Washington: Today -- Becoming cloudy, with a chance of rain tonight. High in the low to mid 40s, low in the mid 30s. Winds will be from the south at about 10 mph Sunday -- Cloudy, with rain probable high in the mid 40s.

Maryland and Virginia: Cloudy with a chance of rain tonight, highs from the low to mid 40s, lows from the low to mid 30s. Sunday -- Rain probable, highs from the mid 40s to near 50.

Extended Area Forecast for Monday through Wednesday -- Chance of rain Monday and Tuesday, fair on Wednesday, Highs from the mid 30s to the mid 40s, lows from the mid 20s to the low 30s.

Lower Potomac and Chesapeake Bay -- Chance of rain tonight, with good visibility today, becoming poor tonight. Winds will be from the south at aroumd 10 mph. Waves will average 1 foot or less.

West Virginia: Today -- Rain developing, highs near 50, lows from the low 20s to the low 30s. Sunday -- Rain continuing, highs from the mid 40s to mear 50.

The Nation Yesterday: Bitter cold and snow over the northern Plains moved southeastward into the Mississippl Valley and the southern Plains. Snow over Montana and much of North Dakota ended, but a new band of snow reached from northwestern Iowa into the western northwestern Iowa into the western Great Lakes. Snow, blown and drifted by gusty winds, also reached from eastern Wyoming into the western South Dakota and Nebraska. Rain stretched from the lower half of the Mississippi Valley into the lower Ohio Valley, with rainshowers dotting southern Florida and southern Arizona. Bone chilling, cold gripped the northern mountains, Montana, and the northern Great Plains. A number of cities in western Montana remained blow zero today. While parts of the north and northwest shivered, warm temperatures in the 70s continued over south Texas and southern Florida.

The National Weather Forecast for today: Snow will fall over western portions of the Great Lakes into the northern sections of the Mississippi Valley. Freezing rain will reach from northwest Arkansas into eastern Missouri. Scattered showers and thunderstorms will cover eastern Texas and western Louisiana, and scattered showers will dampen Florida. Rain will stretch from the lower Mississippi Valley and the eastern Gulf Coast over the Tennessee and Ohio Valleys through the lower Great Lakes and the Appalachians. Showers and snow over the central Arizona mountains will cover Arizona and the southern Rockies. It will be very cold in the northern half of the intermountain region, the northern half of the Rockies, and in most of the Great Plains. It will be mild over the Ohio Valley, most of the Great Lakes, Louisiana and Texas. Elsewhere will be seasonably cold.

Almanac Data for today: The sun rises 7:26 a.m., set 4:55 p.m: moon rises 7:52 a.m., sets 6:20 p.m. Tides; 8:05 a.m. and 8:32 p.m. low 2:37 a.m. and 2:47 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 1/2), Norfolk (1), Virginia Beach (3/4), Solomons Island (6 1/4), Point Lookout (7).

The Council of Government's Air Quality Index for yesterday showed the high reading in the Washington area during the 3 p.m. period was 9 for the pollutant, carbon monoxide. 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 continue to be good.

The National Weather Service forecasts the Potomac River stage at Little Falls should remain at 4.4 feet today.

Washington data for yesterday: Highest temperature since midnight yesterday, 38 degrees at 2:50 p.m. Lowest temperature since midnight, 22 degrees at 7:15 a.m. Excess of temperature since Dec. 1, 178 degrees. Excess of temperature since Jan. 1, 394 degrees. Record high temperature for today, 68 degrees in 1971. Record low temperature for today, -07 degrees in 1880. Relative humidity: maximum, 65 percent at 2:00 a.m.; minimum, 34 percent at 4:00 p.m. 24 hour precipitation, none. Excess of precipitation since Dec. 1,.66 inches. Excess of precipitation since Jan. 1, 49 inches. Highest observed wind since 7 a.m., 12 miles per hour from the northeast at 9:00 a.m. Peak gust since 7 a.m., 20 miles per hour from the northeast at 8:03 a.m.

Local Temp., Humidity (TABLE) Time(COLUMN)T.(COLUMN)H. 12 mid.(COLUMN)29(COLUMN)51 1 a.m.(COLUMN)27(COLUMN)58 1 a.m.(COLUMN)24(COLUMN)65 3a.m.(COLUMN)26(COLUMN)63 4 a.m.(COLUMN)24(COLUMN)65 5 a.m.(COLUMN)25(COLUMN)63 6 a.m. (COLUMN)24(COLUMN)60 7 a.m.(COLUMN)24(COLUMN)60 8 a.m.(COLUMN)25(COLUMN)60 9 a.m.(COLUMN)27(COLUMN)55 10 a.m.(COLUMN)30(COLUMN)51 11 a.m.(COLUMN)31(COLUMN)47 12 noon(COLUMN)33(COLUMN)43 1 p.m.(COLUMN)35(COLUMN)42 2 p.m.(COLUMN)37(COLUMN)39 3 p.m.(COLUMN)38(COLUMN)35 4 p.m.(COLUMN)38(COLUMN)34 5 p.m.(COLUMN)37(COLUMN)37 6 p.m.(COLUMN)36(COLUMN)40 7 p.m.(COLUMN)33(COLUMN)54 8 p.m.(COLUMN)31(COLUMN)61 9 p.m.(COLUMN)32(COLUMN)56 10 p.m.(COLUMN)31(COLUMN)61 11 p.m.(COLUMN)31(COLUMN)64(END TABLE)

Temperatures ending 7 p.m. (EST) yesterday (TABLE) City(COLUMN)L.(COLUMN)H. Albany(COLUMN)04(COLUMN)21 Albuquerque(COLUMN)36(COLUMN)53 Amarillo(COLUMN)20(COLUMN)32 Anchorage(COLUMN)26(COLUMN)30 Asheville(COLUMN)15(COLUMN)41 Atlanta(COLUMN)30(COLUMN)43 Atlantic City(COLUMN)20(COLUMN)35 Austin(COLUMN)57(COLUMN)66 Baltimore(COLUMN)19(COLUMN)38 Billings(COLUMN)-13(COLUMN)-07 Birmingham(COLUMN)40(COLUMN)52 Bismarck(COLUMN)-11(COLUMN)0 Boise(COLUMN)0(COLUMN)17 Boston(COLUMN)20(COLUMN)35 Brownsville(COLUMN)63(COLUMN)77 Buffalo(COLUMN)02(COLUMN)22 Burlington(COLUMN)07(COLUMN)16 Casper(COLUMN)20(COLUMN)-05 Charleston. S.C.(COLUMN)37(COLUMN)53 Charleston, W.V.(COLUMN)17(COLUMN)52 Charlotte(COLUMN)21(COLUMN)42 Cheyenne(COLUMN)-08(COLUMN)-03 Chicago(COLUMN)26(COLUMN)36 Cincinnati(COLUMN)22(COLUMN)48 Cleveland(COLUMN)20(COLUMN)39 Columbia(COLUMN)31(COLUMN)48 Columbus(COLUMN)22(COLUMN)42 Dal.-Ft. Worth(COLUMN)50(COLUMN)57 Dayton(COLUMN)25(COLUMN)47 Denver(COLUMN)07(COLUMN)11 Des Moines(COLUMN)17(COLUMN)34 Detroit(COLUMN)18(COLUMN)30 Duluth(COLUMN)10(COLUMN)27 El Paso(COLUMN)43(COLUMN)59 Fairbanks(COLUMN)00(COLUMN)08 Fargo(COLUMN)-06(COLUMN)02 Flagstaff(COLUMN)30(COLUMN)34 Great Falls(COLUMN)-21(COLUMN)-13 Hartford(COLUMN)10(COLUMN)28 Helena(COLUMN)-26(COLUMN)-12 Honolulu(COLUMN)64(COLUMN)80 Houston(COLUMN)55(COLUMN)66 Indianapolis(COLUMN)29(COLUMN)43 Jackson, Miss.(COLUMN)45(COLUMN)55 Jacksonville(COLUMN)48(COLUMN)53 Juneau(COLUMN)91(COLUMN)24 Kansas City(COLUMN)20(COLUMN)46 Las Vegas(COLUMN)31(COLUMN)55 Little Rock(COLUMN)40*h43 Los Angeles(COLUMN)47(COLUMN)64 Louisville(COLUMN)28(COLUMN)53 Memphis(COLUMN)42(COLUMN)51 Miami Beach(COLUMN)68(COLUMN)75 Midland-Odessa(COLUMN)45(COLUMN)66 Milwaukee(COLUMN)28(COLUMN)33 Mpls.-St. Paul(COLUMN)10(COLUMN)28 Nashville(COLUMN)29(COLUMN)54 New Orleans(COLUMN)53(COLUMN)59 New York(COLUMN)19(COLUMN)34 Norfolk(COLUMN)29(COLUMN)37 North Platte(COLUMN)-05(COLUMN)06 Oklahoma City(COLUMN)24(COLUMN)50 Omaha(COLUMN)08(COLUMN)10 Orlando(COLUMN)61(COLUMN)75 Philadelphia(COLUMN)18(COLUMN)35 Phoenix(COLUMN)51(COLUMN)63 Pittsburgh(COLUMN)15(COLUMN)35 Portland, Maine(COLUMN)13(COLUMN)30 Portland, Ore.(COLUMN)15(COLUMN)29 Providence(COLUMN)15(COLUMN)33 Raleigh(COLUMN)20(COLUMN)47 Rapid City(COLUMN)-41(COLUMN)04 Reno(COLUMN)02(COLUMN)35 Richmond(COLUMN)18(COLUMN)40 St. Louis(COLUMN)37(COLUMN)41 St. Prbg.-Tampa(COLUMN)62(COLUMN)75 Salt Lake City(COLUMN)10(COLUMN)24 San Antonio(COLUMN)57(COLUMN)68 San Diego(COLUMN)56(COLUMN)63 San Francisco(COLUMN)41(COLUMN)49 San Juan(COLUMN)72(COLUMN)83 St. Ste. Marie(COLUMN)13(COLUMN)22 Seattle(COLUMN)19(COLUMN)28 Shreveport(COLUMN)46(COLUMN)55 Sioux Falls(COLUMN)04(COLUMN)06 Spokane(COLUMN)-09(COLUMN)02 Syracuse(COLUMN)-08(COLUMN)20 Topeka(COLUMN)15(COLUMN)47 Tucson(COLUMN)47(COLUMN)60 Tulsa(COLUMN)29(COLUMN)50 Washington(COLUMN)22(COLUMN)38 Wichita(COLUMN)18(COLUMN)32(END TABLE)

Temperatures Abroad Yesterday (TABLE) City(COLUMN)Weather(COLUMN)Low Acapulco(COLUMN)clear(COLUMN)88(COLUMN)68 Barbados(COLUMN)clear(COLUMN)84(COLUMN)75 Bermuda(COLUMN)cloudy(COLUMN)65(COLUMN)61 Bogota(COLUMN)pt. cldy.(COLUMN)68(COLUMN)32 Havana(COLUMN)cloudy(COLUMN)84(COLUMN)72 Kingston(COLUMN)clear(COLUMN)86(COLUMN)73 Montego Bay(COLUMN)clear(COLUMN)84(COLUMN)66 Mexico City(COLUMN)clear(COLUMN)73(COLUMN)46 Monterrey(COLUMN)cloudy(COLUMN)61(COLUMN)55 Nassau(COLUMN)cloudy(COLUMN)82(COLUMN)68 St. Kitts(COLUMN)cloudy(COLUMN)85(COLUMN)73 Vera Cruz(COLUMN)cloudy(COLUMN)81(COLUMN)66(END TABLE)