Rare midsummer heat advisory grips North Slope Borough

Heat spread across the North Slope Borough on Monday, July 6, as the National Weather Service put the Arctic Plains under a heat advisory and called for afternoon highs near 80 degrees there, while Utqiagvik was expected to warm into the 50s. The warning captured how sharply conditions can change across the borough, from the coast to inland travel corridors, and how quickly a warm spell can become a health issue in places built for cold.

By later guidance, the advisory covered the Arctic Plains from Monday through Wednesday. The forecast also called for isolated thunderstorms in the Brooks Range and Central Arctic Plains, with storm chances extending to the Arctic Coast on Tuesday and Wednesday. That added another layer of risk for anyone traveling, hauling gear, or trying to finish outdoor work before the weather shifted again.

The National Weather Service advised people without air conditioning to find the nearest cooling shelter or stay with family or friends who do have AC. It also urged residents to close curtains during the day, use fans and community buildings with air conditioning, and limit strenuous activity to early morning or evening hours. That advice matters on the North Slope, where most homes do not have air conditioning and where elders, infants, young children, and people with medical conditions can be especially vulnerable to heat-related illness.

For construction crews, subsistence hunters, and anyone working outside, the timing of the heat mattered as much as the temperature. Warm afternoons can strain people faster than they expect, especially when sun exposure lasts through the long daylight hours. The same forecast that brought heat also pointed to thunderstorm development inland, a combination that can cut visibility, change travel plans, and complicate work on roads, trails, and open ground.

The unusual warmth fit a broader pattern that has shown up in recent Alaska climate reporting. NOAA’s Alaska climate report said heat advisories were issued for the North Slope and parts of Alaska’s West Coast in July 2025, and the Alaska Climate Research Center said Utqiagvik posted the highest relative warmth among selected First Order stations in its annual report, with a temperature deviation of nearly 2.7 degrees Fahrenheit. NOAA’s HeatRisk tool, designed to forecast potential heat-related impacts over a 24-hour period, is built for exactly this kind of fast-moving situation.