Three things to know about weather for RVers and travelers Tuesday 20 June

  • Severe flooding possible the next few days from southwest Virginia to upstate South Carolina, including Asheville and Greenville. Do not be caught by quickly rising waters.
  • The tropics are mid-season-active in the Atlantic: Tropical Storm Bret formed yesterday and Cindy may form in the next day or two. Gulf and Southeast Coast RVers should monitor.
  • Strong winds today for Wyoming and the Four-Corners States.

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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 Moose 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.


— North-central NV: FLOOD WARNINGS for portions of the Humbolt River along I-80. Secondary roads immediately off I-80 may be flooded or will shortly flood.

— East-central CA, including Mono County: Flood Advisory through midday Wednesday for enhanced snowmelt. US-6, US-395, CA-120 potentially impacted.

— Much of northern and eastern NV: Freeze Warnings for tonight. Low temperatures around 30 deg.

— Southern CA coast just north of Santa Barbara: Wind Advisory late this afternoon and tonight. Gusts to 45 mph. US-101 impacted.


— West-central ID: Dense Fog Advisory through mid-morning. US-95 impacted.

Southeast MT; north-central and northeast WY: Isolated severe thunderstorms possible this afternoon. Wind and hail are the primary threats. I-90 potentially impacted.

Southeast WY; eastern CO: Isolated to scattered severe thunderstorms possible Wednesday. Large hail and damaging winds are the primary threat, although an isolated tornado cannot be ruled out over southeast WY or northeast CO. I-70, I-76, I-80 potentially impacted.

— Southeast WY; eastern CO: Isolated severe thunderstorms possible Thursday. I-25, I-70, I-76, I-80 potentially impacted.

— Much of UT along and east of I-15; much of southern WY; northwest CO: Strong winds this afternoon. Gusts 30-40 mph. I-15, I-70, I-80 impacted.

— Portions of southern WY: Strong winds Wednesday afternoon. Gusts 25-35 mph. I-80 impacted.

— West-central CO: Red Flag (fire danger) Warnings late this morning through this evening. Wind gusts to 40 mph. I-70 impacted.

— North-central NM along and east of the I-25 corridor: Red Flag (fire danger) Warnings this afternoon and evening. Wind gusts to 40 mph. I-25 impacted.

— Southeast and east-central AZ; much of NM except northwest and southeast portions of the state: Strong winds this afternoon and evening. Wind gusts 30-40 mph. I-10, I-19, I-25, I-40 impacted.


Central ND and central SD: Isolated to scattered severe thunderstorms are possible today. Wind and hail are the primary threats, although a an isolated tornado cannot be ruled out. I-90, I-94 potentially impacted.

— Central and northeast SD; eastern ND and adjacent far-west MN: Strong winds this morning. Gusts 30-40 mph. I-29, I-90, I-94 impacted.

Western NE; western KS; OK Panhandle and southwest OK; eastern TX Panhandle and parts of north-central TX: Isolated to scattered severe thunderstorms possible Wednesday. Wind and hail are the primary threats, although a tornado or two also possible over western NE. I-27, I-35, I-40, I-44, I-70, I-80 potentially impacted.

Much of central and eastern TX and adjacent southern OK: Excessive Heat Warnings through Wednesday evening. Heat index values will reach or exceed 115 deg F. The heat will persist throughout this week. I-10, I-12, I-35, I-37, I-45 impacted.

Southeast LA and southern / coastal MS: Flood Watches through this evening. An additional 2-4 inches of rain are possible. I-10, I-12, I-55, I-59 potentially impacted.

Central and southern LA; southern MS: Isolated to scattered severe thunderstorms possible today. Storms are capable of producing damaging winds, hail and a tornado or two. I-10, I-12, I-20, I-49, I-55, I-59 potentially impacted.

— Central and east-central AL: Dense Fog Advisory this morning. I-20, I-65, I-85 impacted.


Western NC and adjacent southwest VA; far northwestern SC and adjacent northeast GA: FLASH FLOOD WARNINGS, Flood Advisories and Watches in effect through Thursday afternoon. Flooding is already occurring in this region and an additional 5-10 inches of rain may fall in the next three days. If you are camping by any small river, stream, creek, or pond, be very careful regarding rising water levels. Leave low-lying elevations before roads flood and you are cut off. Do not drive or tow through flooded roadways. If you are in a Flash Flood Warning – seek higher ground immediately. I-26, I-40, I-77, I-81 (VA), I-85 potentially impacted.

— DELMARVA Peninsula; central and southern VA: Strong winds Wednesday associated with a summer coastal storm. Wind gusts 25-35 mph, except 30-40 mph at the mouth of the Chesapeake Bay and the southern DELMARVA Peninsula. I-64, I-85, I-95, US-13, Chesapeake Bay Bridge impacted.

Southern GA; FL: Strong to possibly severe thunderstorms today and again on Wednesday. Isolated damaging winds possible. I-4, I-10, I-75, I-95 potentially impacted.

Tropical Storm Bret formed yesterday over the central Atlantic and is moving west. The storm should reach the eastern Caribbean Islands by Thursday, likely at hurricane strength. A lot of questions, as to where Bret goes, and how strong it will be, from there. RV’ers along the Gulf and Southeast Coasts should monitor this system. It is FAR too early to where, or even if, there will be any impacts to the continental U.S. I would not change any travel plans at this time.

There is a second tropical disturbance to the east of Bret that now has a high chance of also developing into a Tropical Storm. If it does, it will be named Cindy. Probably a similar track to Bret, so we’ll watch this system as well.

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

Click on image for interactive version. You can zoom, refresh, and add layers such as Interstate highways or terrain. This works best on a laptop.

New!! Interactive map. Click here to get details on the latest warnings and see the official text.

Flash Flood Risk today and tonight 20 June
Total rainfall amounts for the next three days

All the graphics (and more!) I used to attach to the daily forecast are now accessible with this link.

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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