Washington: Today - Rain, high in 60s, low in 50s. Chance of rain 90 per cent today, 70 per cent tonight. Monday - Partly cloudy, high in 60s.

Maryland: Today - Rain, high in 60s, low in 40s. Monday - Partly cloudy, highs in 50s and 60s.

Virigina: Today - Rain, high near 70, low near 50. Monday - Partly cloudy, high near 70.

Lower Potomac and Chesapeake Bay: Today - Rain, southerly winds 12 to 22 knots today, west to north-westerly winds at 10 to 20 knots tonight with visibility of 2 miles or less tonight.

Extended Area Outlook: For Tuesday through Thursday - Chance of rain Wednesday with partly cloudy skies Tuesday and Thursday. Highs should average in 60s, lows in 40s. Washington's normal temperature range for this time of year is from 55 to 35.

West Virginia: Today - Rain, high in upper 50s to mind 60s, low in mid 30s to mid 40s. Monday - Partly cloudy, high in mid 50s to mid 60s.

The National Weather Forecast for today - Showers and thunder showers will be experienced from Florida across extreme eastern Georgia - the Carolinas - the central Atlantic Coast states and West Virginia. Rainshowers will fall across most of the northern Atlantic Coast states - the Great Lakes region and the upper One River Valley. Widely scattered showers will reach from Montana across the northern Rockies - the central plateau and northern California - becoming more numerous across the Pacific Northwest. Elsewhere - fair or partly cloudy skies are forecast. It will be cooler across the southern pacific states - the north and central Atlantic Coast states - the Ohio Valley and the lower Great Lakes region. It will be warmer from western Texas and Oklahoma into the western portions of the northern and central Plains. Elsewhere - little temperature change is forecast.

ALMANAC DATA FOR Sunday, March 13 Sun rises 6:23 a.m., sets 6:13 p.m., moon rises 2:41 a.m., sets 12:19 p.m. Tides High 2:01 a.m. and 2:35 p.m., low 8:57 a.m. and 9:40 p.m. High and low tides at the following points can be obtained by subtracting the hours indicated from the tides above. Annapolis (3 1/4); Bloody Point Lighthouse (4 1/2); Deale, Md. (4 1/2); Colonial Beach (6); Norfolk (1 1/2); Virginia Beach (1); Solomon's Island (6 1/2); Point Lookout (7).

The Council of Governments' Air Quality Index for yesterday showed the high reading in the Washington area during the 9 to 10 a.m. period was 11 for the pollutant, photochemical oxidants. Index values between 0 and 24 indicate good air quality. When the index exceeds 100 the air becomes hazardous and persons with lung, heart and eye problems should restrict their activity. The forecast for today indicates the air quality will remain the same.

The National Weather Service forecasts that the Potomac River stage at Little Falls will fall slowly to 4.0 feet today. Local Temp., Humidity(TABLE) Time(COLUMN)T.(COLUMN)H. 12 midn.(COLUMN)55(COLUMN)86 1 a.m.(COLUMN)55(COLUMN)90 2 a.m.(COLUMN)55(COLUMN)90 3 a.m.(COLUMN)55(COLUMN)90 4 a.m.(COLUMN)53(COLUMN)90 5 a.m.(COLUMN)54(COLUMN)90 6 a.m.(COLUMN)53(COLUMN)93 7 a.m.(COLUMN)53(COLUMN)93 8 a.m.(COLUMN)54(COLUMN)93 9 a.m.(COLUMN)56(COLUMN)90 10 a.m.(COLUMN)64(COLUMN)73 11 a.m.(COLUMN)64(COLUMN)78 12 noon(COLUMN)67(COLUMN)73 1 p.m.(COLUMN)68(COLUMN)68 2 p.m.(COLUMN)69(COLUMN)66 3 p.m.(COLUMN)70(COLUMN)64 4 p.m.(COLUMN)69(COLUMN)68 5 p.m.(COLUMN)66(COLUMN)75(END TABLE) Temperatures ending 7 a.m. (EST) yesterday:(TABLE) City(COLUMN)H.(COLUMN)L. Albany(COLUMN)70(COLUMN)29 Albuquerque(COLUMN)55(COLUMN)28 Amarillo(COLUMN)41(COLUMN)33 Anchorage(COLUMN)33(COLUMN)13 Asheville(COLUMN)54(COLUMN)53 Atlanta(COLUMN)62(COLUMN)59 Atlantic City(COLUMN)59(COLUMN)40 Austin(COLUMN)72(COLUMN)48 Baltimore(COLUMN)72(COLUMN)43 Billings(COLUMN)46(COLUMN)23 Birmingham(COLUMN)70(COLUMN)66 Bismarck(COLUMN)38(COLUMN)28 Boise(COLUMN)48(COLUMN)37 Boston(COLUMN)65(COLUMN)38 Brownsville(COLUMN)78(COLUMN)51 Buffalo(COLUMN)69(COLUMN)44 Burlington, Vt.(COLUMN)56(COLUMN)32 Casper(COLUMN)37(COLUMN)16 Charltn, S.C.(COLUMN)69(COLUMN)62 Charltn, W.Va.(COLUMN)73(COLUMN)62 Charlotte, N.C.(COLUMN)65(COLUMN)57 Cheyenne(COLUMN)25(COLUMN)20 Chicago(COLUMN)68(COLUMN)61 Cincinnati(COLUMN)74(COLUMN)58 Cleveland(COLUMN)73(COLUMN)53 Columbia, S.C.(COLUMN)75(COLUMN)64 Columbus, Ohio(COLUMN)70(COLUMN)55 Dal.-Ft. Worth(COLUMN)66(COLUMN)45 Dayton(COLUMN)75(COLUMN)56 Denver(COLUMN)35(COLUMN)25 Des Moines(COLUMN)56(COLUMN)46 Detroit(COLUMN)72(COLUMN)46 Duluth(COLUMN)43(COLUMN)37 El Paso(COLUMN)56(COLUMN)34 Fairbanks(COLUMN)07(COLUMN)-18 Fargo(COLUMN)41(COLUMN)36 Flagstaff(COLUMN)46(COLUMN)13 Great Falls(COLUMN)49(COLUMN)36 Hartford(COLUMN)75(COLUMN)35 Helena(COLUMN) - Honolulu(COLUMN)85(COLUMN)72 Houston(COLUMN)70(COLUMN)54 Indianapolis(COLUMN)70(COLUMN)60 Jackson, Miss.(COLUMN)78(COLUMN)54 Jacksonville(COLUMN)79(COLUMN)62 Juneau(COLUMN)39(COLUMN)32 Kansas City(COLUMN)62(COLUMN)45 Las Vegas(COLUMN)63(COLUMN)35 Little Rock(COLUMN)67(COLUMN)44 Los Angeles(COLUMN)70(COLUMN)48 Louisville(COLUMN)77(COLUMN)60 Memphis(COLUMN)73(COLUMN)53 Miami Beach(COLUMN)77(COLUMN)75 Midland(COLUMN)62(COLUMN)34 Milwaukee(COLUMN)53(COLUMN)43 Mpts.-St. Paul(COLUMN)50(COLUMN)47 Nashville(COLUMN)64(COLUMN)61 New Orleans(COLUMN)80(COLUMN)60 New York(COLUMN)73(COLUMN)44 Norfolk(COLUMN)69(COLUMN)50 North Platte(COLUMN)40(COLUMN)29 Oklahoma City(COLUMN)63(COLUMN)42 Omaha(COLUMN)60(COLUMN)46 Orlando(COLUMN)82(COLUMN)66 Philadelphia(COLUMN)72(COLUMN)40 Phoenix(COLUMN)73(COLUMN)47 Pittsburgh(COLUMN)71(COLUMN)51 Portland, Mo.(COLUMN)57(COLUMN)26 Portland, Ore.(COLUMN)56(COLUMN)42 Providence(COLUMN)20(COLUMN)35 Raleigh(COLUMN) -(COLUMN)49 Rapid City(COLUMN)37(COLUMN)29 Reno(COLUMN)55(COLUMN)33 Richmond(COLUMN)75(COLUMN)44 St. Louis(COLUMN)62(COLUMN)51 St. Petersburg(COLUMN)86(COLUMN)72 Salt Lake City(COLUMN)43(COLUMN)29 San Antonio(COLUMN)75(COLUMN)48 San Diego(COLUMN)69(COLUMN)48 San Francisco(COLUMN)63(COLUMN)50 San Juan, P.R.(COLUMN)85(COLUMN)70 St. Ste. Marie(COLUMN)45(COLUMN)37 Seattle(COLUMN)57(COLUMN)44 Shreveport(COLUMN)75(COLUMN)47 Sioux Falls(COLUMN)48(COLUMN)43 Spokane(COLUMN)47(COLUMN)37 Tucson(COLUMN)61(COLUMN)36 Tulsa(COLUMN)66(COLUMN)44 Washington(COLUMN)73(COLUMN)52 Wichita(COLUMN)56(COLUMN)40(END TABLE) Temperatures Abroad Yesterday(TABLE) City(COLUMN)Weather(COLUMN)Time(COLUMN)Temp. Aberdeen(COLUMN)clear(COLUMN)1 p.m.(COLUMN)48 Amsterdam(COLUMN)cloudy(COLUMN)1 p.m.(COLUMN)Ankara pt. cldy(COLUMN)3 p.m.(COLUMN)45 Athen(COLUMN)pt. cldy(COLUMN)2 p.m.(COLUMN)57 Auckland(COLUMN)pt. cldy(COLUMN)midn.(COLUMN)Berlin cloudy(COLUMN)1 p.m.(COLUMN)Birmingham(COLUMN)pt. cldy 1 p.m.(COLUMN)Brussels(COLUMN)pt. cldy(COLUMN)1 p.m. Cairo(COLUMN)pt. cldy(COLUMN)2 p.m.(COLUMN)Casablanca(COLUMN)pt. cldy noon(COLUMN)63 Copenhagen(COLUMN)cloudy(COLUMN)1 p.m.(COLUMN)50 Dublia(COLUMN)pt. cldy(COLUMN)1 p.m.(COLUMN)48 Geneva(COLUMN)cloudy(COLUMN)1 p.m.(COLUMN)48 Hong Kong(COLUMN)pt. cldy(COLUMN)8 p.m.(COLUMN)66 Lisbon(COLUMN)clear(COLUMN)noon(COLUMN)London pt. cldy(COLUMN)1 p.m.(COLUMN)52 Madrid(COLUMN)pt. cldy(COLUMN)1 p.m.(COLUMN)50 Malta(COLUMN)clear(COLUMN)1 p.m.(COLUMN)70 Manlia(COLUMN)pt. cldy(COLUMN)8 p.m.(COLUMN)77 Moscow(COLUMN)cloudy(COLUMN)3 p.m.(COLUMN)39 Mew Delhi(COLUMN)clear(COLUMN)5 p.m.(COLUMN)88 Nice(COLUMN)pt. cldy(COLUMN)1 p.m.(COLUMN)55 Oslo(COLUMN)pt. cldy(COLUMN)1 p.m.(COLUMN)34 Paris(COLUMN)pt. cldy(COLUMN)1 p.m.(COLUMN)48 Peking(COLUMN)cloudy(COLUMN)8 p.m.(COLUMN)41 Rome(COLUMN)pt. cldy(COLUMN)1 p.m.(COLUMN)61 Saigon(COLUMN)cloudy(COLUMN)9 p.m.(COLUMN)81 Sofia(COLUMN)cloudy(COLUMN)2 p.m.(COLUMN)54 Stockholm(COLUMN)clear(COLUMN)1 p.m.(COLUMN)43 Sydney(COLUMN)cloudy(COLUMN)10 p.m.(COLUMN)72 Tel Aviv(COLUMN)cloudy(COLUMN)2 p.m.(COLUMN)61 Tokyo(COLUMN)clear(COLUMN)9 p.m.(COLUMN)50 Tunis(COLUMN)clear(COLUMN)1 p.m.(COLUMN)70 Vienna(COLUMN)clear(COLUMN)1 p.m.(COLUMN)63 Warsaw(COLUMN)clear(COLUMN)1 p.m.(COLUMN)57(END TABLE) Temperatures (Western Hemisphere)(TABLE) City(COLUMN)Weather(COLUMN)High(COLUMN)Low Acapulco(COLUMN)cloudy(COLUMN)88(COLUMN)72 Barbados(COLUMN)cloudy(COLUMN)85(COLUMN)73 Bermuda(COLUMN)pt. cldy(COLUMN)68(COLUMN)63 Calgary(COLUMN)pt. cldy(COLUMN)45(COLUMN)36 Edmonton(COLUMN)cloudy(COLUMN)39(COLUMN)34 Havana(COLUMN)cloudy(COLUMN)88(COLUMN)73 Kingston(COLUMN)pt. cldy(COLUMN)88(COLUMN)73 Montego Bay(COLUMN)sunny(COLUMN)90(COLUMN)70 Mexico City(COLUMN)pt. cldy(COLUMN)81(COLUMN)48 Monterrery(COLUMN)sundy(COLUMN)77(COLUMN)46 Montreal(COLUMN)cloudy(COLUMN)52(COLUMN)30 Nassau(COLUMN)sunny(COLUMN)84(COLUMN)72 Ottawa(COLUMN)pt. cldy(COLUMN)52(COLUMN)34 Regina(COLUMN)clear(COLUMN)45(COLUMN)23 St. Kitts(COLUMN)sunny(COLUMN)85(COLUMN)74 St. Thomas(COLUMN)sunny(COLUMN)86(COLUMN)74 Toronto(COLUMN)cloudy(COLUMN)59(COLUMN)32 Vancouver(COLUMN)pt. cldy(COLUMN)52(COLUMN)37 Veracruz(COLUMN)cloudy(COLUMN)99(COLUMN)70 Winnipeg(COLUMN)pt. cldy(COLUMN)37(COLUMN)23(END TABLE)