During the second and third weeks of June 2025, the North Slope of Alaska experienced significant flooding as a result of rapid snowmelt. The region underwent one of its latest seasonal breakups on record, driven by persistently below-average to record-low temperatures throughout May and into early June, accompanied by continued snowfall through the first week of June.
Every event with a place to put it. Tap one for its entry below.
Deaths and injuries are direct and indirect together, as the offices filed them. Damage is property and crops in the dollars of the year, not adjusted for inflation, and only where an office estimated it.
The episode as NWS AFG wrote it up.
During the second and third weeks of June 2025, the North Slope of Alaska experienced significant flooding as a result of rapid snowmelt. The region underwent one of its latest seasonal breakups on record, driven by persistently below-average to record-low temperatures throughout May and into early June, accompanied by continued snowfall through the first week of June. This prolonged cold period was followed by an abrupt transition to well above-average to record-high temperatures, which triggered rapid snowmelt and flooding between June 12 and 16.
The local office's own words before the first event, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
<!doctype html>
<html lang="en">
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<title>Service Notice</title>
<link rel="stylesheet" href="index.css">
</head>
<body>
<main class="wrap">
<section class="card" role="status" aria-live="polite">
<div class="status" id="status">Temporary Notice</div>
<h1 id="headline">This service is currently unavailable.</h1>
<p id="message1">
The site you requested is temporarily down for maintenance or an unexpected outage.
</p>
<p id="message2">
Please try again in a few minutes.
</p>
<p class="small" id="detail">
If you are an administrator, restore upstream service and remove the redirect/fallback rule when normal operations resume.
</p>
</section>
</main>
<script src="index.js"></script>
</body>
</html>The national radar mosaic for the moment the first event began.
2 flood. Local standard time, as filed.
AKDOT reported water overtopping roads and bridges throughout the area. As meltwater volume increased, major impacts followed including a significant washout at MP 315 on June 14th forced a four-day closure of the highway.
AKDOT reported extensive bank erosion and flooding from the Sag River along multiple stretches of the Dalton highway, with water overtopping roads and bridges throughout the area. As a result the Dalton highway was closed from Milepost 314-355.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Alaska in 2025Every state in 2025This day in weather historyWarnings in Alaska, June 2025
NOAA National Centers for Environmental Information, Storm Events Database, compiled from the National Weather Service’s monthly Storm Data. Complete through 2026-06; NCEI adds each month about 75 days after it ends and revises past years a few times a year. Rebuilt 2026-09-24. Each event’s entry at NCEI: 1280834, 1280843.