Flash Flood in Lemhi County, Idaho
Flash Flood 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
Very wet thunderstorms triggered flash flooding in the Kriley Creek drainage. This debris flow traveled over the northbound lane of highway 93 shutting it down for a period. The BLM road Kriley Gulch Rd was closed in the Kriley Creek drainage due to another separate washout.
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 North Fork (45.3547, -113.9245).
Source: NOAA Storm Events Database, event 474232. Narratives are written by the National Weather Service forecast office that issued the report.
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