Washington: Today - Humid, change of thundershowers, high in the mid 90s, low in the mid 70s. The change of rain is 40 per cent through tonight. Sunday - Humid, change of thundershowers, high in the mid 90s.

Maryland and Virginia: Today - Humid, change of thundershowers, highs from the mid 80s, to the mid 90s, lows from the mid 60s to the mid 70s.

Lower Potomac and Chesapeake Bay: Today - Fair, with a change of thundershowers. Visibility will be from 3 miles to 5 miles. Waves un unprotected waters will be less from the southwest at less than 17 knots.

Atlantic Ocean Beaches from Cape May to Cape Hatteras; Today and Sunday - Sunny, chance thundershowers. Highs will be near 50. Water temperatures will be from the low 70s in the north, to near 80 in the south.

Extended Area Forecast for Monday through Thursday. Partly cloudy through the period, chance of thundershowers on each day. Highs will be from the upper 80s to the mid 90s. Lows from the mid 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, chance of thundershowers, highs from the mid 80s to the mid 90s, lows from the mid 60s to the lows 70s. Sunday - Partly cloudy chance of thundershowers, highs from the mid 80s to the mid 90s. Almanac Data for today - Sun rises 6:13 a.m., sets 8:14 p.m.; moon rises 12:22 a.m., sets 1:36 p.m. Tides: High 1:52 a.m. and 2:05 p.m., low 8:47 a.m. and 8:59 p.m. High and low tides at the following locations can be obtained by subtracting the hours indicated from the tides above Annapolis, [WORD ILLEGIBLE] Bloody Point Lighthouse [WORD ILLEGIBLE] Deale, Md., (4 1/2) Colonial Beach [WORD ILLEGIBLE] Norfolk [WORD ILLEGIBLE] Virginia Beach (1); Solomons Island (6 1/2) Point Lookout (7) Polson count; 6 English Plaintain (note more than 7 or higher is considered undesriable).

The National Weather Forecast for today - Scattered showers and thunderstorms are likely over most of the nation east of the plains and over most of Montana. Temperatures will be seasonably mild from the northern Rocky Mountain region to the upper Great Lakes. Most of the remainder of the nation can expect to be warm to hot.

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 60 for the pollotant, pholochemical oxidants. Indes values between 50 and 99 indicate unhealthy, 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 will be near to 2.7 feet. Local Temp. Humidity(TABLE) Time(COLUMN)T.(COLUMN)H 12 midnite(COLUMN)79(COLUMN)79 1 a.m.(COLUMN)77(COLUMN)82 2 a.m.(COLUMN)76(COLUMN)85 3 a.m.(COLUMN)76(COLUMN)83 4 a.m.(COLUMN)75(COLUMN)91 5 a.m.(COLUMN)76(COLUMN)88 6 a.m.(COLUMN)75(COLUMN)91 7 a.m.(COLUMN)76(COLUMN)88 8 a.m.(COLUMN)77(COLUMN)85 9 a.m.(COLUMN)80(COLUMN)77 10 a.m.(COLUMN)83(COLUMN)70 11 a.m.(COLUMN)87(COLUMN)61 12 noon(COLUMN)88(COLUMN)61 1 p.m.(COLUMN)90(COLUMN)55 2 p.m.(COLUMN)93(COLUMN)51 3 p.m.(COLUMN)92(COLUMN)59 4 p.m.(COLUMN)79(COLUMN)74 5 p.m.(COLUMN)80(COLUMN)67 6 p.m.(COLUMN)85(COLUMN)68 7 p.m.(COLUMN)86(COLUMN)68 8 p.m.(COLUMN)85(COLUMN)68(END TABLE) Temperatures ending 8 a.m. (EDT) Yesterday(TABLE) City(COLUMN)H.(COLUMN)L. Albany(COLUMN)87(COLUMN)71 Alburquerque(COLUMN)96(COLUMN)70 Amarillo(COLUMN)99(COLUMN)69 Anchorage(COLUMN)66(COLUMN)56 Asheville(COLUMN)86(COLUMN)68 Atlanta(COLUMN)83(COLUMN)69 Atlantic City(COLUMN)84(COLUMN)74 Austin(COLUMN)98(COLUMN)75 Baltimore(COLUMN)94(COLUMN)70 Billings(COLUMN)71(COLUMN)52 Birmingham(COLUMN)87(COLUMN)73 Bismarck(COLUMN)78(COLUMN)45 Boise(COLUMN)93(COLUMN)61 Boston(COLUMN)89(COLUMN)70 Brownsville(COLUMN)98(COLUMN)77 Buffalo(COLUMN)74(COLUMN)69 Burlington(COLUMN)86(COLUMN)72 Burlington(COLUMN)86(COLUMN)72 Casper(COLUMN)80(COLUMN)55 Charlton, W.V.(COLUMN)88(COLUMN)71 Charlotte(COLUMN)88(COLUMN)71 Cheyenne(COLUMN)71(COLUMN)53 Chicago(COLUMN)88(COLUMN)70 Cincinnati(COLUMN)91(COLUMN)70 Cleveland(COLUMN)87(COLUMN)68 Columbia, S.C.(COLUMN)35(COLUMN)38 Columbus(COLUMN)90(COLUMN)73 Dal Ft. Worth(COLUMN)98(COLUMN)75 Dayton(COLUMN)91(COLUMN)73 Denver(COLUMN)81(COLUMN)61 Des Moines(COLUMN)88(COLUMN)68 Detroit(COLUMN)92(COLUMN)67 Dulutn(COLUMN)67(COLUMN)58 El Paso(COLUMN)101(COLUMN)71 Flagstaff(COLUMN)82(COLUMN)54 Great Falls(COLUMN)60(COLUMN)51 Hartford(COLUMN)89(COLUMN)68 Helena(COLUMN)68(COLUMN)53 Honolulu(COLUMN)88(COLUMN)76 Houston(COLUMN)93(COLUMN)79 Indianapolis(COLUMN)90(COLUMN)71 Jackson, Miss.(COLUMN)87(COLUMN)70 Jacksonville(COLUMN)93(COLUMN)75 Janqeau(COLUMN)79(COLUMN)49 Kansas City(COLUMN)88(COLUMN)69 Las Vegas(COLUMN)108(COLUMN)80 Little Rock(COLUMN)91(COLUMN)73 Los Angeles(COLUMN)87(COLUMN)65 Louisville(COLUMN)91(COLUMN)73 Memphis(COLUMN)90(COLUMN)76 Miami Beach(COLUMN)90(COLUMN)81 Midland Odessa(COLUMN)103(COLUMN)71 Milwaukee(COLUMN)74(COLUMN)66 Mpls. St. Paul(COLUMN)74(COLUMN)59 Nashville(COLUMN)90(COLUMN)70 New Orleans(COLUMN)81(COLUMN)74 New York(COLUMN)87(COLUMN)74 Norfolk(COLUMN)82(COLUMN)76 North Platte(COLUMN)85(COLUMN)61 Oklahoma City(COLUMN)95(COLUMN)73 Omaha(COLUMN)87(COLUMN)60 Orlando(COLUMN)92(COLUMN)75 Philadelphia(COLUMN)89(COLUMN)71 Phoenix(COLUMN)110(COLUMN)86 Pittsburgh(COLUMN)85(COLUMN)65 Portland, Me.(COLUMN)83(COLUMN)64 Portland, Ore.(COLUMN)85(COLUMN)61 Providence(COLUMN)85(COLUMN)69 Raleigh(COLUMN)88(COLUMN)70 Rpaid City(COLUMN)75(COLUMN)54 Reno(COLUMN)92(COLUMN)47 Richmond(COLUMN)94(COLUMN)72 St. Louis(COLUMN)89(COLUMN)75 St. Prog. Tampa(COLUMN)94(COLUMN)77 Salt Lake City(COLUMN)92(COLUMN)66 San Antonio(COLUMN)94(COLUMN)76 San Diego(COLUMN)80(COLUMN)71 San Francisco(COLUMN)65(COLUMN)55 San Juan(COLUMN)85(COLUMN)76 St. Ste. Marie(COLUMN)75(COLUMN)60 Seattle(COLUMN)85(COLUMN)59 Shreveport(COLUMN)93(COLUMN)73 Sioux Falls(COLUMN)81(COLUMN)59 Spokane(COLUMN)85(COLUMN)47 Syracuse(COLUMN)85(COLUMN)69 Topeka(COLUMN)90(COLUMN)72 Tucson(COLUMN)102(COLUMN)79 Tulsa(COLUMN)95(COLUMN)73 Washington(COLUMN)90(COLUMN)75 Wichita(COLUMN)92(COLUMN)73(END TABLE) Temperatures Abroad Yesterday(TABLE) City(COLUMN)Weather(COLUMN)Time(COLUMN)Temp. Aberdeen(COLUMN)pt. cldy(COLUMN)1 p.m.(COLUMN)55 Amsterdam(COLUMN)clear(COLUMN)1 p.m.(COLUMN)72 Ankara(COLUMN)clear(COLUMN)3 p.m.(COLUMN)82 Athens(COLUMN)clear(COLUMN)2 p.m.(COLUMN)91 Auckland(COLUMN)clear(COLUMN)m n(COLUMN)41 Berlin(COLUMN)clear(COLUMN)1 p.m.(COLUMN)75 Birmingham(COLUMN)cloudy(COLUMN)1 p.m.(COLUMN)61 Brussels(COLUMN)clear(COLUMN)1 p.m.(COLUMN)72 Cairo(COLUMN)clear(COLUMN)2 p.m.(COLUMN)91 Casablanca(COLUMN)clear(COLUMN)noon(COLUMN)75 Copenhagen(COLUMN)clear(COLUMN)1 p.m.(COLUMN)68 Dublin(COLUMN)pt. cldy(COLUMN)1 p.m.(COLUMN)59 Geneva(COLUMN)clear(COLUMN)1 p.m.(COLUMN)75 Hong Kong(COLUMN)pt. cldy(COLUMN)8 p.m.(COLUMN)82 Lisbon(COLUMN)clear(COLUMN)noon(COLUMN)86 London(COLUMN)cloudy(COLUMN)1 p.m.(COLUMN)66 Madrid(COLUMN)clear(COLUMN)1 p.m.(COLUMN)79 Malta(COLUMN)clear(COLUMN)1 p.m.(COLUMN)82 Manila(COLUMN)pt. cldy(COLUMN)8 p.m.(COLUMN)81 Moscow(COLUMN)pt cldy(COLUMN)3 p.m.(COLUMN)86 New Delhi(COLUMN)cloudy(COLUMN)5 p.m.(COLUMN)86 Nice(COLUMN)pt. cldy(COLUMN)1 p.m.(COLUMN)77 Oslo(COLUMN)cloudy(COLUMN)1 p.m.(COLUMN)68 Paris(COLUMN)clear(COLUMN)1 p.m.(COLUMN)77 Rome(COLUMN)cloudy(COLUMN)1 p.m.(COLUMN)79 Saigon(COLUMN)cloudy(COLUMN)8 p.m.(COLUMN)77 Stockholm(COLUMN)pt cldy(COLUMN)1 p.m.(COLUMN)66 Sydney(COLUMN)pt. cldy(COLUMN)10 p.m.(COLUMN)59 Tel Aviv(COLUMN)clear(COLUMN)2 p.m.(COLUMN)88 Tokyo(COLUMN)clear(COLUMN)9 p.m.(COLUMN)86 Tunis(COLUMN)cleat(COLUMN)1 p.m.(COLUMN)84 Vienna(COLUMN)pt. cldy(COLUMN)1 p.m.(COLUMN)77 Warsaw(COLUMN)rain(COLUMN)1 p.m.(COLUMN)66(END TABLE) Temperatures (Western Hemisphere)(TABLE) City(COLUMN)Weather(COLUMN)High(COLUMN)Low Acapulco(COLUMN)cloudy(COLUMN)91(COLUMN)76 Barbabos(COLUMN)pt. cldy(COLUMN)82(COLUMN)77 Bermuda(COLUMN)fair(COLUMN)88(COLUMN)80 Montego Bay(COLUMN)fair(COLUMN)90(COLUMN)77 Havana(COLUMN)pt. cldy(COLUMN)90(COLUMN)73 Kingston(COLUMN)fair(COLUMN)90(COLUMN)76 Monteno Bay(COLUMN)fair(COLUMN)90(COLUMN)76 Mexico City(COLUMN)cloudy(COLUMN)81(COLUMN)51 Nassau(COLUMN)pt. cldy(COLUMN)90(COLUMN)76 St. Kitts(COLUMN)pt. cldy(COLUMN)89(COLUMN)65 Veracruz(COLUMN)pt. cldy(COLUMN)90(COLUMN)76(END TABLE)