Flood — Susitna Valley, Alaska

2022-07-19 to 2022-07-21 · near Willow, Susitna Valley, Alaska

Event narrative

Hydrographs ands tabular data for Willow Creek showed action stage was exceeded by

July 19 at 4pm, minor flood stage was exceeded by July 19 at 9pm, crest occurred on July 20 at 5am.

Other creeks in 145 that exceeded action stage: Little Susitna River, Willow Creek near Willow, Susitna River at Gold Creek & Parks Hwy Bridge, Talkeetna River near Railroad Bridge.

Wider weather episode

After the two months of dry and sunny weather due to mostly upper level ridging in place across much of Alaska, the pattern flipped for the second half of the month to more of an upper level trough as the upper level ridge shifted to the east. This resulted in multiple storm systems moving into Southcentral with rounds of heavy rainfall that resulted in small streams and river rises in the area.

View location on OpenStreetMap → (61.7676, -150.0681)

Source: NOAA Storm Events Database, event_id 1048251. Narrative written by the NWS forecast office that issued the report.