Thunderstorm Wind in Lewis and Clark County, Montana

Thunderstorm Wind September 11, 2024 · Lewis and Clark County, Montana

63 mph

Measured gust (55 kt)

Where the report was made, with tornadoes recorded within 15 miles over the years.

What the National Weather Service wrote

Ambient Weather Sensor near East Helena measured a severe gust.

The wider storm

An upper level trough passed across the Northern Rockies September 11, which allowed for numerous thunderstorms to develop in the afternoon. Thermodynamic and kinematic ingredients were sufficient for a few strong thunderstorms, mostly across Southwest Montana. Additionally, a series of thunderstorms moved across the Horse Gulch burn scar, which resulted in flash flooding.

Began near (hln)helena Rgnl Arp (46.6100, -111.9300).

Source: NOAA Storm Events Database, event 1211442. Narratives are written by the National Weather Service forecast office that issued the report.

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