If you are planning to get a jump start on your holiday celebrations by traveling this weekend to avoid the rush of 98.6 million people forecast to travel this holiday season, you may run into some trouble from a storm systems crossing the Southeast and West.

Here is our latest forecast thinking day-by-day through the weekend.

Saturday's Forecast

(Forecast information updates once an hour.)

Saturday

A few showers or thunderstorms may dot parts of the Southeast and northern Gulf Coast. We can't rule out flurries or freezing drizzle in a few spots of the Appalachians and adjacent piedmont of Virginia and western North Carolina.

Heavy, wind-driven rain and mountain snow will pummel the Pacific Northwest and far northwest California. Flash flooding, mud/rockslides may occur in western Washington and western Oregon.

(DETAILS: Northwest Weekend Flood Threat)

Sunday's Forecast

(Forecast information updates once an hour.)

Sunday

Showers and perhaps a rumble of thunder will linger in the Southeast and along parts of the Gulf Coast, including Florida.

Some light snow or flurries are possible in the Upper Midwest and western Great Lakes.

Mountain snow will continue in the Cascades and spread to the northern and central Rockies. Yet more low-elevation rain will continue in western Washington and western Oregon. Flash flooding may worsen and mud/rockslides may become more numerous in the Pacific Northwest.

There appears to be a higher-impact storm (or two) in the cards closer to Christmas itself.

(MORE: Christmas Week Forecast)

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Jim Ridley uses a flashlight to get his mail Thursday, Dec. 26, 2013, in Litchfield, Maine, where he has been without electricity since Monday's ice storm. (AP Photo/Robert F. Bukaty)