Three things to know about weather for RVers and travelers Thursday 27 July

  • Severe thunderstorms today capable of damaging winds, tornadoes, large hail, and heavy rain in the Great Lakes.
  • Severe thunderstorms and potential flash flooding this afternoon across New England and along the I-95 corridor to northern Virginia.
  • Summer heat wave builds across the central and eastern U.S. and excessive heat continues in the Southwest.

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Starting Monday morning, 27 November, this site will be down for a major upgrade. 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.


— Portions of north-central and northeast NV: Red Flag (fire danger) Warnings this afternoon and evening. Gusts to 40 mph. I-80, US-93 impacted.

— Southwest CA valleys and mountains, just inland from the coast: Heat Advisories today. High temperatures up to 110 deg F.

Southeast CA Deserts; Colorado River Valley north into southern NV: Excessive Heat Warning through Friday. High temperatures 109-118 deg F. I-8, I-10, I-40 impacted.


Southwest and south-central MT; adjacent east-central ID and extreme northwest WY: Isolated strong to severe thunderstorms possible Friday. Wind and hail are the primary hazards. I-15, I-90 potentially impacted.

— Much of southern ID: Red Flag (fire danger) warnings this afternoon and evening. Gusts 35-45 mph. I-15, I-84 impacted.

— Portions of western and central WY: Strong winds this afternoon and early evening. Gusts 30-40 mph. I-80, US-89 impacted.

— Northeast NV; southeast ID; western and south-central WY: Strong winds Friday afternoon and early evening. Gusts to 35 mph.

East-central and southeast WY; east-central and southeast CO: Isolated strong to severe thunderstorms possible this afternoon and evening. Wind and hail are the primary hazards. I-25, I-70, I-80 potentially impacted.

Much of southern AZ: Excessive Heat Warnings through Friday. High temperatures 109-117 deg F. I-8, I-10, I-17, I-19 impacted.

— AZ Grand Canyon below 4000 feet: Excessive Heat Warning through Sunday. Temperatures may reach 114 deg F at Phantom Ranch.

— Parts of western and central NM: Heat Advisories this afternoon and evening. High temperatures 102-106 deg F.


Eastern MN; central and northern WI: Severe thunderstorms producing, intense rains, wind gusts to hurricane force and large hail are possible this afternoon and evening. I-35, I-39, I-90, I-94 potentially impacted.

Much of IA; southern WI; northern IL: Widely scattered severe thunderstorms Friday. Wind and hail are the primary hazards. I-35, I-39, I-43, I-55, I-57, I-80, I-88, I-90 potentially impacted.

— Central and eastern SD, NE, KS, OK; north-central TX; southern MN; western WI; IA; IL; MO; much of AR; western TN; northwest MS: Excessive Heat Warnings and Heat Advisories through Friday. Heat index values 100-112 deg F.


Southeast ME; central and southern NH and VT; eastern and southeast NY; MA; CT; RI; eastern PA; NJ; much of MD; northern DE; DC; northern VA: Widely scattered severe thunderstorms possible this afternoon. Damaging wind gusts, hail, and risk for a tornado or two will be the primary hazards. I-66, I-70, I-76, I-78, I-80, I-81, I-83, I-84, I-87, I-88, I-89, I-91, I-93, I-95, MA, PA and NJ Turnpikes, NY Thruway, Garden State Parkway potentially impacted.

Southern ME; NH; VT; MA (except Cape Cod); central and northern CT and RI: Flood Watches this afternoon and evening. Heavy thunderstorms may produce rain-rates of 2 inches per hour and up to 3-4 inches of rain in total. I-84, I-89, I-91, I-91, I-93, I-95, Mass Pike potentially impacted.

Central and southern MI; northern IN; northwest OH: Widely scattered severe thunderstorms Friday. Wind and hail are the primary hazards. I-65, I-69, I-75, I-80, I-90, I-94, I-96, OH Turnpike, IN Toll Road potentially impacted.

— IN; OH; western PA; western WV; KY: Heat Advisories today and Friday. Heat Index values 100-105 deg F.

— IN and adjacent southern MI; western OH; northern KY: Heat Advisories through Friday night. Heat index values may reach 109 deg F.

— Southeast ME; southern NH; most of MA; NY Hudson Valley; much of central and eastern PA; NJ; DE; most of MD; DC; eastern VA: Excessive Heat Warnings, Watches and Advisories through Friday. Heat index values will range from the upper 90’s in New England to 110 deg F in MD and VA.

Southeast FL: Flood Watch through this evening. 2-4 inches rain possible in heavy thunderstorms. I-75, I-95 potentially impacted.

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

Severe thunderstorm risk today and tonight.
Wildfire smoke concentrations late this afternoon and evening Thursday 27 July
Severe thunderstorm risk tomorrow and tomorrow night.
Total rainfall amounts for the next three days

Current Severe Thunderstorm and Tornado Watches from the National Weather Service Storm Prediction Center

Tropical weather outlook from the National Hurricane Center

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

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

Some useful links:

High-resolution radar

Your local forecast

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