Three things to know about weather for travelers Saturday 22 July

Widespread excessive heat warnings and heat advisories across the South and West throughout the weekend.
Monsoonal thunderstorms over southern Arizona may create hazardous blowing dust conditions.
Expect strong coastal thunderstorms this afternoon and tonight from Louisiana to South Carolina.

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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 Summer Office in Colter Bay Wyoming:

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:

— Much of eastern OR: Heat Advisories through Sunday. High temperatures will range from 95 deg F in the mountain valleys to 106 deg F in the lower valleys.

— Much of interior central and northern CA west of the Sierra Nevada: Heat Advisories through Saturday. High temperatures forecast to be 100-113 deg F.

— Much of northern and central NV: Heat Advisories through Sunday. High temperatures over 100 deg F in the valleys.

— Interior southern and southeast CA; southern NV: Excessive Heat Warnings continue through Sunday. High temperatures 110-121 deg F. High temperatures in Death Valley will reach the mid-120’s deg F daily, while overnight low temperature will struggle to cool down to 100 deg F.

— Wildfire smoke will be thickest today over northwest CA, and southwest and central OR.

Mountain:

— Southwest and southern ID: Heat Advisories through Sunday. High temperatures will range from 105-109 deg F.

— Southeast WY; much of eastern CO; northeast and east-central NM: Marginally severe thunderstorms possible this afternoon and evening. Wind and hail are the primary hazards. I-25, I-40, I-70, I-76, I-80 potentially impacted.

— East-central CO: FLOOD WARNINGS this morning. 2-3 inches of rain from heavy thunderstorms has or will shortly cause creeks, streams and other low-lying regions to flood. I-70 potentially impacted.

— North-central NM: Flood Watch this afternoon and evening. Monsoonal thunderstorms may create excessive runoff, especially over old burn scars. I-25 potentially impacted.

— Western and east-central UT: Excessive Heat Warnings and Advisories Saturday through Monday. Temperatures may reach 103-105 deg F.

— Most of AZ; southwest NM: Excessive Heat Warnings (western and southern AZ) and Heat Advisories through Saturday. Widespread high temperatures at or above 105 deg F. Temperatures in western and southern AZ will reach 110-118 deg F.

— AZ Grand Canyon below 4000 feet: Excessive Heat Warning through Monday. Temperatures may reach 117 deg F at Phantom Ranch.

Central:

— South-central MN; western IA; eastern NE; northeast KS; northwest MO: Widely scattered strong to severe thunderstorms possible Saturday. Wind and hail are the primary hazards. I-29, I-35, I-70, I-80, I-90, I-94 potentially impacted.

— Parts of northwest KS: Flood Watches continue trough this afternoon. Additional flooding is possible. I-70 potentially impacted.

— Parts of western and southwest KS: FLOOD WARNINGS this morning. 2-3 inches of rain from heavy thunderstorms has or will shortly cause creeks, streams and other low-lying regions to flood. I-70 potentially impacted.

— Northeast OK and northwest AR: Severe Thunderstorm Watch this morning. Thunderstorms may contain hail up to quarter-size and wind gusts to 75 mph. I-40, I-44 potentially impacted.

— Central and east-central AR; southwest TN; northern MS; central and northern AL: Severe thunderstorms possible today. Damaging wind is the most likely hazard but some storms may also contain hail. I-20, I-22, I-30, I-40, I-55, I-59, I-65, I-85 potentially impacted.

— LA north of I-10; central and southern MS; central and southern AL; western FL Panhandle: Widely scattered strong to severe thunderstorms possible Saturday. Wind and hail are the primary hazards. I-10, I-12, I-20, I-49, I-55, I-59, I-65, I-85 potentially impacted.

— Central and eastern TX; southern AR; LA; most of MS; central and southern AL; western FL Panhandle: Excessive Heat Warnings (northern LA, central MS, central AL) and Heat Advisories through late this evening. Heat index values and high temperatures generally 105-115 deg F.

Eastern:

— Northern and eastern NY; VT: Flood Watches this afternoon through late tonight. Another round of heavy thunderstorms may produce rain rates greater than 1 inch per hour. I-87, I-88, I-89, I-90, I-91, I-93, NY Thruway potentially impacted.

— Eastern NY; VT; NH; most of MA and CT; eastern PA; NJ; eastern MD; DE; extreme eastern VA: Marginally severe thunderstorms possible today. Wind, hail, and even a brief tornado are possible. I-64, I-76, I-78, I-80, I-87, I-88, I-89, I-91, I-93, I-95, NY Thruway; PA, Mass, and NJ Turnpikes; Garden State Parkway potentially impacted.

— Central and southern GA and adjacent northern FL; southern SC: Widely scattered strong to severe thunderstorms possible today and Saturday. I-10, I-16, I-20, I-26, I-75, I-85, I-95 potentially impacted.

— Central and southern GA; much of FL: Excessive Heat Warnings (southern GA and northern FL) and Advisories today. Heat index values 108-115 deg F. Heat Advisory in southern FL continues through the weekend.

Click here for the extended outlook (updates every Thursday and Sunday evening).

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