Heavy Rain in Lemhi County, Idaho
Heavy Rain September 5, 2013 · Lemhi County, Idaho
Where the report was made, with tornadoes recorded within 15 miles over the years.
What the National Weather Service wrote
The Salmon RAWS, located at 5,100 ft. MSL, reported 0.58 of rainfall in one hour. According to radar storm echo trends, the rain could have fallen in less than 30 minutes time.
The wider storm
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 values) on record on the evening of the 5th.
Began near Salmon (45.1490, -113.9450).
Source: NOAA Storm Events Database, event 474054. Narratives are written by the National Weather Service forecast office that issued the report.
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