Alert archive / Montana / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 7, NWS Missoula, MT
NWS Missoula, MT issued this severe thunderstorm warning at Jul 21, 2021, 6:01 PM MDT for Missoula County, Powell County, Montana. It was in force for 29 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, 6:01 PM MDT (00:01 UTC)
- Expired
- Jul 21, 2021, 6:30 PM MDT
- In force
- 29 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), 51 km from the middle of the area, began a volume at 00:05 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, 6:07 PM MDT | HAIL 1 | 6 Nnw Woodworth, MT | HAILED FOR 20-30 MINUTES, MAX SIZE OF 1 INCH. GUSTY WINDS AROUND 40MPH, HEAVY RAIN. |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The nearest sounding before it
Spokane, WA (KOTX), launched 00:00Z, 0.0 hours before the alert went out and 236 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
- 2525 m above ground
- 0-6 km bulk shear
- 55 kt
- 0-1 km storm-relative helicity
- 34 m²/s²
- 0-3 km storm-relative helicity
- 79 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
798
WUUS55 KMSO 220001
SVRMSO
MTC063-077-220030-
/O.NEW.KMSO.SV.W.0007.210722T0001Z-210722T0030Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Missoula MT
601 PM MDT Wed Jul 21 2021
The National Weather Service in Missoula has issued a
* Severe Thunderstorm Warning for...
Northeastern Missoula County in west central Montana...
West central Powell County in west central Montana...
* Until 630 PM MDT.
* At 601 PM MDT, a severe thunderstorm was located near Seeley Lake,
or 37 miles north 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...
Seeley Lake.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 4711 11337 4716 11346 4733 11340 4722 11316
TIME...MOT...LOC 0001Z 209DEG 16KT 4719 11334
HAIL...1.00IN
WIND...60MPH
$$2 follow-up statements
634
WWUS55 KMSO 220007
SVSMSO
Severe Weather Statement
National Weather Service Missoula MT
607 PM MDT Wed Jul 21 2021
MTC063-077-220030-
/O.CON.KMSO.SV.W.0007.000000T0000Z-210722T0030Z/
Missoula MT-Powell MT-
607 PM MDT Wed Jul 21 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 630 PM MDT
FOR NORTHEASTERN MISSOULA AND WEST CENTRAL POWELL COUNTIES...
At 606 PM MDT, a severe thunderstorm was located 7 miles northeast of
Seeley Lake, or 38 miles north of Drummond, moving northeast at 20
mph.
HAZARD...Ping pong ball size hail and 60 mph wind gusts.
SOURCE...Radar indicated.
IMPACT...People and animals outdoors will be injured. Expect hail
damage to roofs, siding, windows, and vehicles. Expect wind
damage to roofs, siding, and trees.
This severe thunderstorm will remain over mainly rural areas of
northeastern Missoula and west central Powell Counties.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 4713 11333 4717 11343 4733 11340 4722 11316
TIME...MOT...LOC 0006Z 209DEG 16KT 4721 11332
HAIL...1.50IN
WIND...60MPH
$$496
WWUS55 KMSO 220020
SVSMSO
Severe Weather Statement
National Weather Service Missoula MT
620 PM MDT Wed Jul 21 2021
MTC063-077-220030-
/O.EXP.KMSO.SV.W.0007.000000T0000Z-210722T0030Z/
Missoula MT-Powell MT-
620 PM MDT Wed Jul 21 2021
...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN MISSOULA AND WEST
CENTRAL POWELL COUNTIES WILL EXPIRE AT 630 PM MDT...
The severe thunderstorm which prompted the warning has weakened.
moved out of the warned area. Therefore, the warning will be allowed
to expire.
LAT...LON 4713 11333 4717 11343 4733 11340 4722 11316
TIME...MOT...LOC 0020Z 209DEG 16KT 4721 11332
$$The office that day
Everything else NWS Missoula, MT issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 21, 6:38 PM MDT | Special Weather Statement | MSO | Granite | 22 min |
| Jul 21, 6:54 PM MDT | Severe Thunderstorm Warning | MSO | Granite, Missoula, Powell | 36 min |
| Jul 21, 7:20 PM MDT | Special Weather Statement | MSO | Granite | 25 min |
| Jul 21, 7:30 PM MDT | Severe Thunderstorm Warning | MSO | Granite, Missoula, Powell | 30 min |
| Jul 21, 7:51 PM MDT | Special Weather Statement | MSO | Powell | 9 min |
| Jul 21, 8:02 PM MDT | Special Weather Statement | MSO | Powell | 28 min |
| Jul 21, 9:04 PM MDT | Special Weather Statement | MSO | Granite | 41 min |
| Jul 21, 9:18 PM MDT | Severe Thunderstorm Warning | MSO | Granite | 27 min |
| Jul 21, 10:12 PM MDT | Special Weather Statement | MSO | Powell | 48 min |
| Jul 22, 1:32 PM MDT | Red Flag Warning | MSO | Beaverhead, Deer Lodge, Granite, Jefferson, Madison, Powell and 1 more | 31 hr |
| Jul 22, 1:59 PM MDT | Special Weather Statement | MSO | 46 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.