High Wind — Southern Lewis and Clark, Montana
2021-07-11 · Southern Lewis and Clark, Montana
55 MG
Magnitude
Event narrative
K1GM measures 55 kt (63 mph) non-thunderstorm wind gust (distant outflow boundary).
Wider weather episode
A shortwave moving along the Canadian border interacted with moisture and instability over North-central MT for strong to severe thunderstorm development. Surface based CAPE was generally less than 500 j/kg, but effective shear above 30 kts and DCAPE as high as 2000 j/kg was enough to produce scattered areas of severe wind gusts.
Source: NOAA Storm Events Database, event_id 969867. Narrative written by the NWS forecast office that issued the report.