Alert archive / Montana / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 12, NWS Missoula, MT
NWS Missoula, MT issued this severe thunderstorm warning at Aug 4, 2021, 8:26 PM MDT for Lake County, Montana. It was in force for 34 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 4, 2021, 8:26 PM MDT (02:26 UTC)
- Expired
- Aug 4, 2021, 9:00 PM MDT
- In force
- 34 min
- Issued by
- NWS Missoula, MT
- Area
- Storm-based polygon
- Damage threat
- Considerable
- Hail
- 1.75 in
- Wind
- 60.0 mph
County Lake County, MT
The radar
The Missoula radar (KMSX), 81 km from the middle of the area, began a volume at 02:26 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, 2.4 hours before the alert went out and 183 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
- 502 J/kg
- Mixed-layer CIN
- -9 J/kg
- Mixed-layer LCL
- 3045 m above ground
- 0-6 km bulk shear
- 28 kt
- 0-1 km storm-relative helicity
- 29 m²/s²
- 0-3 km storm-relative helicity
- 58 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.3
The text
As transmitted.
776
WUUS55 KMSO 050226
SVRMSO
MTC047-050300-
/O.NEW.KMSO.SV.W.0012.210805T0226Z-210805T0300Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Missoula MT
826 PM MDT Wed Aug 4 2021
The National Weather Service in Missoula has issued a
* Severe Thunderstorm Warning for...
Northeastern Lake County in northwestern Montana...
* Until 900 PM MDT.
* At 826 PM MDT, a severe thunderstorm was located near Kings Point,
or 8 miles northeast of Polson, moving east at 20 mph.
HAZARD...Golf 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.
* Locations impacted include...
Finley Point.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 4774 11407 4781 11406 4785 11380 4771 11377
TIME...MOT...LOC 0226Z 275DEG 18KT 4778 11403
THUNDERSTORM DAMAGE THREAT...CONSIDERABLE
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$3 follow-up statements
939
WWUS55 KMSO 050232
SVSMSO
Severe Weather Statement
National Weather Service Missoula MT
832 PM MDT Wed Aug 4 2021
MTC047-050300-
/O.CON.KMSO.SV.W.0012.000000T0000Z-210805T0300Z/
Lake MT-
832 PM MDT Wed Aug 4 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 900 PM MDT
FOR NORTHEASTERN LAKE COUNTY...
At 832 PM MDT, a severe thunderstorm was located 7 miles east of
Kings Point, or 10 miles northeast of Polson, moving east at 20 mph.
HAZARD...Ping pong ball size hail and 60 mph wind gusts.
SOURCE...Radar indicated.
IMPACT...People and animals outdoors will be injured. Expect hail
damage to roofs, siding, windows, and vehicles. Expect wind
damage to roofs, siding, and trees.
This severe thunderstorm will remain over mainly rural areas of
northeastern Lake County.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 4773 11397 4782 11400 4785 11380 4771 11377
TIME...MOT...LOC 0232Z 275DEG 18KT 4778 11398
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.50 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$835
WWUS55 KMSO 050245
SVSMSO
Severe Weather Statement
National Weather Service Missoula MT
845 PM MDT Wed Aug 4 2021
MTC047-050300-
/O.CON.KMSO.SV.W.0012.000000T0000Z-210805T0300Z/
Lake MT-
845 PM MDT Wed Aug 4 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 900 PM MDT
FOR EAST CENTRAL LAKE COUNTY...
At 845 PM MDT, a severe thunderstorm was located 11 miles south of
Swan Lake, or 13 miles northeast of Polson, moving east 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.
This severe thunderstorm will remain over mainly rural areas of east
central Lake County.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 4775 11392 4781 11391 4785 11380 4771 11377
TIME...MOT...LOC 0245Z 275DEG 18KT 4777 11389
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$130
WWUS55 KMSO 050253
SVSMSO
Severe Weather Statement
National Weather Service Missoula MT
853 PM MDT Wed Aug 4 2021
MTC047-050303-
/O.EXP.KMSO.SV.W.0012.000000T0000Z-210805T0300Z/
Lake MT-
853 PM MDT Wed Aug 4 2021
...THE SEVERE THUNDERSTORM WARNING FOR EAST CENTRAL LAKE COUNTY WILL
EXPIRE AT 900 PM MDT...
The storm which prompted the warning has weakened below severe
limits, and has exited the warned area. Therefore, the warning will
be allowed to expire.
LAT...LON 4775 11392 4781 11391 4785 11380 4771 11377
TIME...MOT...LOC 0253Z 275DEG 18KT 4777 11385
$$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 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 |
| Aug 5, 5:03 PM MDT | Severe Thunderstorm Warning | MSO | Powell | 42 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.