Alert archive / Montana / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 5, NWS Missoula, MT
NWS Missoula, MT issued this severe thunderstorm warning at Jul 21, 2021, 5:12 PM MDT for Missoula County, Montana. It was in force for 19 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, 5:12 PM MDT (23:12 UTC)
- Expired
- Jul 21, 2021, 5:31 PM MDT
- In force
- 19 min
- Issued by
- NWS Missoula, MT
- Area
- Storm-based polygon
- Hail
- 1.0 in
- Wind
- 60.0 mph
County Missoula County, MT
The radar
The Missoula radar (KMSX), 31 km from the middle of the area, began a volume at 23:12 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, 5:28 PM MDT | HAIL 1 | 1 Nw Potomac, 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 12:00Z, 11.2 hours before the alert went out and 245 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.
042
WUUS55 KMSO 212312
SVRMSO
MTC063-212345-
/O.NEW.KMSO.SV.W.0005.210721T2312Z-210721T2345Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Missoula MT
512 PM MDT Wed Jul 21 2021
The National Weather Service in Missoula has issued a
* Severe Thunderstorm Warning for...
Southeastern Missoula County in west central Montana...
* Until 545 PM MDT.
* At 512 PM MDT, a severe thunderstorm was located 7 miles east of
Bonner-West Riverside, or 14 miles east of Missoula, 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...
Twin Creeks and Clinton.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 4677 11372 4681 11382 4695 11373 4689 11358
TIME...MOT...LOC 2312Z 209DEG 17KT 4686 11372
HAIL...1.00IN
WIND...60MPH
$$2 follow-up statements
138
WWUS55 KMSO 212328
SVSMSO
Severe Weather Statement
National Weather Service Missoula MT
528 PM MDT Wed Jul 21 2021
MTC063-212345-
/O.CON.KMSO.SV.W.0005.000000T0000Z-210721T2345Z/
Missoula MT-
528 PM MDT Wed Jul 21 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 545 PM MDT
FOR SOUTHEASTERN MISSOULA COUNTY...
At 527 PM MDT, a severe thunderstorm was located 10 miles east of
Bonner-West Riverside, or 17 miles east of Missoula, moving northeast
at 20 mph.
HAZARD...60 mph wind gusts and quarter size hail, are still possible
along highway 200 between Twin Peaks and Potomac.
SOURCE...Radar indicated.
IMPACT...Hail damage to vehicles is expected. Expect wind damage to
roofs, siding, and trees.
Locations impacted include...
Twin Creeks.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 4684 11364 4688 11377 4695 11373 4689 11358
TIME...MOT...LOC 2327Z 209DEG 17KT 4692 11367
HAIL...1.00IN
WIND...60MPH
$$673
WWUS55 KMSO 212331
SVSMSO
Severe Weather Statement
National Weather Service Missoula MT
531 PM MDT Wed Jul 21 2021
MTC063-212341-
/O.CAN.KMSO.SV.W.0005.000000T0000Z-210721T2345Z/
Missoula MT-
531 PM MDT Wed Jul 21 2021
...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN MISSOULA COUNTY
IS CANCELLED...
The severe thunderstorm which prompted the warning has weakened.
moved out of the warned area. Therefore, the warning has been
cancelled.
LAT...LON 4684 11364 4688 11377 4695 11373 4689 11358
TIME...MOT...LOC 2324Z 209DEG 17KT 4694 11365
$$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, 5:33 PM MDT | Special Weather Statement | MSO | Missoula | 27 min |
| Jul 21, 5:36 PM MDT | Severe Thunderstorm Warning | MSO | Missoula, Powell | 24 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.