Washington: Today - Warn and humid with a chance of a thundershower, high near 80, low in the upper 60s. The chance of rain is 40 per cent today and 20 per cent tonight. Friday - Continued warm and humid, high in the mid 80s.

Maryland: Today - Warm and humid with a chance of a thundershower, high near 80, low in the low 60s. Friday - Continued warm and humid, high in the 80s.

Virginia: Today - Warm and humid with a chance of a thundershower, high near 80, low in the low 60s. Friday - Continued warm and humid, high in the 80s.

Extended Area Forecase for Saturday through Monday - Variable cloudiness with showers through the period. Highs will average near 80, lows near 60. Normal Washington temperatures for the period are a high of 74 and a low of 53.

The National Weather Forecast for today - Except in the eastern and central Gulf states and Tennessee, showers and thunderstorms will be scattered from the Atlantic Coast through the Mississippi Valley region into eastern Texas. Showers will also be scattered over northern California and the Pacific Northwest into the northern Rockies. The remainder of the nation will be partly cloudy. It will continue to be cool west of the Rockies and the northern Plains. It will also be cool along the north Atlantic Coast, but warm in much of the Ohio Valley region. The rest of the nation will have seasonably mild readings.

ALMANAC DATA FOR MAY 5, 1977

Sun rises 6:06 a.m., sets 8:04 p.m.; moon rises 10:42 p.m. sets 7:59 a.m. Tides: High 10:14 a.m. and 10:45 p.m. Low 4:28 a.m. and 5:11 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).

The Council of Governments' Air Quality Index for yesterday showed the high reading in the Washington area during the 3 p.m. period was 25 for the pollutant, photochemical oxidants. Index values between 25 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 will remain near 3.6 feet today.

Lower Potomac and Chesapeake Bay: Today - partly cloudy with a chance of thundershowers. Visibility will be less than 5 miles. Winds will be from the southwest at 15 to 20 knots.

West Virginia: Today - Partly cloudy through Friday with a chance of showers or thundershowers, highs both days will range from the mid 70s to the mid 80s, lows from the upper 50s to mid 60s. Local Temp., Humidity(TABLE) Time(COLUMN)T.(COLUMN)H. 12 m'dn't(COLUMN)65(COLUMN) 56 1 a.m.(COLUMN)65(COLUMN) 50 2 a.m.(COLUMN)64(COLUMN) 68 3 a.m.(COLUMN)62(COLUMN) 87 4 a.m.(COLUMN)60(COLUMN)100 5 a.m.(COLUMN)60(COLUMN)100 6 a.m.(COLUMN)61(COLUMN) 97 7 a.m.(COLUMN)61(COLUMN) 97 8 a.m.(COLUMN)61(COLUMN) 93 9 a.m.(COLUMN)63(COLUMN) 93 10 a.m.(COLUMN)64(COLUMN) 93 11 a.m.(COLUMN)65(COLUMN) 90 12 noon(COLUMN)65(COLUMN) 90 1 p.m.(COLUMN)65(COLUMN) 90 2 p.m.(COLUMN)66(COLUMN) 90 3 p.m.(COLUMN)66(COLUMN) 90 4 p.m.(COLUMN)66(COLUMN) 90 5 p.m.(COLUMN)66(COLUMN) 90 6 p.m.(COLUMN)65(COLUMN) 93 7 p.m.(COLUMN)65(COLUMN) 93(END TABLE) Temperatures ending 8 a.m. (EDT) yesterday:(TABLE) City(COLUMN)H.(COLUMN)L. Albany(COLUMN)64(COLUMN)31 Alburquerque(COLUMN)76(COLUMN)51 Amarillo(COLUMN)79(COLUMN)59 Anchorage(COLUMN)54(COLUMN)43 Asheville(COLUMN)75(COLUMN)60 Atlanta(COLUMN)30(COLUMN)58 Atlantic City(COLUMN)65(COLUMN)48 Austin(COLUMN)31(COLUMN)69 Baltimore(COLUMN)77(COLUMN)55 Billings(COLUMN)72(COLUMN)47 Birmingham(COLUMN)76(COLUMN)66 Bismarck(COLUMN)81(COLUMN)60 Boise(COLUMN)59(COLUMN)36 Boston(COLUMN)68(COLUMN)44 Brownsville(COLUMN)87(COLUMN)74 Buffalo(COLUMN)60(COLUMN)42 Burlington, Vt.(COLUMN)55(COLUMN)31 Casper(COLUMN)73(COLUMN)49 Charleston, S.C.(COLUMN)83(COLUMN)66 Charleston, WV(COLUMN)75(COLUMN)62 Charlotte(COLUMN)81(COLUMN)60 Cheyenne(COLUMN)68(COLUMN)43 Chicago(COLUMN)67(COLUMN)54 Cincinnati(COLUMN)73(COLUMN)62 Cleveland(COLUMN)64(COLUMN)52 Columbia, S.C.(COLUMN)88(COLUMN)59 Columbus(COLUMN)75(COLUMN)61 Dal.-Ft. Worth(COLUMN)87(COLUMN)72 Dayton(COLUMN)75(COLUMN)62 Denver(COLUMN)30(COLUMN)50 Des Moines(COLUMN)68(COLUMN)61 Detroit(COLUMN)45(COLUMN)45 Duluth(COLUMN)62(COLUMN)42 El Paso(COLUMN)84(COLUMN)65 Fairbanks(COLUMN)55(COLUMN)42 Fargo(COLUMN)77(COLUMN)60 Flagstaff(COLUMN)66(COLUMN)33 Great Falls(COLUMN)68(COLUMN)43 Hartford(COLUMN)78(COLUMN)39 Helena(COLUMN)63(COLUMN)39 Honolulu(COLUMN)84(COLUMN)71 Houston(COLUMN)83(COLUMN)71 Indianapolis(COLUMN)72(COLUMN)63 Jackson(COLUMN)85(COLUMN)71 Jacksonville(COLUMN)85(COLUMN)69 Juneau(COLUMN)51(COLUMN)42 Kansas City(COLUMN)70(COLUMN)66 Las Vegas(COLUMN)83(COLUMN)55 Little Rock(COLUMN)81(COLUMN)67 Los Angeles(COLUMN)57(COLUMN)70 Louisville(COLUMN)73(COLUMN)64 Memphis(COLUMN)81(COLUMN)68 Miami Beach(COLUMN)78(COLUMN)69 Midland(COLUMN)82(COLUMN)63 Milwaukee(COLUMN)51(COLUMN)44 Mpls.-St. Paul(COLUMN)68(COLUMN)56 Nashville(COLUMN)78(COLUMN)65 New Orleans(COLUMN)82(COLUMN)63 New York(COLUMN)72(COLUMN)47 Norfolk(COLUMN)80(COLUMN)62 North Platte(COLUMN)74(COLUMN)56 Oklahoma City(COLUMN)84(COLUMN)62 Omaha(COLUMN)73(COLUMN)64 Orlando(COLUMN)87(COLUMN)64 Philadelphia(COLUMN)75(COLUMN)51 Phoenix(COLUMN)93(COLUMN)63 Pittsburgh(COLUMN)66(COLUMN)53 Portland, Me.(COLUMN)59(COLUMN)29 Portland, Ore.(COLUMN)58(COLUMN)44 Providence(COLUMN)69(COLUMN)43 Raleigh(COLUMN)81(COLUMN)60 Rapid City(COLUMN)83(COLUMN)55 Reno(COLUMN)58(COLUMN)27 Richmond(COLUMN)82(COLUMN)62 St. Louis(COLUMN)71(COLUMN)56 St. Prbg.-T'mpa(COLUMN)90(COLUMN)69 Salt Lake City(COLUMN)78(COLUMN)42 San Antonio(COLUMN)83(COLUMN)70 San Diego(COLUMN)67(COLUMN)60 San Francisco(COLUMN)59(COLUMN)51 San Juan(COLUMN)85(COLUMN)73 St. Ste. Marie(COLUMN)57(COLUMN)33 Seattle(COLUMN)58(COLUMN)44 Shreveport(COLUMN)87(COLUMN)68 Sioux Falls(COLUMN)64(COLUMN)60 Spokane(COLUMN)53(COLUMN)35 Syracuse(COLUMN)56(COLUMN)33 Topeka(COLUMN)83(COLUMN)69 Tucson(COLUMN)35(COLUMN)55 Tulsa(COLUMN)85(COLUMN)70 Washington(COLUMN)78(COLUMN)59 Wichita(COLUMN)81(COLUMN)62(END TABLE) Temperatures Abroad Yesterday(TABLE) City(COLUMN)Weather(COLUMN)Time(COLUMN)Temp. Aberdeen(COLUMN)haze(COLUMN) 1 p.m.(COLUMN)52 Amsterdam(COLUMN)cloudy(COLUMN) 1 p.m.(COLUMN)50 Ankara(COLUMN)rain(COLUMN) 3 p.m.(COLUMN)57 Athens(COLUMN)pt. cldy.(COLUMN) 2 p.m.(COLUMN)82 Auckland(COLUMN)clear(COLUMN)midnight(COLUMN)48 Berlin(COLUMN)pt. cldy.(COLUMN) 1 p.m.(COLUMN)81 Birmingham(COLUMN)cloudy(COLUMN) 1 p.m.(COLUMN)52 Brussels(COLUMN)cloudy(COLUMN) 1 p.m.(COLUMN)45 Cairo(COLUMN)clear(COLUMN) 2 p.m.(COLUMN)81 Casablanca(COLUMN)clear(COLUMN)noon(COLUMN)63 Copenhagen(COLUMN)cloudy(COLUMN) 1 p.m.(COLUMN)59 Dublin(COLUMN)pt. cldy.(COLUMN)1 p.m.(COLUMN)54 Geneva(COLUMN)rain(COLUMN) 1 p.m.(COLUMN)55 Hong Kong(COLUMN)clear(COLUMN) 8 p.m.(COLUMN)81 Lisbon(COLUMN)pt. cldy.(COLUMN)noon(COLUMN)61 London(COLUMN)cloudy(COLUMN) 1 p.m.(COLUMN)55 Madrid(COLUMN)pt. cldy.(COLUMN) 1 p.m.(COLUMN)55 Malta(COLUMN)cloudy(COLUMN) 1 p.m.(COLUMN)73 Manila(COLUMN)clear(COLUMN) 8 p.m.(COLUMN)86 Moscow(COLUMN)clear(COLUMN) 3 p.m.(COLUMN)55 New Delhi(COLUMN)cloudy(COLUMN) 5 p.m.(COLUMN)84 Nice(COLUMN)cloudy(COLUMN) 1 p.m.(COLUMN)61 Oslo(COLUMN)clear(COLUMN) 1 p.m.(COLUMN)54 Paris(COLUMN)rain(COLUMN) 1 p.m.(COLUMN)45 Peking(COLUMN)cloudy(COLUMN) 8 p.m.(COLUMN)68 Rome(COLUMN)cloudy(COLUMN) 1 p.m.(COLUMN)68 Saigon(COLUMN)clear(COLUMN) 8 p.m.(COLUMN)84 Sofia(COLUMN)clear(COLUMN) 2 p.m.(COLUMN)77 Stockholm(COLUMN)cloudy(COLUMN) 1 p.m.(COLUMN)57 Syndey(COLUMN)clear(COLUMN)10 p.m.(COLUMN)61 Tel Aviv(COLUMN)clear(COLUMN) 2 p.m.(COLUMN)72 Tokyo(COLUMN)rain(COLUMN) 9 p.m.(COLUMN)52 Tunis(COLUMN)clear(COLUMN) 1 p.m.(COLUMN)70 Vienna(COLUMN)cloudy(COLUMN) 1 p.m.(COLUMN)72 Warsaw(COLUMN)pt. cldy.(COLUMN)10 p.m.(COLUMN)81(END TABLE) Temperatures (Western Hemisphere)(TABLE) City(COLUMN)Weather(COLUMN)High(COLUMN)Low Acapulco(COLUMN)clear(COLUMN)88(COLUMN)73 Barbados(COLUMN)clear(COLUMN)85(COLUMN)77 Bermuda(COLUMN)clear(COLUMN)74(COLUMN)67 Bogota(COLUMN)clear(COLUMN)65(COLUMN)49 Calgary(COLUMN)cloudy(COLUMN)64(COLUMN)43 Culiacan(COLUMN)cloudy(COLUMN)90(COLUMN)68 Edmonton(COLUMN)cloudy(COLUMN)68(COLUMN)37 Kingston(COLUMN)cloudy(COLUMN)86(COLUMN)78 Montego Bay(COLUMN)cloudy(COLUMN)85(COLUMN)73 Mexico City(COLUMN)haze(COLUMN)78(COLUMN)51 Monterrey(COLUMN)cloudy(COLUMN)90(COLUMN)70 Montreal(COLUMN)clear(COLUMN)55(COLUMN)34 Nassau(COLUMN)cloudy(COLUMN)77(COLUMN)72 Ottawa(COLUMN)clear(COLUMN)55(COLUMN)34 Regina(COLUMN)clear(COLUMN)81(COLUMN)50 St. Kitts(COLUMN)pt. cloudy(COLUMN)86(COLUMN)74 St. Thomas(COLUMN)clear(COLUMN)88(COLUMN)75 Toronto(COLUMN)cloudy(COLUMN)54(COLUMN)36 Vancouver(COLUMN)pt. cloudy(COLUMN)59(COLUMN)45 Veragruz(COLUMN)haze(COLUMN)91(COLUMN)72 Winnipeg(COLUMN)cloudy(COLUMN)79(COLUMN)55(END TABLE)