Washington: Mostly sunny, high in mid 70s, low in 50s. Chance of rain is near zero today and 20 percent tonight. Winds will be southeasterly at 10 mph. Sunday - Mostly cloudy with a chance of rain, high in 70s.

Maryland and Virginia: Today - Increasing cloudiness, high in low to mid 70s, low in low to mid 50s. Sunday - Mostly cloudy with a chance of rain, high in 70s.

Lower Potomac and Chesapeake Bay: Today - Fair, visibility more than five miles. Winds will southeasterly at 15 knots. Waves in unprotected waters will be 2 feet.

Extended Area Outlook for Monday through Wednesday: Partly cloudy with a chance of showers on Monday and Wednesday. Highs will be in the 70s and lows in the 50s. Normal Washington temperatures for the period will be a high of 75 and a low of 55.

The Nation Yesterday: Showers were scattered from northern lower Michigan to eastern Nebraska. The rain left Minnesota as Canadian air spread onto the state. The heaviest showers passed through northeastern Wisconsin into upper and northern lower Michigan. A weak low in the northwestern Gulf of Mexico along with a cold front along the eastern Gulf Coast was responsible for the thundershowers through the southern states. The strongest storms were offshore from southern Texas curving along the coastline to southern Florida. Light amounts of rainfall were recorded as showers moved inland. Most of the nation had fair weather. Skies were sunny from the northeast, through the Ohio Valley, across the southern Plains, to the West Coast. Temperatures were rather cool in the northeast, in the 50s and low 50s, and pleasant across the Plains. The Southwest and the West Coast were warming rapidly, 98 degrees at San Bernardino and 97 at Phoenix. Sunny skies were returning to the northern Rockies as high pressure cover Idaho and Montana. The northwest partly sunny with cloudy skies along the coast, with cool temperatures. From previous rains in southwestern Texas, watersheds along the Rio Conchos were overloaded. Water was being released at a frightening rate down the Rio Conchos threatening thousands of acres of farmland near Presidio with flooding.

The National Weather Forecast for today - most of the nation will enjoy a sunny pleasant day. Thundershowers will continue ahead of a cold front through the upper Great Lakes region, the Ohio Valley, the Virginias and the Carolinas, into Florida. Showers will spread through Washington into western Montana. Southern California and the deserts of Arizona will still be hot. The Pacific northwest will remain cool. Canadian air will keep the mercury in the 60s from the Dakotas, through the Great Lakes region, into New England.

Almanac Data for today: The sun rises 7:03 a.m., sets 6:53 p.m.; moon rises 5:20 a.m., sets 6:05 p.m. Tides; high 7:29 a.m. and 7:53 p.m., low 1:56 a.m. and 2:19 p.m. High and low tides at the following locations may be obtained by subtracting the hours indicated from the hours above: Annapolis (3 1/4), Bloody Point Lighthouse (4 1/2), Colonial Beach (5 1/4), Norfolk (1), Virginia Beach (3/4), Solomons Island (6), Point Lookout (7).

Pollen Count: 11 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 19 for the pollutant, photochemical oxidants. Index values between 0 and 24 indicate good 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 remain good.

The National Weather Service forecasts the Potomac River stage at Little Falls should remain near 2.9 feet today. Local Temps., Humidity(TABLE) Time(COLUMN)T.(COLUMN)H. 12 midnite(COLUMN)59(COLUMN)51 1 a.m.(COLUMN)59(COLUMN)51 2 a.m.(COLUMN)58(COLUMN)51 3 a.m.(COLUMN)55(COLUMN)55 4 a.m.(COLUMN)54(COLUMN)57 5 a.m.(COLUMN)53(COLUMN)55 6 a.m.(COLUMN)52(COLUMN)57 7 a.m.(COLUMN)50(COLUMN)59 8 a.m.(COLUMN)52(COLUMN)54 9 a.m.(COLUMN)55(COLUMN)49 10 a.m.(COLUMN)56(COLUMN)47 11 a.m.(COLUMN)59(COLUMN)46 12 noon(COLUMN)61(COLUMN)38 1 p.m.(COLUMN)64(COLUMN)34 2 p.m.(COLUMN)65(COLUMN)32 3 p.m.(COLUMN)67(COLUMN)31 4 p.m.(COLUMN)68(COLUMN)32 5 p.m.(COLUMN)68(COLUMN)33 6 p.m.(COLUMN)68(COLUMN)36 7 p.m.(COLUMN)65(COLUMN)37(END TABLE) Temperatures ending 8 a.m. (EDT) yesterday(TABLE) City(COLUMN)H.(COLUMN)L. Albany(COLUMN)60(COLUMN)30 Albuquerque(COLUMN)82(COLUMN)51 Amarillo(COLUMN)79(COLUMN)57 Anchorage(COLUMN)59(COLUMN)35 Asheville(COLUMN)78(COLUMN)54 Atlanta(COLUMN)83(COLUMN)65 Atlantic City(COLUMN)71(COLUMN)46 Austin(COLUMN)79(COLUMN)61 Baltimore(COLUMN)77(COLUMN)43 Billings(COLUMN)69(COLUMN)50 Birmingham(COLUMN)80(COLUMN)47 Bismarck(COLUMN)74(COLUMN)51 Boise(COLUMN)76(COLUMN)42 Boston(COLUMN)70(COLUMN)43 Brownsville(COLUMN)76(COLUMN)68 Buffalo(COLUMN)56(COLUMN)37 Burlington(COLUMN)58(COLUMN)30 Casper(COLUMN)78(COLUMN)40 Charleston, S.C.(COLUMN)83(COLUMN)68 Charleston, W.Va.(COLUMN)70(COLUMN)43 Charlotte(COLUMN)81(COLUMN)59 Cheyenne(COLUMN)76(COLUMN)42 Chicago(COLUMN)63(COLUMN)47 Cincinnati(COLUMN)70(COLUMN)43 Cleveland(COLUMN)62(COLUMN)41 Columbia, S.C.(COLUMN)89(COLUMN)59 Columbus(COLUMN)67(COLUMN)44 Dal-Ft. Worth(COLUMN)89(COLUMN)57 Dayton(COLUMN)69(COLUMN)42 Denver(COLUMN)87(COLUMN)53 Des Moines(COLUMN)70(COLUMN)54 Detroit(COLUMN)62(COLUMN)41 Duluth(COLUMN)62(COLUMN)49 El Paso(COLUMN)79(COLUMN)56 Fairbanks(COLUMN)50(COLUMN)39 Fargo(COLUMN)73(COLUMN)48 Flagstaff(COLUMN)79(COLUMN)46 Great Falls(COLUMN)60(COLUMN)44 Hartford(COLUMN)67(COLUMN)31 Helena(COLUMN)61(COLUMN)48 Honolulu(COLUMN)89(COLUMN)75 Houston(COLUMN)78(COLUMN)66 Indianapolis(COLUMN)69(COLUMN)43 Jackson, Miss.(COLUMN)76(COLUMN)64 Jacksonville(COLUMN)82(COLUMN)63 Juneau(COLUMN)54(COLUMN)50 Kansas City(COLUMN)75(COLUMN)56 Las Vegas(COLUMN)103(COLUMN)69 Little Rock(COLUMN)79(COLUMN)60 Los Angeles(COLUMN)98(COLUMN)73 Louisville(COLUMN)73(COLUMN)49 Memphis(COLUMN)81(COLUMN)60 Miami Beach(COLUMN)84(COLUMN)78 Midland-Odessa(COLUMN)76(COLUMN)54 Milwaukee(COLUMN)60(COLUMN)47 Mpls-St. Paul(COLUMN)71(COLUMN)56 Nashville(COLUMN)78(COLUMN)56 New Orleans(COLUMN)81(COLUMN)73 New York(COLUMN)69(COLUMN)45 Norfolk(COLUMN)82(COLUMN)59 North Platte(COLUMN)91(COLUMN)52 Oklahoma City(COLUMN)90(COLUMN)61 Omaha(COLUMN)74(COLUMN)59 Orlando(COLUMN)87(COLUMN)67 Philadelphia(COLUMN)72(COLUMN)44 Phoenix(COLUMN)102(COLUMN)75 Pittsburgh(COLUMN)62(COLUMN)35 Portland, Me.(COLUMN)65(COLUMN)41 Portland, Ore.(COLUMN)70(COLUMN)50 Providence(COLUMN)68(COLUMN)37 Raleigh(COLUMN)84(COLUMN)56 Rapid City(COLUMN)77(COLUMN)48 Reno(COLUMN)87(COLUMN)41 Richmond(COLUMN)85(COLUMN)44 St. Louis(COLUMN)71(COLUMN)45 St. Prbg-Tampa(COLUMN)88(COLUMN)71 Salt Lake City(COLUMN)84(COLUMN)49 San Antonio(COLUMN)80(COLUMN)60 San Diego(COLUMN)85(COLUMN)72 San Francisco(COLUMN)78(COLUMN)65 San Juan(COLUMN)95(COLUMN)78 St. Ste. Marie(COLUMN)59(COLUMN)42 Seattle(COLUMN)64(COLUMN)57 Shreveport(COLUMN)77(COLUMN)64 Sioux Falls(COLUMN)75(COLUMN)56 Spokane(COLUMN)66(COLUMN)48 Syracuse(COLUMN)63(COLUMN)35 Topeka(COLUMN)76(COLUMN)50 Tucson(COLUMN)93(COLUMN)70 Tulsa(COLUMN)90(COLUMN)61 Washington(COLUMN)77(COLUMN)50 Wichita(COLUMN)82(COLUMN)58(END TABLE) Temperatures Abroad Yesterday(TABLE) City(COLUMN)Weath.(COLUMN)Time(COLUMN)Temp. Aberdeen(COLUMN)pt. cldy(COLUMN)1 p.m.(COLUMN)59 Amsterdam(COLUMN)pt. cldy(COLUMN)1 p.m.(COLUMN)57 Ankara(COLUMN)pt. cldy(COLUMN)3 p.m.(COLUMN)86 Athens(COLUMN)clear(COLUMN)2 p.m.(COLUMN)72 Auckland(COLUMN)pt. cldy(COLUMN)12 a.m.(COLUMN)54 Berlin(COLUMN)rain(COLUMN)1 p.m.(COLUMN)50 Birmingham(COLUMN)cloudy(COLUMN)1 p.m.(COLUMN)55 Bonn(COLUMN)cloudy(COLUMN)1 p.m.(COLUMN)59 Brussels(COLUMN)pt. cldy(COLUMN)1 p.m.(COLUMN)59 Casablanca(COLUMN)pt. cldy(COLUMN)12 p.m.(COLUMN)77 Copenhagen(COLUMN)pt. cldy(COLUMN)1 p.m.(COLUMN)55 Dublin(COLUMN)rain(COLUMN)1 p.m.(COLUMN)54 Geneva(COLUMN)clear(COLUMN)1 p.m.(COLUMN)61 Hong Kong(COLUMN)cloudy(COLUMN)8 p.m.(COLUMN)79 Jerusalem(COLUMN)clear(COLUMN)2 p.m.(COLUMN)73 Lisbon(COLUMN)haze(COLUMN)12 p.m.(COLUMN)79 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)75 Manila(COLUMN)cloudy(COLUMN)8 p.m.(COLUMN)81 Moscow(COLUMN)cloudy(COLUMN)3 p.m.(COLUMN)50 New Delhi(COLUMN)clear(COLUMN)5 p.m.(COLUMN)90 Nice(COLUMN)clear(COLUMN)1 p.m.(COLUMN)70 Oslo(COLUMN)cloudy(COLUMN)1 p.m.(COLUMN)46 Paris(COLUMN)cloudy(COLUMN)1 p.m.(COLUMN)59 Peking(COLUMN)clear(COLUMN)8 p.m.(COLUMN)70 Rome(COLUMN)Pt. cldy(COLUMN)1 p.m.(COLUMN)72 Saigon(COLUMN)pt. cldy(COLUMN)8 p.m.(COLUMN)77 Sofia(COLUMN)cloudy(COLUMN)2 p.m.(COLUMN)48 Stockholm(COLUMN)cloudy(COLUMN)2 p.m.(COLUMN)50 Sydney(COLUMN)clear(COLUMN)10 p.m.(COLUMN)55 Tokyo(COLUMN)rain(COLUMN)9 p.m.(COLUMN)64 Tunis(COLUMN)clear(COLUMN)1 p.m.(COLUMN)81 Vienna(COLUMN)rain(COLUMN)1 p.m.(COLUMN)50 Warsaw(COLUMN)pt. cldy(COLUMN)1 p.m.(COLUMN)54(END TABLE) Temperatures (Western Hemisphere)(TABLE) City(COLUMN)Weath.(COLUMN)High(COLUMN)Low Acapulco(COLUMN)fair(COLUMN)90(COLUMN)77 Barbados(COLUMN)cloudy(COLUMN)87(COLUMN)75 Bermuda(COLUMN)pt. cldy(COLUMN)84(COLUMN)76 Bogota(COLUMN)cloudy(COLUMN)76(COLUMN)48 Calgary(COLUMN)clear(COLUMN)59(COLUMN)48 Culiacan(COLUMN)pt. cldy(COLUMN)95(COLUMN)71 Edmonton(COLUMN)pt. cldy(COLUMN)63(COLUMN)39 Havana(COLUMN)pt. cldy(COLUMN)86(COLUMN)75 Kingston(COLUMN)pt. cldy(COLUMN)89(COLUMN)79 Montego Bay(COLUMN)cloudy(COLUMN)90(COLUMN)75 Mexico City(COLUMN)haze(COLUMN)73(COLUMN)58 Monterrey(COLUMN)pt. cldy(COLUMN)70(COLUMN)65 Montreal(COLUMN)pt. cldy(COLUMN)57(COLUMN)32 Nassau(COLUMN)pt. cldy(COLUMN)86(COLUMN)70 Ottawa(COLUMN)cloudy(COLUMN)54(COLUMN)34 Regina(COLUMN)cloudy(COLUMN)61(COLUMN)45 St. Kitts(COLUMN)pt. cldy(COLUMN)91(COLUMN)77 Toronto(COLUMN)cloudy(COLUMN)57(COLUMN)34 Vancouver(COLUMN)rain(COLUMN)41(COLUMN)55 Vera Cruz(COLUMN)pt. cldy(COLUMN)90(COLUMN)74 Winnipeg(COLUMN)cloudy(COLUMN)52(COLUMN)46(END TABLE)