Alert archive / Montana / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 36, NWS Great Falls, MT
NWS Great Falls, MT issued this severe thunderstorm warning at Jul 7, 2021, 6:10 PM MDT for Fergus County, Judith Basin County, Montana. It was in force for 35 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
- Jul 7, 2021, 6:10 PM MDT (00:10 UTC)
- Expired
- Jul 7, 2021, 6:45 PM MDT
- In force
- 35 min
- Issued by
- NWS Great Falls, MT
- Area
- Storm-based polygon
- Hail
- 1.0 in
- Wind
- 60.0 mph
Counties Fergus County, MT, Judith Basin County, MT
The radar
The Great Falls radar (KTFX), 148 km from the middle of the area, began a volume at 00:10 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 watch it was issued in
The SPC watch in force over the same counties when this warning went out.
| Issued | Product | Office | Lasted |
|---|---|---|---|
| Jul 7, 3:03 PM MDT | Severe Thunderstorm Watch | SPC | 8 hr |
The nearest sounding before it
Great_falls, MT (KTFX), launched 00:00Z, 0.2 hours before the alert went out and 92 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
- 17 J/kg
- Mixed-layer CIN
- -372 J/kg
- Mixed-layer LCL
- 2303 m above ground
- 0-6 km bulk shear
- 62 kt
- 0-1 km storm-relative helicity
- 301 m²/s²
- 0-3 km storm-relative helicity
- 511 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
665
WUUS55 KTFX 080010
SVRTFX
MTC027-045-080045-
/O.NEW.KTFX.SV.W.0036.210708T0010Z-210708T0045Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Great Falls MT
610 PM MDT Wed Jul 7 2021
The National Weather Service in Great Falls has issued a
* Severe Thunderstorm Warning for...
East central Judith Basin County in central Montana...
Central Fergus County in central Montana...
* Until 645 PM MDT.
* At 608 PM MDT, severe thunderstorms were located along a line
extending from 9 miles northwest of Lewistown to near Hobson,
moving east at 25 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...
Lewistown, Hobson, Moore, Moccasin, Giltedge, Ackley Lake State
Park and Glengarry.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
To report severe weather, contact your nearest law enforcement
agency. They will send your report to the National Weather Service
office in Great Falls.
&&
LAT...LON 4724 10888 4690 10967 4696 11000 4703 11001
4722 10955
TIME...MOT...LOC 0008Z 270DEG 16KT 4718 10953 4701 10994
HAIL...1.00IN
WIND...60MPH
$$
Kredensor2 follow-up statements
033
WWUS55 KTFX 080031
SVSTFX
Severe Weather Statement
National Weather Service Great Falls MT
631 PM MDT Wed Jul 7 2021
MTC027-045-080045-
/O.CON.KTFX.SV.W.0036.000000T0000Z-210708T0045Z/
Judith Basin MT-Fergus MT-
631 PM MDT Wed Jul 7 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 645 PM MDT
FOR EAST CENTRAL JUDITH BASIN AND SOUTH CENTRAL FERGUS COUNTIES...
At 631 PM MDT, severe thunderstorms were located along a line
extending from 8 miles north of Lewistown to near Hobson, moving east
at 25 mph.
HAZARD...60 mph wind gusts and penny size hail.
SOURCE...Radar indicated.
IMPACT...Expect damage to roofs, siding, and trees.
Locations impacted include...
Lewistown, Hobson, Moore, Giltedge and Glengarry.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
To report severe weather contact your nearest law enforcement agency.
They will send your report to the National Weather Service office in
Great Falls.
&&
LAT...LON 4724 10890 4691 10967 4697 11000 4722 10944
4724 10898
TIME...MOT...LOC 0031Z 270DEG 16KT 4718 10939 4701 10980
HAIL...0.75IN
WIND...60MPH
$$
Kredensor770
WWUS55 KTFX 080045
SVSTFX
Severe Weather Statement
National Weather Service Great Falls MT
645 PM MDT Wed Jul 7 2021
MTC027-045-080055-
/O.EXP.KTFX.SV.W.0036.000000T0000Z-210708T0045Z/
Judith Basin MT-Fergus MT-
645 PM MDT Wed Jul 7 2021
...THE SEVERE THUNDERSTORM WARNING FOR EAST CENTRAL JUDITH BASIN AND
SOUTH CENTRAL FERGUS COUNTIES HAS EXPIRED...
The storms which prompted the warning have weakened below severe
limits, and no longer pose an immediate threat to life or property.
Therefore, the warning has been allowed to expire. However gusty
winds are still possible with these thunderstorms.
A Severe Thunderstorm Watch remains in effect until 1100 PM MDT for
central Montana.
To report severe weather, contact your nearest law enforcement
agency. They will relay your report to the National Weather Service
Great Falls.
LAT...LON 4724 10890 4691 10967 4697 11000 4722 10944
4724 10898
TIME...MOT...LOC 0045Z 270DEG 16KT 4718 10930 4701 10971
$$
KredensorThe office that day
Everything else NWS Great Falls, MT issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 7, 6:36 PM MDT | Special Weather Statement | TFX | 24 min | |
| Jul 7, 6:56 PM MDT | Special Weather Statement | TFX | Petroleum | 34 min |
| Jul 7, 8:02 PM MDT | Special Weather Statement | TFX | Glacier | 28 min |
| Jul 7, 8:48 PM MDT | Special Weather Statement | TFX | Glacier | 27 min |
| Jul 7, 9:33 PM MDT | Special Weather Statement | TFX | Glacier | 27 min |
| Jul 8, 11:48 AM MDT | Special Weather Statement | TFX | Blaine | 42 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.