Washington: Today - Fair, high near 80, low in low to mid 60s. Chance of rain near zero through tonight. Saturday - Partly cloudy, high near 80.

Maryland and Virginia: Today - Fair, highs in 70s, lows from 50s west to 60s in east. Saturday - Partly cloudy, highs in 70s.

Lower Potomac and Chesapeake Bay: Today - Fair skies with good visibility and northeasterly winds at 8 to 12 knots through tonight.

Extended Area Outlook: For Sunday through Tuesday - Warming trend through period. Sunday's temperatures from highs in 70s to lows in 60s to Tuesday's high in mid to upper 80s and low near 70. Humid with chance of afternoon and evening showers on Monday and Tuesday. Washington's normal temperature range for this time of year is from 86 to 67.

West Virginia: Today - Sunny, highs in 70s, lows in upper 40s to near 60. Saturday - Partly cloudy, high in 70s.

Atlantic Ocean Beaches from Case May through Maryland; Today and Saturday - Partly cloudy, highs in mid to upper 70s. Water temperatures should be in low to mid 70s.

Atlantic Ocean Beaches from Cape Hafferas through Virginia: Today and Saturday - Partly cloudy, highs in mid to upper 70s, chance of rain Saturday. Water temperatures should be in miod 70s to low 80s.

The National Weather Forecast for today - Showers and thunder-showers will occur along the Carolina and Georgia coasts while the scattered variety are possible for the central Carolinas, Florida, the Gulf Coast through the central and southern Rockies and the Great Basin. Temperatures will cool slightly from the very hot readings of recent days in Oregon and Washington and continue pleasant in the midwest and northeast. Elsewhere, seasonable readings are enticipated.

ALMANAC DATA for Aug. 19: Sun rises 6:25 a.m., sets 7:58 P.m.; moon rises 10:22 sets 9:39. Tides: High 11:48 a.m. and 11:19 p.m., low 5:22 a.m. and 8:27 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); Deal, Md. (4 1/2); Colonial Beach (6); Norfolk (1 1/2); Virginia Beach (1); Solomans Island (6 1/2); Point Lookout (7). Pollen count: 20 (note: 7 or higher is considered undesirable.).

The Council of Government's Air Quality Index for yesterday showed the high reading in the Washington Area during the 2 to 3 p.m. period was 70 for the pollutant photohcemical oxidants. Index values between 50 and 99 indicate unhealthy air quality. When the index exceeds 100, the air is considered hazardous, and individuals with lung, heart and eye ailments are urged to restrict their activity.

The National Weather Service forcasts the Potomac River stage at Little Falls will be near 2.8 feet today. Local Temp., Humidity(TABLE) Time(COLUMN)T.(COLUMN)H. 12 mid.(COLUMN)74(COLUMN)62 1 a.m.(COLUMN)73(COLUMN)64 2 a.m.(COLUMN)72(COLUMN)68 3 a.m.(COLUMN)71(COLUMN)71 4 a.m.(COLUMN)70(COLUMN)73 5 a.m.(COLUMN)69(COLUMN)76 6 a.m.(COLUMN)68(COLUMN)79 7 a.m.(COLUMN)67(COLUMN)81 8 a.m.(COLUMN)68(COLUMN)78 8 a.m.(COLUMN)71(COLUMN)68 10 a.m.(COLUMN)71(COLUMN)68 11 a.m.(COLUMN)73(COLUMN)64 12 noon(COLUMN)74(COLUMN)62 1 p.m.(COLUMN)76(COLUMN)54 2 p.m.(COLUMN)76(COLUMN)50 3 p.m.(COLUMN)76(COLUMN)52 4 p.m.(COLUMN)77(COLUMN)43 5 p.m.(COLUMN)76(COLUMN)48 6 p.m.(COLUMN)77(COLUMN)45(END TABLE) Temperatures ending 8 a.m. (EDT) Yesterday(TABLE) CIty(COLUMN)H.(COLUMN)L. Albany(COLUMN)79(COLUMN)52 Albuquerque(COLUMN)88(COLUMN)65 Amerillo(COLUMN)78(COLUMN)67 Asheville(COLUMN)83(COLUMN)67 Atlanta(COLUMN)88(COLUMN)69 Atlantic City(COLUMN)91(COLUMN)65 Austin(COLUMN)100(COLUMN)77 Baltimore(COLUMN)86(COLUMN)64 Billings(COLUMN)86(COLUMN)59 Birmingham(COLUMN)91(COLUMN)76 Bismarck(COLUMN)76(COLUMN)48 Boise(COLUMN)93(COLUMN)75 Boston(COLUMN)81(COLUMN)63 Brownsville(COLUMN)97(COLUMN)75 Buffalo(COLUMN)73(COLUMN)51 Burlington, Vt.(COLUMN)72(COLUMN)59 Casper(COLUMN)85(COLUMN)67 Charlton, S.C.(COLUMN)90(COLUMN)80 Charlton, W.Va.(COLUMN)78(COLUMN)59 Chevenne(COLUMN)63(COLUMN)59 Chicago(COLUMN)77(COLUMN)55 Cincinnati(COLUMN)79(COLUMN)57 Celveland(COLUMN)72H$56 Columbia, S.C.(COLUMN)91(COLUMN)73 Columbus, Ohio(COLUMN)76(COLUMN)50 Del.-Ft. Worth(COLUMN)102(COLUMN)74 Dayton(COLUMN)76(COLUMN)51 Denver(COLUMN)74(COLUMN)63 Des Moines(COLUMN)78(COLUMN)50 Detroit(COLUMN)79(COLUMN)46 Duluth(COLUMN)64(COLUMN)43 El Paso(COLUMN)95(COLUMN)75 Fargo(COLUMN)68(COLUMN)48 Flagstaff(COLUMN)75(COLUMN)53 Great Falls(COLUMN)86(COLUMN)52 Hartford(COLUMN)78(COLUMN)55 Helena(COLUMN)90(COLUMN)57 Honolulu(COLUMN)89(COLUMN)78 Houston(COLUMN)95(COLUMN)81 Indianapolis(COLUMN)80(COLUMN)54 Jackson, Miss.(COLUMN)92(COLUMN)75 Jacksonville(COLUMN)92(COLUMN)74 Kansas City(COLUMN)78(COLUMN)59 Las Vegas(COLUMN)87(COLUMN)72 Little Rock(COLUMN)85(COLUMN)65 Los Angeles(COLUMN)74(COLUMN)70 Louisville(COLUMN)80(COLUMN)61 Memphis(COLUMN)87(COLUMN)69 Miami Beach(COLUMN)83(COLUMN)80 Midland(COLUMN)101(COLUMN)71 Milwaukee(COLUMN)72(COLUMN)52 Mpls.-St. Paul(COLUMN)69(COLUMN)47 Nashville(COLUMN)81(COLUMN)64 New Orleans(COLUMN)89(COLUMN)76 New York(COLUMN)82(COLUMN)64 Norfolk(COLUMN)93(COLUMN)70 North Platte(COLUMN)77(COLUMN)62 Oklahoma City(COLUMN)82(COLUMN)69 Omaha(COLUMN)76(COLUMN)55 Orlando(COLUMN)91(COLUMN)74 Phoenix(COLUMN)100(COLUMN)84 Pittsburgh(COLUMN)73(COLUMN)51 Portland, Me.(COLUMN)77(COLUMN)56 Portland, Ore.(COLUMN)105(COLUMN)61 Providence(COLUMN)79(COLUMN)60 Raleigh(COLUMN)91(COLUMN)67 Rapid City(COLUMN)79(COLUMN)57 Reno(COLUMN)78(COLUMN)58 Richmond(COLUMN)96(COLUMN)69 St. Louis(COLUMN)80(COLUMN)56 St. Prbg. Tampa(COLUMN)91(COLUMN)77 Salt Lake City(COLUMN)79H(COLUMN)66 San Antonia(COLUMN)95(COLUMN)75 San Diego(COLUMN)74(COLUMN)69 San Francisco(COLUMN)66(COLUMN)59 San Juan, P.R.(COLUMN)87(COLUMN)75 St. Ste. Marie(COLUMN)61(COLUMN)42 Seattle(COLUMN)96(COLUMN)58 Shreveport(COLUMN)90(COLUMN)74 Sioux Falls(COLUMN)72(COLUMN)53 Spokane(COLUMN)98(COLUMN)62 Syracuse(COLUMN)74(COLUMN)45 Topeka(COLUMN)82(COLUMN)60 Tucson(COLUMN)94(COLUMN)78 Tulsa(COLUMN)80(COLUMN)62 Washington(COLUMN)89(COLUMN)67 Wichita(COLUMN)80(COLUMN)64(END TABLE) Temperatures Abroad Yesterday(TABLE) CIty(COLUMN)Weather(COLUMN)Time(COLUMN)Temp Aberdeen(COLUMN)cloudy(COLUMN)1 p.m.(COLUMN)55 Amsterdam(COLUMN)rain(COLUMN)1 p.m.(COLUMN)59 Ankara(COLUMN)clear(COLUMN)3 p.m.(COLUMN)72 Athens(COLUMN)clear(COLUMN)2 p.m.(COLUMN)86 Auckland(COLUMN)clear(COLUMN)midnight#H52 Berlin(COLUMN)cloudy(COLUMN)1 p.m.(COLUMN)61 Birmingham(COLUMN)drizzle(COLUMN)1 p.m.(COLUMN)57 Brussels(COLUMN)cloudy(COLUMN)1 p.m.(COLUMN)63 Cairo(COLUMN)clear(COLUMN)2 p.m.(COLUMN)91 Casablanca(COLUMN)pt. cldy(COLUMN)noon(COLUMN)72 Copenhagen(COLUMN)clear(COLUMN)1 p.m.(COLUMN)70 Dublin(COLUMN)cloudy(COLUMN)1 p.m.(COLUMN)59 Geneva(COLUMN)pt. cldy(COLUMN)1 p.m.(COLUMN)70 Hong Kong(COLUMN)pt. cldy(COLUMN)8 p.m.(COLUMN)84 Lisbon(COLUMN)pt. cldy(COLUMN)noon(COLUMN)72 London(COLUMN)cloudy(COLUMN)1 p.m.(COLUMN)59 Madrid(COLUMN)pt. cldy(COLUMN)1 p.m.(COLUMN)75 Malta(COLUMN)clear(COLUMN)1 p.m.(COLUMN)86 Manila(COLUMN)rain(COLUMN)8 p.m.(COLUMN)79 Moscow(COLUMN)cloudy(COLUMN)3 p.m.(COLUMN)57 Nice(COLUMN)cloudy(COLUMN)1 p.m.(COLUMN)77 Oslo(COLUMN)clear(COLUMN)1 p.m.(COLUMN)75 Paris(COLUMN)cloudy(COLUMN)1 p.m.(COLUMN)61 Peking(COLUMN)clear(COLUMN)8 p.m.(COLUMN)75 Rome(COLUMN)cloudy(COLUMN)1 p.m.(COLUMN)81 Saigon(COLUMN)rain(COLUMN)8 p.m.(COLUMN)79 Sofia(COLUMN)clear(COLUMN)2 p.m.(COLUMN)79 Stockholm(COLUMN)pt.cldy(COLUMN)1 p.m.(COLUMN)66 Sydney(COLUMN)clear(COLUMN)10 p.m.(COLUMN)57 Tel Aviv(COLUMN)clear(COLUMN)2 p.m.(COLUMN)88 Tokyo(COLUMN)pt. cldy(COLUMN)9 p.m.(COLUMN)77 Tunis(COLUMN)rain(COLUMN)1 p.m.(COLUMN)97 Vienna(COLUMN)clear(COLUMN)1 p.m.(COLUMN)79 Warsaw(COLUMN)pt. cldy(COLUMN)1 p.m.(COLUMN)66(END TABLE) Temperatures (Western Hemisphere)(TABLE) City(COLUMN)Weather(COLUMN)Time(COLUMN)Temp. Acapulco(COLUMN)pt. cldy(COLUMN)90(COLUMN)78 Barbados(COLUMN)pt. cldy(COLUMN)86(COLUMN)76 Bermuda(COLUMN)rain(COLUMN)89(COLUMN)80 Bogota(COLUMN)pt. cldy(COLUMN)66(COLUMN)40 Calgery(COLUMN)clear(COLUMN)77(COLUMN)48 Cutiacan(COLUMN)pt. cldy(COLUMN)95(COLUMN)77 Edmonton(COLUMN)rain(COLUMN)79(COLUMN)50 Kingston(COLUMN)cloudy(COLUMN)91(COLUMN)79 Montego Bay(COLUMN)pt. cldy(COLUMN)90(COLUMN)77 Mexoco City(COLUMN)fair(COLUMN)79(COLUMN)54 Montgerrey(COLUMN)pt. cldy(COLUMN)98(COLUMN)74 Montreal(COLUMN)cloudy(COLUMN)68(COLUMN)55 Nassau(COLUMN)pt. cldy(COLUMN)88(COLUMN)76 Ottawa(COLUMN)pt. cldy(COLUMN)70(COLUMN)48 Regina(COLUMN)clear(COLUMN)73(COLUMN)46 St. Kitts(COLUMN)cloudy(COLUMN)88(COLUMN)74 Toronto(COLUMN)clear(COLUMN)70(COLUMN)48 Veracruz(COLUMN)pt. cldy(COLUMN)86(COLUMN)74 Winnipeg(COLUMN)clear(COLUMN)64(COLUMN)41(END TABLE)