Posted December 19, 2017 9:30 p.m. EST
Updated December 19, 2017 9:33 p.m. EST
A storm system will shift from the Tennessee Valley into the Southeast on Wednesday, bringing periodic rain. While the storm is not expected to be severe, some thunderstorms, heavier downpours and flooding may occur in spots.
Cooler and more seasonable air will return to the Northeast after Tuesday’s milder conditions. It will be mainly dry, with a few snow showers downwind of the Great Lakes.
The dry weather will extend into the Plains, with sunshine and seasonable temperatures. A storm will approach the Front Range from the Rockies, bringing snow from the Sierra Nevada of California and Nevada to Montana and North Dakota.
In the wake of the snow, much colder air will move into the Northwest. While many areas should be dry, snow showers will occur in the Cascades and the higher elevations of Idaho.
The storm system in the Rockies will bring gustier winds through Nevada and into Southern California later in the day. The strengthening winds could worsen fires in the Southwest.
FOCUS: Renewed Risk Of Wildfires In California
Dry, offshore winds are expected to increase once again across Southern California later Wednesday and into Thursday. The combination of the wind and very low humidity may result in rapid wildfire growth. Gusty winds will also cause blowing dust, aggravating the fires.