Hail, Valley
- When
- July 30, 4:35 AM MST to 4:45 AM MST
- Where
- Valley County, Duck Creek
- Measured
- 1.5 in hail
- Reported by
- Trained Spotter
- Coordinates
- 47.980, -106.520
Trained spotter reported hail up to the size of ping pong balls.
Flash Flood and Hail in Montana, July 30, 2019
Warm, moist air and converging surface winds allowed thunderstorms to easily form along a subtle boundary, then suddenly grow severe as they moved toward the east and southeast into an even more favorable environment.
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
- 18
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 GGW wrote it up.
Warm, moist air and converging surface winds allowed thunderstorms to easily form along a subtle boundary, then suddenly grow severe as they moved toward the east and southeast into an even more favorable environment.
The radar
The Glasgow radar (KGGW), 26 km away, was scanning. The volume nearest the first event began at 11:32 UTC.
Event by event
13 hail, 4 thunderstorm wind, 1 flash flood. Local standard time, as filed.
Hail, McCone
- When
- July 30, 3:45 PM MST
- Where
- McCone County, 6.24 mi NW of Weldon
- Measured
- 1 in hail
- Reported by
- Trained Spotter
- Coordinates
- 47.640, -105.930
Trained spotter reported hail up to the size of quarters.
Hail, Valley
- When
- July 30, 4:55 PM MST
- Where
- Valley County, 3.58 mi NNW of Duck Creek
- Measured
- 1 in hail
- Reported by
- Trained Spotter
- Coordinates
- 48.030, -106.540
Trained spotter reported quarter size hail.
Hail, Valley
- When
- July 30, 4:55 PM MST to 5:00 PM MST
- Where
- Valley County, 5.6 mi N of Glasgow Intl Airport (Kggw)
- Measured
- 1 in hail
- Reported by
- Public
- Coordinates
- 48.300, -106.640
Public reported quarter size hail.
Hail, Valley
- When
- July 30, 4:56 PM MST
- Where
- Valley County, 3.58 mi NNW of Glasgow Intl Airport (Kggw)
- Measured
- 1 in hail
- Reported by
- Public
- Coordinates
- 48.270, -106.640
Public reported quarter size hail.
Hail, Valley
- When
- July 30, 5:00 PM MST
- Where
- Valley County, 7.66 mi N of Glasgow Intl Airport (Kggw)
- Measured
- 1.75 in hail
- Reported by
- Public
- Coordinates
- 48.330, -106.640
Public reported golf ball size hail.
Thunderstorm Wind, Prairie
- When
- July 30, 5:35 PM MST
- Where
- Prairie County, 0.84 mi NW of Terry
- Measured
- 52 kt (60 mph) estimated gust
- Reported by
- Emergency Manager
- Coordinates
- 46.790, -105.310
Prairie County DES Coordinator reported a large tree limb blow down. Wind gust speed estimated.
Thunderstorm Wind, Prairie
- When
- July 30, 5:45 PM MST
- Where
- Prairie County, 0.47 mi W of Terry
- Measured
- 56 kt (64 mph) estimated gust
- Reported by
- Storm Chaser
- Coordinates
- 46.780, -105.310
Storm chaser reported gas station awning torn off and blown 100 to 200 feet away into a nearby field, a billboard blown in and hanging from its posts, and another small structure with roof damage. Wind gust speed estimated.
Thunderstorm Wind, Prairie
- When
- July 30, 5:45 PM MST
- Where
- Prairie County, 0.84 mi NW of Terry
- Measured
- 65 kt (75 mph) estimated gust
- Reported by
- Social Media
- Coordinates
- 46.790, -105.310
Public reported, via social media, a tree blown down on a house in Terry.
Hail, Prairie
- When
- July 30, 5:45 PM MST
- Where
- Prairie County, 0.84 mi NE of Terry
- Measured
- 1.25 in hail
- Reported by
- Storm Chaser
- Coordinates
- 46.790, -105.290
Storm chaser reported hail up to the size of half dollars.
Thunderstorm Wind, Prairie
- When
- July 30, 5:45 PM MST
- Where
- Prairie County, 1 mi E of Terry
- Measured
- 56 kt (64 mph) estimated gust
- Reported by
- Storm Chaser
- Coordinates
- 46.780, -105.279
Storm chaser reported extensive damage in Terry and within 2 miles of Terry.
Hail, McCone
- When
- July 30, 6:05 PM MST
- Where
- McCone County, 11.4 mi SE of Circle McCone Co Arp
- Measured
- 1.25 in hail
- Reported by
- Social Media
- Coordinates
- 47.290, -105.420
Public reported, via social media, half dollar size hail.
Hail, Daniels
- When
- July 30, 6:26 PM MST
- Where
- Daniels County, 13.36 mi NNE of Richland
- Measured
- 1.75 in hail
- Reported by
- Public
- Coordinates
- 48.990, -105.910
Public reported hail up to the size of golf balls.
Hail, Dawson
- When
- July 30, 6:32 PM MST
- Where
- Dawson County, Lindsay
- Measured
- 1 in hail
- Reported by
- Trained Spotter
- Coordinates
- 47.220, -105.150
Trained spotter reported quarter size hail.
Hail, McCone
- When
- July 30, 6:45 PM MST
- Where
- McCone County, 9.95 mi NNW of Weldon
- Measured
- 1.5 in hail
- Reported by
- Trained Spotter
- Coordinates
- 47.720, -105.880
Trained spotter reported ping pong ball size hail.
Flash Flood, Prairie
- When
- July 30, 7:00 PM MST
- Where
- Prairie County, 0.84 mi NW of Terry to 0.08 mi NW of Terry
- Cause
- Heavy Rain
- Reported by
- Emergency Manager
- Coordinates
- 46.790, -105.310
Prairie County DES Coordinator reported water over I-94 near Terry.
Hail, Daniels
- When
- July 30, 7:10 PM MST
- Where
- Daniels County, 5.55 mi N of Peerless
- Measured
- 2 in hail
- Reported by
- Public
- Coordinates
- 48.880, -105.830
Public reported hail up to the size of hen eggs.
Hail, Daniels
- When
- July 30, 7:19 PM MST
- Where
- Daniels County, 3.91 mi SSW of Four Buttes
- Measured
- 1 in hail
- Reported by
- Trained Spotter
- Coordinates
- 48.770, -105.640
Trained spotter reported hail up to the size of quarters.
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.
- 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
- Damaging Winds and Lightning Strike in Vermont, July 30, 2019
- Lightning Strike in Florida, July 30, 2019
- Rip Current in New York, July 30 to 31, 2019
- Hail and Damaging Winds in New York, July 30, 2019
- Flash Flooding in Ohio, July 30, 2019
- Damaging Winds in Pennsylvania, July 30, 2019
- Damaging Winds in Arizona, July 30, 2019
- Heat and Damaging Winds in New York, July 30, 2019
- Hail and Damaging Winds in Texas, July 30, 2019
- Hail and Damaging Winds in Pennsylvania, July 30, 2019
- Flash Flooding and Debris Flow in Puerto Rico, July 30 to 31, 2019
- Flash Flooding in Pennsylvania, July 30, 2019
More
Every storm in Montana in 2019Every state in 2019This day in weather historyWarnings in Montana, July 2019
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 2026-10-01. Each event’s entry at NCEI: 841849, 841848, 841836, 841838, 841837, 841839, 841833, 841834, 841835, 841840, 841841, 841842, 841843, 841844, 841845, 841832, 841846, 841847.