Hail in Madison County, Montana

Hail July 22, 2021 · Madison County, Montana

0.75 in

Hail diameter

Where the report was made, with tornadoes recorded within 15 miles over the years.

What the National Weather Service wrote

Hail up to 3/4 inch in diameter reported by a trained spotter visiting the area.

The wider storm

An unstable southwesterly flow developed ahead of an approaching Pacific trough and brought strong to severe thunderstorms over a three day period. Surface based CAPE routinely exceeded 1000 j/kg as steep mid-level lapse rates above 8C/km were common. Dry sub-cloud layers helped produce strong thunderstorm wind gusts and effective shear well above 30 kts was enough for quarter size hail and larger. The peak in severe weather occurred on Wednesday July 21st as the main energy associated with the trough moved through the region.

Began near Ennis Big Sky Arpt (45.2898, -111.3996).

Source: NOAA Storm Events Database, event 972553. Narratives are written by the National Weather Service forecast office that issued the report.

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