Washington: Today - Rain, which may cause brief local flooding of small streams and road, highs 66 to 72, low 66 to 72, low 60 to 65. Winds will be easterly at 15 mph. Tuesday - Cloudy, high in low 70s.

Maryland and Virginia: Today - Rain; which may cause brief local flooding of small streams and roads, high near 70, low in mid 60s. Tuesday - Cloudy, high near 70.

Lower Potomac and Chesapeake Bay: Today - Rain, visibility five miles or less. Winds will be easterly at 16 knots. Waves in unprotected waters will be 2 feet.

Atlantic Ocean Beaches from New Jersey to North Carolina: Today - Rain, which in the 60s in the north. It will be cloudy with thundershowers in the south, high in 70s. Tuesday - Cloudy and cool with some lingering showers, high near 70. Water temperatures will be in the 60s in the north and 70s in the south.

Extended Areas Outlook for Wednesday through Friday: Considerable cloudiness with a chance of showers or thunderstorms by midperiod. Highs will range from the 70s on Wednesday and in the 80s Thursday and Friday. Lows will average in the 60s. Normal Washington temperatures for the period will be a high of 88 and a low of 69.

The Nation Yesterday: The results of heavy rains during the past few days are being felt across northern Illinois into southern Wisconsin.There was a great deal of flooding in extreme northwestern Cook and McHenry counties in Illinois, with Salt Creek two feet over flood stage at Rolling Meadows. The Wisconsin division of emergency services advised against travel in southwestern and southcentral portions of the state if at all possible. Forty per cent of the roads in Monroe County have been damaged by high water, including five roads severely damaged and eight bridges destroyed. Ten roads have been closed in La Crosse County because of washouts and one railroad bridge in beyond use. Showers and occasional thundershowers were scattered through the western portion of the central Plains as well as from the upper Missouri Valley to the northern Pacific coast. Otherwise, skies were generally partly cloudy west of the Mississippi Valley.

The National Weather Forecast for today - Showers and thundershowers will extend from southern New England across the lower Great Lakes, the Upper Ohio Valley, the Appalachians, the Atlantic Coastal states through Florida and the eastern gulf states. Showers and thundershowers will also reach from the upper Missouri Valley into the northern Rockies. Temperatures will be mild from New England across the lower Great Lakes and Ohio Valley through the Atlantic coast and the Virginia as it will also be mild from the upper Missouri Valley through the northern half of the Rockies, the northern intermountain region, the Great Basin across the central and southern Pacific coast. Hot to very hot temperatures will reach over the central Plains states, while the remainder of the nation will continue seasonably warm.

Almanac Data for today. The sun rises 5:47 a.m., sets 8:37 p.m.; moon rises 4:35 a.m., set 7:06 p.m. Tides: High, 7:40 a.m. and 8:09 p.m.; low, 10:48 a.m. and 2:27 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), Deale, Md. (4 1/2), Colonial Beach (5 1/4), Norfolk (1), Virginia Beach (3/4), Solomons Island (6 1/4).

The Council of Government Air Quality Index for yesterday showed the high reading in the Washington area during the 12 to 1 p.m. period was 19 for the pollutant, photo-chemical oxidants. Index values between 0 and 25 indicate good air quality. When the index exceeds 100 the air is considered very unhealthy and individuals with lung, heart and eve ailments are urged to restrict their activity.

The National Weather Service forecasts the Potomac River stage at Little Falls should rise to 3.8 feet today. Local Temps, Humidity(TABLE) Time(COLUMN)T.(COLUMN)H. 12 midn.(COLUMN)75(COLUMN)56 1 a.m.(COLUMN)75(COLUMN)58 2 a.m.(COLUMN)73(COLUMN)64 3 a.m.(COLUMN)71(COLUMN)63 4 a.m.(COLUMN)69(COLUMN)76 5 a.m.(COLUMN)67(COLUMN)81 6 a.m.(COLUMN)66(COLUMN)81 7 a.m.(COLUMN)65(COLUMN)84 8 a.m.(COLUMN)65(COLUMN)87 9 a.m.(COLUMN)66(COLUMN)87 10 a.m.(COLUMN)66(COLUMN)87 11 a.m.(COLUMN)66(COLUMN)87 12 noon(COLUMN)67(COLUMN)84 1 p.m.(COLUMN)67(COLUMN)84 2 p.m.(COLUMN)68(COLUMN)84 3 p.m.(COLUMN)68(COLUMN)84 4 p.m.(COLUMN)68(COLUMN)84 5 p.m.(COLUMN)68(COLUMN)84 6 p.m.(COLUMN)69(COLUMN)81 7 p.m.(COLUMN)68(COLUMN)84(END TABLE) Temperatures ending 8 a.m. (EDT) yesterday:(TABLE) City(COLUMN)H(COLUMN)L. Albany(COLUMN)76(COLUMN)40 Albuquerque(COLUMN)94(COLUMN)61 Amarillo(COLUMN)92(COLUMN)65 Anchorage(COLUMN)62(COLUMN)43 Asheville(COLUMN)90(COLUMN)60 Altanta(COLUMN)94(COLUMN)72 Atlantic City(COLUMN)75(COLUMN)60 Austin(COLUMN)97(COLUMN)76 Baltimore(COLUMN)84(COLUMN)62 Billings(COLUMN)85(COLUMN)60 Birmingham(COLUMN)96(COLUMN)70 Bismarck(COLUMN)81(COLUMN)58 Boise(COLUMN)82(COLUMN)50 Boston(COLUMN)75(COLUMN)56 Brownsville(COLUMN)97(COLUMN)78 Buffalo(COLUMN)73(COLUMN)52 Burlington(COLUMN)67(COLUMN)40 Casper(COLUMN)87(COLUMN)52 Charleston, S.C.(COLUMN)99(COLUMN)80 Charleston, W.V.,(COLUMN)87(COLUMN)64 Charlotte(COLUMN)92(COLUMN)70 Cheyenne(COLUMN)82(COLUMN)55 Chicago(COLUMN)84(COLUMN)70 Cincinnati(COLUMN)86(COLUMN)68 Cleveland(COLUMN)74(COLUMN)62 Columbia, S.C.(COLUMN)98(COLUMN)71 Columbus(COLUMN)83(COLUMN)62 Dal.-Ft. Worth(COLUMN)99(COLUMN)77 Dayton(COLUMN)85(COLUMN)67 Denver(COLUMN)91(COLUMN)59 Des Moines(COLUMN)81(COLUMN)70 Detroit(COLUMN)67(COLUMN)60 Duluth(COLUMN)62(COLUMN)50 El Paso(COLUMN)96(COLUMN)67 Fairbanks(COLUMN)63(COLUMN)49 Fargo(COLUMN)73(COLUMN)65 Flagstaff(COLUMN)83(COLUMN)45 Great Falls(COLUMN)81(COLUMN)59 Hartford(COLUMN)82(COLUMN)48 Helena(COLUMN)85(COLUMN)53 Honolulu(COLUMN)86(COLUMN)77 Houston(COLUMN)94(COLUMN)78 Indianapolis(COLUMN)93(COLUMN)71 Jackson, Miss.(COLUMN)94(COLUMN)75 Jacksonville(COLUMN)96(COLUMN)76 Juneau(COLUMN)50(COLUMN)47 Kansas City(COLUMN)97(COLUMN)72 Las Vegas(COLUMN)102(COLUMN)73 Little Rock(COLUMN)97(COLUMN)76 Los Angeles(COLUMN)82(COLUMN)59 Louisville(COLUMN)97(COLUMN)72 Memphis(COLUMN)94(COLUMN)80 Miami Beach(COLUMN)87(COLUMN)81 Midland-Odessa(COLUMN)92(COLUMN)66 Milwaukee(COLUMN)72(COLUMN)59 Mpls.-St. Paul(COLUMN)82(COLUMN)68 Nashville(COLUMN)97(COLUMN)73 New Orleans(COLUMN)93(COLUMN)74 New York(COLUMN)83(COLUMN)63 Norfolk(COLUMN)80(COLUMN)62 North Platte(COLUMN)91(COLUMN)56 Oklahoma City(COLUMN)97(COLUMN)75 Omaha(COLUMN)87(COLUMN)67 Orlando(COLUMN)97(COLUMN)75 Philadelphia(COLUMN)81(COLUMN)63 Phoenix(COLUMN)109(COLUMN)71 Pittsburgh(COLUMN)76(COLUMN)61 Portland, Maine(COLUMN)75(COLUMN)44 Portland, Ore.(COLUMN)78(COLUMN)59 Providence(COLUMN)78(COLUMN)51 Raleigh(COLUMN)91(COLUMN)68 Rapid City(COLUMN)88(COLUMN)59 Reno(COLUMN)82(COLUMN)42 Richmond(COLUMN)86(COLUMN)67 St. Louis(COLUMN)97(COLUMN)71 St. Prbg.-Tampa(COLUMN)93(COLUMN)77 Salt Lake City(COLUMN)93(COLUMN)63 San Antonio(COLUMN)95(COLUMN)76 San Diego(COLUMN)74(COLUMN)64 San Francisco(COLUMN)66(COLUMN)56 San Juan(COLUMN)92(COLUMN)75 St. Ste Marie(COLUMN)73(COLUMN)51 Seattle(COLUMN)76(COLUMN)59 Shreveport(COLUMN)97(COLUMN)75 Sioux Falls(COLUMN)81(COLUMN)61 Spokane(COLUMN)79(COLUMN)54 Syracuse(COLUMN)77(COLUMN)53 Topeka(COLUMN)85(COLUMN)71 Tucson(COLUMN)102(COLUMN)70 Tulsa(COLUMN)97(COLUMN)78 Washington(COLUMN)86(COLUMN)64 Wichita(COLUMN)103(COLUMN)71(END TABLE) Temperatures Abroad Yesterday(TABLE) City(COLUMN)Weather(COLUMN)Time(COLUMN)Temp. Aberdeen(COLUMN)pt. cldy(COLUMN)1 p.m.(COLUMN)63 Amsterdam(COLUMN)rain(COLUMN)1 p.m.(COLUMN)59 Ankara(COLUMN)pt. cldy(COLUMN)3 p.m.(COLUMN)75 Athens(COLUMN)clear(COLUMN)2 p.m.(COLUMN)82 Auckland(COLUMN)clear(COLUMN)12 p.m.(COLUMN)43 Berlin(COLUMN)cloudy(COLUMN)1 p.m.(COLUMN)70 Birmingham(COLUMN)cloudy(COLUMN)1 p.m.(COLUMN)63 Bonn(COLUMN)rain(COLUMN)1 p.m.(COLUMN)63 Brussels(COLUMN)rain(COLUMN)1 p.m.(COLUMN)59 Cairo(COLUMN)clear(COLUMN)2 p.m.(COLUMN)90 Casablanca(COLUMN)clear(COLUMN)12 p.m.(COLUMN)73 Copenhagen(COLUMN)cloudy(COLUMN)1 p.M.(COLUMN)63 Dublin(COLUMN)cloudy(COLUMN)1 p.m.(COLUMN)59 Geneva(COLUMN)clear(COLUMN)1 p.m.(COLUMN)70 Hong Kong(COLUMN)clear(COLUMN)8 p.m.(COLUMN)84 Jerusalem(COLUMN)clear(COLUMN)2 p.m.(COLUMN)81 Lebanon(COLUMN)clear(COLUMN)12 p.m.(COLUMN)84 London(COLUMN)cloudy(COLUMN)1 p.m.(COLUMN)63 Madrid(COLUMN)clear(COLUMN)1 p.m.(COLUMN)77 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)70 New Delhi(COLUMN)pt. cldy(COLUMN)5 p.m.(COLUMN)88 Nice(COLUMN)clear(COLUMN)1 p.m.(COLUMN)70 Oslo(COLUMN)cloudy(COLUMN)1 p.m.(COLUMN)64 Paris(COLUMN)cloudy(COLUMN)1 p.m.(COLUMN)66 Peking(COLUMN)cloudy(COLUMN)8 p.m.(COLUMN)81 Rome(COLUMN)clear(COLUMN)1 p.m.(COLUMN)75 Saigon(COLUMN)cloudy(COLUMN)8 p.m.(COLUMN)79 Safia(COLUMN)cloudy(COLUMN)2 p.m.(COLUMN)81 Stockholm(COLUMN)cloudy(COLUMN)1 p.m.(COLUMN)66 Sydney(COLUMN)cloudy(COLUMN)10 p.m.(COLUMN)57 Tokyo(COLUMN)pt. cldy(COLUMN)9 p.m.(COLUMN)79 Tunis(COLUMN)pt. cldy(COLUMN)1 p.m.(COLUMN)77 Vienna(COLUMN)cloudy(COLUMN)1 p.m.(COLUMN)68 Warsaw(COLUMN)(COLUMN)(END TABLE) Temperatures (Western Hemisphere)(TABLE) City(COLUMN)Weather(COLUMN)High(COLUMN)Low Acupulco(COLUMN)pt. cldy(COLUMN)80(COLUMN)78 Barbados(COLUMN)cloudy(COLUMN)83(COLUMN)78 Bermuda(COLUMN)cloudy(COLUMN)83(COLUMN)77 Calgary(COLUMN)pt. cldy(COLUMN)73(COLUMN)48 Edmonton(COLUMN)clear(COLUMN)75(COLUMN)46 Havana(COLUMN)cloudy(COLUMN)88(COLUMN)75 Kingston(COLUMN)clear(COLUMN)90(COLUMN)75 Mexico City(COLUMN)haze(COLUMN)71(COLUMN)57 Monterrey(COLUMN)clear(COLUMN)98(COLUMN)75 Montreal(COLUMN)clear(COLUMN)73(COLUMN)45 Nassau(COLUMN)pt. cldy(COLUMN)90(COLUMN)73 Ottawa(COLUMN)clear(COLUMN)73(COLUMN)50 Regina(COLUMN)pt. cldy(COLUMN)86(COLUMN)54 St. Kitts(COLUMN)fair(COLUMN)89(COLUMN)78 St. Thomas(COLUMN)fair(COLUMN)90(COLUMN)76 Toronto(COLUMN)cloudy(COLUMN)73(COLUMN)48 Vancouver(COLUMN)clear(COLUMN)73(COLUMN)54 Veracruz(COLUMN)pt. cldy(COLUMN)88(COLUMN)75 Winnipeg(COLUMN)clear(COLUMN)84(COLUMN)61(END TABLE)