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High Wind in Southern Lewis and Clark, Montana
High Wind July 11, 2021 · Southern Lewis and Clark, Montana
What the National Weather Service wrote
K1GM measures 55 kt (63 mph) non-thunderstorm wind gust (distant outflow boundary).
The wider storm
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 969867. Narratives are written by the National Weather Service forecast office that issued the report.
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