Flood in Upper Koyukuk Valley, Alaska

Flood August 3, 2019 – August 4, 2019 · Upper Koyukuk Valley, Alaska

Where the report was made, with tornadoes recorded within 15 miles over the years.

What the National Weather Service wrote

The Alaska DOT estimated that a three day storm peaked with around 4 inches of rain in 24 hours ending on Aug 3rd in the vicinity of the Jim River between Dalton Highway Mileposts 142 to 145. Water overtopped the Highway at two locations between Jim River #3 and Douglas Cr. Water was estimated to be around 2 feet deep across the highway. The road was impassable to some vehicles. The flowing water also caused damage to the Highway.

The wider storm

A series of weather fronts associated with an an atmospheric river moved into the Bering Sea and across Interior Alaska during the first week of August. Heavy rainfall resulted in flooding of the Dalton Highway near the Jim River from Milepost 142 to 145.

Began near Bettles Field (66.8385, -150.6089).

Source: NOAA Storm Events Database, event 854520. Narratives are written by the National Weather Service forecast office that issued the report.

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