A winter weather warning in U.S. is raising concerns as another round may follow

Rare July snow reached the Dalton

A late July cold front brought an unusual burst of winter weather to Alaska’s Central Brooks Range. The National Weather Service issued a Winter Weather Advisory for Atigun Pass, Anaktuvuk Pass, Galbraith Lake, and Dalton Highway mileposts 232 through 322.

The advisory called for snow, blowing snow, and a light glaze of ice before expiring on July 28. Drivers still needed to check Alaska 511 afterward, but no active statewide road alert was listed at the time of publication.

Atigun Pass turned wintry

The Winter Weather Advisory covered Atigun Pass, Galbraith Lake, Anaktuvuk Pass, and part of the Dalton Highway. Forecasts called for generally around 2 inches of snow, with totals reaching 6 inches at the highest elevations and a light glaze of ice possible on road surfaces.

Forecasts called for temperatures in the 20s around Atigun Pass, along with north winds, blowing snow, and much colder wind chill values. Those conditions were unusual for most U.S. travelers but possible at high elevation in northern Alaska during summer.

Rain followed the brief snow event

The Winter Weather Advisory ended on July 28, and current official information does not indicate any other winter warning or advisory for the Central Brooks Range. AccuWeather reported that no additional snow was expected during the remainder of that week.

A later National Weather Service statement instead forecast one-half to 1 inch of rain through early Tuesday. Future summer snow remains possible at Atigun Pass, but no official forecast currently indicates that another major round is imminent.

Summer snow is possible here

Atigun Pass rises to approximately 4,739 feet, where temperatures can remain much colder than in lower valleys. BLM notes that snow can still fall there in June and July, although fresh summer accumulation may melt quickly once temperatures recover.

Automated sensors can help track snow depth, but no verified reading confirms how much snow remained after this event. NWS cautions that remote data are provisional and may be affected by blowing snow, vegetation, or equipment problems.

Fun fact: Blowing snow, vegetation, and sensor problems can sometimes affect automated snow-depth readings.

Refreezing can create hidden ice

During and immediately after the advisory, melting snow or rain could have refrozen where road temperatures fell below freezing. The risk would have been greatest on elevated, shaded, or exposed sections, but current conditions should be confirmed via Alaska 511 rather than assumed based on an expired weather alert.

Black ice often looks like ordinary wet pavement, especially in dim light. Bridges, shaded curves, and higher sections may freeze first. Drivers should slow down, avoid sudden steering or braking, and treat shiny pavement as potentially icy until road conditions clearly improve.

Atigun Pass tests every vehicle

Atigun Pass is the highest point on the Dalton Highway and sits where the road crosses the Continental Divide through the Brooks Range. Its steep grades, exposed terrain, and fast-changing weather make travel demanding even during summer.

Drivers should slow before descending, maintain extra following distance, and use braking techniques appropriate for their vehicle. Large trucks can throw gravel, mud, or slush and may require considerably more stopping distance.

Fun fact: The Dalton Highway was originally built as a supply road for the Trans-Alaska Pipeline System.

The Dalton is remote by any measure

The Dalton Highway stretches 414 miles from near Livengood to Deadhorse beside the Arctic Ocean. It passes through forests, mountains, tundra, and long sections with few services, making careful planning essential in every season.

Cellphone service is extremely limited, with coverage available mainly around Coldfoot and scattered locations depending on the carrier. A minor breakdown can become a serious delay, especially during cold, wet weather. Travelers should carry food, water, warm layers, a spare tire, basic tools, and enough fuel for the longest service gaps lying ahead.

Coldfoot is a crucial stopping point

Coldfoot is one of the few places along the Dalton Highway offering fuel, food, lodging, and limited repair services. Northbound travelers then face approximately 239 miles before reaching Deadhorse.

A full fuel tank is only the beginning. Tires, brakes, fluids, lights, and windshield wipers should also be checked before climbing toward Atigun Pass. The weather can change faster than help can arrive on this isolated northern Alaska road.

Gravel changes how cars respond

Much of the Dalton Highway remains gravel, which creates problems different from those on a typical paved interstate. Rain can soften the surface, form potholes, reduce traction, and stretch braking distances, while passing trucks may throw loose stones at windshields.

Snow, slush, and rain can hide potholes and ruts while reducing traction on unpaved sections. Drivers should reduce speed before curves, brake gently in a straight line, and avoid following large vehicles closely. A sturdy spare tire is especially important on this rough, demanding route.

Daylight does not guarantee warmth

Northern Alaska receives very long daylight hours in midsummer, but sunlight does not prevent sudden cold weather. Clouds, wind, elevation, and air arriving from the Arctic can push temperatures toward freezing even near the end of July.

That contrast can surprise travelers who packed for ordinary summer conditions. A sunny afternoon may feel mild, while the same road can turn cold, wet, and slippery overnight. Warm waterproof clothing belongs in the vehicle regardless of the date on the calendar.

Forecasts matter mile by mile

Conditions can differ greatly between Coldfoot, Atigun Pass, Galbraith Lake, and the North Slope. A forecast showing rain in one location may still mean snow, sleet, or freezing conditions several thousand feet higher along the same route.

Drivers should check National Weather Service zone forecasts and Alaska 511 reports before leaving. Road cameras, alerts, and message boards can provide valuable clues, but conditions may change between updates. Delaying the crossing or turning back may be safer when visibility or traction deteriorates, provided the driver can do so at a safe location.

Wild weather also affects truck traffic

The Dalton Highway is a working road heavily used by trucks that support North Slope communities and energy operations. These large vehicles need more stopping distance, especially on wet gravel, steep grades, or icy sections near mountain passes.

Passenger vehicles should allow trucks plenty of space and avoid lingering in blind spots. Passenger vehicles should use designated pullouts when allowing commercial traffic to pass and should never stop in a travel lane or on an unsafe shoulder. Courtesy matters on a remote road where changing weather, limited services, and rough surfaces already put every driver under pressure.

For another travel update tied to severe weather, airport delays, and changing flight schedules, see why the FAA issued a warning for 18 major U.S. airports.

Preparation beats a risky rescue

The smartest response to unusual July snow is not panic but preparation. Travelers should review forecasts, check Alaska 511, tell someone their route, and carry supplies for a delay before committing to the Dalton Highway.

Traction equipment, warm clothing, food, water, and emergency communication tools can provide a useful safety margin. Drivers should schedule a stop at  Atigun Pass for the warmer part of the day when possible. If conditions worsen, waiting is safer than pushing forward simply to protect an inflexible timetable.

For another NOAA update tied to space weather, severe storms, and public safety, see why dual warnings are raising concerns across the U.S.

Would July snow make you delay a drive across Alaska’s Dalton Highway? Share your thoughts and drop a comment.

This slideshow was made with AI assistance and human editing.

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