Alert archive / Montana / Severe Thunderstorm Warnings in 2024

Severe Thunderstorm Warning 134, NWS Great Falls, MT

September 11, 20244 counties in Montana

NWS Great Falls, MT issued this severe thunderstorm warning at Sep 11, 2024, 6:13 PM MDT for 4 counties in Montana. It was in force for 32 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: Sep 11, 2024, 6:13 PM MDT (00:13 UTC)
Expired: Sep 11, 2024, 6:45 PM MDT
In force: 32 min
Issued by: NWS Great Falls, MT
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

Counties Broadwater County, MT, Cascade County, MT, Lewis and Clark County, MT, Meagher County, MT

The radar

The Great Falls radar (KTFX), 70 km from the middle of the area, began a volume at 00:15 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

What forecasters said that day

The local office's own words before this severe thunderstorm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Great Falls, MT wrote its last area forecast discussion before this severe thunderstorm warning went out at Sep 11, 6:05 PM MDT, 8 minutes earlier.

Area forecast discussion, Sep 11, 6:05 PM MDT, 8 minutes before

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In the hours before

Special weather statement, Sep 11, 5:27 PM MDT, 46 minutes before

Special Weather Statement
National Weather Service Great Falls MT
527 PM MDT Wed Sep 11 2024

MTZ315-322-324-120000-
Elkhorn and Boulder Mountains MT-Missouri Headwaters MT-
Upper Blackfoot and MacDonald Pass MT-
527 PM MDT Wed Sep 11 2024

...A STRONG THUNDERSTORM WILL IMPACT SOUTHERN LEWIS AND CLARK AND
NORTH CENTRAL JEFFERSON COUNTIES THROUGH 600 PM MDT...

At 527 PM MDT, Doppler radar was tracking a strong thunderstorm over
Boulder, moving north at 30 mph.

HAZARD...Wind gusts up to 50 mph and penny size hail.

SOURCE...Radar indicated.

IMPACT...Gusty winds could knock down tree limbs and blow around
         unsecured objects. Minor hail damage to vegetation is
         possible.

Locations impacted include...
Boulder, Wickes, Jefferson City, and Corbin.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

Frequent cloud to ground lightning is occurring with this storm.
Lightning can strike 10 miles away from a thunderstorm. Seek a safe
shelter inside a building or vehicle.

This storm may intensify, so be certain to monitor local radio
stations and available television stations for additional information
and possible warnings from the National Weather Service.

&&

LAT...LON 4614 11203 4615 11221 4644 11227 4643 11190
TIME...MOT...LOC 2327Z 185DEG 26KT 4622 11211

MAX HAIL SIZE...0.75 IN
MAX WIND GUST...50 MPH

IG

Special weather statement, Sep 11, 5:34 PM MDT, 39 minutes before

Special Weather Statement
National Weather Service Great Falls MT
534 PM MDT Wed Sep 11 2024

MTZ315-316-319-320-322-120000-
Helena Valley MT-Elkhorn and Boulder Mountains MT-
Big Belt, Bridger and Castle Mountains MT-
Upper Blackfoot and MacDonald Pass MT-Gates of the Mountains MT-
534 PM MDT Wed Sep 11 2024

...A STRONG THUNDERSTORM WILL IMPACT SOUTHEASTERN LEWIS AND CLARK AND
NORTH CENTRAL JEFFERSON COUNTIES THROUGH 600 PM MDT...

At 534 PM MDT, Doppler radar was tracking a strong thunderstorm over
Helena, moving north at 35 mph.

HAZARD...Wind gusts up to 50 mph and half inch hail.

SOURCE...Radar indicated.

IMPACT...Gusty winds could knock down tree limbs and blow around
         unsecured objects. Minor hail damage to vegetation is
         possible.

Locations impacted include...
Helena, East Helena, Black Sandy State Park, and Spring Meadow Lake
State Park.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

Frequent cloud to ground lightning is occurring with this storm.
Lightning can strike 10 miles away from a thunderstorm. Seek a safe
shelter inside a building or vehicle.

This storm may intensify, so be certain to monitor local radio
stations and available television stations for additional information
and possible warnings from the National Weather Service.

&&

LAT...LON 4655 11191 4656 11210 4688 11211 4684 11179
TIME...MOT...LOC 2334Z 187DEG 29KT 4663 11202

MAX HAIL SIZE...0.50 IN
MAX WIND GUST...50 MPH

IG

Special weather statement, Sep 11, 5:43 PM MDT, 30 minutes before

Special Weather Statement
National Weather Service Great Falls MT
543 PM MDT Wed Sep 11 2024

MTZ330-120015-
Gallatin and Madison County Mountains and Centennial Mountains MT-
543 PM MDT Wed Sep 11 2024

...STRONG THUNDERSTORMS WILL IMPACT SOUTHEASTERN MADISON...
SOUTHEASTERN BEAVERHEAD AND SOUTH CENTRAL GALLATIN COUNTIES THROUGH
615 PM MDT...

At 539 PM MDT, Doppler radar was tracking strong thunderstorms along
a line extending from 9 miles northwest of Henrys Lake to 7 miles
northwest of Shotgun Village to Island Park Reservoir. Movement was
northeast at 60 mph.

HAZARD...Wind gusts up to 50 mph.

SOURCE...Radar indicated.

IMPACT...Gusty winds could knock down tree limbs and blow around
         unsecured objects.

Locations impacted include...
West Yellowstone, Targhee Pass, Raynolds Pass, Lakeview, Yellowstone
Village, and Red Rock Pass.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

Frequent cloud to ground lightning is occurring with these storms.
Lightning can strike 10 miles away from a thunderstorm. Seek a safe
shelter inside a building or vehicle.

These storms may intensify, so be certain to monitor local radio
stations and available television stations for additional information
and possible warnings from the National Weather Service.

&&

LAT...LON 4456 11187 4456 11192 4511 11105 4508 11104
      4504 11112 4452 11110 4451 11113 4457 11118
      4458 11123 4462 11122 4475 11138 4471 11141
      4470 11149 4466 11147 4459 11153 4454 11148
      4456 11171 4451 11182
TIME...MOT...LOC 2339Z 229DEG 53KT 4471 11157 4455 11155 4439 11152

MAX HAIL SIZE...0.00 IN
MAX WIND GUST...50 MPH

IG

Special weather statement, Sep 11, 5:43 PM MDT, 30 minutes before

Special Weather Statement
National Weather Service Great Falls MT
543 PM MDT Wed Sep 11 2024

MTZ330-120015-
Gallatin and Madison County Mountains and Centennial Mountains MT-
543 PM MDT Wed Sep 11 2024

...STRONG THUNDERSTORMS WILL IMPACT SOUTHEASTERN MADISON...
SOUTHEASTERN BEAVERHEAD AND SOUTH CENTRAL GALLATIN COUNTIES THROUGH
615 PM MDT...

At 543 PM MDT, Doppler radar was tracking strong thunderstorms along
a line extending from 20 miles north of Shotgun Village to 10 miles
southwest of Henrys Lake to near Island Park Reservoir. Movement was
northeast at 55 mph.

HAZARD...Wind gusts up to 50 mph and half inch hail.

SOURCE...Radar indicated.

IMPACT...Gusty winds could knock down tree limbs and blow around
         unsecured objects. Minor hail damage to vegetation is
         possible.

Locations impacted include...
West Yellowstone, Targhee Pass, Raynolds Pass, Yellowstone Village,
and Red Rock Pass.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

Frequent cloud to ground lightning is occurring with these storms.
Lightning can strike 10 miles away from a thunderstorm. Seek a safe
shelter inside a building or vehicle.

These storms may intensify, so be certain to monitor local radio
stations and available television stations for additional information
and possible warnings from the National Weather Service.

&&

LAT...LON 4453 11178 4467 11183 4527 11105 4508 11104
      4511 11110 4505 11115 4501 11110 4460 11110
      4456 11117 4457 11123 4462 11122 4475 11139
      4471 11141 4470 11149 4466 11147 4459 11153
      4454 11148 4456 11159
TIME...MOT...LOC 2343Z 215DEG 47KT 4474 11161 4458 11159 4444 11162

MAX HAIL SIZE...0.50 IN
MAX WIND GUST...50 MPH

IG

Local storm report, Sep 11, 5:46 PM MDT, 27 minutes before

Preliminary Local Storm Report
National Weather Service Great Falls MT
546 PM MDT Wed Sep 11 2024

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0545 PM     Hail             1 SSE Helena            46.59N 112.02W
09/11/2024  M0.70 Inch       Lewis and Clark    MT   Public

            Report of dime sized hail, along with minor
            street flooding.

&&

ML

Local storm report, Sep 11, 5:58 PM MDT, 15 minutes before

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The office that day

Everything else NWS Great Falls, MT issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Sep 11, 6:45 PM MDT	Severe Thunderstorm Warning Considerable damage threat	TFX	Cascade, Chouteau, Judith Basin, Meagher	30 min
Sep 11, 7:15 PM MDT	Special Weather Statement	TFX	Cascade	30 min
Sep 11, 7:30 PM MDT	Severe Thunderstorm Warning Considerable damage threat	TFX	Broadwater, Gallatin, Meagher	30 min
Sep 11, 7:44 PM MDT	Special Weather Statement	TFX	Judith Basin	31 min
Sep 11, 7:58 PM MDT	Special Weather Statement	TFX	Meagher	62 min
Sep 11, 8:11 PM MDT	Special Weather Statement	TFX	Chouteau, Judith Basin	34 min
Sep 11, 8:26 PM MDT	Flash Flood Warning	TFX	Broadwater, Lewis and Clark	3 hr
Sep 11, 9:24 PM MDT	Flash Flood Watch	TFX	Broadwater, Gallatin, Lewis and Clark, Meagher	27 hr
Sep 12, 4:09 AM MDT	Winter Weather Advisory	TFX	Beaverhead, Gallatin, Madison	22 hr
Sep 12, 6:57 AM MDT	Special Weather Statement	TFX	Broadwater	48 min
Sep 12, 7:17 AM MDT	Flash Flood Warning	TFX	Broadwater, Lewis and Clark	3 hr

Nearby

Severe Thunderstorm Warnings in Montana, 2024 Every severe thunderstorm warning in 2024

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; radar from the NEXRAD Level II archive.