In the high glare of a summer evening in Fairbanks, Alaska, Ciara Santiago watched the mercury climb. A meteorologist at the National Weather Service office, she had the dubious honor of issuing the state’s first ever official heat advisory as temperatures were expected to hit the mid-80s.

It’s the kind of bureaucratic alert that rarely makes national headlines. But in a city where permafrost thaw buckles roads, homes lack air conditioning, and the high at this time of year is generally in the low 70s, the warning comes as a sign of rapidly shifting climate. Alaska is warming more than twice as fast as the global average. 

In Alaska, where hazardous cold is historically more of a concern, weather offices in Fairbanks — just 120 miles south of the Arctic circle as the raven flies — didn’t have the option of issuing heat advisories until the beginning of this month, when it was added to a list of possible public alerts. “It gives us a more direct way of communicating these kinds of hazards when they occur,” Santiago said.

The heat bearing down on Alaska isn’t entirely unprecedented, at least in meteorological terms. On the heels of a cold spring, a dome of high pressure, known as an upper-level ridge, has settled over the Interior, a fairly common pattern that traps warm air. In the state’s central valleys, that can spell high temperatures and dry conditions. Temperatures on Friday reached a high of 82 degrees Fahrenheit. An updated advisory on Sunday warned the hot conditions would last until Tuesday, with “temperatures up to 87F to 89F… Isolated areas up to 90F are possible, especially in the Yukon Flats.”

“People in [the] Lower 48 might think that’s nothing, but here those temps could feel like 110,” Santiago said.

With nearly 22 hours of sunlight approaching the solstice, daytime heat accumulates and lingers — not just outside, but indoors. Unlike the Lower 48, most homes in Alaska weren’t built to keep heat out, but to keep it in during months of subzero cold. The thick insulation this requires turns houses into ovens during extended periods of hot temperatures. In Europe, where infrastructure is similarly designed for cold climates, a brutal 2003 heat wave exposed the potential risks: It killed 35,000 people.

That’s part of why the state’s new heat advisory matters. It’s not just a weather bulletin. It’s a warning for a state where most people don’t have the coping mechanisms taken for granted elsewhere — shaded porches, central air, even knowing the signs of heatstroke.

The sudden temperature jump also poses its own challenges. “I’m originally from Texas,” Santiago said. “I’m so used to hot summers that in the 50s, I start putting on a jacket. Now living in Alaska, I’m wearing dresses at that temperature.” But it’s not just a matter of clothing: When your body adapts to higher temperatures, the volume of blood expands, allowing your heart to pump more efficiently and reducing heat stress. You begin sweating earlier, and produce more sweat per gland. But it generally takes one to two weeks of exposure to adapt, making sudden swings in temperature riskier. 

The office Santiago works for, like many National Weather Service offices, have recently lost staff under Trump administration cuts. More than 560 members were laid off across the country, reducing its capacity by about a third, and leaving many stations critically understaffed. As a result, the Fairbanks office that made the state’s first heat warning must now suspend operations overnight. “We’re working to the best of our ability with what we have,” Santiago said. The early start to summer heat comes after a winter with low snow levels and early melt, raising concerns about fire season. Layoffs have also affected firefighting staff, where both technical expertise and basic manpower are in question. Concerned about federal capacity, California Gov. Newsom launched a firefighter recruitment effort this week, but in Alaska, much of the wildland firefighting force is federal, raising the question of whether those like Santiago who must prepare for threats ahead will have the resources they need.