Three things to know about weather for travelers Saturday 18 November

Significant Pacific storm brings rain, high elevation snows and strong winds to California, the Pacific Northwest and the Great Basin.
Storm moves into the Rockies Sunday and Monday with high winds and snow.
Increasing threat of severe weather Sunday and Monday over the Southern Plains and Lower Mississippi Valley, respectively.

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Starting Monday morning, 27 November, this site will be down for a major upgrade. RVWeather.com will return no later than Wednesday 29 November — sooner if possible. When the site returns, WILMA, our NEW(!) integrated weather impacts product, will be available. The Paywall will also be implemented. RV Weather will continue to provide free access to essential, RV-relevant National Weather Service Warnings and Advisories, current weather, and weather safety information. While the main site is off-line, I will post a simple forecast to my email list and to RVWeather on Facebook.

From the RV Weather Winter Office in State College PA:

These are the most significant weather impacts to RV travel over the next two to three days. I do not list every area of rain, showers, or breezy winds. It would be exhausting (for both of us!). Please check out the animations and graphics for a good depiction of the weather along your route.

Pacific:

— WA and OR Cascades: Winter Weather Advisories above 4000 feet. 4-13 inches snow expected. Wind gusts to 40 mph. I-90, US2, US-12, US-20, US-26 impacted.

— Western WA; western OR; northern and central CA: Rain, some heavy, spreads from south to north today and tonight. Rain reaches southwest OR early this afternoon and the WA coast this evening. I-5, I-80, I-84, US-101, CA-1, CA-99 impacted.

— West-central OR Willamette Valley: Dense Fog Advisory through mid-morning. I-5 impacted.

— Portions of north-central and central OR: Dense Fog Advisories through mid-morning. US-26, US-97 impacted.

— Northeast OR: Freezing Fog Advisory through mid-morning. I-84 impacted.

— Central and eastern OR: Strong winds this evening through Sunday morning. Gusts 30-45 mph. I-84, US-20, US-26, US-95, US-97, US-395 impacted.

— Northwest CA Smith River Burn Scar: Flash Flood Watch this afternoon through this evening. Heavy rains may create flash flooding or debris flows over burn scars. US-199 potentially impacted.

— Northern CA Sacramento Valley and Siskiyou Pass; northeast CA: Strong winds today through late this evening. Wind gusts 30-40 mph. I-5, I-80, US-97, US-395 impacted.

— CA Sierra Nevada above 6500 feet. Winter Weather Advisory this afternoon through Sunday afternoon. 3-6 inches of snow likely at pass levels. I-80, US-50 impacted.

— Central and eastern NV; southeast CA: Wind Advisories late tonight through Sunday. Wind gusts 45-60 mph. I-15, I-40, I-80, US-6, US-50, US-93, US-395, CA-58 impacted.

— Central and northeast NV: Snow tonight into Sunday. 1-3 inches likely. I-80, US-50, US-93 impacted. 

— Southern CA Santa Barbara, Ventura County, San Gabriel Mountains, including the I-5 corridor: High Wind Warning tonight, Sunday and Sunday night. Wind gusts 60-70 mph. I-5, CA-14 impacted.

— Southern CA San Bernardino, Riverside, and San Diego County Mountains; Apple and Lucerne Valleys; San Diego County deserts: Wind Advisories tonight through Sunday afternoon. Gusts to 55 mph. I-10, CA-78 impacted.

Mountain:

— Northwest MT Rocky Mountain Front and Glacier NP: Strong Winds develop and continue through early Monday morning. Winds strongest Sunday evening. Gusts 40-55 mph. I-15, US-2, US-89 impacted.

— Much of central ID: Snow starting tonight and continuing thorough early Sunday afternoon. 2-6 inches likely with higher accumulations at higher elevations. US-12, US-93 impacted.

— South-central and southwest ID: Wind Advisories Sunday. Gusts to 50 mph. I-84, I-86 impacted.

— Northwest UT: High Wind Watch Sunday. Wind gusts greater than 60 mph possible. I-80 potentially impacted.

— North-central, central and southwest UT, generally along and east of the I-15 corridor: Winter Storm Watches this evening through Monday morning. Snow accumulations generally 8-14 inches. I-15, I-70, I-80 potentially impacted.

— Much of western and central CO: Snow today in southwest CO, spreading to central and north-central CO by evening. Snow continues over much of the region through midday Monday. Accumulations well in excess of 6 inches at higher elevations. I-70 impacted.

— South-central and southeast AZ: Rain showers, some heavy, this morning. I-8, I-10, I-40, US-60 impacted.

— Much of northern, central and eastern AZ; central and southern NM: Strong winds midday Sunday through Sunday night. Gusts 30-45 mph. I-10, I-25, I-40 impacted.

— Southeast NM and adjacent TX Guadalupe Mountains: High Wind Watch Sunday. Gusts to 70 mph. US-180 potentially impacted.

Central:

— Central and southeast NE; parts of eastern KS: Strong winds Sunday afternoon. Gusts 30-35 mph. I-35, I-70, I-80 impacted.

— Central and south-central NE; north-central KS: Rain, showers and some thunderstorms early Sunday morning through mid-afternoon. Some showers and thunderstorms may be strong. I-70, I-80 impacted.

— Central and eastern OK: Thunderstorms with a threat of isolated hail may develop Sunday. I-35, I-40, I-44 potentially impacted.

— Southwest TX centered around the I-10/I-20 split: Strong winds Sunday. Gusts 35-50 mph. I-10, I-20 impacted.

— Eastern TX; southern MO; most of LA; central and southern MS: Severe thunderstorms possible Monday afternoon into Monday night. Damaging wind and a few tornadoes are expected to be the primary hazards, though isolated hail will also be possible. I-10, I-12, I-20, I-49, I-55, I-59 potentially impacted.

Eastern:

— No significant weather-related impacts to RV travel today or Sunday.

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All the Graphics!