Sep 5, 2013
Strong rising air associated with the nose of a 50 knot mid-level south-southwest jet combined with near record high moisture levels and an unstable atmosphere triggered wet multicellular thunderstorms over Lemhi County by late afternoon on September 5th. Flash flooding and power outages were the main impacts. To get an understanding how moist the air mass associated with this southwest surge was, the Boise weather balloon sounding recorded the 2nd highest moisture level (precipitable water valu
Source: NOAA National Weather Service Storm Events Database (event 474232). Narrative written by NWS staff at the time of the event.
This event is one of many recorded floods in Lemhi County. See the full FEMA flood zone map, NFIP claim totals, and disaster history for the area.