Montana, 2022

Flash Flood and Hail in Montana, July 6, 2022

July 6, 2022 · NWS BYZ · 2 events in 1 county or zone

A couple of severe thunderstorms produced some quarter size hail and flash flooding.

Where it happened

Every event with a place to put it. Tap one for its entry below.

  • Tornadoes
  • Tropical storms and surge
  • Floods
  • Wind
  • Hail
  • Winter weather
  • Heat and drought
  • Cold
  • Fire, smoke and dust
  • Marine and coastal
  • Other

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The toll

Deaths
0
Injuries
0
Property damage
None recorded
Crop damage
None recorded
Events
2

Deaths and injuries are direct and indirect together, as the offices filed them. Damage is property and crops in the dollars of the year, not adjusted for inflation, and only where an office estimated it.

What happened

The episode as NWS BYZ wrote it up.

A couple of severe thunderstorms produced some quarter size hail and flash flooding.

The radar

The Billings radar (KBLX), 82 km away, was scanning. The volume nearest the first event began at 01:10 UTC.

Open the radar archive at this moment

Event by event

1 hail, 1 flash flood. Local standard time, as filed.

Hail, Musselshell

When
July 6, 6:13 PM MST
Where
Musselshell County, 7.62 mi N of Roundup Arpt
Measured
1 in hail
Reported by
Public
Coordinates
46.590, -108.540

Flash Flood, Musselshell

When
July 6, 7:30 PM MST to 9:53 PM MST
Where
Musselshell County, 1.2 mi ESE of Roundup Arpt to 2.88 mi N of Roundup Arpt
Cause
Heavy Rain
Reported by
Emergency Manager
Coordinates
46.474, -108.507

Numerous roads around US-87 were closed due to water over the roadway.

What these are

Hail
Hail three-quarters of an inch or larger, or smaller hail that caused damage, filed with the largest stone measured.
Flash Flood
Flooding that begins within six hours of the rain that causes it, or of a dam or levee failure or ice jam release, often with deadly speed.

After NWS Directive 10-1605, the rules offices file Storm Data by.

The same day elsewhere

More

Every storm in Montana in 2022Every state in 2022This day in weather historyWarnings in Montana, July 2022

Sources

NOAA National Centers for Environmental Information, Storm Events Database, compiled from the National Weather Service’s monthly Storm Data. Complete through 2026-06; NCEI adds each month about 75 days after it ends and revises past years a few times a year. Rebuilt 2026-09-30. Each event’s entry at NCEI: 1037164, 1037163.