUMN)68(COLUMN)53 Streveport(COLUMN)99(COLUMN)69 Soux Falls(COLUMN)101(COLUMN)75 Spokane(COLUMN)66(COLUMN)43 Syracuse(COLUMN)84(COLUMN)57 Tpoeka(COLUMN)92(COLUMN)73 Tucson(COLUMN)99(COLUMN)75 Tulsa(COLUMN)97(COLUMN)77 Washington(COLUMN)98(COLUMN)80 Witchita(COLUMN)99(COLUMN)74(END TABLE) Temperatures Abroad Yesterday(TABLE) City(COLUMN)Weather(COLUMN)Time(COLUMN)Temp. Aberdeen(COLUMN)clear(COLUMN)1 p.m.(COLUMN)81 Amsterdam(COLUMN)clear(COLUMN)1 p.m.(COLUMN)77 Ankara(COLUMN)clear(COLUMN)3 p.m.(COLUMN)85 Athens(COLUMN)clear(COLUMN)2 p.m.(COLUMN)86 Auckland(COLUMN)clear(COLUMN)midn.(COLUMN)47 Berlin(COLUMN)rain(COLUMN)1 p.m.(COLUMN)73 Birmingham(COLUMN)clear(COLUMN)1 p.m.(COLUMN)75 Brussels(COLUMN)clear(COLUMN)1 p.m.(COLUMN)77 Cairo(COLUMN)clear(COLUMN)2 p.m.(COLUMN)91 Casablanca(COLUMN)clear(COLUMN)noon(COLUMN)73 Copenhagen(COLUMN)cloudy(COLUMN)2 p.m.(COLUMN)91 Dublin(COLUMN)clear(COLUMN)1 p.m.(COLUMN)66 Geneva(COLUMN)clear(COLUMN)1 p.m.(COLUMN)67 Hong Kong(COLUMN)cloudy(COLUMN)8 p.m.(COLUMN)81 Lisbon(COLUMN)pt. cldy(COLUMN)1 p.m.(COLUMN)77 Madrid(COLUMN)pt. cldy(COLUMN)1 p.m.(COLUMN)75 Malta(COLUMN)clear(COLUMN)1 p.m.(COLUMN)90 Manila(COLUMN)pt. Cldy(COLUMN)8 p.m.(COLUMN)81 Moscow(COLUMN)cloudy(COLUMN)3 a.m.(COLUMN)73 New Delhi(COLUMN)cloudy(COLUMN)5 p.m.(COLUMN)84 Nice(COLUMN)clear(COLUMN)1 p.m.(COLUMN)77 Oslo(COLUMN)clear(COLUMN)1 p.m.(COLUMN)82 Paris(COLUMN)clear(COLUMN)1 p.m.(COLUMN)81 Peking(COLUMN)cloudy(COLUMN)8 p.m.(COLUMN)72 Rome(COLUMN)clear(COLUMN)1 p.m.(COLUMN)81 Saigon(COLUMN)cloudy(COLUMN)8 p.m.(COLUMN)77 Sofia(COLUMN)cloudy(COLUMN)2 p.m.(COLUMN)73 Stockholm(COLUMN)cloudy(COLUMN)1 p.m.(COLUMN)61 Sydney(COLUMN)clear(COLUMN)10 p.m.(COLUMN)54 Tel Aviv(COLUMN)clear(COLUMN)2 p.m.(COLUMN)88 Tokyo(COLUMN)cloudy(COLUMN)9 p.m.(COLUMN)73 Tunis(COLUMN)clear(COLUMN)1 p.m.(COLUMN)82 Venice(COLUMN)cloudy(COLUMN)1 p.m.(COLUMN)72 Warsaw(COLUMN)rain(COLUMN)1 p.m.(COLUMN)59(END TABLE)