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 Aug 2, 2021, 6:08 PM MDT for Chouteau County, Hill County, Liberty County, Montana. It was in force for 37 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
- Aug 2, 2021, 6:08 PM MDT (00:08 UTC)
- Expired
- Aug 2, 2021, 6:45 PM MDT
- In force
- 37 min
- Issued by
- NWS Great Falls, MT
Counties Chouteau County, MT, Hill County, MT, Liberty County, MT
The radar
The Great Falls radar (KTFX), 94 km from the middle of the area, began a volume at 00:09 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 00:00Z, 0.1 hours before the alert went out and 87 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
- 177 J/kg
- Mixed-layer CIN
- -103 J/kg
- Mixed-layer LCL
- 1940 m above ground
- 0-6 km bulk shear
- 21 kt
- 0-1 km storm-relative helicity
- -18 m²/s²
- 0-3 km storm-relative helicity
- 56 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
884
WWUS85 KTFX 030008
SPSTFX
Special Weather Statement
National Weather Service Great Falls MT
608 PM MDT Mon Aug 2 2021
MTZ011-013-045-046-049-030045-
Chouteau-Liberty-Eastern Teton-Hill-Eastern Pondera-
608 PM MDT Mon Aug 2 2021
...AN AREA OF STRONG THUNDERSTORMS WILL AFFECT SOUTHEASTERN
PONDERA...LIBERTY...EAST CENTRAL TETON...HILL AND CHOUTEAU
COUNTIES...
At 605 PM MDT, strong thunderstorms were moving northeast at 15 mph
over much of north central Montana.
Periods of heavy rain and winds in excess of 30 mph are possible
with this storm.
Locations impacted include...
Havre, Fort Benton, Chester, Big Sandy, Dutton, Geraldine, Beaver
Creek, Lothair, Joplin, Brady, The Knees, Azure, Inverness, Gildford,
Sangrey, Boneau, Box Elder, St. Pierre, Highwood and Carter.
This includes the following highways...
Interstate 15 between mile markers 308 and 332.
Highway 2 between mile markers 308 and 386.
Highway 87 between mile markers 15 and 111.
If outdoors, consider seeking shelter inside a building.
Torrential rainfall is also occurring with these storms, and may
cause 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.
Some of 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.
To report severe weather, contact your nearest law enforcement
agency. They can relay your report to the National Weather Service
office in Great Falls.
LAT...LON 4871 10950 4759 11026 4762 11105 4768 11099
4769 11142 4790 11200 4835 11169 4822 11166
4822 11128 4900 11125 4900 10949
TIME...MOT...LOC 0005Z 217DEG 11KT 4820 11086
$$
SCThe office that day
Everything else NWS Great Falls, MT issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 2, 6:47 PM MDT | Special Weather Statement | TFX | Chouteau, Hill | 43 min |
| Aug 2, 7:39 PM MDT | Special Weather Statement | TFX | Hill, Liberty | 51 min |
| Aug 2, 7:44 PM MDT | Special Weather Statement | TFX | Broadwater | 46 min |
| Aug 2, 7:47 PM MDT | Special Weather Statement | TFX | Judith Basin | 43 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.