Alert archive / Montana / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 2, NWS Great Falls, MT
NWS Great Falls, MT issued this severe thunderstorm warning at Jun 4, 2021, 9:30 PM MDT for Gallatin County, Montana. It was in force for 33 min. 2 reports 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 4, 2021, 9:30 PM MDT (03:30 UTC)
- Expired
- Jun 4, 2021, 10:03 PM MDT
- In force
- 33 min
- Issued by
- NWS Great Falls, MT
- Area
- Storm-based polygon
- Hail
- 1.25 in
- Wind
- 60.0 mph
County Gallatin County, MT
The radar
The Great Falls radar (KTFX), 175 km from the middle of the area, began a volume at 03:32 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 4, 9:30 PM MDT | HAIL 0.5 | 7 Ene Manhattan, MT | HALF INCH HAIL REPORTED. |
| Jun 4, 9:42 PM MDT | HAIL 0.25 | 9 Ne Belgrade, MT |
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 00:00Z, 3.5 hours before the alert went out and 178 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
- 460 J/kg
- Mixed-layer CIN
- -28 J/kg
- Mixed-layer LCL
- 2772 m above ground
- 0-6 km bulk shear
- 23 kt
- 0-1 km storm-relative helicity
- 10 m²/s²
- 0-3 km storm-relative helicity
- 121 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 1.2
The text
As transmitted.
848
WUUS55 KTFX 050330
SVRTFX
MTC031-050415-
/O.NEW.KTFX.SV.W.0002.210605T0330Z-210605T0415Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Great Falls MT
930 PM MDT Fri Jun 4 2021
The National Weather Service in Great Falls has issued a
* Severe Thunderstorm Warning for...
Northeastern Gallatin County in south central Montana...
* Until 1015 PM MDT.
* At 930 PM MDT, a severe thunderstorm was located near Belgrade, or
14 miles northwest of Bozeman, 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...
Belgrade.
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 4591 11133 4609 11079 4582 11079 4574 11125
TIME...MOT...LOC 0330Z 250DEG 31KT 4586 11119
HAIL...1.25IN
WIND...60MPH
$$
Kredensor2 follow-up statements
011 WWUS55 KTFX 050348 SVSTFX Severe Weather Statement National Weather Service Great Falls MT 948 PM MDT Fri Jun 4 2021 MTC031-050415- /O.CON.KTFX.SV.W.0002.000000T0000Z-210605T0415Z/ Gallatin MT- 948 PM MDT Fri Jun 4 2021 ...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1015 PM MDT FOR NORTHEASTERN GALLATIN COUNTY... At 947 PM MDT, a severe thunderstorm was located 13 miles northeast of Belgrade, or 16 miles north of Bozeman, moving east at 35 mph. HAZARD...60 mph wind gusts and nickel size hail. SOURCE...Radar indicated. IMPACT...Expect damage to roofs, siding, and trees. This severe thunderstorm will remain over mainly rural areas of northeastern Gallatin County. PRECAUTIONARY/PREPAREDNESS ACTIONS... For your protection move to an interior room on the lowest floor of a building. To report severe weather contact your nearest law enforcement agency. They will send your report to the National Weather Service office in Great Falls. && LAT...LON 4579 11105 4596 11114 4608 11079 4584 11079 TIME...MOT...LOC 0347Z 250DEG 31KT 4591 11098 HAIL...0.88IN WIND...60MPH $$ Kredensor
798
WWUS55 KTFX 050403
SVSTFX
Severe Weather Statement
National Weather Service Great Falls MT
1003 PM MDT Fri Jun 4 2021
MTC031-050413-
/O.CAN.KTFX.SV.W.0002.000000T0000Z-210605T0415Z/
Gallatin MT-
1003 PM MDT Fri Jun 4 2021
...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN GALLATIN COUNTY
IS CANCELLED...
The storm which prompted the warning has weakened below severe
limits, and has exited the warned area. Therefore, the warning has
been cancelled.
LAT...LON 4579 11105 4596 11114 4608 11079 4584 11079
TIME...MOT...LOC 0401Z 250DEG 31KT 4596 11079
$$
KredensorThe office that day
Everything else NWS Great Falls, MT issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 4, 7:41 PM MDT | Special Weather Statement | TFX | Blaine | 34 min |
| Jun 4, 9:22 PM MDT | Special Weather Statement | TFX | Fergus | 53 min |
| Jun 4, 9:36 PM MDT | Special Weather Statement | TFX | Gallatin | 24 min |
| Jun 4, 9:45 PM MDT | Severe Thunderstorm Warning | TFX | Fergus | 45 min |
| Jun 4, 10:45 PM MDT | Special Weather Statement | TFX | Fergus | 45 min |
| Jun 5, 1:18 PM MDT | Special Weather Statement | TFX | Madison | 27 min |
| Jun 5, 5:08 PM MDT | Special Weather Statement | TFX | Judith Basin | 37 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.