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High Wind in Southern Lewis and Clark, Montana
High Wind November 5, 2020 · Southern Lewis and Clark, Montana
What the National Weather Service wrote
Mesonet station Iron Ridge (6 SSE Marysville) measured a 55 kt (63 mph) non-thunderstorm wind gust.
The wider storm
Westerly flow aloft began to increase ahead of a broad trough over the Pacific Northwest. H700 winds of 60 to 80 kts were common and a stable layer near the mountain top level created favorable conditions for breaking mountain waves. At the surface, a couple of lee side troughs moved through the Canadian prairies, which provided a tight pressure gradient over the region.
Source: NOAA Storm Events Database, event 923485. Narratives are written by the National Weather Service forecast office that issued the report.
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