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 30, 2021, 11:52 PM MDT for Blaine County, Montana. It was in force for 23 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 30, 2021, 11:52 PM MDT (05:52 UTC)
- Expired
- Aug 31, 2021, 12:15 AM MDT
- In force
- 23 min
- Issued by
- NWS Great Falls, MT
- Hail
- 0.00 in
- Wind
- 30
County Blaine County, MT
The radar
The Great Falls radar (KTFX), 178 km from the middle of the area, began a volume at 05:56 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, 5.9 hours before the alert went out and 139 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
- 111 J/kg
- Mixed-layer CIN
- -83 J/kg
- Mixed-layer LCL
- 3427 m above ground
- 0-6 km bulk shear
- 43 kt
- 0-1 km storm-relative helicity
- 84 m²/s²
- 0-3 km storm-relative helicity
- 179 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- -0.0
The text
As transmitted.
536
WWUS85 KTFX 310552
SPSTFX
Special Weather Statement
National Weather Service Great Falls MT
1152 PM MDT Mon Aug 30 2021
MTZ011-047-310615-
Hill MT-Blaine MT-
1152 PM MDT Mon Aug 30 2021
...A thunderstorm will impact portions of northwestern Blaine and
east central Hill Counties through 1215 AM MDT...
At 1151 PM MDT, Doppler radar was tracking a thunderstorm near
Havre, moving northeast at 45 mph.
HAZARD...Winds in excess of 30 mph and brief heavy rain.
SOURCE...Radar indicated.
IMPACT...Gusty winds could knock down tree limbs and blow around
unsecured objects.
Locations impacted include...
Havre, Chinook and Lohman.
This includes the following highways...
Highway 2 between mile markers 378 and 408.
Highway 87 between mile markers 103 and 111.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
If outdoors, consider seeking shelter inside a building.
&&
LAT...LON 4834 10977 4850 10990 4877 10928 4853 10909
TIME...MOT...LOC 0551Z 242DEG 38KT 4846 10974
MAX HAIL SIZE...0.00 IN
MAX WIND GUST...30 MPH
$$
SCThe office that day
Everything else NWS Great Falls, MT issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 30, 7:19 PM MDT | Special Weather Statement | TFX | Toole | 26 min |
| Aug 30, 7:40 PM MDT | Special Weather Statement | TFX | Cascade, Chouteau, Fergus, Judith Basin, Meagher | 35 min |
| Aug 30, 9:23 PM MDT | Special Weather Statement | TFX | Blaine | 22 min |
| Aug 30, 9:26 PM MDT | Special Weather Statement | TFX | Cascade | 34 min |
| Aug 30, 9:54 PM MDT | Special Weather Statement | TFX | Blaine | 51 min |
| Aug 30, 10:05 PM MDT | Special Weather Statement | TFX | Chouteau | 25 min |
| Aug 30, 10:12 PM MDT | Special Weather Statement | TFX | Cascade | 33 min |
| Aug 30, 10:51 PM MDT | Special Weather Statement | TFX | Blaine | 39 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.