Lewis and Clark County, Montana
Tornadoes, hail, floods and severe storms recorded here between 1953 and 2026, from NOAA's Storm Events Database. Search an address to see which tornadoes came closest to it.
4
Tornado reports
118
Hail reports
39
Floods since 1996
317
All events
0
Deaths
$5.9M
Property damage
Tornado paths in Lewis and Clark County
The part of each tornado’s path NOAA recorded in this county, 4 in all. Zoom in and the paths widen to their surveyed width.
EF0EF1EF2EF3EF4EF5Unrated
Year by year
All storm eventsTornadoes
NOAA's storm database records tornadoes back to 1950 and hail and thunderstorm wind back to 1955, but floods only from 1996 on. Older floods are missing here. For those, the U.S. Geological Survey's stream gauge records and flood reports are the place to look.
Most significant events
The strongest tornadoes, deadliest events and biggest damage here, up to 50.
Continued Canyon Ferry Complex - includes Broadwater County, 38570 acres burned, cause unknown, 13 residents destroyed, 37 outbuildings destroyed.
Canyon Ferry Complex - includes Broadwater County, 38570 acres burned, 13 residences destroyed, 37 outbuildings destroyed, unknown cause, continued past July 31.
Hail Hail
Mostly nickel sized hail with a few quarter sized mixed in.
Hail Hail
MPING public report of quarter sized hail.
Hail Hail
A member of the public shared a photo of quarter-sized hail on social media.
Thunderstorm Wind Thunderstorm Wind
Spotter network report of a large tree down across a fence. Time of damage estimated using radar.
Thunderstorm Wind Thunderstorm Wind
AWOS station K1GM Golf. Thunderstorm wind gust of 51 mph.
Debris Flow Debris Flow
Jimtown Road and the Riverside Campground was closed due to debris flow from the burn scar flooding. Media also reported a 15 foot debris flow caused by the flooding washed away two trucks and a shed to the shores of Canyon Ferry Lake.
Thunderstorm Wind Thunderstorm Wind
AWOS station K1GM Golf measured a 59 mph wind gust.
Thunderstorm Wind Thunderstorm Wind
ASOS station KHLN Helena Airport measured a 60 mph wind gust.
Thunderstorm Wind Thunderstorm Wind
AWOS station K1GM Golf measured a 61 mph wind gust.
Thunderstorm Wind Thunderstorm Wind
ASOS station KHLN Helena Airport measured a 62 mph wind gust.
Thunderstorm Wind Thunderstorm Wind
A 61 mph wind gust measured at the Helena Airport.
Thunderstorm Wind Thunderstorm Wind
Ambient Weather Sensor near East Helena measured a severe gust.
Flash Flood Flash Flood
Lewis and Clark County emergency management reported that Jimtown rd was closed due to a water/debris flow flash flood originating from the Horse Gulch burn scar. Broadcast media report: Although 12 campers were stranded as a result of the flash flood, no one was injured, and no …
Thunderstorm Wind Thunderstorm Wind
Trained spotter reports a 62 mph gust.
Thunderstorm Wind Thunderstorm Wind
Personal weather sensor measured a 62 mph gust.
Thunderstorm Wind Thunderstorm Wind
Public weather station reported a gust of 58 mph.
Thunderstorm Wind Thunderstorm Wind
MDT sensor MTSBN Sieben Flats measured a severe gust.
Thunderstorm Wind Thunderstorm Wind
Mesonet station EW3831 measured a 61 mph gust.
Thunderstorm Wind Thunderstorm Wind
AWOS sensor K1GM Golf measured a severe gust.
Hail Hail
Trained spotter reports hail of 1.5 inches in diameter.
Hail Hail
Trained spotter reported heavy rain and quarter sized hail.
Thunderstorm Wind Thunderstorm Wind
ASOS station KHLN Helena Airport measured a 59 mph gust from outflow.
Thunderstorm Wind Thunderstorm Wind
ASOS station KHLN Helena Airport measured a 59 mph gust from outflow.
Thunderstorm Wind Thunderstorm Wind
Measured by MT Department of Transportation site Bowmans Corner.
Thunderstorm Wind Thunderstorm Wind
Measured via military AWOS station K1GM Golf.
Thunderstorm Wind Thunderstorm Wind
ASOS station KHLN Helena Airport measured a severe caliber gust behind the main line of thunderstorms.
Two male individuals (ages 22 and 21) were struck by lightning while playing disc golf. Both were knocked unconscious. One of the individuals regained consciousness and performed CPR on the other, who was later flown to Salt Lake City for advanced medical care. As of early July 2…
Flash Flood Flash Flood
Spotter reported water flowing across several secondary roads as well as culverts flooding.
Debris Flow Debris Flow
A significant debris flow crossed Benchmark Road, west of Ford Creek, resulting in the road being impassable from debris and damage.
Flood Flood
The Mid-Canon fishing access site near Craig was closed due to flooding by high river levels along the Missouri River.
Flood Flood
Lewis and Clark County Sheriff's Office reported the high bridge over the Dearborn River was washed out. Public works closed the road at Flat Creek. Several secondary roads across the area were flooded at times. Flooding across northwest Helena also occurred, especially west of B…
Thunderstorm Wind Thunderstorm Wind
Mesonet station MTMDP Macdonald Pass reported 54 knot wind gust.
Thunderstorm Wind Thunderstorm Wind
AWOS station K1GM Golf reported 53 knot wind gust.
Thunderstorm Wind Thunderstorm Wind
ASOS station KHLN Helena Airport reported 53 knot wind gust.
Thunderstorm Wind Thunderstorm Wind
Ambient weather station NE of Helena Airport reported 50 knot wind gust.
Thunderstorm Wind Thunderstorm Wind
Ambient weather station ENE of Iron reported gust of 58.2 mph.
Thunderstorm Wind Thunderstorm Wind
AWOS station K1GM Golf reported 51 knot wind gust.
Thunderstorm Wind Thunderstorm Wind
Mesonet station Sieben Flats MDT.
Hail Hail
Trained spotter reported up to penny sized hail.
Thunderstorm Wind Thunderstorm Wind
An ambient weather station measured 62 mph wind gust near Lake Helena.
Hail Hail
Photo on social media shows ground covering hail with up to quarter sized stones. Time estimated from radar.
Hail Hail
Trained spotter reported 1 inch hail in Marysville.
Heavy Rain Heavy Rain
Trained spotter reported 1.98 inches of rainfall per hour. Winds gusting 32 mph.
Thunderstorm Wind Thunderstorm Wind
DOT sensor on MacDonald Pass measured 64 mph wind gust. Reports heavy rain as well.
Heavy Rain Heavy Rain
Rainfall of 0.73 inches fell in 16 minutes.
Heavy Rain Heavy Rain
Rainfall of 1.11 INCHES recorded in 15 min per Ambient Weather station.
Heavy Rain Heavy Rain
Rainfall of 1.04 inches measured in 10 min per Ambient Weather station.
Heavy Rain Heavy Rain
Rainfall amount fell in 10 min per Ambient Weather station.
Events by year, as a table
| Year | Events | Tornadoes |
|---|---|---|
| 2026 | 3 | 0 |
| 2025 | 8 | 0 |
| 2024 | 12 | 0 |
| 2023 | 8 | 0 |
| 2022 | 28 | 0 |
| 2021 | 2 | 0 |
| 2020 | 19 | 0 |
| 2019 | 9 | 0 |
| 2018 | 15 | 0 |
| 2017 | 12 | 0 |
| 2016 | 2 | 0 |
| 2014 | 6 | 0 |
| 2013 | 8 | 0 |
| 2012 | 5 | 0 |
| 2011 | 4 | 0 |
| 2010 | 4 | 0 |
| 2009 | 4 | 0 |
| 2008 | 17 | 0 |
| 2007 | 10 | 0 |
| 2006 | 4 | 0 |
| 2005 | 8 | 0 |
| 2004 | 9 | 0 |
| 2003 | 9 | 0 |
| 2002 | 10 | 0 |
| 2001 | 20 | 0 |
| 2000 | 11 | 0 |
| 1999 | 3 | 0 |
| 1998 | 4 | 0 |
| 1997 | 7 | 1 |
| 1996 | 4 | 0 |
| 1995 | 1 | 0 |
| 1994 | 1 | 0 |
| 1992 | 3 | 1 |
| 1991 | 4 | 0 |
| 1990 | 3 | 0 |
| 1989 | 8 | 0 |
| 1988 | 3 | 0 |
| 1985 | 1 | 0 |
| 1984 | 3 | 0 |
| 1982 | 8 | 0 |
| 1976 | 1 | 0 |
| 1975 | 6 | 0 |
| 1974 | 1 | 0 |
| 1970 | 1 | 0 |
| 1966 | 1 | 0 |
| 1964 | 2 | 0 |
| 1960 | 1 | 1 |
| 1959 | 1 | 0 |
| 1957 | 1 | 0 |
| 1955 | 1 | 0 |
| 1953 | 1 | 1 |
Search your address
See every tornado that passed within 25 miles of a place in Lewis and Clark County, measured to its path.
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