Hail, Jefferson
- When
- June 20, 3:16 PM MST
- Where
- Jefferson County, 6 mi N of Clancy
- Measured
- 1 in hail
- Reported by
- Trained Spotter
- Coordinates
- 46.557, -111.980
A thunderstorm dropped 1 inch diameter hail at Montana City.
Hail in Montana, June 20, 2010
An unstable airmass contributed to the development of severe thunderstorms over portions of central Montana during the afternoon hours. Hail the size of ping pong balls was reported.
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
The toll
- Deaths
- 0
- Injuries
- 0
- Property damage
- None recorded
- Crop damage
- None recorded
- Events
- 4
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 TFX wrote it up.
An unstable airmass contributed to the development of severe thunderstorms over portions of central Montana during the afternoon hours. Hail the size of ping pong balls was reported.
The radar
The Great Falls radar (KTFX), 110 km away, was scanning. The volume nearest the first event began at 22:16 UTC.
Event by event
4 hail. Local standard time, as filed.
Hail, Lewis and Clark
- When
- June 20, 3:34 PM MST
- Where
- Lewis and Clark County, 5 mi E of East Helena
- Measured
- 1 in hail
- Reported by
- Trained Spotter
- Coordinates
- 46.580, -111.795
A thunderstorm dropped 1 inch diameter hail at East Helena 5E.
Hail, Judith Basin
- When
- June 20, 3:36 PM MST
- Where
- Judith Basin County, 5 mi SW of Stanford
- Measured
- 1.5 in hail
- Reported by
- Trained Spotter
- Coordinates
- 47.099, -110.305
A thunderstorm dropped 1.5 inch diameter hail at Stanford 5SW.
Hail, Judith Basin
- When
- June 20, 3:50 PM MST
- Where
- Judith Basin County, Stanford
- Measured
- 1 in hail
- Reported by
- Park/Forest Service
- Coordinates
- 47.150, -110.230
A thunderstorm dropped 1 inch diameter hail at Stanford.
What these are
- Hail
- Hail three-quarters of an inch or larger, or smaller hail that caused damage, filed with the largest stone measured.
After NWS Directive 10-1605, the rules offices file Storm Data by.
The same day elsewhere
- Heat in Texas, June 20, 2010
- Tornado and Flash Flooding in Montana, June 20 to 21, 2010
- Lightning Strike in Wyoming, June 20, 2010
- Wildfire in Arizona, June 20 to 30, 2010
- Flash Flooding and Flooding in Nebraska, June 20 to 29, 2010
- Hail and Damaging Winds in Massachusetts, June 20, 2010
- Drought in Louisiana, June 20 to 30, 2010
- Tornado and Hail in Nebraska, June 20, 2010
- Tornado and Hail in South Dakota, June 20, 2010
- Hail and Damaging Winds in Texas, June 20, 2010
- Heat in Kentucky, June 20 to 23, 2010
- Heat in Missouri, June 20 to 23, 2010
More
Every storm in Montana in 2010Every state in 2010This day in weather historyWarnings in Montana, June 2010
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 2026-09-24. Each event’s entry at NCEI: 229429, 229430, 229431, 229432.