Hail in Powell County, Montana
Hail July 17, 2013 · Powell County, Montana
Where the report was made, with tornadoes recorded within 15 miles over the years.
What the National Weather Service wrote
A very large right-moving supercell brought hail and wind damage to ranchers north of Avon. A rancher reported up to half dollar sized hail that brought considerable damage to their hay crop, and windows.
The wider storm
A mid-level southwest 50 knot jet maximum combined with high moisture and very warm temperatures provided the prime environment for strong supercells. These cells brought both severe wind and hail.
Began near Avon (46.6724, -112.5800).
Source: NOAA Storm Events Database, event 471849. Narratives are written by the National Weather Service forecast office that issued the report.
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