Skies are forecast to be foggy and cool New Year's celebrations tonight, and Sacramento area roads will teem with law enforcement looking for drunken drivers.

The National Weather Service has issued a dense fog advisory due to widespread fog blanketing the Sacramento region. The advisory will remain in effect until noon.

Skies will feature some clouds today with high temperatures about 55 degrees, said Jason Clapp, a weather service meteorologist.

New Year's revelers planning to be outdoors at midnight might want to bundle up against the forecast 41 degree temperature.

Conditions New Year's Day will be similar to today's, but a chance of rain moves in Thursday night. The rain could last into early Friday morning and also bring snow to the mountains, Clapp said.

There are no chain controls in effect for drivers heading up to the Sierra Nevada today, but drivers might see an increased law enforcement presence on area roads.

Law enforcement agencies plan to do saturation patrols in Folsom, Elk Grove, Los Rios and Sacramento, as well as Placer and Yolo counties.

The California Highway Patrol also is placing all available officers on the road to discourage and catch drunken drivers, according to the AVOID program's Web site. AVOID is an anti-DUI program funded through the state Office of Traffic Safety.

Some law enforcement agencies also are holding DUI checkpoints this weekend. Sacramento police will hold a sobriety and drivers license checkpoint Friday night in the south area of the city. Elk Grove police are planning to hold a DUI checkpoint at 8 p.m. Saturday at an undisclosed location in the city.

Tonight, AAA of Northern California is offering free towing for drivers who have imbibed.

The Tipsy Tow program, which is open to everyone, offers a one-way ride home of up to five miles for the driver and their car from 6 p.m. tonight until 6 a.m. Thursday.

Additional passengers may be taken to the driver's home as long as there is enough room in the tow truck, a AAA news release states.

The AAA estimates that a first-time DUI conviction can cost up to $12,000 in fines, penalties, restitution, legal fees and added insurance expenses.

Drivers, potential passengers, party hosts, bartenders and restaurant managers may request the service. Call (800) 222-4357.

There will be several ways to ring in the New Year tonight in the Sacramento region.

A waterfront party with fireworks will be held in Old Sacramento. The festivities begin at 6 p.m. with fireworks at 9 p.m. and midnight.

A ball drop, illuminated sign and video celebrations from around the globe will herald 2009 in downtown Sacramento. The party starts at 11 p.m. at 10th and K streets.

Want to dance in the New Year? There are several parties for dance enthusiasts from Sacramento to Grass Valley. For a listing, go to http://www.sacbee.com/music/story/1497597.html

One city in the Sacramento region, however, won't stop partying Thursday morning. For Roseville, the celebration is just beginning.

The city is celebrating its 100th year in 2009 and is kicking off its centennial celebration Thursday with a float in the 120th Annual Tournament of Roses Parade in Pasadena.

The city's float, titled "Entertaining Dreams for a Century," features a re-creation of a vintage train. Roseville's float is one of nine new entries in this year's Rose Parade and the only entry from Northern California, according information on Roseville's Web site.

The parade begins at 8 a.m. Thursday and is televised on several stations.

Call The Bee's Niesha Lofing, (916) 321-1270