Washington: Today - Partly sunny, high in the mid 40s, low near 30. The chance of rain is near zero through tonight. Monday - Sunny, high near 50.

Maryland and Virginia: Today - Sunny, highs from the low 30s in the mountains to the upper 40s elsewhere, lows from the mid teens to the mid 20s. There is a chance of snow flurries in the mountains. Monday - Sunny, highs from the upper 30s to the upper 40s.

Lower Potomac and Chesapeake Bay: Today - Fair with visibility of more than 5 miles. Wind will be from the northwest at from 15 to 25 knots. Waves in unprotected waters will be less than 3 feet.

Extended Area Forecast for Tuesday through Thursday: Fair through the period. Highs will range from the upper 40s on Tuesday, to the low 60s by Thursday, lows from the upper 20s to the mid 40s. Normal Washington temperatures for the period are a high of 58 and a low of 39.

The National Weather Forecast for today - Showers will spread from the northern and central Pacific Coast into the northern plateau and extreme northern Rocky Mountains. Snow will fall from northern New England to the eastern section of the Great Lakes. Clear or partly cloudy skies will prevail across the remainder of the nation. Temperatures will be colder along the New England coast and continued cold over the Northeast. The Southeast will remain cool. Warmer temperatures will move into the upper Mississippi Valley, and mild weather will prevail from the Plains into the Rockies. Slightly cooler temperatures are expected along the northern and central Pacific Coast.

The Council of Governments' Air Quality Index for yesterday showed the high reading in the Washington area during the 9 a.m. to 10 p.m. period was 15 for the pollutant, photochemical oxidants. 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 eye ailments are urged to restrict their activity. The forecast for today indicates that the air quality will be good.

The National Weather Service forecasts the Potomac River stage at Little Falls should be near 5 feet today.

Almanac Data for today - Sun rises 6:48 a.m., sets 5:56 p.m.; moon rises 9:13 a.m., sets 7:32 p.m. Tides: High, 9:11 a.m. and 9:37 p.m.; low, 3:42 a.m. and 3:50 p.m. High and low tides at the following locations may 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, (1), Solomon's Island (6 1/2), Point Lookout (7). Local Temp., Humidity(TABLE) Time(COLUMN)T.(COLUMN)H. 12 midnt.(COLUMN)42(COLUMN)45 1 a.m.(COLUMN)42(COLUMN)47 2 a.m.(COLUMN)41(COLUMN)47 3 a.m.(COLUMN)41(COLUMN)47 4 a.m.(COLUMN)41(COLUMN)45 5 a.m.(COLUMN)40(COLUMN)43 6 a.m.(COLUMN)40(COLUMN)61 7 a.m.(COLUMN)38(COLUMN)46 8 a.m.(COLUMN)40(COLUMN)43 9 a.m.(COLUMN)45(COLUMN)37 10 a.m.(COLUMN)45(COLUMN)37 11 a.m.(COLUMN)46(COLUMN)37 12 noon(COLUMN)46(COLUMN)37 1 p.m.(COLUMN)46(COLUMN)25 2 p.m.(COLUMN)45(COLUMN)37 3 p.m.(COLUMN)45(COLUMN)37 4 p.m.(COLUMN)44(COLUMN)47 5 p.m.(COLUMN)42(COLUMN)47 6 p.m.(COLUMN)40(COLUMN)50(END TABLE) Temperatures ending 8 a.m. (EST) yesterday:(TABLE) City(COLUMN)H.(COLUMN)L. Albany(COLUMN)50(COLUMN)29 Albuquerque(COLUMN)58(COLUMN)32 Amarillo(COLUMN)66(COLUMN)36 Anchorage(COLUMN)20(COLUMN)07 Asheville(COLUMN)52(COLUMN)30 Atlanta(COLUMN)56(COLUMN)32 Atlantic City(COLUMN)47(COLUMN)42 Austin(COLUMN)70(COLUMN)45 Baltimore(COLUMN)50(COLUMN)34 Billings(COLUMN)66(COLUMN)48 Birmingham(COLUMN)58(COLUMN)31 Bismarck(COLUMN)34(COLUMN)19 Boise(COLUMN)62(COLUMN)38 Boston(COLUMN)67(COLUMN)37 Brownsville(COLUMN)75(COLUMN)44 Buffalo(COLUMN)39(COLUMN)31 Burlington, Vt.(COLUMN)51(COLUMN)35 Casper(COLUMN)55(COLUMN)39 Charleston, S.C.(COLUMN)60(COLUMN)38 Charleston, W.V.(COLUMN)46(COLUMN)29 Charlotte(COLUMN)58(COLUMN)28 Cheyenne(COLUMN)56(COLUMN)34 Chicago(COLUMN)38(COLUMN)27 Cincinnati(COLUMN)45(COLUMN)21 Cleveland(COLUMN)43(COLUMN)33 Columbia, S.C.(COLUMN)59(COLUMN)27 Columbus(COLUMN)40(COLUMN)27 Dal.-Ft. Worth(COLUMN)71(COLUMN)41 Dayton(COLUMN)39(COLUMN)27 Denver(COLUMN)62(COLUMN)37 Des Monies(COLUMN)43(COLUMN)24 Detroit(COLUMN)37(COLUMN)25 Duluth(COLUMN)29(COLUMN)12 El Paso(COLUMN)67(COLUMN)33 Fairbanks(COLUMN) 2(COLUMN)-8 Fargo(COLUMN)31(COLUMN)15 Flagstaff(COLUMN)59(COLUMN)29 Great Falls(COLUMN)67(COLUMN)44 Hartford(COLUMN)69(COLUMN)28 Helena(COLUMN)53(COLUMN)27 Honolulu(COLUMN)85(COLUMN)74 Houston(COLUMN)69(COLUMN)53 Indianapolis(COLUMN)43(COLUMN)26 Jackson, Miss.(COLUMN)65(COLUMN)32 Jacksonville(COLUMN)61(COLUMN)33 Juneau(COLUMN)37(COLUMN)27 Kansas City(COLUMN)50(COLUMN)26 Las Vegas(COLUMN)74(COLUMN)46 Little Rock(COLUMN)64(COLUMN)41 Los Angeles(COLUMN)81(COLUMN)55 Louisville(COLUMN)49(COLUMN)28 Memphis(COLUMN)63(COLUMN)39 Midland-Odessa(COLUMN)67(COLUMN)35 Milwaukee(COLUMN)38(COLUMN)25 Mpls.-St. Paul(COLUMN)33(COLUMN)17 Nashville(COLUMN)56(COLUMN)28 New Orleans(COLUMN)64(COLUMN)42 New York(COLUMN)57(COLUMN)37 Norfolk(COLUMN)56(COLUMN)37 North Platte(COLUMN)58(COLUMN)24 Oklahoma City(COLUMN)67(COLUMN)35 Omaha(COLUMN)39(COLUMN)22 Orlando(COLUMN)64(COLUMN)47 Philadelphia(COLUMN)47(COLUMN)29 Phoenix(COLUMN)85(COLUMN)62 Pittsburgh(COLUMN)38(COLUMN)29 Portland, Maine(COLUMN)62(COLUMN)23 Portland, Ore.(COLUMN)56(COLUMN)45 Providence(COLUMN)65(COLUMN)21 Raleigh(COLUMN)56(COLUMN)26 Rapid City(COLUMN)47(COLUMN)17 Rapid City(COLUMN)47(COLUMN)27 Reno(COLUMN)68(COLUMN)21 Richmond(COLUMN)56(COLUMN)31 St. Louis(COLUMN)49(COLUMN)25 St. Prbg.-Tampa(COLUMN)62(COLUMN)45 Salt Lake City(COLUMN)59(COLUMN)31 San Antonio(COLUMN)66(COLUMN)34 San Diego(COLUMN)78(COLUMN)55 San Francisco(COLUMN)67(COLUMN)55 San Juan(COLUMN)87(COLUMN)76 St. Ste. Marie(COLUMN)35(COLUMN)21 Seattle(COLUMN)56(COLUMN)46 Shreveport(COLUMN)73(COLUMN)36 Sioux Falls(COLUMN)31(COLUMN)14 Spokane(COLUMN)52(COLUMN)39 Syracuse(COLUMN)43(COLUMN)36 Topeka(COLUMN)53(COLUMN)27 Tucson(COLUMN)79(COLUMN)54 Tulsa(COLUMN)65(COLUMN)33 Washington(COLUMN)53(COLUMN)38 Wichita(COLUMN)60(COLUMN)33(END TABLE) Temperatures Abroad Yesterday(TABLE) City(COLUMN)Weather(COLUMN)Time(COLUMN)Temp. Aberdeen(COLUMN) cloudy(COLUMN) 1 p.m.(COLUMN)43 Amsterdam(COLUMN)pt. cldy.(COLUMN) 1 p.m.(COLUMN)50 Ankara(COLUMN) clear(COLUMN) 3 p.m.(COLUMN)46 Athens(COLUMN) clear(COLUMN) 2 p.m.(COLUMN)66 Auckland(COLUMN) clear(COLUMN)midnight(COLUMN)57 Berlin(COLUMN) cloudy(COLUMN) 1 p.m.(COLUMN)48 Birmingham(COLUMN)pt. cldy.(COLUMN) 1 p.m.(COLUMN)43 Brussels(COLUMN) cloudy(COLUMN) 1 p.m.(COLUMN)48 Casablanca(COLUMN) clear(COLUMN) noon(COLUMN)70 Copenhagen(COLUMN)pt. cldy.(COLUMN) 1 p.m.(COLUMN)46 Dublin(COLUMN)pt. cldy.(COLUMN) 1 p.m.(COLUMN)41 Geneva(COLUMN) cloudy(COLUMN) 1 p.m.(COLUMN)54 Hong Kong(COLUMN)pt. cldy(COLUMN) 8 p.m.(COLUMN)70 Lisbon(COLUMN)pt. cldy.(COLUMN) noon(COLUMN)66 London(COLUMN)pt. cldy.(COLUMN) 1 p.m.(COLUMN)48 Madrid(COLUMN) clear(COLUMN) 1 p.m.(COLUMN)63 Malta(COLUMN) clear(COLUMN) 1 p.m.(COLUMN)70 Manila(COLUMN)pt. cldy.(COLUMN) 8 p.m.(COLUMN)81 Moscow(COLUMN) cloudy(COLUMN) 3 p.m.(COLUMN)45 New Delhi(COLUMN) clear(COLUMN) 5 p.m.(COLUMN)77 Nice(COLUMN) clear(COLUMN) 1 p.m.(COLUMN)63 Oslo(COLUMN)pt. cldy.(COLUMN) 1 p.m.(COLUMN)46 Paris(COLUMN)pt. cldy.(COLUMN) 1 p.m.(COLUMN)55 Peking(COLUMN)pt. cldy.(COLUMN) 8 p.m.(COLUMN)37 Rome(COLUMN) clear(COLUMN) 1 p.m.(COLUMN)66 Saigon(COLUMN) cloudy(COLUMN) 1 p.m.(COLUMN)81 Sofia(COLUMN) clear(COLUMN) 2 p.m.(COLUMN)61 Stockholm(COLUMN) cloudy(COLUMN) 1 p.m.(COLUMN)48 Sydney(COLUMN)pt. cldy.(COLUMN)10 p.m.(COLUMN)63 Tel Aviv(COLUMN) clear(COLUMN) 2 p.m.(COLUMN)70 Tokyo(COLUMN)pt. cldy.(COLUMN) 9 p.m.(COLUMN)50 Tunis(COLUMN) clear(COLUMN) 1 p.m.(COLUMN)70 Vienna(COLUMN) cloudy(COLUMN) 1 p.m.(COLUMN)61 Warsaw(COLUMN)pt. cldy.(COLUMN) 1 p.m.(COLUMN)59(END TABLE) Temperatures (Western Hemisphere)(TABLE) City(COLUMN)Weather(COLUMN)High(COLUMN)Low Acapulco(COLUMN) sunny(COLUMN)91(COLUMN)78 Barbados(COLUMN)pt. cldy.(COLUMN)86(COLUMN)77 Bermuda(COLUMN)pt. cldy.(COLUMN)78(COLUMN)72 Bogota(COLUMN) rain(COLUMN)63(COLUMN)50 Calgary(COLUMN) clear(COLUMN)52(COLUMN)34 Culiacan(COLUMN) sunny(COLUMN)93(COLUMN)64 Edmonton(COLUMN) cloudy(COLUMN)46(COLUMN)41 Havana(COLUMN)pt. cldy.(COLUMN)77(COLUMN)66 Kingston(COLUMN)pt. cldy.(COLUMN)91(COLUMN)71 Montego Bay(COLUMN)pt. cldy.(COLUMN)89(COLUMN)77 Mexico City(COLUMN) haze(COLUMN)60(COLUMN)48 Monterrey(COLUMN) cloudy(COLUMN)68(COLUMN)50 Montreal(COLUMN) cloudy(COLUMN)45(COLUMN)39 Nassau(COLUMN) cloudy(COLUMN)75(COLUMN)71 Ottawa(COLUMN) snow(COLUMN)41(COLUMN)30 Regina(COLUMN) clear(COLUMN)36(COLUMN)25 St. Kitts(COLUMN)pt. cldy.(COLUMN)88(COLUMN)77 St. Thomas(COLUMN)pt. cldy.(COLUMN)85(COLUMN)77 Toronto(COLUMN) cloudy(COLUMN)39(COLUMN)27 Vancouver(COLUMN) clear(COLUMN)55(COLUMN)41 Veracruz(COLUMN)pt. cldy.(COLUMN)75(COLUMN)70 Winnipeg(COLUMN) clear(COLUMN)30(COLUMN)19(END TABLE)