Alert archive / Montana / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 38, NWS Great Falls, MT
NWS Great Falls, MT issued this severe thunderstorm warning at Jul 11, 2021, 3:03 PM MDT for Glacier County, Toole County, Montana. It was in force for 42 min. 1 report came from inside the area while it was in force.
The area
The outline as issued, with what was reported inside it.
The facts
- Issued
- Jul 11, 2021, 3:03 PM MDT (21:03 UTC)
- Expired
- Jul 11, 2021, 3:45 PM MDT
- In force
- 42 min
- Issued by
- NWS Great Falls, MT
- Area
- Storm-based polygon
- Hail
- 1.5 in
- Wind
- 70.0 mph
Counties Glacier County, MT, Toole County, MT
The radar
The Great Falls radar (KTFX), 153 km from the middle of the area, began a volume at 21:07 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 was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Jul 11, 3:24 PM MDT | TSTM WND DMG | Cut Bank, MT | POWER LINES DOWN IN CUT BANK WITH A HIGH NUMBER OF POWER OUTAGES. ALSO REPORTED A TREE WAS DOWNED. |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The nearest sounding before it
Great_falls, MT (KTFX), launched 12:00Z, 9.1 hours before the alert went out and 185 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.
- Mixed-layer CAPE
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 3738 m above ground
- 0-6 km bulk shear
- 21 kt
- 0-1 km storm-relative helicity
- -10 m²/s²
- 0-3 km storm-relative helicity
- 104 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
285
WUUS55 KTFX 112103
SVRTFX
MTC035-101-112145-
/O.NEW.KTFX.SV.W.0038.210711T2103Z-210711T2145Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Great Falls MT
303 PM MDT Sun Jul 11 2021
The National Weather Service in Great Falls has issued a
* Severe Thunderstorm Warning for...
East central Glacier County in north central Montana...
West central Toole County in north central Montana...
* Until 345 PM MDT.
* At 302 PM MDT, a severe thunderstorm was located 16 miles northwest
of Cut Bank, moving southeast at 45 mph.
HAZARD...70 mph wind gusts and ping pong ball size hail.
SOURCE...Radar indicated.
IMPACT...People and animals outdoors will be injured. Expect hail
damage to roofs, siding, windows, and vehicles. Expect
considerable tree damage. Wind damage is also likely to
mobile homes, roofs, and outbuildings.
* Locations impacted include...
Shelby, Cut Bank, Kevin, Ethridge, Oilmont and Santa Rita.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
Large hail and damaging winds and continuous cloud to ground
lightning is occurring with this storm. Move indoors immediately.
Lightning is one of nature's leading killers. Remember, if you can
hear thunder, you are close enough to be struck by lightning.
&&
LAT...LON 4875 11266 4892 11242 4870 11165 4840 11189
TIME...MOT...LOC 2102Z 300DEG 41KT 4882 11254
HAIL...1.50IN
WIND...70MPH
$$
HART2 follow-up statements
618
WWUS55 KTFX 112124
SVSTFX
Severe Weather Statement
National Weather Service Great Falls MT
324 PM MDT Sun Jul 11 2021
MTC035-101-112145-
/O.CON.KTFX.SV.W.0038.000000T0000Z-210711T2145Z/
Glacier MT-Toole MT-
324 PM MDT Sun Jul 11 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 345 PM MDT
FOR EAST CENTRAL GLACIER AND WEST CENTRAL TOOLE COUNTIES...
At 323 PM MDT, a severe thunderstorm was located near Cut Bank,
moving southeast at 45 mph.
HAZARD...Ping pong ball size hail and 60 mph wind gusts.
SOURCE...Radar indicated.
IMPACT...People and animals outdoors will be injured. Expect hail
damage to roofs, siding, windows, and vehicles. Expect wind
damage to roofs, siding, and trees.
Locations impacted include...
Shelby, Kevin, Ethridge, Oilmont and Santa Rita.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
Frequent cloud to ground lightning is occurring with this storm.
Move indoors immediately. Lightning is one of nature's leading
killers. Remember, if you can hear thunder, you are close enough to
be struck by lightning.
&&
LAT...LON 4874 11250 4889 11231 4870 11165 4840 11189
TIME...MOT...LOC 2123Z 299DEG 39KT 4871 11224
HAIL...1.50IN
WIND...60MPH
$$
HART887
WWUS55 KTFX 112135
SVSTFX
Severe Weather Statement
National Weather Service Great Falls MT
335 PM MDT Sun Jul 11 2021
MTC035-101-112145-
/O.CON.KTFX.SV.W.0038.000000T0000Z-210711T2145Z/
Glacier MT-Toole MT-
335 PM MDT Sun Jul 11 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 345 PM MDT
FOR EAST CENTRAL GLACIER AND WEST CENTRAL TOOLE COUNTIES...
At 334 PM MDT, a severe thunderstorm was located 8 miles southwest of
Kevin, or 11 miles east of Cut Bank, moving southeast at 45 mph.
HAZARD...Golf ball size hail and 60 mph wind gusts.
SOURCE...Radar indicated. A 60 mph wind gust was also recently
measured at the Cut Bank airport.
IMPACT...People and animals outdoors will be injured. Expect hail
damage to roofs, siding, windows, and vehicles. Expect wind
damage to roofs, siding, and trees.
Locations impacted include...
Shelby, Kevin, Ethridge and Oilmont.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
Continuous cloud to ground lightning is occurring with this storm.
Move indoors immediately. Lightning is one of nature's leading
killers. Remember, if you can hear thunder, you are close enough to
be struck by lightning.
&&
LAT...LON 4866 11235 4885 11218 4870 11165 4840 11189
TIME...MOT...LOC 2134Z 299DEG 39KT 4865 11209
HAIL...1.75IN
WIND...60MPH
$$
HARTThe office that day
Everything else NWS Great Falls, MT issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 11, 12:33 AM MDT | Red Flag Warning | TFX | Blaine, Broadwater, Cascade, Chouteau, Fergus, Gallatin and 12 more | 20 hr |
| Jul 11, 2:18 PM MDT | Special Weather Statement | TFX | Glacier | 42 min |
| Jul 11, 2:28 PM MDT | Severe Thunderstorm Warning | TFX | Glacier | 50 min |
| Jul 11, 2:58 PM MDT | Special Weather Statement | TFX | Glacier | 32 min |
| Jul 11, 3:40 PM MDT | Severe Thunderstorm Warning | TFX | Toole | 50 min |
| Jul 11, 4:18 PM MDT | Severe Thunderstorm Warning | TFX | Liberty, Toole | 27 min |
| Jul 11, 4:36 PM MDT | Special Weather Statement | TFX | Pondera | 24 min |
| Jul 11, 4:47 PM MDT | Special Weather Statement | TFX | Chouteau | 28 min |
| Jul 11, 5:05 PM MDT | Special Weather Statement | TFX | Pondera | 25 min |
| Jul 11, 5:11 PM MDT | Severe Thunderstorm Warning | TFX | Chouteau, Hill | 49 min |
| Jul 11, 5:55 PM MDT | Severe Thunderstorm Warning | TFX | Blaine, Chouteau, Hill | 65 min |
Nearby
Severe Thunderstorm Warnings in Montana, 2021Every severe thunderstorm warning in 2021
Sources
The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.