Flash Flood — Lemhi, Idaho

2013-09-05 · near Shoup, Lemhi, Idaho

$1K

Property damage

Event narrative

A washout near Cramer Creek closed Salmon River Road/NF - 30 for a time. Nearby weather stations in Lemhi county reported anywhere from 0.39 up to 0.58 in less than 30 minutes with these storms.

Wider weather episode

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.

View location on OpenStreetMap → (45.3090, -114.6260)

Source: NOAA Storm Events Database, event_id 474229. Narrative written by the NWS forecast office that issued the report.