Alert archive / Montana / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 13, NWS Missoula, MT
NWS Missoula, MT issued this severe thunderstorm warning at Aug 5, 2021, 5:03 PM MDT for Powell County, Montana. It was in force for 42 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
- Aug 5, 2021, 5:03 PM MDT (23:03 UTC)
- Expired
- Aug 5, 2021, 5:45 PM MDT
- In force
- 42 min
- Issued by
- NWS Missoula, MT
- Area
- Storm-based polygon
- Hail
- 1.0 in
- Wind
- 60.0 mph
County Powell County, MT
The radar
The Missoula radar (KMSX), 102 km from the middle of the area, began a volume at 23:02 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
Great_falls, MT (KTFX), launched 12:00Z, 11.1 hours before the alert went out and 181 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 1584 m above ground
- 0-6 km bulk shear
- 36 kt
- 0-1 km storm-relative helicity
- 23 m²/s²
- 0-3 km storm-relative helicity
- 142 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
007
WUUS55 KMSO 052303
SVRMSO
MTC077-052345-
/O.NEW.KMSO.SV.W.0013.210805T2303Z-210805T2345Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Missoula MT
503 PM MDT Thu Aug 5 2021
The National Weather Service in Missoula has issued a
* Severe Thunderstorm Warning for...
Southeastern Powell County in west central Montana...
* Until 545 PM MDT.
* At 502 PM MDT, a severe thunderstorm was located 8 miles north of
Garrison, or 17 miles north of Deer Lodge, moving north 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.
* Locations impacted include...
Garrison, Finn, Brock Creek, Goldcreek and Avon.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 4646 11279 4653 11298 4696 11286 4695 11279
4683 11279 4683 11253 4670 11253 4670 11250
TIME...MOT...LOC 2302Z 198DEG 30KT 4664 11277
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$2 follow-up statements
700
WWUS55 KMSO 052316
SVSMSO
Severe Weather Statement
National Weather Service Missoula MT
516 PM MDT Thu Aug 5 2021
MTC077-052345-
/O.CON.KMSO.SV.W.0013.000000T0000Z-210805T2345Z/
Powell MT-
516 PM MDT Thu Aug 5 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 545 PM MDT
FOR SOUTHEASTERN POWELL COUNTY...
At 515 PM MDT, a severe thunderstorm was located 14 miles south of
Lincoln, or 21 miles east of Drummond, moving north at 35 mph.
HAZARD...60 mph wind gusts and quarter size hail.
SOURCE...Radar indicated.
IMPACT...Hail damage to vehicles is expected. Expect wind damage to
roofs, siding, and trees.
Locations impacted include...
Garrison, Finn, Brock Creek, Goldcreek and Avon.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 4646 11279 4653 11298 4696 11286 4695 11279
4683 11279 4683 11253 4670 11253 4670 11250
TIME...MOT...LOC 2315Z 198DEG 30KT 4675 11272
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$566
WWUS55 KMSO 052341
SVSMSO
Severe Weather Statement
National Weather Service Missoula MT
541 PM MDT Thu Aug 5 2021
MTC077-052350-
/O.EXP.KMSO.SV.W.0013.000000T0000Z-210805T2345Z/
Powell MT-
541 PM MDT Thu Aug 5 2021
...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN POWELL COUNTY
WILL EXPIRE AT 545 PM MDT...
The storm which prompted the warning will be moving out of the area
shortly.Therefore, the warning will be allowed to expire. However
small hail and gusty winds are still possible with this thunderstorm.
LAT...LON 4646 11279 4653 11298 4696 11286 4695 11279
4683 11279 4683 11253 4670 11253 4670 11250
TIME...MOT...LOC 2340Z 198DEG 30KT 4692 11264
$$The office that day
Everything else NWS Missoula, MT issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 4, 6:21 PM MDT | Special Weather Statement | MSO | Flathead | 24 min |
| Aug 4, 6:31 PM MDT | Special Weather Statement | MSO | Lake | 14 min |
| Aug 4, 7:57 PM MDT | Special Weather Statement | MSO | Lake | 18 min |
| Aug 4, 8:03 PM MDT | Severe Thunderstorm Warning | MSO | Lake | 27 min |
| Aug 4, 8:26 PM MDT | Severe Thunderstorm Warning | MSO | Lake | 34 min |
| Aug 5, 2:27 PM MDT | Special Weather Statement | MSO | Mineral, Ravalli | 33 min |
| Aug 5, 3:20 PM MDT | Special Weather Statement | MSO | Granite, Ravalli | 55 min |
| Aug 5, 4:12 PM MDT | Special Weather Statement | MSO | Deer Lodge, Silver Bow | 48 min |
| Aug 5, 4:19 PM MDT | Special Weather Statement | MSO | Ravalli | 56 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.