Montana, 2001Flash Flood and Hail in Montana, July 12, 2001
July 12, 2001 · NWS BYZ · 7 events in 4 counties and zones
5 hail, 1 flash flood, 1 thunderstorm wind, as filed by the National Weather Service.
Every event with a place to put it; 1 filed by county or forecast zone are drawn at its center, in a lighter ring. 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
Open the live radar over this ground
- Deaths
- 0
- Injuries
- 0
- Property damage
- None recorded
- Crop damage
- None recorded
- Events
- 7
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 forecasters said that day
The local office's own words before the first event, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
NWS Billings, MT wrote its last area forecast discussion before the first event at Jul 12, 12:50 PM MST, 4 hours 40 minutes earlier.
Area forecast discussion, Jul 12, 12:50 PM MST, 4 hours 40 minutes before
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</html>Event by event
5 hail, 1 flash flood, 1 thunderstorm wind. Local standard time, as filed.
Flash Flood, Park
- When
- July 12, 5:30 PM MST
- Where
- Park County, Livingston
- Reported by
- TRAINED SPOTTER
- Coordinates
- 45.488, -110.526 (the zone’s center; the record gives no point)
Four feet of water in the B Street underpass. Several streets with 6 inches of water flowing like a river.
Hail, Carter
- When
- July 12, 6:58 PM MST
- Where
- Carter County, 18 mi NW of Alzada
- Measured
- 0.75 in hail
- Reported by
- TRAINED SPOTTER
- Coordinates
- 45.200, -104.683
Hail, Golden Valley
- When
- July 12, 7:15 PM MST
- Where
- Golden Valley County, 15 mi N of Lavina
- Measured
- 1.25 in hail
- Reported by
- TRAINED SPOTTER
- Coordinates
- 46.500, -108.933
Hail, Golden Valley
- When
- July 12, 8:15 PM MST
- Where
- Golden Valley County, 7 mi N of Lavina
- Measured
- 0.75 in hail
- Reported by
- TRAINED SPOTTER
- Coordinates
- 46.383, -108.933
Hail, Musselshell
- When
- July 12, 8:25 PM MST
- Where
- Musselshell County, 12 mi W of Roundup
- Measured
- 0.75 in hail
- Reported by
- TRAINED SPOTTER
- Coordinates
- 46.450, -108.783
Hail, Musselshell
- When
- July 12, 8:32 PM MST
- Where
- Musselshell County, 7 mi W of Roundup
- Measured
- 0.75 in hail
- Reported by
- TRAINED SPOTTER
- Coordinates
- 46.450, -108.683
Thunderstorm Wind, Musselshell
- When
- July 12, 8:38 PM MST
- Where
- Musselshell County, Roundup
- Measured
- 60 kt (69 mph)
- Reported by
- TRAINED SPOTTER
- Coordinates
- 46.450, -108.533
- 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.
- 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.
- Flash Flood in Washington, July 12, 20011 death · $1.5 million · 1 event
- Heat in Mississippi, July 12, 20011 death · 1 event
- Heat in Texas, July 12, 20011 death · 1 event
- Flash Flood and Hail in Montana, July 12 to 13, 2001$340,000 · 2 in hail · 9 events
- Wildfire in California, July 12, 2001$350,000 · 1 event
- Flash Flooding and Hail in Montana, July 12, 2001$200,000 · 1.75 in hail · 11 events
- Hail and Damaging Winds in Mississippi, July 12, 2001$60,000 · 50 kt wind · 18 events
- Damaging Winds in Louisiana, July 12, 2001$42,000 · 7 events
- Hail and Damaging Winds in Oklahoma, July 12, 2001$20,000 · 56 kt wind · 4 events
- Lightning Strike in Colorado, July 12, 2001$20,000 · 1 event
- Hail and Damaging Winds in Kansas, July 12, 20011 in hail · 12 events
- Damaging Wind in Missouri, July 12, 2001$15,000 · 58 kt wind · 1 event
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: 5259115, 5259109, 5259110, 5259111, 5259114, 5259112, 5259113.