Aug 10, 2022
The set up was a broad longwave trough in place over much of the Bering Sea through southern Alaska. Embedded in this broad longwave trough was an upper level low meandering over the Yukon-Kuskokwim Delta. Multiple upper level shortwaves rotated around this upper level low along with a jet stream aimed right up Cook Inlet into Southcentral. The southwesterly flow at 700 millibars was also very moist with all this moisture being advected northeastward into the Cook Inlet region and Mat-SU Valleys
Source: NOAA National Weather Service Storm Events Database (event 1050701). Narrative written by NWS staff at the time of the event.
This event is one of many recorded floods in Matanuska Valley County. See the full FEMA flood zone map, NFIP claim totals, and disaster history for the area.