Stay up to date with all weather conditions affecting transportation in the United States

A slow-moving storm impacting California will produce periods of rain, mountain snow, and gusty winds statewide today, and then move south and remain across southern California through Thursday. Mountain snow will impact travel; and heavy rainfall may cause flooding and debris flows in Southern California. There is an elevated to critical fire weather risk across the Southern High Plains. States with Active Advisories: California.

California - Winter Storm Warning - Sierra. 1-4 inches of additional snow until 11 AM today, with storm totals 3-4 feet. Impacting transit along I-80 through the mountains. 

A slow moving cold front will bring potential for severe storms with large hail, damaging winds, and locally heavy rain across Texas. Farther north in the Plains, wintry conditions will continue. In the Northeast, a meandering coastal low will produce locally heavy rain, with interior snow, gusty winds, and coastal flooding. States with Active Advisories: California, North Dakota, South Dakota, Nebraska, Kansas, Minnesota, Iowa, Wisconsin. 

State breakdown below:

California - Winter Storm Watch - Sierra. 12-18 inches of snow, with local amounts up to 30 inches possible From late tonight through late Sunday night.

North Dakota - Winter Storm Warning - Eastern. Additional inch of snow with winds gusting around 35mph causing blowing and drifting snow until 10 AM CDT this morning.

South Dakota - Winter Weather Advisory - Eastern. Up to 1 inch of additional snow until 7 AM CDT this morning.

Nebraska - Winter Weather Advisory - Eastern. 1 inch of additional snow and 2/10ths inch of ice until 1 PM CDT this afternoon.

Kansas - Winter Weather Advisory - Central. Ice accumulations around 1/10th inch through 10 AM CDT this morning.

Minnesota - Winter Storm Warning - 1-2 inches of additional snow with a glaze of ice until 7 PM CDT Friday.

Iowa - Winter Weather Advisory - Northwest.  Ice accumulations around 1/10th inch Until 4 PM CDT this afternoon.

Wisconsin - Winter Weather Advisory - Western. 1 inch of additional snow and 1/10th inch of ice From 7 AM this morning to 7 PM CDT this evening.

Wintry weather and below normal temperatures will continue from the Northwest mountains to the North/Central Plains. Gusty winds and very dry conditions will create elevated to critical fire weather threats across the South High Plains. A coastal storm meandering in the Atlantic will gradually spread showers, winds, and coastal impacts across New England. States with Active Advisories: Montana, Wyoming, Colorado, North Dakota, South Dakota, Nebraska, Kansas, Minnesota, Iowa. 

State breakdown below:

Montana - Winter Weather Advisory - Southeast. 1-3 inches of additional snow until 6 PM MDT this evening.

Wyoming - Winter Storm Warning - Eastern. 3-6 inches of additional snow until 9 PM MDT Thursday.

Colorado - Winter Weather Advisory - Northwest. 4-8 inches of snow until midnight MDT Thursday night.

North Dakota - Winter Storm Warning - Eastern. 5-8 inches of snow, 1/10th inch of ice, and winds gusting at 35mph until 7 AM CDT Friday.

South Dakota - Winter Storm Warning - 3-5 inches of snow, glazing ice, and winds gusting at 40mph until 1 AM CDT /midnight MDT/ Friday.

Nebraska - Winter Weather Advisory - 1 inch of snow and 2/10ths inch of ice until 7 AM CDT Friday.

Kansas - Winter Weather Advisory - North Central.  1 inch of snow and 2/10ths inch of ice from 1 PM this afternoon to 10 AM CDT Friday.

Minnesota - Winter Storm Warning - Western. 2-5 inches of snow and 1/10th inch of ice from 1 PM Thursday to 7 PM CDT Friday.

Iowa - Winter Weather Advisory - Northwest. 2 inches of snow and 1/10th inch of ice until 7 AM CDT Friday.

A Pacific storm system will spread snow and below normal temperatures into portions of the North/Central Plains. Lighter snow will continue in the Northwest to unseasonably low elevations, while heavier snow will be possible across portions of eastern Wyoming. A wintry mix may develop across the Upper Midwest. Much below normal temperatures can be expected in the Plains mid to late week. States with Active Advisories: Montana, Wyoming, North Dakota, South Dakota, Nebraska, Minnesota

State breakdown below:

Montana - Winter Storm Warning - 3-5 inches of additional snow until noon MDT today.

Wyoming - Winter Weather Advisory - Northeast. 1-3 inches of snow and 1/10th inch of ice from 1 AM Thursday to 7 AM CDT Friday.

North Dakota - Winter Weather Advisory - 3-5 inches of snow and a glaze of ice from 1 AM CDT /midnight MDT/ Thursday to 7 AM CDT /6 AM MDT/ Friday.

South Dakota - Winter Weather Advisory -  1-3 inches of snow and 1/10th inch of ice from 1 AM Thursday to 7 AM CDT Friday.

Nebraska - Winter Weather Advisory -  1-3 inches of snow and 1/10th inch of ice from from 9 PM this evening to 6 AM MDT Friday.

Minnesota - Winter Weather Advisory - Western. Up to 1 inch of snow and 1/10th inch of ice from 7 PM Thursday to 10 AM CDT Friday.

A storm moving through the Southeast will produce severe storms with potential for damaging winds, large hail, and a few tornadoes. Gusty winds ahead of this front will produce elevated fire weather threats in southeastern Florida. A Pacific storm will continue moving inland spreading heavy mountain snow into the Rockies, and a wintry mix into portions of the North/Central Plains. States with Active Advisories: Washington, Oregon, Idaho, Montana, Wyoming

State breakdown below:

Washington - Winter Weather Advisory - Cascades. 2-8 inches of additional snow above 2000ft until 11 AM PDT this morning. Impacting transit along I-90 including through Snoqualmie Pass.

Oregon - Winter Weather Advisory - Cascades/Northeast. 3-7 of additional snow above 2500ft until 11 AM PDT this morning.

Idaho - Winter Weather Advisory - Panhandle. 1-3 inches of valley snow and 3-6 inches of mountain snow until 11 AM PDT this morning. 

Montana - Winter Weather Advisory - Western/Central. 1-3 inches of additional snow in lower elevations and 3-6 inches in the mountains with winds gusting at 35mph from 6 PM this evening to noon MDT Wednesday.

Wyoming - Winter Weather Advisory - Northwest. 6-12 inches of snow and winds gusting at 40mph through 11 PM MDT this evening.

High Winds are present in parts of Oregon, California, Idaho, Nevada, Mississippi, Alabama, Georgia, and Florida. 

Flood Warnings are present along major rivers an territories in the central US.