Aug 21, 2019
On august 21st, an upper level trough over the Pacific Northwest ushered a moist and unstable southwest flow into the region, while much of North-central Montana was situated on the northeast side of a stationary front, where unusually strong easterly surface winds pumped in low level moisture from the plains. Limited cloud cover helped propel mid-level lapse rates to the 8 to 8.5 degree C. As a Pacific cold front associated with the aforementioned trough approached from the west, thunderstorms
Source: NOAA National Weather Service Storm Events Database (event 852515). Narrative written by NWS staff at the time of the event.
This event is one of many recorded floods in Cascade County. See the full FEMA flood zone map, NFIP claim totals, and disaster history for the area.