Alert archive / Montana / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 4, NWS Missoula, MT
NWS Missoula, MT issued this severe thunderstorm warning at Jul 7, 2021, 7:48 PM MDT for Flathead County, Montana. It was in force for 27 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, 7:48 PM MDT (01:48 UTC)
- Expired
- Jul 7, 2021, 8:15 PM MDT
- In force
- 27 min
- Issued by
- NWS Missoula, MT
- Area
- Storm-based polygon
- Hail
- 1.0 in
- Wind
- 60.0 mph
County Flathead County, MT
The radar
The Missoula radar (KMSX), 200 km from the middle of the area, began a volume at 01:50 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.
The nearest sounding before it
Spokane, WA (KOTX), launched 00:00Z, 1.8 hours before the alert went out and 221 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
- -17 J/kg
- Mixed-layer LCL
- 3130 m above ground
- 0-6 km bulk shear
- 38 kt
- 0-1 km storm-relative helicity
- -22 m²/s²
- 0-3 km storm-relative helicity
- 1 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
128
WUUS55 KMSO 080148
SVRMSO
MTC029-080215-
/O.NEW.KMSO.SV.W.0004.210708T0148Z-210708T0215Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Missoula MT
748 PM MDT Wed Jul 7 2021
The National Weather Service in Missoula has issued a
* Severe Thunderstorm Warning for...
North central Flathead County in northwestern Montana...
* Until 815 PM MDT.
* At 748 PM MDT, a severe thunderstorm was located 21 miles northwest
of West Glacier, or 38 miles north of Evergreen, moving northeast
at 35 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
north central Flathead County.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 4894 11404 4891 11401 4889 11406 4885 11399
4883 11400 4882 11395 4885 11391 4884 11388
4885 11385 4884 11381 4885 11379 4881 11376
4879 11377 4872 11370 4865 11417 4883 11434
4896 11403
TIME...MOT...LOC 0148Z 236DEG 29KT 4878 11419
HAIL...1.00IN
WIND...60MPH
$$3 follow-up statements
376
WWUS55 KMSO 080157
SVSMSO
Severe Weather Statement
National Weather Service Missoula MT
757 PM MDT Wed Jul 7 2021
MTC029-080215-
/O.CON.KMSO.SV.W.0004.000000T0000Z-210708T0215Z/
Flathead MT-
757 PM MDT Wed Jul 7 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 815 PM MDT
FOR NORTH CENTRAL FLATHEAD COUNTY...
At 756 PM MDT, a severe thunderstorm was located 22 miles north of
West Glacier, or 41 miles north of Evergreen, moving northeast at 35
mph.
HAZARD...60 mph wind gusts and penny size hail.
SOURCE...Radar indicated.
IMPACT...Expect damage to roofs, siding, and trees.
This severe thunderstorm will remain over mainly rural areas of north
central Flathead County.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 4894 11404 4891 11401 4889 11406 4885 11399
4883 11400 4882 11395 4885 11391 4884 11388
4885 11385 4884 11381 4885 11379 4881 11376
4879 11377 4872 11370 4867 11406 4883 11423
4896 11403
TIME...MOT...LOC 0156Z 236DEG 29KT 4882 11410
HAIL...0.75IN
WIND...60MPH
$$163
WWUS55 KMSO 080206
SVSMSO
Severe Weather Statement
National Weather Service Missoula MT
806 PM MDT Wed Jul 7 2021
MTC029-080215-
/O.CON.KMSO.SV.W.0004.000000T0000Z-210708T0215Z/
Flathead MT-
806 PM MDT Wed Jul 7 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 815 PM MDT
FOR NORTH CENTRAL FLATHEAD COUNTY...
At 806 PM MDT, a severe thunderstorm was located 25 miles north of
West Glacier, or 45 miles north of Evergreen, moving northeast at 35
mph.
HAZARD...60 mph wind gusts.
SOURCE...Radar indicated.
IMPACT...Expect damage to roofs, siding, and trees.
This severe thunderstorm will remain over mainly rural areas of north
central Flathead County.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 4885 11391 4884 11388 4885 11385 4884 11381
4885 11379 4881 11376 4879 11377 4872 11370
4868 11400 4876 11408 4882 11395
TIME...MOT...LOC 0206Z 236DEG 29KT 4887 11400
HAIL...<.75IN
WIND...60MPH
$$138
WWUS55 KMSO 080211
SVSMSO
Severe Weather Statement
National Weather Service Missoula MT
811 PM MDT Wed Jul 7 2021
MTC029-080221-
/O.EXP.KMSO.SV.W.0004.000000T0000Z-210708T0215Z/
Flathead MT-
811 PM MDT Wed Jul 7 2021
...THE SEVERE THUNDERSTORM WARNING FOR NORTH CENTRAL FLATHEAD COUNTY
WILL EXPIRE AT 815 PM MDT...
The storm which prompted the warning has weakened below severe
limits, and no longer poses an immediate threat to life or property.
Therefore, the warning will be allowed to expire. However gusty
winds and heavy rain are still possible with this thunderstorm.
LAT...LON 4885 11391 4884 11388 4885 11385 4884 11381
4885 11379 4881 11376 4879 11377 4872 11370
4868 11400 4876 11408 4882 11395
TIME...MOT...LOC 0211Z 236DEG 29KT 4887 11400
$$The office that day
Everything else NWS Missoula, MT issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 7, 7:41 PM MDT | Special Weather Statement | MSO | Flathead | 34 min |
| Jul 8, 7:08 AM MDT | Red Flag Warning | MSO | Beaverhead, Deer Lodge, Granite, Jefferson, Madison, Powell and 1 more | 14 hr |
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.