Extended Area Forecast for Tuesday through Thursday: Partly cloudy through the period. Highs will range from near 60 on Tuesday, to the low 70s by Thursday to the 50s. Normal Washington temperatures for the period are a high of 63 and a low of 44. Lows will be from the mid 40s.

The National Weather Forecast for today - There will be rain from nothern California to Washington and eastward to South Dakota through Texas. Isolated showers are possible from Florida through eastern Virginia. Temperatures will be mild along the southern California coast, over portions of the northern Plains, over the coastal areas from Texas through South Carolina, and over Florida and most of Georgia. The remainder of the nation can expect conditions to be mostly cool, with frost likely in portions of the interior of New York.

The Council of Governments' Air Quality Index for yesterday showed the high reading in the Washington area during the 9 a.m. to 10 a.m. period was 15 for the pollutant, sulfur dioxide. Index values between zero and 24 indicate good air quality. When the index exceeds 100 the air is considered very unhealthy and individuals with lung, heart and and eye ailments are urged to [WORD ILLEGIBLE] their activity. The forecast for today indicates that the air quality will deteriorate.

The National Weather Service forecasts the Potomac River stage at Little Falls should be near 4 feet today.

Almanac Data for Today

Sun rises 6:33 a.m., sets 5:10 p.m., moon rises 7:57 p.m., sets 9:40 a.m. Tides; high 9:55 a.m. and 10:13 p.m.; low 4:39 a.m. and 4:41 p.m. High and low tides at the following locations can be obtained by subtracting the hours indicated from the tides above. Annapolis (1 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).

Washington: Today - Sunny, high in the low 60s, low near 50. The chance of rain is 10 per cent through tonight. Monday - Partly cloudy, high in the low 40s.

Maryland and Virginia: Today - Partly cloudy, highs in the 60s, lows from the mid 40s to the mid 50s. Monday - Partly cloudy, highs in the 60s.

Lower Potomac and Chesapeake Bay: Today - Fair, visibility of more than 5 miles. Wind will be from the northeast at less than 14 knots. Waves in unprotected waters will be less than 1 foot. Local Temp., Humidity(TABLE) Time(COLUMN)T.(COLUMN)H. 12 midn.(COLUMN)60(COLUMN)58 1 a.m.(COLUMN)59(COLUMN)60 2 a.m.(COLUMN)59(COLUMN)60 3 a.m.(COLUMN)59(COLUMN)60 4 a.m.(COLUMN)58(COLUMN)62 5 a.m.(COLUMN)58(COLUMN)62 6 a.m.(COLUMN)58(COLUMN)62 7 a.m.(COLUMN)57(COLUMN)64 8 a.m.(COLUMN)57(COLUMN)64 9 a.m.(COLUMN)57(COLUMN)64 10 a.m.(COLUMN)58(COLUMN)62 11 a.m.(COLUMN)60(COLUMN)58 12 noon(COLUMN)63(COLUMN)54 1 p.m.(COLUMN)64(COLUMN)50 2 p.m.(COLUMN)64(COLUMN)48 3 p.m.(COLUMN)66(COLUMN)47 4 p.m.(COLUMN)67(COLUMN)40 5 p.m.(COLUMN)65(COLUMN)43 6 p.m.(COLUMN)62(COLUMN)52(END TABLE) Temperatures ending 8 p.m. (EDT)yesterday(TABLE) City(COLUMN)H.(COLUMN)L. Albany(COLUMN)65(COLUMN)38 Albuquerque(COLUMN)73(COLUMN)44 Amarillo(COLUMN)75(COLUMN)49 Anchorage(COLUMN)35(COLUMN)32 Asheville(COLUMN)73(COLUMN)53 Atlanta(COLUMN)79(COLUMN)57 Atlantic City(COLUMN)68(COLUMN)56 Austin(COLUMN)84(COLUMN)66 Baltimore(COLUMN)72(COLUMN)54 Billings(COLUMN)72(COLUMN)47 Birmingham(COLUMN)74(COLUMN)56 Bismarck(COLUMN)66(COLUMN)52 Boise(COLUMN)60(COLUMN)50 Boston(COLUMN)67(COLUMN)45 Brownsville(COLUMN)83(COLUMN)62 Buffalo(COLUMN)59(COLUMN)35 Burlington(COLUMN)55(COLUMN)30 Casper(COLUMN)69(COLUMN)52 Charleston, S.C.(COLUMN)74(COLUMN)62 Charleston, W.Va.(COLUMN)61(COLUMN)40 Charlotte(COLUMN)77(COLUMN)60 Cheyenne(COLUMN)69(COLUMN)38 Chicago(COLUMN)59(COLUMN)45 Cincinnati(COLUMN)62(COLUMN)42 Cleveland(COLUMN)59(COLUMN)42 Columbia, S.C.(COLUMN)77(COLUMN)57 Columbus(COLUMN)64(COLUMN)40 Dal. Ft. Worth(COLUMN)76(COLUMN)56 Dayton(COLUMN)66(COLUMN)38 Denver(COLUMN)76(COLUMN)44 Des Moines(COLUMN)61(COLUMN)54 Detroit(COLUMN)61(COLUMN)39 Duluth(COLUMN)60(COLUMN)40 El Paso(COLUMN)82(COLUMN)50 Fairbanks(COLUMN)24(COLUMN)15 Fargo(COLUMN)65(COLUMN)54 Flagstaff(COLUMN)64(COLUMN)36 Great Falls(COLUMN)69(COLUMN)41 Hartford(COLUMN)71(COLUMN)40 Helena(COLUMN)58(COLUMN)38 Honolulu(COLUMN)85(COLUMN)77 Houston(COLUMN)87(COLUMN)69 Indianapolis(COLUMN)67(COLUMN)44 Jackson, Miss.(COLUMN)74(COLUMN)51 Jacksonville(COLUMN)77(COLUMN)55 Juneau(COLUMN)45(COLUMN)43 Kansas City(COLUMN)66(COLUMN)53 Las Vegas(COLUMN)82(COLUMN)62 Little Rock(COLUMN)74(COLUMN)58 Los Angeles(COLUMN)72(COLUMN)55 Louisville(COLUMN)51(COLUMN)45 Memphis(COLUMN)79(COLUMN)61 Miami Beach(COLUMN)85(COLUMN)66 Midland-Odessa(COLUMN)86(COLUMN)55 Milwaukee(COLUMN)56(COLUMN)38 Mpls.-St. Paul(COLUMN)63(COLUMN)44 Nashville(COLUMN)71(COLUMN)52 New Orleans(COLUMN)75(COLUMN)55 New York(COLUMN)68(COLUMN)48 Norfolk(COLUMN)70(COLUMN)60 North Platte(COLUMN)52(COLUMN)39 Oklahoma City(COLUMN)75(COLUMN)55 Omaha(COLUMN)65(COLUMN)55 Orlando(COLUMN)83(COLUMN)57 Philadelphia(COLUMN)71(COLUMN)49 Phoenix(COLUMN)89(COLUMN)67 Pittsburgh(COLUMN)64(COLUMN)39 Portland, Maine(COLUMN)65(COLUMN)30 Portland, Ore.(COLUMN)53(COLUMN)49 Providence(COLUMN)70(COLUMN)44 Raleigh(COLUMN)75(COLUMN)55 Rapid City(COLUMN)73(COLUMN)45 Reno(COLUMN)58(COLUMN)39 Richmond(COLUMN)74(COLUMN)56 St. Louis(COLUMN)68(COLUMN)51 St. Prbg.-Tampa(COLUMN)82(COLUMN)60 Salt Lake City(COLUMN)75(COLUMN)59 San Antonio(COLUMN)80(COLUMN)68 San Diego(COLUMN)70(COLUMN)61 San Franciso(COLUMN)65(COLUMN)55 San Juan(COLUMN)89(COLUMN)76 St. Ste. Marie(COLUMN)54(COLUMN)36 Seattle(COLUMN)56(COLUMN)48 Shreveport(COLUMN)85(COLUMN)60 Sioux Falls(COLUMN)57(COLUMN)50 Spokane(COLUMN)43(COLUMN)39 Syracuse(COLUMN)62(COLUMN)41 Topeka(COLUMN)67(COLUMN)56 Tucson(COLUMN)83(COLUMN)63 Tulsa(COLUMN)72(COLUMN)53 Washington(COLUMN)74(COLUMN)57 Wichita(COLUMN)74(COLUMN)57(END TABLE) Temperatures Abroad Yesterday(TABLE) City(COLUMN)Weather(COLUMN)Time(COLUMN)Temp Aberdeen(COLUMN)cloudy(COLUMN) 1 p.m.(COLUMN)57 Amsterdam(COLUMN)cloudy(COLUMN) 1 p.m.(COLUMN)54 Ankara(COLUMN)clear(COLUMN) 3 p.m.(COLUMN)57 Athens(COLUMN)clear(COLUMN) 2 p.m.(COLUMN)72 Auckland(COLUMN)pt. cldy.(COLUMN)midnight(COLUMN)52 Berlin(COLUMN)clear(COLUMN) 1 p.m.(COLUMN)57 Birmingham(COLUMN)cloudy(COLUMN) 1 p.m.(COLUMN)54 Brussels(COLUMN)pt. cldy.(COLUMN) 1 p.m.(COLUMN)50 Casablanca(COLUMN)pt. cldy.(COLUMN)noon(COLUMN)70 Copenhagen(COLUMN)clear(COLUMN) 1 p.m.(COLUMN)57 Dublin(COLUMN)cloudy(COLUMN) 1 p.m.(COLUMN)57 Geneva(COLUMN)clear(COLUMN) 1 p.m.(COLUMN)52 Hong Kong(COLUMN)clear(COLUMN) 8 p.m.(COLUMN)77 Lisbon(COLUMN)pt. cldy.(COLUMN)noon(COLUMN)68 London(COLUMN)cloudy(COLUMN) 1 p.m.(COLUMN)59 Madrid(COLUMN)clear(COLUMN) 1 p.m.(COLUMN)63 Malta(COLUMN)pt. cldy.(COLUMN) 1 p.m.(COLUMN)73 Manila(COLUMN)cloudy(COLUMN) 8 p.m.(COLUMN)81 Moscow(COLUMN)cloudy(COLUMN) 3 p.m.(COLUMN)43 New Delhi(COLUMN)clear(COLUMN) 5 p.m.(COLUMN)84 Nice(COLUMN)pt. cldy.(COLUMN) 1 p.m.(COLUMN)66 Oslo(COLUMN)clear(COLUMN) 1 p.m.(COLUMN)54 Paris(COLUMN)rain(COLUMN) 1 p.m.(COLUMN)54 Peking(COLUMN)clear(COLUMN) 8 p.m.(COLUMN)50 Rome(COLUMN)pt. cldy.(COLUMN) 1 p.m.(COLUMN)72 Saigon(COLUMN)cloudy(COLUMN) 8 p.m.(COLUMN)79 Sofia(COLUMN)clear(COLUMN) 2 p.m.(COLUMN)64 Stockholm(COLUMN)clear(COLUMN) 1 p.m.(COLUMN)50 Sydney(COLUMN)cloudy(COLUMN)10 p.m.(COLUMN)63 Tel Aviv(COLUMN)pt. cldy.(COLUMN) 2 p.m.(COLUMN)73 Tokyo(COLUMN)haze(COLUMN) 9 p.m.(COLUMN)66 Tunis(COLUMN)clear(COLUMN) 1 p.m.(COLUMN)75 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)clear(COLUMN)89(COLUMN)77 Barbados(COLUMN)cloudy(COLUMN)85(COLUMN)77 Bermuda(COLUMN)clear(COLUMN)80(COLUMN)74 Bogota(COLUMN)pt. cldy.(COLUMN)56(COLUMN)48 Calgary(COLUMN)pt. cldy.(COLUMN)59(COLUMN)41 Edmonton(COLUMN)clear(COLUMN)59(COLUMN)37 Havana(COLUMN)clear(COLUMN)85(COLUMN)72 Kingston(COLUMN)clear(COLUMN)89(COLUMN)79 Montego Bay(COLUMN)pt. cldy.(COLUMN)85(COLUMN)75 Mexico City(COLUMN)haze(COLUMN)75(COLUMN)55 Monterrey(COLUMN)clear(COLUMN)82(COLUMN)68 Montreal(COLUMN)clear(COLUMN)57(COLUMN)34 Nassau(COLUMN)clear(COLUMN)86(COLUMN)66 Ottawa(COLUMN)clear(COLUMN)57(COLUMN)34 Regina(COLUMN)pt. cldy.(COLUMN)66(COLUMN)34 St. Kitts(COLUMN)cloudy(COLUMN)88(COLUMN)77 Toronto(COLUMN)cloudy(COLUMN)57(COLUMN)34 Vancouver(COLUMN)cloudy(COLUMN)55(COLUMN)48 Veracruz(COLUMN)pt. cldy.(COLUMN)88(COLUMN)68 Winnipeg(COLUMN)cloudy(COLUMN)61(COLUMN)46(END TABLE)