Alert archive / Montana / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 59, NWS Great Falls, MT
NWS Great Falls, MT issued this severe thunderstorm warning at Aug 5, 2021, 6:24 PM MDT for Lewis and Clark County, Montana. It was in force for 36 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 5, 2021, 6:24 PM MDT (00:24 UTC)
- Expired
- Aug 5, 2021, 7:00 PM MDT
- In force
- 36 min
- Issued by
- NWS Great Falls, MT
- Area
- Storm-based polygon
- Hail
- 1.0 in
- Wind
- 60.0 mph
County Lewis and Clark County, MT
The radar
The Great Falls radar (KTFX), 74 km from the middle of the area, began a volume at 00:24 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, 0.4 hours before the alert went out and 123 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
- 49 J/kg
- Mixed-layer CIN
- -233 J/kg
- Mixed-layer LCL
- 3223 m above ground
- 0-6 km bulk shear
- 31 kt
- 0-1 km storm-relative helicity
- 48 m²/s²
- 0-3 km storm-relative helicity
- 99 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- -0.0
The text
As transmitted.
614
WUUS55 KTFX 060024
SVRTFX
MTC049-060100-
/O.NEW.KTFX.SV.W.0059.210806T0024Z-210806T0100Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Great Falls MT
624 PM MDT Thu Aug 5 2021
The National Weather Service in Great Falls has issued a
* Severe Thunderstorm Warning for...
East central Lewis and Clark County in west central Montana...
* Until 700 PM MDT.
* At 623 PM MDT, a severe thunderstorm was located over Wolf Creek,
or 27 miles southwest of Cascade, moving northeast at 10 mph.
HAZARD...60 mph wind gusts and quarter size hail.
SOURCE...Radar indicated.
IMPACT...Hail damage to vehicles is expected. Expect wind damage
to roofs, siding, and trees.
* Locations impacted include...
Wolf Creek and Craig.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 4692 11211 4698 11223 4716 11217 4703 11182
TIME...MOT...LOC 0023Z 209DEG 10KT 4700 11213
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
CMCThe office that day
Everything else NWS Great Falls, MT issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 5, 6:16 PM MDT | Special Weather Statement | TFX | Lewis and Clark, Meagher | 29 min |
| Aug 5, 6:47 PM MDT | Special Weather Statement | TFX | Cascade, Judith Basin, Meagher, Teton | 58 min |
| Aug 5, 7:31 PM MDT | Special Weather Statement | TFX | Beaverhead | 29 min |
| Aug 5, 8:15 PM MDT | Special Weather Statement | TFX | 30 min | |
| Aug 5, 9:34 PM MDT | Special Weather Statement | TFX | Beaverhead | 26 min |
| Aug 6, 1:01 PM MDT | Special Weather Statement | TFX | Beaverhead | 59 min |
| Aug 6, 1:40 PM MDT | Special Weather Statement | TFX | Beaverhead | 65 min |
| Aug 6, 2:21 PM MDT | Fire Weather Watch | TFX | Broadwater, Gallatin, Jefferson, Lewis and Clark, Meagher | 20 hr |
| Aug 6, 3:19 PM MDT | Special Weather Statement | TFX | Judith Basin | 26 min |
| Aug 6, 3:37 PM MDT | Special Weather Statement | TFX | Cascade | 53 min |
| Aug 6, 3:48 PM MDT | Special Weather Statement | TFX | 27 min | |
| Aug 6, 4:10 PM MDT | Special Weather Statement | TFX | 65 min | |
| Aug 6, 4:25 PM MDT | Special Weather Statement | TFX | Fergus | 35 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.