Alert archive / Montana / Special Weather Statements in 2021
Special Weather Statement, NWS Great Falls, MT
NWS Great Falls, MT issued this special weather statement at Jul 22, 2021, 5:43 PM MDT for Petroleum County, Montana. It was in force for 17 min. No storm report in the archive falls inside the area while it was in force.
The area
The outline as issued.
The facts
- Issued
- Jul 22, 2021, 5:43 PM MDT (23:43 UTC)
- Expired
- Jul 22, 2021, 6:00 PM MDT
- In force
- 17 min
- Issued by
- NWS Great Falls, MT
County Petroleum County, MT
The radar
The Glasgow radar (KGGW), 156 km from the middle of the area, began a volume at 23:44 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.
The nearest sounding before it
Great_falls, MT (KTFX), launched 12:00Z, 11.7 hours before the alert went out and 158 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
- 160 J/kg
- Mixed-layer CIN
- -256 J/kg
- Mixed-layer LCL
- 2029 m above ground
- 0-6 km bulk shear
- 30 kt
- 0-1 km storm-relative helicity
- 14 m²/s²
- 0-3 km storm-relative helicity
- 136 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.1
The text
As transmitted.
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</html>What forecasters said that day
The local office's own words before this special weather statement 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 special weather statement went out at Jul 22, 5:40 PM MDT, 3 minutes earlier.
Area forecast discussion, Jul 22, 5:40 PM MDT, 3 minutes before
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Special weather statement, Jul 22, 4:40 PM MDT, 1 hour 3 minutes before
Special Weather Statement
National Weather Service Great Falls MT
440 PM MDT Thu Jul 22 2021
MTZ008-015-055-222315-
Madison MT-Beaverhead MT-Gallatin MT-
440 PM MDT Thu Jul 22 2021
...SIGNIFICANT WEATHER ADVISORY FOR SOUTHEASTERN MADISON...
SOUTHEASTERN BEAVERHEAD AND EASTERN GALLATIN COUNTIES UNTIL 515 PM
MDT...
At 439 PM MDT, Doppler radar was tracking strong thunderstorms along
a line extending from 12 miles northeast of Belgrade to 12 miles
northwest of Crescent Lake to 17 miles southeast of Gilmore Idaho.
Movement was east at 35 mph.
HAZARD...Winds in excess of 40 mph and pea size hail.
SOURCE...Radar indicated.
IMPACT...Gusty winds could knock down tree limbs and blow around
unsecured objects. Minor damage to outdoor objects is
possible.
Locations impacted include...
Bozeman, Belgrade, Lima, Monida, Big Sky, Bannack Pass, Bozeman Hot
Springs, Lakeview, Yellowstone Village, Gallatin Gateway, Targhee
Pass, Snowline, Red Rock Pass, Four Corners, Raynolds Pass and Monida
Pass.
This includes the following highways...
Interstate 15 between mile markers 1 and 22 .
Interstate 90 between mile markers 299 and 321.
Highway 191 between mile markers 31 and 87.
Highway 287 between mile markers 1 and 21, and between mile markers
1 and 34.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
If outdoors, consider seeking shelter inside a building.
Torrential rainfall is also occurring with these storms, and may lead
to localized flooding. Do not drive your vehicle through flooded
roadways.
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 4443 11298 4455 11305 4527 11142 4592 11111
4596 11079 4560 11080 4552 11092 4536 11092
4535 11104 4508 11104 4511 11110 4505 11115
4449 11111 4475 11139 4470 11149 4453 11151
4457 11229 4445 11239 4448 11278 4436 11284
TIME...MOT...LOC 2239Z 267DEG 31KT 4587 11094 4521 11115 4427 11303
SCLocal storm report, Jul 22, 4:47 PM MDT, 56 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE GREAT FALLS MT
447 PM MDT THU JUL 22 2021
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0216 PM TSTM WND DMG 9 NNE BELGRADE 45.88N 111.08W
07/22/2021 GALLATIN MT PUBLIC
PICTURES SUBMITTED ON SOCIAL MEDIA OF MEDIUM
SIZED OUT BUILDING FLIPPED UPSIDE DOWN FROM
STRONG WIND. TREE DAMAGE ALSO REPORTED.
&&
HARTSpecial weather statement, Jul 22, 4:52 PM MDT, 51 minutes before
Special Weather Statement
National Weather Service Great Falls MT
452 PM MDT Thu Jul 22 2021
MTZ013-047-222330-
Chouteau MT-Blaine MT-
452 PM MDT Thu Jul 22 2021
...STRONG THUNDERSTORM TO IMPACT SOUTHWESTERN BLAINE AND EAST
CENTRAL CHOUTEAU COUNTIES UNTIL 530 PM MDT...
At 451 PM MDT, Doppler radar was tracking a strong thunderstorm 21
miles south of St. Pierre, or 21 miles southeast of Big Sandy, moving
northeast at 45 mph.
HAZARD...Wind gusts up to 50 mph.
SOURCE...Radar indicated.
IMPACT...Gusty winds could knock down tree limbs and blow around
unsecured objects.
This storm will remain over mainly rural areas of southwestern Blaine
and east central Chouteau Counties.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
If outdoors, consider seeking shelter inside a building.
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 4786 10986 4798 10998 4825 10917 4815 10885
4795 10889 4784 10961
TIME...MOT...LOC 2251Z 246DEG 39KT 4794 10982
HARTSpecial weather statement, Jul 22, 5:35 PM MDT, 8 minutes before
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</html>Special weather statement, Jul 22, 5:43 PM MDT, 0 minutes before
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</html>The office that day
Everything else NWS Great Falls, MT issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 21, 6:01 PM MDT | Special Weather Statement | TFX | Broadwater, Jefferson, Meagher | 29 min |
| Jul 21, 6:08 PM MDT | Special Weather Statement | TFX | Cascade | 22 min |
| Jul 21, 6:12 PM MDT | Special Weather Statement | TFX | Liberty | 33 min |
| Jul 21, 6:32 PM MDT | Special Weather Statement | TFX | Broadwater | 28 min |
| Jul 21, 6:35 PM MDT | Special Weather Statement | TFX | Cascade, Chouteau | 25 min |
| Jul 21, 6:41 PM MDT | Special Weather Statement | TFX | Teton | 34 min |
| Jul 21, 6:55 PM MDT | Special Weather Statement | TFX | Cascade, Chouteau, Hill, Judith Basin, Liberty, Meagher | 35 min |
| Jul 21, 7:12 PM MDT | Special Weather Statement | TFX | Teton | 33 min |
| Jul 21, 7:14 PM MDT | Special Weather Statement | TFX | Lewis and Clark | 31 min |
| Jul 21, 7:30 PM MDT | Special Weather Statement | TFX | Blaine | 30 min |
| Jul 21, 7:34 PM MDT | Special Weather Statement | TFX | Chouteau | 26 min |
| Jul 21, 7:53 PM MDT | Special Weather Statement | TFX | Chouteau | 37 min |
| Jul 21, 7:56 PM MDT | Severe Thunderstorm Warning | TFX | Lewis and Clark | 34 min |
| Jul 21, 7:59 PM MDT | Special Weather Statement | TFX | Pondera | 31 min |
| Jul 21, 8:01 PM MDT | Special Weather Statement | TFX | Judith Basin | 29 min |
| Jul 21, 8:03 PM MDT | Special Weather Statement | TFX | Blaine | 27 min |
| Jul 21, 8:09 PM MDT | Special Weather Statement | TFX | Madison | 36 min |
| Jul 21, 8:22 PM MDT | Special Weather Statement | TFX | Lewis and Clark | 23 min |
| Jul 21, 8:29 PM MDT | Special Weather Statement | TFX | Fergus | 31 min |
| Jul 21, 8:33 PM MDT | Special Weather Statement | TFX | Hill | 27 min |
| Jul 21, 8:34 PM MDT | Special Weather Statement | TFX | Teton | 26 min |
| Jul 21, 8:36 PM MDT | Special Weather Statement | TFX | Blaine | 24 min |
| Jul 21, 8:37 PM MDT | Special Weather Statement | TFX | Toole | 38 min |
| Jul 21, 8:45 PM MDT | Special Weather Statement | TFX | Madison | 30 min |
| Jul 21, 8:54 PM MDT | Severe Thunderstorm Warning | TFX | Lewis and Clark, Teton | 36 min |
| Jul 21, 9:04 PM MDT | Special Weather Statement | TFX | Blaine, Fergus, Hill | 26 min |
| Jul 21, 9:12 PM MDT | Special Weather Statement | TFX | Teton | 33 min |
| Jul 21, 9:14 PM MDT | Special Weather Statement | TFX | Liberty | 16 min |
| Jul 21, 9:36 PM MDT | Special Weather Statement | TFX | Blaine, Fergus | 24 min |
| Jul 21, 9:44 PM MDT | Special Weather Statement | TFX | Gallatin, Madison | 31 min |
| Jul 21, 9:55 PM MDT | Special Weather Statement | TFX | Teton | 35 min |
| Jul 21, 10:04 PM MDT | Special Weather Statement | TFX | Blaine | 41 min |
| Jul 22, 1:34 PM MDT | Special Weather Statement | TFX | Madison | 41 min |
| Jul 22, 2:01 PM MDT | Special Weather Statement | TFX | Gallatin | 29 min |
| Jul 22, 2:13 PM MDT | Severe Thunderstorm Warning | TFX | Gallatin | 32 min |
| Jul 22, 2:24 PM MDT | Special Weather Statement | TFX | Beaverhead, Gallatin, Madison | 66 min |
| Jul 22, 3:04 PM MDT | Special Weather Statement | TFX | Broadwater | 26 min |
| Jul 22, 3:27 PM MDT | Special Weather Statement | TFX | Fergus, Judith Basin | 48 min |
| Jul 22, 3:30 PM MDT | Special Weather Statement | TFX | Gallatin, Madison | 30 min |
| Jul 22, 3:32 PM MDT | Special Weather Statement | TFX | Gallatin, Madison | 28 min |
| Jul 22, 3:54 PM MDT | Special Weather Statement | TFX | Broadwater, Meagher | 36 min |
| Jul 22, 4:06 PM MDT | Special Weather Statement | TFX | Gallatin | 39 min |
| Jul 22, 4:18 PM MDT | Special Weather Statement | TFX | Fergus | 42 min |
| Jul 22, 4:36 PM MDT | Special Weather Statement | TFX | Meagher | 24 min |
| Jul 22, 4:40 PM MDT | Special Weather Statement | TFX | Gallatin | 35 min |
| Jul 22, 4:52 PM MDT | Special Weather Statement | TFX | Blaine | 38 min |
| Jul 22, 5:35 PM MDT | Special Weather Statement | TFX | Madison | 40 min |
| Jul 22, 5:36 PM MDT | Special Weather Statement | TFX | Judith Basin | 24 min |
Nearby
Special Weather Statements in Montana, 2021Every special weather statement 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.