Jun 13, 2022
A persistent upper trough pushed several shortwave troughs supported by a moderate plume of moisture in the middle of June. Persistent rain showers that develop as a result of each shortwave trough produced enough rainfall for area rivers to swell, with minor flooding being observed along portions of Mill Creek.
Source: NOAA National Weather Service Storm Events Database (event 1043216). Narrative written by NWS staff at the time of the event.
This event is one of many recorded floods in Walla Walla County. See the full FEMA flood zone map, NFIP claim totals, and disaster history for the area.