Santa and the reindeer already left the North Pole.
They have a few stops to make before arriving in the Valley later tonight.
It will be mild and muggy this evening with temperatures in the low 70s by 9 p.m.
Widespread fog will develop after midnight with temperatures near 70 degrees.
Areas of dense fog are likely after 2 a.m.
Visibilities could drop below one half mile or less in some rural areas.
Luckily, Rudolf's bright red nose will help Santa guide his sleigh through the fog.
Around 6 a.m., temperatures will remain mild in the lower Valley and a little cooler in the upper Valley.
The fog will dissipate after 9 a.m.
If you would like to track Santa's trip to the Valley, log on to: http://www.noradsanta.org/