Alert archive / Montana / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 6, NWS Missoula, MT
NWS Missoula, MT issued this severe thunderstorm warning at Jul 21, 2021, 5:36 PM MDT for Missoula County, Powell County, Montana. It was in force for 24 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
- Jul 21, 2021, 5:36 PM MDT (23:36 UTC)
- Expired
- Jul 21, 2021, 6:00 PM MDT
- In force
- 24 min
- Issued by
- NWS Missoula, MT
- Area
- Storm-based polygon
- Hail
- 1.0 in
- Wind
- 60.0 mph
Counties Missoula County, MT, Powell County, MT
The radar
The Missoula radar (KMSX), 38 km from the middle of the area, began a volume at 23:40 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 |
|---|---|---|---|
| Jul 21, 5:45 PM MDT | HAIL 1 | Clearwater, MT | QUARTER-SIZED HAIL FELL FOR 3-5 MINUTES. |
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 12:00Z, 11.6 hours before the alert went out and 225 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
- 158 J/kg
- Mixed-layer CIN
- -180 J/kg
- Mixed-layer LCL
- 1952 m above ground
- 0-6 km bulk shear
- 23 kt
- 0-1 km storm-relative helicity
- 27 m²/s²
- 0-3 km storm-relative helicity
- 33 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
293
WUUS55 KMSO 212336
SVRMSO
MTC063-077-220000-
/O.NEW.KMSO.SV.W.0006.210721T2336Z-210722T0000Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Missoula MT
536 PM MDT Wed Jul 21 2021
The National Weather Service in Missoula has issued a
* Severe Thunderstorm Warning for...
East central Missoula County in west central Montana...
Northwestern Powell County in west central Montana...
* Until 600 PM MDT.
* At 536 PM MDT, a severe thunderstorm was located 14 miles south of
Seeley Lake, or 24 miles east of Missoula, moving northeast at 20
mph near Highway 200.
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...
Greenough and Clearwater.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 4686 11350 4695 11365 4713 11355 4705 11327
TIME...MOT...LOC 2336Z 209DEG 16KT 4695 11351
HAIL...1.00IN
WIND...60MPH
$$2 follow-up statements
140
WWUS55 KMSO 212348
SVSMSO
Severe Weather Statement
National Weather Service Missoula MT
548 PM MDT Wed Jul 21 2021
MTC063-077-220000-
/O.CON.KMSO.SV.W.0006.000000T0000Z-210722T0000Z/
Missoula MT-Powell MT-
548 PM MDT Wed Jul 21 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 600 PM MDT
FOR EASTERN MISSOULA AND NORTHWESTERN POWELL COUNTIES...
At 548 PM MDT, a severe thunderstorm was located 11 miles south of
Seeley Lake, or 27 miles northwest of Drummond, moving northeast at
20 mph.
HAZARD...60 mph wind gusts and quarter size hail.
SOURCE...Radar indicated.
IMPACT...Hail damage to vehicles is expected. Expect wind damage to
roofs, siding, and trees.
Locations impacted include...
Greenough and Clearwater.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 4691 11344 4704 11357 4713 11355 4705 11327
TIME...MOT...LOC 2348Z 209DEG 16KT 4700 11347
HAIL...1.00IN
WIND...60MPH
$$674
WWUS55 KMSO 212350
SVSMSO
Severe Weather Statement
National Weather Service Missoula MT
550 PM MDT Wed Jul 21 2021
MTC063-077-220000-
/O.EXP.KMSO.SV.W.0006.000000T0000Z-210722T0000Z/
Missoula MT-Powell MT-
550 PM MDT Wed Jul 21 2021
...THE SEVERE THUNDERSTORM WARNING FOR EASTERN MISSOULA AND
NORTHWESTERN POWELL COUNTIES WILL EXPIRE AT 600 PM MDT...
The severe thunderstorm which prompted the warning hasweakened.
moved out of the warned area. Therefore, the warning will be allowed
to expire.
LAT...LON 4691 11344 4704 11357 4713 11355 4705 11327
TIME...MOT...LOC 2350Z 209DEG 16KT 4698 11349
$$The office that day
Everything else NWS Missoula, MT issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 21, 12:17 PM MDT | Fire Weather Watch | MSO | Beaverhead, Deer Lodge, Granite, Jefferson, Madison, Powell and 1 more | 25 hr |
| Jul 21, 12:17 PM MDT | Red Flag Warning | MSO | Flathead, Glacier, Lake, Missoula, Powell, Sanders | 33 hr |
| Jul 21, 2:44 PM MDT | Special Weather Statement | MSO | Ravalli | 31 min |
| Jul 21, 2:57 PM MDT | Special Weather Statement | MSO | 33 min | |
| Jul 21, 3:49 PM MDT | Special Weather Statement | MSO | Ravalli | 26 min |
| Jul 21, 3:51 PM MDT | Special Weather Statement | MSO | Powell | 24 min |
| Jul 21, 4:15 PM MDT | Special Weather Statement | MSO | Silver Bow | 15 min |
| Jul 21, 4:40 PM MDT | Special Weather Statement | MSO | Granite | 35 min |
| Jul 21, 4:53 PM MDT | Special Weather Statement | MSO | Missoula | 37 min |
| Jul 21, 5:06 PM MDT | Special Weather Statement | MSO | Missoula | 24 min |
| Jul 21, 5:12 PM MDT | Severe Thunderstorm Warning | MSO | Missoula | 19 min |
| Jul 21, 5:33 PM MDT | Special Weather Statement | MSO | Missoula | 27 min |
| Jul 21, 5:43 PM MDT | Special Weather Statement | MSO | Deer Lodge | 17 min |
| Jul 21, 5:44 PM MDT | Special Weather Statement | MSO | Missoula | 16 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.