Washington: Today - Mostly cloudy, high in low 80s, low in through tonight. Winds will be northerly at 15 mph. Saturday - Mostly cloudy with a slight chance of rain, high in upper 70s.

Maryland and Virginia: Today - Mostly cloudy with a chance of showers in north and west portions, high in 80s and low in upper 50s. Saturday - Mostly cloudy, high near 80.

Lower Potomac and Chesapeake Bay: Today - Fair, visibility more than five miles except in rain. Winds will be northwesterly at 15 knots. There will be a chance of showers through tonight. Waves in unprotected waters will be 2 feet.

Atlantic Ocean Beaches from New Jersey to North Carolina: Today - Cloudy and becoming cooler, high in 80s. Saturday - Variable cloudiness and cool, high from mid 70s to around 80.

Extended Area Outlook for Sunday through Tuesday: Partly cloudy with pleasant days and cool nights. Highs will average in the 70s with lows from the mid 50s to the mid 60s. Normal Washington temperatures for the period will be a high of 77 and a low 58.

West Virginia: Today - Mostly cloudy with occasional rain or thunderstorms. Highs will be in the upper 60s in the northwest and 80 in the east, lows will be in the 50s. Saturday - Partly cloudy, high in low to mid 70s.

The Nation Yesterday: The wide band of showers and thunderstorms in the central U.S. that have been associated the past few days with a very slowly moving cold front, broke somewhat during the morning hours. Showers and thunderstorms were scattered over much of eastern and central Texas and southern and central Illinois into the upper Ohio Valley and lower Great Lakes. Other thundershowers were scattered over Florida and northern Alabama. Rains and showers were also scattered in the Pacific Northwest, northern Idaho, southern New Mexico and extreme southern New Mexico and extreme southwest Texas. Cloudy hazy and warm weather was the rule over mid Atlantic Coast region. Sunny but unseasonably cool conditions ruled the northern and central Rocky Mountain regions eastward into the northern half of the Mississippi Valley region. Crisp early afternoon temperatures in the 50s were common in the Rocky Mountain states with 60s widespread over the Great Plains and middle and upper Mississippi Valley regions into the upper Great Lakes. These temperatures posed quite a contrast to the 90s reported in much of the lower Mississippi Valley region. Along the Atlantic Coast readings in the 80s were common.

The National Weather Forecast for today. Showers and thundershowers will be scattered to widely scattered from the southern Rockies through Texas, the lower Mississippi and eastern Ohio Valley regions eastward to the Atlantic. Scattered showers will linger in the Pacific Northwest. It will be sunny with a warming trend across the northern and central Rockies into the upper and middle Mississippi Valley region. It will be cooler or turning cooler over the Appalachians, the northern half of the Atlantic Coast and the central Gulf Coast states into southern Texas. Elsewhere temperature changes will be minor.

Almanac Data for today: The sun rises 6:55 a.m., sets 7:06 p.m.; moon rises 11:11 p.m. sets 12:47 a.m. Tides: high 12.57 p.m. low 7:34 a.m. and 7:44 p.m. High and low tides at the following locations may be obtained by subracting the hours indicated from the hours above: Annapolis (3 1/4), Bloody Point Lighthouse (4 1/2), Deale, Md. (4 1/2), Colonial Beach (5 1/4), Norfolk (1), Virginia Beach (3/4), Solomons Island (6 1/4), Point Lookout (7).

Pollen Count: 20-Ragweed (a reading of more than 7 is considered to be 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 50 for the pollutant, photo-chemical oxidants. Index values between 50 and 99 indicate unhealthy air quality. When the index exceeds 100 the air is considered very unhealthy and individuals with lung, heart and eye ailments are urged to restrict their activity. The forecast for today indicates that the air quality will improve.

The National Weather Service forecasts the Potomac River stage at Little Falls should remain at 3.0 feet today.(TABLE) Time(COLUMN)T.(COLUMN)H. 12 mid.(COLUMN)70(COLUMN)73 1 a.m.(COLUMN)70(COLUMN)73 2 a.m.(COLUMN)69(COLUMN)76 3 a.m.(COLUMN)69(COLUMN)76 4 a.m.(COLUMN)69(COLUMN)76 5 a.m.(COLUMN)70(COLUMN)76 6 a.m.(COLUMN)69(COLUMN)79 7 a.m.(COLUMN)68(COLUMN)81 8 a.m.(COLUMN)70(COLUMN)76 9 a.m.(COLUMN)71(COLUMN)73 10 a.m.(COLUMN)73(COLUMN)62 11 a.m.(COLUMN)74(COLUMN)62 12 noon(COLUMN)77(COLUMN)60 1 p.m.(COLUMN)79(COLUMN)60 2 p.m.(COLUMN)81(COLUMN)59 3 p.m.(COLUMN)83(COLUMN)55 4 p.m.(COLUMN)84(COLUMN)53 5 p.m.(COLUMN)84(COLUMN)53 6 p.m.(COLUMN)53(COLUMN)57 7 p.m.(COLUMN)81(COLUMN)63(END TABLE) Temperatures ending 8 a.m. (EDT) yesterday(TABLE) City(COLUMN)H.(COLUMN)L. Albany(COLUMN)76(COLUMN)60 Albuquerque(COLUMN)77(COLUMN)49 Amarillo(COLUMN)58(COLUMN)47 Anchorage(COLUMN)54(COLUMN)47 Asheville(COLUMN)85(COLUMN)68 Atlanta(COLUMN)94(COLUMN)70 Atlantic City(COLUMN)68(COLUMN)60 Austin(COLUMN)90(COLUMN)75 Baltimore(COLUMN)79(COLUMN)61 Billings(COLUMN)55(COLUMN)38 Birmingham(COLUMN)93(COLUMN)76 Bismarck(COLUMN)56(COLUMN)30 Boise(COLUMN)68(COLUMN)48 Boston(COLUMN)74(COLUMN)59 Brownsville(COLUMN)93(COLUMN)75 Buffalo(COLUMN)83(COLUMN)73 Burlington(COLUMN)73(COLUMN)65 Casper(COLUMN)52(COLUMN)30 Charleston, S.C.(COLUMN)84(COLUMN)72 Charleston, W.Va.(COLUMN)89(COLUMN)69 Charlotte(COLUMN)83(COLUMN)69 Cheyenne(COLUMN)49(COLUMN)28 Chicago(COLUMN)90(COLUMN)61 Cincinnati(COLUMN)95(COLUMN)70 Cleveland(COLUMN)92(COLUMN)72 Columbia, S.C.(COLUMN)90(COLUMN)68 Columbus(COLUMN)92(COLUMN)70 Dal.-Ft. Worth(COLUMN)96(COLUMN)69 Dayton(COLUMN)93(COLUMN)73 Denver(COLUMN)50(COLUMN)33 Des Moines(COLUMN)61(COLUMN)51 Detroit(COLUMN)91(COLUMN)69 Duluth(COLUMN)57(COLUMN)41 El Paso(COLUMN)88(COLUMN)64 Fairbanks(COLUMN)41(COLUMN)34 Fargo(COLUMN)60(COLUMN)36 Flagstaff(COLUMN)69(COLUMN)36 Great Falls(COLUMN)60(COLUMN)42 Hartford(COLUMN)75(COLUMN)56 Helena(COLUMN)62(COLUMN)34 Honolulu(COLUMN)88(COLUMN)73 Houston(COLUMN)87(COLUMN)75 Indianapolis(COLUMN)89(COLUMN)68 Jackson, Miss.(COLUMN)96(COLUMN)66 Jacksonville(COLUMN)88(COLUMN)70 Juneau(COLUMN)48(COLUMN)41 Kansas City(COLUMN)65(COLUMN)54 Las Vegas(COLUMN)76(COLUMN)51 Little Rock(COLUMN)92(COLUMN)72 Los Angeles(COLUMN)90(COLUMN)59 Louisville(COLUMN)93(COLUMN)72 Memphis(COLUMN)95(COLUMN)76 Miami Beach(COLUMN)84(COLUMN)80 Midland-Odessa(COLUMN)77(COLUMN)54 Milwaukee(COLUMN)75(COLUMN)55 Mpls.-St. Paul(COLUMN)60(COLUMN)45 Nashville(COLUMN)93(COLUMN)71 New Orleans(COLUMN)92(COLUMN)70 New York(COLUMN)74(COLUMN)61 Norfolk(COLUMN)77(COLUMN)57 North Platte(COLUMN)64(COLUMN)28 Oklahoma City(COLUMN)81(COLUMN)57 Omaha(COLUMN)57(COLUMN)45 Orlando(COLUMN)92(COLUMN)70 Philadelphia(COLUMN)76(COLUMN)61 Phoenix(COLUMN)92(COLUMN)60 Pittsburgh(COLUMN)86(COLUMN)69 Portland, Me.(COLUMN)72(COLUMN)55 Portland, Ore.(COLUMN)67(COLUMN)56 Providence(COLUMN)70(COLUMN)54 Raleigh(COLUMN)80(COLUMN)58 Rapid City(COLUMN)59(COLUMN)35 Reno(COLUMN)67(COLUMN)31 Richmond(COLUMN)82(COLUMN)60 St. Louis(COLUMN)92(COLUMN)59 St. Prg.-Tampa(COLUMN)91(COLUMN)68 Salt Lake City(COLUMN)58(COLUMN)36 San Antonio(COLUMN)89(COLUMN)74 San Diego(COLUMN)86(COLUMN)61 San Francisco(COLUMN)80(COLUMN)55 San Juan(COLUMN)88(COLUMN)80 St. Ste. Marie(COLUMN)59(COLUMN)51 Seattle(COLUMN)58(COLUMN)53 Shreveport(COLUMN)90(COLUMN)67 Sioux Falls(COLUMN)59(COLUMN)36 Spokane(COLUMN)66(COLUMN)51 Syracuse(COLUMN)80(COLUMN)65 Topeka(COLUMN)63(COLUMN)53 Tucson(COLUMN)86(COLUMN)60 Tulsa(COLUMN)96(COLUMN)58 Washington(COLUMN)79(COLUMN)68 Wichita(COLUMN)63(COLUMN)51(END TABLE) Temperatures Abroad Yesterday(TABLE) City(COLUMN)Weather(COLUMN)Time(COLUMN)Temp. Aberdeen(COLUMN)rain(COLUMN)1 p.m.(COLUMN)66 Amsterdam(COLUMN)cloudy(COLUMN)1 p.m.(COLUMN)61 Ankara(COLUMN)clear(COLUMN)3 p.m.(COLUMN)79 Athens(COLUMN)pt.cldy(COLUMN)2 p.m.(COLUMN)77 Auckland(COLUMN)rain(COLUMN)12 a.m.(COLUMN)54 Berlin(COLUMN)cloudy(COLUMN)1 p.m.(COLUMN)57 Bonn(COLUMN)cloudy(COLUMN)1 p.m.(COLUMN)61 Brussels(COLUMN)cloudy(COLUMN)1 p.m.(COLUMN)63 Casablanca(COLUMN)cloudy(COLUMN)12 a.m.(COLUMN)75 Copenhagen(COLUMN)cloudy(COLUMN)1 p.m.(COLUMN)57 Dublin(COLUMN)clear(COLUMN)1 p.m.(COLUMN)68 Geneva(COLUMN)clear(COLUMN)1 p.m.(COLUMN)59 Hong Kong(COLUMN)storm(COLUMN)8 p.m.(COLUMN)79 Jerusalem(COLUMN)clear(COLUMN)2 p.m.(COLUMN)77 Lisbon(COLUMN)haze(COLUMN)12 p.m.(COLUMN)73 London(COLUMN)clear(COLUMN)1 p.m.(COLUMN)68 Madrid(COLUMN)clear(COLUMN)1 p.m.(COLUMN)79 Malta(COLUMN)cloudy(COLUMN)1 p.m.(COLUMN)73 Manila(COLUMN)pt.cldy(COLUMN)8 p.m.(COLUMN)82 Moscow(COLUMN)pt.cldy(COLUMN)3 p.m.(COLUMN)50 New Delhi(COLUMN)pt.cldy(COLUMN)5 p.m.(COLUMN)88 Nice(COLUMN)clear(COLUMN)3 p.m.(COLUMN)73 Oslo(COLUMN)pt.cldy(COLUMN)1 p.m.(COLUMN)59 Paris(COLUMN)cloudy(COLUMN)1 p.m.(COLUMN)66 Peking(COLUMN)cloudy(COLUMN)8 p.m.(COLUMN)64 Rome(COLUMN)clear(COLUMN)1 p.m.(COLUMN)75 Sofia(COLUMN)Cloudy(COLUMN)2 p.m.(COLUMN)52 Stockholm(COLUMN)pt.cldy(COLUMN)1 p.m.(COLUMN)52 Sydney(COLUMN)cloudy(COLUMN)10 p.m.(COLUMN)57 Tokyo(COLUMN)cloudy(COLUMN)9 a.m.(COLUMN)72 Vienna(COLUMN)rain(COLUMN)1 p.m.(COLUMN)52 Warsaw(COLUMN)cloudy(COLUMN)1 p.m.(COLUMN)50(END TABLE) Temperatures (Western Hemisphere)(TABLE) City(COLUMN)Weather(COLUMN)High(COLUMN)Low Acapulco(COLUMN)fair(COLUMN)90(COLUMN)79 Barbados(COLUMN)pt.cldy(COLUMN)88(COLUMN)77 Bermuda(COLUMN)clear(COLUMN)84(COLUMN)77 Bogota(COLUMN)cloudy(COLUMN)66(COLUMN)46 Calgary(COLUMN)cloudy(COLUMN)63(COLUMN)45 Culiacan(COLUMN)fair(COLUMN)96(COLUMN)73 Edmonton(COLUMN)cloudy(COLUMN)63(COLUMN)39 Havana(COLUMN)pt.cldy(COLUMN)88(COLUMN)77 Montego Bay(COLUMN)fair(COLUMN)86(COLUMN)75 Mexico City(COLUMN)cloudy(COLUMN)73(COLUMN)57 Monterrey(COLUMN)pt.cldy.(COLUMN)90(COLUMN)73 Montreal(COLUMN)cloudy(COLUMN)70(COLUMN)61 Nassau(COLUMN)pt.cldy(COLUMN)90(COLUMN)73 Ottawa(COLUMN)cloudy(COLUMN)64(COLUMN)61 Regina(COLUMN)clear(COLUMN)57(COLUMN)34 St. Kitts(COLUMN)pt.cldy(COLUMN)87(COLUMN)73 Toronto(COLUMN)fog(COLUMN)72(COLUMN)61 Vancouver(COLUMN)cloudy(COLUMN)59(COLUMN)50 Vera Cruz(COLUMN)cloudy(COLUMN)84(COLUMN)73 Winnipeg(COLUMN)clear(COLUMN)59(COLUMN)36(END TABLE)