Hail, Stillwater
- When
- August 13, 3:45 PM MST
- Where
- Stillwater County, Molt
- Measured
- 1 in hail
- Reported by
- TRAINED SPOTTER
- Coordinates
- 45.870, -108.930
Spotter report of quarter size hail.
Hail and Damaging Wind in Montana, August 13, 1999
3 hail, 1 thunderstorm wind, as filed by the National Weather Service.
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.
The radar
The Billings radar (KBLX), 25 km away, was scanning. The volume nearest the first event began at 22:46 UTC.
Event by event
3 hail, 1 thunderstorm wind. Local standard time, as filed.
Hail, Yellowstone
- When
- August 13, 4:10 PM MST to 4:20 PM MST
- Where
- Yellowstone County, Shepherd
- Measured
- 0.75 in hail
- Reported by
- TRAINED SPOTTER
- Coordinates
- 45.950, -108.350
Spotter reports of dime size hail in and around Shepherd.
Hail, Sweet Grass
- When
- August 13, 5:45 PM MST
- Where
- Sweet Grass County, 5 mi SSE of Big Timber
- Measured
- 0.75 in hail
- Reported by
- TRAINED SPOTTER
- Coordinates
- 45.770, -109.920
Spotter report of dime size hail.
Thunderstorm Wind, Big Horn
- When
- August 13, 7:35 PM MST
- Where
- Big Horn County, Busby
- Measured
- 52 kt (60 mph)
- Reported by
- TRAINED SPOTTER
- Coordinates
- 45.530, -107.930
Spotter report of 60 mph winds which downed 1 inch tree branches.
What these are
- Hail
- Hail three-quarters of an inch or larger, or smaller hail that caused damage, filed with the largest stone measured.
- Thunderstorm Wind
- Winds from a thunderstorm of 50 knots (58 mph) or more, or lower winds that caused damage or casualties. Measured gusts are marked MG, estimated EG.
After NWS Directive 10-1605, the rules offices file Storm Data by.
The same day elsewhere
- Damaging Wind in Pennsylvania, August 13, 1999
- Hail and Damaging Winds in Georgia, August 13, 1999
- Hail and Damaging Winds in New York, August 13, 1999
- Tornadoes in New Hampshire, August 13, 1999
- Lightning Strike in Florida, August 13 to 14, 1999
- Hail and Damaging Winds in Ohio, August 13 to 14, 1999
- Hail and Damaging Winds in West Virginia, August 13, 1999
- Hail and Damaging Winds in Pennsylvania, August 13 to 24, 1999
- Damaging Wind and Lightning Strike in Ohio, August 13, 1999
- Flood and Damaging Winds in Pennsylvania, August 13, 1999
- Damaging Wind in Alabama, August 13, 1999
- Damaging Wind in Vermont, August 13, 1999
More
Every storm in Montana in 1999Every state in 1999This day in weather historyWarnings in Montana, August 1999
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: 5710978, 5710979, 5710980, 5710981.