Trip planning weather forecast.

Focus returns to the West. Snow today in the Sierra Nevada. Major storm for central and southern California, the Great Basin and Southwest starting Monday night.
Lake effect snow today for upstate and western New York.
Severe weather threat developing Thursday and Friday for the Southern Plains and Mid-South.

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Pacific:

— Northwest and north-central CA Trinity and Siskiyou Counties above 5000 feet: Winter Weather Advisory continues through this afternoon. 3-8 additional inches of snow likely. I-5 should not be impacted, as the passes are below 5000 feet.

— Northeast CA and the eastern slopes of the Sierra Nevada: Winter Weather Advisories through midday Monday. Snow accumulations generally around 6 inches. US-395 impacted.

— CA Sierra Nevada Mountains: Winter Storm Warnings through midday Monday. Snow accumulations 1-2 feet above 6000 feet. Gusts to 50 mph. I-80, US-50 impacted.

— CA Sierra Nevada Mountains: Winter Storm Watches late Monday through Wednesday morning. An additional 6-24 inches snow possible. Snow levels 3500-4000 feet by Monday morning. I-80, US-50 impacted.

— Central and east-central NV: Flood Watches through Wednesday afternoon. Flooding caused by a combination of rain and snowmelt. US-6, US-50, US-93 impacted.

— Most of southern NV north of I-15: Winter Storm Watches early Tuesday morning through Wednesday afternoon. 5-10 inches of snow, except greater amounts on the higher peaks. Wind gusts to 45 mph. US-6, US-93, US-95 impacted.

— Central and southern CA from the southern Salinas Valley and San Luis Obispo County southward; southwest CA roughly west of a line from Barstow to the Salton Sea: High Wind Watches Tuesday. Gusts 60-70 mph. Major highways impacted include I-5, I-8, I-10, I-15, US-101, CA-1, all greater Los Angeles freeways.

— Central and southern CA coastal regions: Slight risk of flash flooding from heavy rains on Tuesday. Up to 2.5 inches of rain possible. Major highways impacted include I-5, I-8, I-10, I-15, US-101, CA-1, all greater Los Angeles freeways.

Mountain:

— Southeast WY: Strong winds Tuesday. Gusts 50-60 mph. I-25, I-80 impacted.

— North-central and northeast, central and southwest UT: Winter Storm Warnings this evening thorough late Monday night. 8-24 inches snow expected. I-15, I-70, I-80, I-84 impacted.

— East-central UT; central and southwest CO: Winter Weather Advisories Monday afternoon through Tuesday afternoon above 8000 feet. 5-10 inches snow. Wind gusts to 40 mph. I-70 impacted.

— Much of central and western CO and adjacent eastern UT; north-central NM: Winter Storm Watches Tuesday afternoon through Thursday morning, mainly above 8000 feet. Wind gusts to 50 mph. I-70 impacted.

— Southern UT; northern and central AZ: Strong Winds Monday midday and afternoon. Gusts to 45 mph, I-15, I-17, I-40 impacted.

— Southern AZ; most of NM: Strong winds Tuesday. Gusts 35-50 mph. I-10, I-19, I-25, I-40 impacted.

— Central AZ: Slight risk of flash floods Tuesday due to excessive rainfall. Rainfall amounts may total 1-2 inches. I-17, I-40 potentially impacted.

Central:

— Northeast SD: Winter Weather Advisory through this afternoon for blowing snow. Wind gusts to 45 mph. I-29 impacted.

— Central and northern MN; northern WI: Strong Winds through this afternoon. Gusts 30-40 mph. I-35, I-94 impacted.

Eastern:

— Northeast OH; northwest PA; western NY downwind of Lake Erie: Lake Effect Snow Warnings and Winter Weather Advisories for lake effect snow this afternoon through early afternoon. 1-2 inches additional accumulation. I-77, I-79, I-80, I-86, I-90, NY Thruway, OH Turnpike impacted.

— Western NY downwind of Lake Ontario and most of Adirondack Mountains: Lake Effect Snow Warnings (favored snowbelt areas) and Advisories continue through this evening. Additional snow accumulations will range from 4-8 inches. Wind gusts 35-45 mph. I-81, I-87 impacted.

Tornado safety information for RVers (what to do!):

Weather Safety Tips

Access to real-time road information:

Phone numbers and websites for road conditions in all 50 states. Courtesy of the Cheyenne WY Weather Forecast Office

Weather Hazards as of Sunday morning 19 March. Click on graphic for real-time update.
Wind gusts this afternoon 19 March
Likelihood of winter weather impacting RV travel today 19 March
Wind gusts midday Monday 20 March
Likelihood of winter weather impacting RV travel Monday 20 March
Flash Flood risk Tuesday 21 March
Wind gusts Tuesday afternoon 21 March
Likelihood of winter weather impacting RV travel Monday 21 March
Total snowfall accumulation through Tuesday night 21 March
Total precipitation amounts through Tuesday night 21 March