Heat in the Southwest. High winds in the Northern Rockies

Southern California, Arizona, and Nevada including I-5, I-10, I-15, I-40. Extreme Heat Warnings and Advisories through the weekend. Temperatures 100–110°F creating dangerous heat exposure for desert travel.
Wyoming and Montana including I-80, I-90, and I-15. High Wind Warnings through tonight with gusts 65–75 mph. Hazardous crosswinds for high-profile vehicles.
Western Washington including I-5 and I-90. Flood Watch and Flood Warning through Friday. Heavy rain and rising rivers may lead to water over roads and travel disruptions.

From the RV Mobile Command Center in Perry GA:

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.

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Weather Impacts Pacific Time Zone:

— Northwest Washington, I-5 and I-90. Flood Watch beginning this afternoon through Friday evening. Heavy rain may lead to flooding and rising rivers.

— Western Washington, I-5 and I-90 near Seattle and Snoqualmie River. Flood Warning through Thursday morning with high water in low-lying areas and possible roadway impacts.

— Southern California, I-5, I-10, I-15, I-8. Extreme Heat Warning through Friday night, expanding into the weekend across desert corridors. Temperatures 96–110°F. Dangerous heat exposure for travelers, especially in inland valleys and desert routes.

— Southern California and Central Coast, including I-5 and I-80 corridors. Heat Advisory through Friday night. Temperatures in the 80s to mid 90s. Elevated heat stress, especially for those without cooling.

— Nevada, and inland California including I-10, I-15, I-40. Extreme Heat Warning and Advisories beginning this afternoon through Sunday night. Temperatures near or above 100°F with major heat risk impacting desert travel.

Weather Impacts Mountain Time Zone:

— Western Montana along I-90. Flood Watch through late evening. Rising streams and creeks may impact travel in mountain valleys.

— Montana I-90 corridor. Wind Advisory through late tonight with gusts up to 65 mph. Difficult travel conditions, especially for RVs and trailers.

— Wyoming (I-80 at Sherman Summit) and Montana (I-15). High Wind Warnings through late evening and tonight. Gusts 65–75 mph creating hazardous crosswinds for high-profile vehicles.

— Wyoming, Colorado, far-western Nebraska & South Dakota corridors including I-25, I-80, I-90, I-76. Red Flag (fire danger) Warnings through this evening and extending into Saturday in some areas. Dry winds and wildfire risk; fire starts could spread rapidly near roadways. Wind gusts 35-40 mph.

— Arizona including I-8, I-10, I-40. Extreme Heat Warning beginning this afternoon through Sunday night. Temperatures near or above 100°F with major heat risk impacting desert travel.

Weather Impacts Central Time Zone:

— Eastern North Dakota (I-29, I-94). Patchy Dense fog reducing visibility through late this morning.

— Northeast Minnesota and northwest Wisconsin along I-35. Light freezing drizzle may create slick roads and slower travel through late this morning.

— Eastern Wisconsin (I-39, I-41, I-43, I-90). Light freezing drizzle or freezing rain may create icy road conditions tonight.

— Parts of Nebraska and South Dakota including I-80, I-90. Red Flag (fire danger) Warning beginning midday today through this evening or into Saturday. Dry winds and wildfire risk affecting roadside conditions. Wind gusts to 35 mph.