Alert archive / Montana / Severe Thunderstorm Warnings in 2026
Severe Thunderstorm Warning 21, NWS Missoula, MT
NWS Missoula, MT issued this severe thunderstorm warning at Aug 22, 2026, 5:27 PM MDT for Flathead County, Lincoln County, Montana. It was in force for 48 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
- Aug 22, 2026, 5:27 PM MDT (23:27 UTC)
- Expired
- Aug 22, 2026, 6:15 PM MDT
- In force
- 48 min
- Issued by
- NWS Missoula, MT
- Area
- Storm-based polygon
- Hail
- 1.0 in
- Wind
- 60.0 mph
Counties Flathead County, MT, Lincoln County, MT
The radar
The Missoula radar (KMSX), 150 km from the middle of the area, began a volume at 23:27 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 |
|---|---|---|---|
| Aug 22, 6:00 PM MDT | TSTM WND GST 54 | La Salle, MT | ASOS station KGPI Kalispell. |
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, 11.5 hours before the alert went out and 317 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
- 22 J/kg
- Mixed-layer CIN
- -584 J/kg
- Mixed-layer LCL
- 2213 m above ground
- 0-6 km bulk shear
- 2 kt
- 0-1 km storm-relative helicity
- -16 m²/s²
- 0-3 km storm-relative helicity
- 23 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
569
WUUS55 KMSO 222327
SVRMSO
MTC029-053-230015-
/O.NEW.KMSO.SV.W.0021.260822T2327Z-260823T0015Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Missoula MT
527 PM MDT Sat Aug 22 2026
The National Weather Service in Missoula has issued a
* Severe Thunderstorm Warning for...
West Central Flathead County in northwestern Montana...
East Central Lincoln County in northwestern Montana...
* Until 615 PM MDT.
* At 527 PM MDT, a severe thunderstorm was located 17 miles southwest
of Whitefish, or 17 miles west of Kalispell, moving northeast at 40
mph.
HAZARD...60 mph wind gusts and small hail.
SOURCE...Radar indicated.
IMPACT...Expect damage to roofs, siding, and trees.
* Locations impacted include...
Whitefish, Columbia Falls, Lupfer, Olney, Marion and La Salle.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Seek shelter inside a well-built structure and stay away from
windows. This storm is capable of producing damaging winds.
&&
LAT...LON 4823 11487 4831 11498 4868 11447 4835 11406
4809 11469
TIME...MOT...LOC 2327Z 235DEG 36KT 4829 11466
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$2 follow-up statements
581
WWUS55 KMSO 222354
SVSMSO
Severe Weather Statement
National Weather Service Missoula MT
554 PM MDT Sat Aug 22 2026
MTC053-230004-
/O.CAN.KMSO.SV.W.0021.000000T0000Z-260823T0015Z/
Lincoln MT-
554 PM MDT Sat Aug 22 2026
...SEVERE THUNDERSTORM WARNING IS CANCELLED FOR EAST CENTRAL LINCOLN
COUNTY...
A Severe Thunderstorm Warning still remains in effect for a portion
of Flathead County until 615 PM MDT.
&&
LAT...LON 4829 11470 4840 11485 4868 11447 4835 11406
4819 11444
TIME...MOT...LOC 2327Z 235DEG 36KT 4829 11465
$$
MTC029-230015-
/O.CON.KMSO.SV.W.0021.000000T0000Z-260823T0015Z/
Flathead MT-
554 PM MDT Sat Aug 22 2026
...SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 615 PM MDT FOR
WEST CENTRAL FLATHEAD COUNTY...
At 554 PM MDT, a severe thunderstorm was located over Whitefish, or
14 miles north of Evergreen, moving northeast at 40 mph.
HAZARD...60 mph wind gusts and small hail.
SOURCE...Radar indicated.
IMPACT...Expect damage to roofs, siding, and trees.
Locations impacted include...
Whitefish, Columbia Falls, Lupfer, Olney and La Salle.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Seek shelter inside a well-built structure and stay away from
windows. This storm is capable of producing damaging winds.
&&
LAT...LON 4829 11470 4840 11485 4868 11447 4835 11406
4819 11444
TIME...MOT...LOC 2327Z 235DEG 36KT 4829 11465
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$210
WWUS55 KMSO 230011
SVSMSO
Severe Weather Statement
National Weather Service Missoula MT
611 PM MDT Sat Aug 22 2026
MTC029-230021-
/O.EXP.KMSO.SV.W.0021.000000T0000Z-260823T0015Z/
Flathead MT-
611 PM MDT Sat Aug 22 2026
...SEVERE THUNDERSTORM WARNING WILL EXPIRE AT 615 PM MDT FOR WEST
CENTRAL FLATHEAD COUNTY...
&&
LAT...LON 4829 11470 4840 11485 4868 11447 4835 11406
4819 11444
TIME...MOT...LOC 2354Z 236DEG 36KT 4845 11431
$$The office that day
Everything else NWS Missoula, MT issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 21, 9:59 PM MDT | Special Weather Statement | MSO | 31 min | |
| Aug 22, 9:08 AM MDT | Red Flag Warning | MSO | Beaverhead, Deer Lodge, Granite, Jefferson, Powell, Silver Bow | 35 hr |
| Aug 22, 9:08 AM MDT | Red Flag Warning | MSO | Flathead, Lincoln, Mineral, Missoula, Sanders | 21 hr |
| Aug 22, 2:45 PM MDT | Special Weather Statement | MSO | Ravalli | 45 min |
| Aug 22, 3:39 PM MDT | Special Weather Statement | MSO | Sanders | 36 min |
| Aug 22, 4:09 PM MDT | Special Weather Statement | MSO | Sanders | 66 min |
| Aug 22, 4:12 PM MDT | Special Weather Statement | MSO | Missoula | 48 min |
| Aug 22, 4:30 PM MDT | Special Weather Statement | MSO | Lincoln | 60 min |
| Aug 22, 5:09 PM MDT | Special Weather Statement | MSO | Lincoln | 66 min |
Nearby
Severe Thunderstorm Warnings in Montana, 2026Every severe thunderstorm warning in 2026
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.