Flood in Copper River Basin, Alaska

Flood May 13, 2023 – May 18, 2023 · Copper River Basin, Alaska

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

What the National Weather Service wrote

Snowmelt flooding pushed Moose Creek into flood across Glennallen, AK. The flood inundated the town of Glennallen, flooding homes, businesses and Glenn Highway at MP 185, forcing it to close. Flooding was extensive and a disaster declaration was declared for Glennallen on May 13, 2023 for the severe flooding.

The wider storm

An unusually cold spring kept snowpack intact and in place over the Copper River Basin into mid May. Once temperatures started to warm, they did so quickly and rapidly melted snowpack in the basin. An additional snow event later in May repeated the process creating multiple events where snowmelt would impact Glennallen and Old Edgerton Highway from Moose Creek snowmelt, and Gulkana and Sourdough areas along the Gulkana River.

Began near Glennallen (62.1089, -145.5527).

Source: NOAA Storm Events Database, event 1104522. Narratives are written by the National Weather Service forecast office that issued the report.

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