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 8, 2021, 6:45 PM MDT for Gallatin County, Montana. It was in force for 45 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 8, 2021, 6:45 PM MDT (00:45 UTC)
- Expired
- Aug 8, 2021, 7:30 PM MDT
- In force
- 45 min
- Issued by
- NWS Great Falls, MT
- Hail
- 0.00 in
- Wind
- 55
County Gallatin County, MT
The radar
The Billings radar (KBLX), 207 km from the middle of the area, began a volume at 00:47 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, 0.8 hours before the alert went out and 245 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
- 633 m above ground
- 0-6 km bulk shear
- 58 kt
- 0-1 km storm-relative helicity
- 42 m²/s²
- 0-3 km storm-relative helicity
- -108 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
070
WWUS85 KTFX 090045
SPSTFX
Special Weather Statement
National Weather Service Great Falls MT
645 PM MDT Sun Aug 8 2021
MTZ015-055-090130-
Madison MT-Gallatin MT-
645 PM MDT Sun Aug 8 2021
...A strong thunderstorm will impact portions of southeastern Madison
and central Gallatin Counties through 730 PM MDT...
At 644 PM MDT, Doppler radar was tracking a strong thunderstorm 14
miles southeast of Ennis, or 19 miles southeast of Virginia City,
moving northeast at 50 mph.
HAZARD...Wind gusts of 50 to 55 mph.
SOURCE...Radar indicated.
IMPACT...Gusty winds could knock down tree limbs and blow around
unsecured objects.
Locations impacted include...
Ennis, Jeffers, Big Sky and Cameron.
This includes the following highways...
Interstate 90 between mile markers 315 and 320.
Highway 191 between mile markers 31 and 73.
Highway 287 between mile markers 1 and 2 , between mile markers 4
and 9 , and between mile markers 8 and 52.
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.
Persons in campgrounds should consider seeking sturdy shelter until
this storm passes.
&&
LAT...LON 4537 11182 4568 11083 4560 11080 4559 11086
4553 11086 4552 11092 4536 11092 4535 11104
4508 11104 4511 11110 4505 11115 4501 11110
4494 11110 4474 11171
TIME...MOT...LOC 0044Z 234DEG 46KT 4516 11158
MAX HAIL SIZE...0.00 IN
MAX WIND GUST...55 MPH
$$
HARTThe office that day
Everything else NWS Great Falls, MT issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 8, 6:51 PM MDT | Special Weather Statement | TFX | Glacier | 24 min |
| Aug 8, 7:27 PM MDT | Special Weather Statement | TFX | Beaverhead | 48 min |
| Aug 8, 7:51 PM MDT | Special Weather Statement | TFX | Beaverhead | 39 min |
| Aug 8, 8:09 PM MDT | Special Weather Statement | TFX | Silver Bow | 36 min |
| Aug 8, 8:39 PM MDT | Special Weather Statement | TFX | Jefferson | 51 min |
| Aug 8, 9:17 PM MDT | Special Weather Statement | TFX | Gallatin | 28 min |
| Aug 9, 3:47 AM MDT | Areal Flood Advisory | TFX | Glacier, Pondera, Toole | 3 hr |
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.