Alert archive / Montana / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 17, NWS Great Falls, MT
NWS Great Falls, MT issued this severe thunderstorm warning at Jun 24, 2021, 5:29 PM MDT for Fergus County, Montana. It was in force for 31 min. 1 report came from inside the area while it was in force.
The area
The outline as issued, with what was reported inside it.
The facts
- Issued
- Jun 24, 2021, 5:29 PM MDT (23:29 UTC)
- Expired
- Jun 24, 2021, 6:00 PM MDT
- In force
- 31 min
- Issued by
- NWS Great Falls, MT
- Area
- Storm-based polygon
- Hail
- 1.25 in
- Wind
- 60.0 mph
County Fergus County, MT
The radar
The Billings radar (KBLX), 111 km from the middle of the area, began a volume at 23:31 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.
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Jun 24, 5:35 PM MDT | TSTM WND GST 59 | 13 Sse Forestgrove, MT | AWOS STATION KMVH N BAR RANCH AWOS. TIME ESTIMATED BASED ON RADAR. |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The nearest sounding before it
Great_falls, MT (KTFX), launched 12:00Z, 11.5 hours before the alert went out and 147 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
- 10 J/kg
- Mixed-layer CIN
- -138 J/kg
- Mixed-layer LCL
- 2437 m above ground
- 0-6 km bulk shear
- 20 kt
- 0-1 km storm-relative helicity
- 105 m²/s²
- 0-3 km storm-relative helicity
- 109 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
532
WUUS55 KTFX 242329
SVRTFX
MTC027-250000-
/O.NEW.KTFX.SV.W.0017.210624T2329Z-210625T0000Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Great Falls MT
529 PM MDT Thu Jun 24 2021
The National Weather Service in Great Falls has issued a
* Severe Thunderstorm Warning for...
Southeastern Fergus County in central Montana...
* Until 600 PM MDT.
* At 528 PM MDT, a severe thunderstorm was located 18 miles southeast
of Lewistown, moving east at 35 mph.
HAZARD...60 mph wind gusts and half dollar size hail.
SOURCE...Radar indicated.
IMPACT...Hail damage to vehicles is expected. Expect wind damage
to roofs, siding, and trees.
* Locations impacted include...
Grass Range and Forestgrove.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
To report severe weather, contact your nearest law enforcement
agency. They will send your report to the National Weather Service
office in Great Falls.
Large hail and damaging winds and continuous cloud to ground
lightning is occurring with this storm. Move indoors immediately.
Lightning is one of nature's leading killers. Remember, if you can
hear thunder, you are close enough to be struck by lightning.
&&
LAT...LON 4676 10863 4675 10868 4675 10914 4677 10928
4702 10921 4703 10861
TIME...MOT...LOC 2328Z 278DEG 29KT 4687 10916
HAIL...1.25IN
WIND...60MPH
$$
Ludwig1 follow-up statement
683
WWUS55 KTFX 242348
SVSTFX
Severe Weather Statement
National Weather Service Great Falls MT
548 PM MDT Thu Jun 24 2021
MTC027-250000-
/O.CON.KTFX.SV.W.0017.000000T0000Z-210625T0000Z/
Fergus MT-
548 PM MDT Thu Jun 24 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 600 PM MDT
FOR SOUTHEASTERN FERGUS COUNTY...
At 547 PM MDT, a severe thunderstorm was located 14 miles southwest
of Grass Range, or 26 miles southeast of Lewistown, moving east at 35
mph.
HAZARD...Ping pong ball size hail and 60 mph wind gusts.
SOURCE...Radar indicated.
IMPACT...People and animals outdoors will be injured. Expect hail
damage to roofs, siding, windows, and vehicles. Expect wind
damage to roofs, siding, and trees.
This severe thunderstorm will remain over mainly rural areas of
southeastern Fergus County.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
To report severe weather contact your nearest law enforcement agency.
They will send your report to the National Weather Service office in
Great Falls.
Continuous cloud to ground lightning is occurring with this storm.
Move indoors immediately. Lightning is one of nature's leading
killers. Remember, if you can hear thunder, you are close enough to
be struck by lightning.
&&
LAT...LON 4675 10868 4679 10904 4698 10899 4700 10861
4676 10863
TIME...MOT...LOC 2347Z 278DEG 29KT 4685 10896
HAIL...1.50IN
WIND...60MPH
$$
LudwigThe office that day
Everything else NWS Great Falls, MT issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 24, 2:05 PM MDT | Special Weather Statement | TFX | Cascade | 40 min |
| Jun 24, 3:57 PM MDT | Special Weather Statement | TFX | Teton | 33 min |
| Jun 24, 4:07 PM MDT | Special Weather Statement | TFX | Meagher | 23 min |
| Jun 24, 4:25 PM MDT | Special Weather Statement | TFX | Teton | 35 min |
| Jun 24, 4:29 PM MDT | Severe Thunderstorm Warning | TFX | Fergus, Judith Basin | 31 min |
| Jun 24, 4:55 PM MDT | Severe Thunderstorm Warning | TFX | Fergus, Judith Basin | 35 min |
| Jun 24, 5:16 PM MDT | Special Weather Statement | TFX | Fergus | 44 min |
| Jun 24, 5:59 PM MDT | Severe Thunderstorm Warning | TFX | Fergus | 31 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.