Montana, 2020Hail and Damaging Winds in Montana, July 3, 2020
July 3, 2020 · NWS GGW · 6 events in 3 counties and zones
A favorable wind pattern, both aloft and at the surface, combined with a very unstable atmosphere to form strong thunderstorms off the higher terrain of southern Montana and northern Wyoming. These storms eventually became severe as they moved northeastward through eastern Montana.
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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- Deaths
- 0
- Injuries
- 0
- Property damage
- None recorded
- Crop damage
- None recorded
- Events
- 6
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.
A favorable wind pattern, both aloft and at the surface, combined with a very unstable atmosphere to form strong thunderstorms off the higher terrain of southern Montana and northern Wyoming. These storms eventually became severe as they moved northeastward through eastern Montana.
Hail, McCone
- When
- July 3, 5:49 PM MST to 6:00 PM MST
- Where
- McCone County, 18.23 mi W of Weldon
- Measured
- 1.75 in hail
- Reported by
- Trained Spotter
- Coordinates
- 47.560, -106.220
Trained spotter reported hail up the size of golf balls for more than ten minutes.
Hail, McCone
- When
- July 3, 6:15 PM MST
- Where
- McCone County, 4.27 mi W of Brockway
- Measured
- 1 in hail
- Reported by
- Trained Spotter
- Coordinates
- 47.290, -105.860
Trained spotter reported plentiful hail up to the size of quarters.
Hail, McCone
- When
- July 3, 6:40 PM MST
- Where
- McCone County, 17.56 mi SSE of Ft Peck Lake Handar
- Measured
- 1 in hail
- Reported by
- Trained Spotter
- Coordinates
- 47.800, -106.160
Trained spotter reported quarter size hail.
Hail, Wibaux
- When
- July 3, 7:00 PM MST to 7:15 PM MST
- Where
- Wibaux County, 2.46 mi WSW of Beaver Hill Dot
- Measured
- 1 in hail
- Reported by
- Trained Spotter
- Coordinates
- 46.990, -104.300
Trained spotter reported quarter size hail, lasting for approximately 15 minutes, as well as wind gusts up to 50 mph.
Thunderstorm Wind, Wibaux
- When
- July 3, 7:10 PM MST
- Where
- Wibaux County, Pine Hill Raws
- Measured
- 51 kt (59 mph) measured gust
- Reported by
- RAWS
- Coordinates
- 46.780, -104.580
At the Pine Hills RAWS site (PNHM8), a 59 mph wind gust was recorded. Time estimated by radar.
Thunderstorm Wind, Roosevelt
- When
- July 3, 8:47 PM MST
- Where
- Roosevelt County, 1.15 mi NE of Nd Stateline Hwy 2 Dot
- Measured
- 58 kt (67 mph) measured gust
- Reported by
- Department of Highways
- Coordinates
- 48.140, -104.050
At the US-2 @Stateline DOT site (MTSTA), a 67 mph gust was recorded.
- 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.
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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: 899658, 899663, 899664, 899665, 899674, 899675.