Jul 10, 2018
A deep, anomalously strong upper level trough and associated surface low dug southward across Western Alaska. As a result, nearly the entire atmosphere across Southern Alaska shifted to southwesterly flow, which brought copious amounts of Pacific moisture into Southern Alaska. This rainfall combined with already high water levels due to snowmelt from anomalously warm temperatures earlier in the month.
Source: NOAA National Weather Service Storm Events Database (event 776285). Narrative written by NWS staff at the time of the event.
This event is one of many recorded floods in Susitna Valley County. See the full FEMA flood zone map, NFIP claim totals, and disaster history for the area.