Status as of Oct. 24, 2026: We reviewed National Weather Service (NWS) coverage for Wyoming, Colorado and Nevada and found no confirmed active snow squall warning or winter storm warning in any of the three states. Several squall stories still ranking in search results are from past events, including one-day Colorado warnings and a Fremont County, Wyo., alert. They are not current.
Alerts in this region can be issued, and can expire, in under an hour. Before you drive, check the live map at alerts.weather.gov or go straight to the issuing NWS office:
- Wyoming: NWS Cheyenne (southeast Wyoming, including I-80 from Cheyenne to Rawlins) and NWS Riverton (central and western Wyoming, including WY-28 over South Pass)
- Colorado: NWS Boulder (Denver, the Front Range and I-25 north), NWS Pueblo (southern I-25) and NWS Grand Junction (the western slope and much of I-70 west of the Divide)
- Nevada: NWS Elko (northeast Nevada and I-80) and NWS Reno (western Nevada and the Sierra)
Why it matters even with nothing active right now: late October is when the first squalls of the season usually reach the high plains and passes. Drivers are still on summer habits and often on worn all-season tires. A squall can cut visibility from miles to near zero within seconds, and that is how pileups start.
What a snow squall is and why the warning exists
A snow squall is an intense, short-lived burst of heavy snow driven by strong, gusty wind. It usually lasts under an hour and often only 15 to 30 minutes at any one spot. Total snowfall is often small, sometimes under an inch. The danger comes from the sudden whiteout and the flash freeze on road surfaces that were dry moments earlier.
Winter storm products were never built for that. A winter storm warning covers a long, widespread event measured in hours or days. A squall is a moving band a few miles wide. NWS introduced the snow squall warning in 2018 to fill the gap, and Colorado offices began issuing them in the 2019–20 season. The warning is drawn as a polygon around the squall’s path, much like a tornado or severe thunderstorm warning, rather than covering whole counties.
In Wyoming and Colorado, squalls typically form along a sharp arctic cold front or under a cold upper-level low. Past Wyoming events have moved east at about 50 mph. At that speed a squall can sweep a 40-mile stretch of I-80 in under an hour.
Timeline: how a squall alert typically unfolds
No event was active when we checked, so this is the usual sequence. Use it to read an alert when one is issued:
- 12 to 48 hours out: The NWS area forecast discussion flags a strong cold front and mentions squall potential. A winter storm watch may be issued if heavier, longer-lasting snow is also expected.
- A few hours out: Hazardous weather outlooks and social posts from NWS Cheyenne, Riverton or Boulder call out the timing window for specific corridors.
- 0 to 60 minutes out: Once radar and surface observations show the squall forming, the office issues the snow squall warning. It usually runs 30 to 60 minutes and covers the projected path.
- During the event: The warning may be updated as the squall moves and handed off to the next office downstream, for example from Riverton to Cheyenne.
- Expiration: Skies can clear quickly, but roads often stay glazed. Black ice behind a squall is a common secondary hazard.
We will update this section with time-stamped entries the next time an alert is issued for the region.
Who is affected: highways and travelers most at risk
The corridors that see the worst squall impacts
- I-80 across southern Wyoming: The Elk Mountain and Arlington stretch between Laramie and Rawlins combines high elevation, open terrain and strong crosswinds. WYDOT closes it more often than almost any other interstate segment in the country. Its variable speed limit signs can drop sharply in minutes.
- I-25 from Cheyenne through Denver to Colorado Springs: Heavy commuter traffic and a lot of semis mean a short whiteout can cause a large chain-reaction crash.
- I-70 mountain corridor: The Eisenhower-Johnson Memorial Tunnel approaches, Vail Pass and Floyd Hill all see squall-driven closures, especially on ski weekends.
- US-287 and WY-28 (South Pass): These are rural two-lane roads with long gaps between services.
- I-80 in northeast Nevada: The stretches around Elko and Wells get the same cold-front squalls that later cross Wyoming.
Who should pay closest attention
That includes long-haul truckers, ski-resort traffic, school buses on rural routes and anyone flying through Denver International or Salt Lake City. Airport de-icing and ground stops can follow a squall even when the band itself passes in minutes.
Florida note: If you’re flying to Colorado ski country this winter or driving a cross-country snowbird route on I-80 or I-70, you are the driver most likely to get caught off guard. Most Florida drivers have never handled a whiteout. Rental cars in Denver often come with all-season tires. Colorado’s Traction Law requires at least 3/16-inch tread and M+S or winter tires, or 4WD/AWD, when it is in effect on I-70. Fines start above $130 and climb past $650 if your car blocks the road. Ask the rental counter what tires you’re getting before you leave the lot.
Snow squall warning vs. winter storm warning vs. advisory
This is the most common point of confusion, so here they are side by side:
| Alert | Typical duration | Trigger | Main hazard | What to do |
|---|---|---|---|---|
| Snow squall warning | 30–60 minutes | Sudden heavy snow plus gusty wind causing whiteout and rapid icing | Near-zero visibility, flash freeze, pileups | Delay travel or exit the highway before the squall arrives |
| Winter storm warning | 12 hours to several days | Heavy snow, sleet or ice meeting local criteria (higher in the mountains than on the plains) | Accumulating snow, closures, power outages | Avoid travel; if you must go, carry a winter kit |
| Winter weather advisory | Several hours or longer | Lighter snow or ice below warning criteria | Slick roads, slower commutes | Allow extra time and use caution |
| Winter storm watch | Issued 12–48 hours ahead | Warning-level conditions are possible | Planning stage | Adjust travel plans and prepare |
Nevada and Wyoming winter storm warnings
Nevada and Wyoming often share the same storm. A Pacific system brings heavy snow to the Sierra and northern Nevada first, then crosses Utah and reaches western Wyoming a day or so later. If NWS Reno or Elko issues a winter storm warning, expect Riverton and Cheyenne to start messaging soon after. As of Oct. 24, 2026, we found no confirmed winter storm warning in either state. Check the NWS offices listed above for current products.
Official response: who issues what, and how alerts reach you
The NWS issues the warnings. State transportation departments decide what happens on the roads:
- WYDOT posts closures, variable speed limits and “no unnecessary travel” advisories at wyoroad.info and by calling 511.
- CDOT posts Traction Law and Chain Law activations, metering and closures at cotrip.org and by calling 511.
- NDOT posts chain controls and closures at nvroads.com and by calling 511.
Snow squall warnings trigger Wireless Emergency Alerts. If your phone is in the warning polygon, you get the same loud alert tone used for tornado warnings, with no app required. Make sure emergency alerts are switched on in your phone’s notification settings.
Reading the NWS map: On alerts.weather.gov or your local office’s page, squall warnings appear as small, narrow polygons, and winter storm products shade whole forecast zones. A thin polygon sitting across an interstate ahead of you means trouble arriving within the hour.
What to do if you’re caught in a snow squall
- Don’t drive into one. If a warning is out for your route, wait it out at an exit, gas station or rest area. Most squalls pass within an hour.
- If visibility drops, slow down gradually. Hard braking on a flash-frozen road is how chain-reaction crashes start.
- Turn on your headlights (not just daytime running lights) and your hazard lights, and leave far more following distance than feels normal.
- Never stop in a travel lane. If you can’t see, take the next exit or pull as far off the road as you safely can.
- Once stopped off the road, stay buckled in and take your foot off the brake. Glowing brake lights can draw following drivers toward you.
- Keep a basic kit in the car: a blanket, water, a phone charger, an ice scraper and a full tank. Wyoming closures can leave you waiting for hours.
What happens next
The season’s first organized cold fronts usually arrive in late October and November, so expect squall messaging to pick up from here. For a 24- to 72-hour outlook, read the area forecast discussion from NWS Cheyenne, Riverton, Boulder or Grand Junction. It is the plainest early signal of squall risk, often a full day before any warning.
For live updates, keep three tabs open before any mountain or high-plains drive: alerts.weather.gov, the 511 site for each state on your route, and your airline’s travel advisory page if you’re flying. We will update this page with a time-stamped entry the next time NWS issues a snow squall or winter storm warning for Wyoming, Colorado or Nevada.
FAQs
What is a snow squall warning?
It is a short-fused National Weather Service alert for an intense burst of heavy snow and gusty wind that causes sudden whiteouts and icy roads. It usually lasts 30 to 60 minutes and covers a narrow path, not whole counties.
Is there a snow squall warning in Wyoming or Colorado today?
As of Oct. 24, 2026, we found no confirmed active snow squall warning for Wyoming or Colorado. These warnings are issued and expire quickly, so check alerts.weather.gov or NWS Cheyenne, Riverton, Boulder, Pueblo or Grand Junction for live status.
Are there winter storm warnings in Nevada and Wyoming?
We found no confirmed winter storm warning for Nevada or Wyoming as of Oct. 24, 2026. Storms often hit northern Nevada first and reach Wyoming a day later, so watch NWS Reno and Elko for an early signal.
How long do snow squalls last?
Usually under an hour, and often only 15 to 30 minutes at one location. The roads can stay icy well after the snow stops.
How do I get snow squall alerts on my phone?
Snow squall warnings are sent as Wireless Emergency Alerts. Your phone receives them automatically inside the warning area as long as emergency alerts are enabled in your notification settings.
What should I do if I get caught in a snow squall while driving?
Slow down gradually, turn on headlights and hazard lights, and increase following distance. Never stop in a travel lane. Exit or pull well off the road, stay buckled in and keep your foot off the brake.
