Thunderstorm Wind — Lewis and Clark, Montana

2024-09-11 · near (hln)helena Rgnl Arp, Lewis and Clark, Montana

Event narrative

Ambient Weather Sensor near East Helena measured a severe gust.

Wider weather episode

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.

View location on OpenStreetMap → (46.6100, -111.9300)

Source: NOAA Storm Events Database, event_id 1211442. Narrative written by the NWS forecast office that issued the report.