Alert archive / Montana / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 13, NWS Great Falls, MT
NWS Great Falls, MT issued this severe thunderstorm warning at Jun 9, 2021, 10:48 PM MDT for Blaine County, Montana. It was in force for 42 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 9, 2021, 10:48 PM MDT (04:48 UTC)
- Expired
- Jun 9, 2021, 11:30 PM MDT
- In force
- 42 min
- Issued by
- NWS Great Falls, MT
- Area
- Storm-based polygon
- Hail
- 1.75 in
- Wind
- 60.0 mph
County Blaine County, MT
The radar
The Glasgow radar (KGGW), 154 km from the middle of the area, began a volume at 04:50 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 9, 10:55 PM MDT | HAIL 1.5 | Hays, MT | QUARTER TO PING PONG BALL SIZED HAIL REPORTED IN HAYS, MT WITH THE THIRD SYSTEM THAT TRACKED THROUGH THE AREA, GUSTY WINDS THAT SHOOK THE TRUCK, ESTIMATED 50 MPH GUSTS. |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The watch it was issued in
The SPC watch in force over the same counties when this warning went out.
| Issued | Product | Office | Lasted |
|---|---|---|---|
| Jun 9, 6:42 PM MDT | Severe Thunderstorm Watch | SPC | 5 hr |
The nearest sounding before it
Great_falls, MT (KTFX), launched 00:00Z, 4.8 hours before the alert went out and 156 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
- 22 J/kg
- Mixed-layer CIN
- -195 J/kg
- Mixed-layer LCL
- 1287 m above ground
- 0-6 km bulk shear
- 71 kt
- 0-1 km storm-relative helicity
- 12 m²/s²
- 0-3 km storm-relative helicity
- 408 m²/s²
- Significant tornado parameter
- -0.0
- Supercell composite
- -0.1
The text
As transmitted.
005
WUUS55 KTFX 100448
SVRTFX
MTC005-100530-
/O.NEW.KTFX.SV.W.0013.210610T0448Z-210610T0530Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Great Falls MT
1048 PM MDT Wed Jun 9 2021
The National Weather Service in Great Falls has issued a
* Severe Thunderstorm Warning for...
Southeastern Blaine County in north central Montana...
* Until 1130 PM MDT.
* At 1048 PM MDT, a severe thunderstorm was located 7 miles southwest
of Hays, or 12 miles west of Zortman, moving north at 25 mph.
HAZARD...Golf 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.
* Locations impacted include...
Hays and Lodge Pole.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Prepare immediately for large hail and deadly cloud to ground
lightning. Seek shelter inside a well-built structure. Stay away from
windows.
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 4798 10862 4792 10864 4793 10879 4792 10885
4794 10894 4832 10884 4823 10842 4797 10844
TIME...MOT...LOC 0448Z 201DEG 21KT 4794 10879
HAIL...1.75IN
WIND...60MPH
$$
Kredensor3 follow-up statements
195
WWUS55 KTFX 100506
SVSTFX
Severe Weather Statement
National Weather Service Great Falls MT
1106 PM MDT Wed Jun 9 2021
MTC005-100530-
/O.CON.KTFX.SV.W.0013.000000T0000Z-210610T0530Z/
Blaine MT-
1106 PM MDT Wed Jun 9 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1130 PM MDT
FOR SOUTHEASTERN BLAINE COUNTY...
At 1106 PM MDT, a severe thunderstorm was located near Hays, or 13
miles northwest of Zortman, moving north at 30 mph.
HAZARD...Ping pong ball size hail and 60 mph wind gusts.
SOURCE...Radar indicated.
IMPACT...People and animals outdoors will be injured. Expect hail
damage to roofs, siding, windows, and vehicles. Expect wind
damage to roofs, siding, and trees.
Locations impacted include...
Hays.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Prepare immediately for large hail and deadly cloud to ground
lightning. Seek shelter inside a well-built structure. Stay away from
windows.
To report severe weather contact your nearest law enforcement agency.
They will send your report to the National Weather Service office in
Great Falls.
&&
LAT...LON 4793 10864 4799 10892 4811 10890 4832 10884
4823 10844 4798 10858 4798 10862
TIME...MOT...LOC 0506Z 192DEG 25KT 4804 10874
HAIL...1.50IN
WIND...60MPH
$$
Kredensor745
WWUS55 KTFX 100521
SVSTFX
Severe Weather Statement
National Weather Service Great Falls MT
1121 PM MDT Wed Jun 9 2021
MTC005-100530-
/O.CON.KTFX.SV.W.0013.000000T0000Z-210610T0530Z/
Blaine MT-
1121 PM MDT Wed Jun 9 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1130 PM MDT
FOR EAST CENTRAL BLAINE COUNTY...
At 1120 PM MDT, a severe thunderstorm was located 10 miles north of
Hays, or 17 miles northwest of Zortman, moving north at 30 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.
This severe thunderstorm will remain over mainly rural areas of east
central Blaine County.
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 4803 10859 4809 10887 4832 10883 4823 10846
TIME...MOT...LOC 0520Z 193DEG 25KT 4814 10870
HAIL...1.00IN
WIND...60MPH
$$
Kredensor816
WWUS55 KTFX 100535
SVSTFX
Severe Weather Statement
National Weather Service Great Falls MT
1135 PM MDT Wed Jun 9 2021
MTC005-100544-
/O.EXP.KTFX.SV.W.0013.000000T0000Z-210610T0530Z/
Blaine MT-
1135 PM MDT Wed Jun 9 2021
...THE SEVERE THUNDERSTORM WARNING FOR EAST CENTRAL BLAINE COUNTY HAS
EXPIRED...
The severe thunderstorm which prompted the warning has weakened.
Therefore, the warning was allowed to expire. However small hail
and gusty winds are still possible with this thunderstorm.
To report severe weather, contact your nearest law enforcement
agency. They will relay your report to the National Weather Service
Great Falls.
LAT...LON 4803 10859 4809 10887 4832 10883 4823 10846
TIME...MOT...LOC 0534Z 201DEG 21KT 4822 10866
$$
KredensorThe office that day
Everything else NWS Great Falls, MT issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 9, 6:18 PM MDT | Severe Thunderstorm Warning | TFX | Blaine | 42 min |
| Jun 9, 6:55 PM MDT | Severe Thunderstorm Warning | TFX | Blaine | 35 min |
| Jun 9, 7:08 PM MDT | Special Weather Statement | TFX | Fergus | 22 min |
| Jun 9, 7:19 PM MDT | Special Weather Statement | TFX | Teton | 56 min |
| Jun 9, 7:26 PM MDT | Special Weather Statement | TFX | Fergus | 34 min |
| Jun 9, 7:28 PM MDT | Special Weather Statement | TFX | Judith Basin | 32 min |
| Jun 9, 7:36 PM MDT | Special Weather Statement | TFX | Fergus | 24 min |
| Jun 9, 7:53 PM MDT | Severe Thunderstorm Warning | TFX | Chouteau, Fergus | 37 min |
| Jun 9, 7:57 PM MDT | Special Weather Statement | TFX | Hill | 33 min |
| Jun 9, 8:04 PM MDT | Special Weather Statement | TFX | Judith Basin | 26 min |
| Jun 9, 8:19 PM MDT | Special Weather Statement | TFX | Teton | 26 min |
| Jun 9, 8:28 PM MDT | Severe Thunderstorm Warning | TFX | Chouteau, Judith Basin | 32 min |
| Jun 9, 8:31 PM MDT | Special Weather Statement | TFX | Chouteau | 29 min |
| Jun 9, 8:42 PM MDT | Severe Thunderstorm Warning | TFX | Blaine, Fergus | 33 min |
| Jun 9, 8:45 PM MDT | Special Weather Statement | TFX | Petroleum | 30 min |
| Jun 9, 8:48 PM MDT | Special Weather Statement | TFX | Hill | 27 min |
| Jun 9, 8:57 PM MDT | Special Weather Statement | TFX | Blaine | 18 min |
| Jun 9, 9:04 PM MDT | Severe Thunderstorm Warning | TFX | Chouteau, Hill | 26 min |
| Jun 9, 9:09 PM MDT | Severe Thunderstorm Warning | TFX | Blaine, Fergus | 21 min |
| Jun 9, 9:18 PM MDT | Special Weather Statement | TFX | Toole | 42 min |
| Jun 9, 9:26 PM MDT | Special Weather Statement | TFX | Blaine | 49 min |
| Jun 9, 9:30 PM MDT | Severe Thunderstorm Warning | TFX | Blaine | 45 min |
| Jun 9, 9:37 PM MDT | Special Weather Statement | TFX | Blaine | 23 min |
| Jun 9, 9:38 PM MDT | Special Weather Statement | TFX | Fergus | 37 min |
| Jun 9, 9:38 PM MDT | Severe Thunderstorm Warning | TFX | Blaine | 40 min |
| Jun 9, 9:51 PM MDT | Special Weather Statement | TFX | Blaine | 24 min |
| Jun 9, 10:17 PM MDT | Special Weather Statement | TFX | Blaine | 28 min |
| Jun 9, 10:32 PM MDT | Special Weather Statement | TFX | Fergus | 43 min |
| Jun 9, 11:34 PM MDT | Special Weather Statement | TFX | Blaine, Fergus, Hill | 116 min |
| Jun 10, 2:11 AM MDT | Special Weather Statement | TFX | Blaine | 34 min |
| Jun 10, 2:53 PM MDT | Special Weather Statement | TFX | Fergus | 37 min |
| Jun 10, 3:08 PM MDT | Severe Thunderstorm Warning | TFX | Fergus | 52 min |
| Jun 10, 3:53 PM MDT | Special Weather Statement | TFX | Fergus | 37 min |
| Jun 10, 4:22 PM MDT | Special Weather Statement | TFX | Cascade | 23 min |
| Jun 10, 4:56 PM MDT | Special Weather Statement | TFX | Cascade | 34 min |
| Jun 10, 5:33 PM MDT | Special Weather Statement | TFX | Cascade | 27 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.