Flooding Rain, Sierra Snow and High Winds Impact Travel

Flood Watches: Moderate to heavy rain from an Atmospheric River Event may lead to rising rivers and flooding of low-lying areas across the Sacramento Valley, Delta Region and Sierra Nevada foothills this evening through Monday afternoon.
Winter Storm Warnings: Heavy snow and strong winds may create dangerous mountain travel conditions across the California Sierra Nevada and parts of north-central California from this afternoon through Monday afternoon.
High Wind Warnings and Advisories: Strong to damaging winds may cause hazardous driving and possible road restrictions across portions of Wyoming, Montana, the Pacific Northwest, coastal Oregon and northern California from today through Sunday afternoon.

From the RV Weather Field Office in State College PA:

Here are the relevant National Weather Service Warnings, Watches and Advisories that will impact RV and Road travel over the next several days.

Scroll down to the always-updating graphics immediately below this forecast for the latest information and for weather impacts that do not meet NWS Alert criteria.

RV Weather’s free Weather Hub has a complete collection of always updating forecasts.

Note: The daily written forecast will transition to a weekly RV Weather Outlook beginning in January 2026. Continuously updated (free) graphics will continue. The final daily forecast will be issued tomorrow morning, 4 January 2026.

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Weather Impacts Pacific Time Zone:

— Much of the WA Coast and northern Puget Sound: Coastal Flood Warnings and Watches mid-morning through early this afternoon, and again Sunday morning through Sunday afternoon. Significant coastal flooding due to high tides and storm surge is expected. Inundation of 2-3 feet above ground level is possible along shorelines and low-lying coastal areas. Numerous roads may be closed. Low lying property including homes, businesses, and some critical infrastructure may be inundated. US-101 potentially impacted.

— Portions of central and north-central WA: Winter Weather Advisory this morning. Mixed precipitation. Additional snow accumulations up to 2 inches. Total ice accumulations up to one tenth of an inch. US-2, US-97 impacted.

— Northeast WA and northern ID, all north of I-90: Winter Weather Advisory this morning. Mixed precipitation expected. Total snow accumulations up to one inch and ice accumulations around a light glaze. US-2, US-95, US-395 impacted.

— Southeast WA; portions of north-central and northeast OR: Dense Fog Advisories this morning. I-84, US-12, US-20, US-26, US-97 impacted.

— Northeast OR Blue Mountain Foothills: Wind Advisory through early this afternoon. Wind gusts to 55 mph. I-84, US-395 impacted.

— A portion of south-central OR including Crater Lake National Park: Winter Weather Advisory this afternoon through Sunday afternoon. Snow expected above 5000 feet. Total snow accumulations of 5 to 10 inches. Winds gusting as high as 45 mph over high and exposed terrain. OR 58, OR 62, OR 138 impacted.

— Southwest OR Rogue Valley (near Medford): Wind Advisory continues through late this evening. Wind gusts 45-55 mph. I-5 impacted.

— South-central OR; northeast CA: Wind Advisories this morning through early Sunday morning. Wind gusts to 50 mph. US-97, US-395, CA-139 impacted.

— Southwest OR coast and northwest CA coast: High Wind Warnings and Advisories this morning through early Sunday morning. Wind gusts 55-70 mph. Strongest winds around Cape Mendocino. US-101, US-199 impacted.

— Southwest OR and northern CA coastal regions; Sacramento and northern San Joaquin Valleys: A few marginally severe thunderstorms are possible today. A brief tornado or two and/or damaging wind gusts are the primary hazards. I-5, I-80, US-101, CA-99 potentially impacted.

— Northern CA I-5 Corridor Shasta Valley: High Wind Warnings and Advisories continue into early Sunday morning. Wind gusts 55 mph early this morning, increasing to 65 mph by late this morning. I-5 impacted.

— Northern CA coast from the OR border south to and including the San Francisco Bay Area: Coastal Flood Warnings and Watches through Sunday afternoon. High astronomical tides and large surf may cause moderate to major flooding in low lying areas. 1-3 of saltwater inundation above ground level is possible in low lying areas near shorelines and tidal waterways. Several coastal roads may be closed. Low lying property and some critical infrastructure will be inundated. US-101 potentially impacted.

— Parts of north-central CA: Winter Storm Warning above 5000 feet this afternoon through Monday afternoon. Heavy snow expected. Total snow accumulations of 6 to 18 inches, with 24 to 36 inches for the highest peaks and ridgelines. Winds gusting as high as 60 mph over high and exposed terrain. US-97, CA-3, CA-89, CA-96 impacted.

— Northwest CA: Flood Watch continues through Sunday evening. Widespread moderate to heavy rain from two consecutive strong weather systems will produce 2-4 inches of rainfall from tonight through late Sunday. Locally up to 7 inches is expected over the southwest windward-facing terrain. US-101, CA-1 impacted.

— Western CA, along and west of the coastal ranges, from the OR border south to Santa Barbara: Wind Advisories continue through this evening. Wind gusts to 50 mph. Strongest winds along the northwest CA coast. US-101, US-199, CA-1, CA-17, CA-128 impacted.

— Northeast CA: Winter Weather Advisory AND Flood Watch through Monday afternoon. Periods of moderate to heavy rain may fall this weekend over a decent snowpack from the Christmas storm system. Rain/snow elevations will be initially around 6500 to 7000 feet today, increasing runoff as the snow melts. Flows in rivers may increase quickly and approach flood levels. Rain/snow elevations are forecast to drop below 6000 feet Sunday into Monday. Snow mainly above 5000 feet. Snow accumulations of 4 to 8 inches with locally up to 12 inches above 5000 feet west of US-395, and 1 to 4 inches above 5000 feet along and east of US-395. Winds gusting as high as 45 mph. US-395, CA-36, CA-44, CA-70, CA-139 impacted.

— Northern and central CA Sacramento Valley, Delta Region and Sierra Nevada foothills below 4000 feet: Flood Watches this evening through Monday afternoon. An Atmospheric River Event will bring moderate to heavy rain this evening through Monday evening. 1-2 inches of rainfall in the valleys and up to 6 inches of rain in the foothills. Major highways potentially impacted include I-5, I-80, US-50, CA-49, CA-99, CA-168, CA180.

— Northern CA Sacramento Valley: Wind Advisory tonight. Wind gusts 35-45 mph. I-5, CA-32, CA-36, CA-99, CA-149 impacted.

—CA Sierra Nevada Mountains: Winter Storm Warnings continue through Monday afternoon. Heavy snow expected above 5000 feet. Total snow accumulations of 1 to 2 feet above 5000 feet, with 2 to 5 feet above 6000 feet. Winds gusting as high as 55 mph. Snow levels lowering to 5000 to 6000 feet this afternoon into Sunday, and further to around 4500 to 5500 feet by early Monday morning. Heaviest snow expected on Sunday. I-80, US-50 impacted.

— CA eastern slopes Sierra Nevada Mountains: Winter Storm Warning continues through Monday morning. Heavy snow. Snow accumulations of 1 to 3 feet above 8000 feet with up to 4 feet locally on highest peaks. Snow accumulations of 2 to 6 inches for communities along US-395 with 8 to 16 inches between 7000 and 8000 feet. Wind gusts of 35 to 45 mph with ridge-top winds gusting over 100 mph at times. US-6, US-395 impacted.

— Central CA San Luis Obispo County: Flood Advisory this morning. Moderate to heavy rain falling over Western San Luis Obispo County this morning. Rainfall rates between 0.25 and 0.45 inch per hour have been observed with this band of rain. Minor flooding is ongoing or expected to begin shortly in the advisory area. US-101, CA-1 impacted.

Weather Impacts Mountain Time Zone:

— Southwest ID Lower Treasure Valley: Dense Fog Advisory early this morning. I-84 impacted.

— Northwest MT: Winter Weather Advisory continues this morning. Mixed precipitation expected. Total snow accumulations up to one inch and ice accumulations around a light glaze. US-2. US-89, US-93 impacted.

— Northwest, central and south-central MT; northwest, central, east-central, south-central and southeast WY; central CO: Strong winds Sunday. Wind gusts 35-55 mph. I-15, I-25, I-70, I-80, I-90, US-2, US-12, US-18, US-20, US-26, US-30, US-40, US-50, US-85, US-87, US-89 impacted.

— Northeast MT: Dense Fog Advisory through late this morning. US-2 impacted.

— Much of western WY north of US-30: Winter Weather Advisories tonight through midday Monday. Snow expected. Total snow accumulations between 8 and 16 inches. Locally higher amounts up to 2 feet in the Tetons. Winds gusting as high as 40 mph tonight into Sunday morning. Snow levels generally 6500-7000 feet. US-14, US-16, US-20, US-26, US-89, US-189, US-212 impacted.

— Much of southeast and east-central WY: High Wind Warnings tonight through Sunday afternoon. Wind gusts 55-70 mph. I-25, I-80, US-18, US-20, US-26, US-85, US-287 impacted.

— A portion of southeast ID and adjacent north-central UT: Dense Fog Advisory this morning. I-15, US-91 impacted.

— North-central UT: Winter Weather Advisories tonight through Monday night. Snow expected. Total snow accumulation between 8 to 18 inches expected, mainly above 7500 feet. Locally higher snow accumulation to 2 feet expected for locations above 8500 feet across the Wasatch and Bear River Range. I-80, US-6, US-89, US-91 impacted.

— Portions of west-central and southwest CO: Dense Fog Advisories this morning. I-70, US-50, US-160, US-550 impacted.

— A portion of northwest AZ: Dense Fog Advisory this morning. I-40, US-93 impacted.

Weather Impacts Central Time Zone:

— Central and southern SD; northern and central NE: Strong winds develop on Sunday. Wind gusts to 40 mph except gusts to 50 mph south of Rapid City. I-29, I-90, US-18, US-20, US-26, US-81, US-83, US-85, US-385 impacted.

— Parts of west-central KS: Dense Fog Advisories this morning. I-70, US-36, US-50, US-54, US-56, US-83, US-283 impacted.

— Southern AL; FL Panhandle: Isolated severe thunderstorms are possible today. Strong storms most likely between Mobile and Tallahassee. I-10, I-65, I-85 potentially impacted.

Weather Impacts Eastern Time Zone:

— Central NY downwind of Lake Ontario, east of Oswego and north of Syracuse: Winter Storm Warning continues through this evening. Heavy lake effect snow. Additional snow accumulations 8 to 12 inches in the most persistent bands. I-81 impacted.

— Western and northern ME: Cold Weather Advisory this morning. Wind chill values as low as -30°F.

— Central and southern GA; southeast SC; northern FL: Isolated severe thunderstorms are possible today. Strong storms most likely between Mobile and Tallahassee. I-10, I-16, I-75, I-95 potentially impacted.

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Looking for real-time road conditions? Here’s a link, courtesy of the Federal Highway Administration, to all the individual State 511 websites.