National Weather ServiceMontanaSevere Thunderstorm WarningArchive to October 1, 2026
Severe Thunderstorm Warnings in Montana
The National Weather Service issued 549 severe thunderstorm warnings for Montana in 2025 and 343 a year on average in 2008-2025; in 2021-2025 it had the 28th most of any state. 2026 through September: 449, 31% above the average of 342 for those months in 2008-2025. Valley was covered most often (658 times since 2008).
How many severe thunderstorm warnings does Montana get?
Every severe thunderstorm warning that covered part of Montana. 2026 is an outline: the year is not over.
The numbers
| Year | Count |
|---|---|
| 2026 (through September) | 449 |
| 2025 | 549 |
| 2024 | 343 |
| 2023 | 230 |
| 2022 | 476 |
| 2021 | 212 |
| 2020 | 221 |
| 2019 | 459 |
| 2018 | 334 |
| 2017 | 132 |
| 2016 | 360 |
| 2015 | 190 |
| 2014 | 260 |
| 2013 | 502 |
| 2012 | 235 |
| 2011 | 413 |
| 2010 | 446 |
| 2009 | 295 |
| 2008 | 509 |
Source: Iowa Environmental Mesonet archive of National Weather Service watches, warnings and advisories (VTEC); National Weather Service. Data as of October 1, 2026.
When in the year does Montana get them?
Sum of 2008-2025; the busiest month is labelled.
Source: Iowa Environmental Mesonet archive of National Weather Service watches, warnings and advisories (VTEC); National Weather Service. Data as of October 1, 2026.
Where in Montana?
| County or forecast zone | Since 2008 | Since 2023 | Last issued |
|---|---|---|---|
| Valley | 658 | 124 | September 7, 2026 |
| McCone | 615 | 133 | September 7, 2026 |
| Garfield | 593 | 149 | September 7, 2026 |
| Roosevelt | 524 | 116 | September 3, 2026 |
| Big Horn | 499 | 117 | August 27, 2026 |
| Rosebud | 484 | 118 | September 7, 2026 |
| Dawson | 474 | 109 | September 7, 2026 |
| Carter | 453 | 124 | September 6, 2026 |
| Powder River | 434 | 102 | August 30, 2026 |
| Richland | 431 | 108 | September 7, 2026 |
| Phillips | 422 | 92 | September 7, 2026 |
| Chouteau | 399 | 106 | September 14, 2026 |
The NWS issues these products for counties or forecast zones; a zone can be part of a county or a mountain range.
Source: Iowa Environmental Mesonet archive of National Weather Service watches, warnings and advisories (VTEC); National Weather Service. Data as of October 1, 2026.
The latest severe thunderstorm warnings for Montana in AreaZine's record
NWS Great FallsWarningSeptember 13, 2026
Severe Thunderstorm Warning: Chouteau and Judith Basin, MT
Expired 10:15 p.m. MDT, September 13, 2026
NWS GlasgowWarningSeptember 7, 2026
Severe Thunderstorm Warning: Garfield and Petroleum, MT
Expired 1:30 p.m. MDT, September 7, 2026
NWS BillingsWarningSeptember 7, 2026
Severe Thunderstorm Warning: Musselshell, MT
Expired 4:00 a.m. MDT, September 7, 2026
NWS GlasgowWarningSeptember 7, 2026
Severe Thunderstorm Warning: Phillips and Valley, MT
Expired 2:00 a.m. MDT, September 7, 2026
NWS GlasgowWarningSeptember 7, 2026
Severe Thunderstorm Warning: Phillips, MT
Expired 1:00 a.m. MDT, September 7, 2026
NWS Great FallsWarningSeptember 6, 2026
Severe Thunderstorm Warning: Blaine, MT
Expired 11:30 p.m. MDT, September 6, 2026
NWS Great FallsWarningSeptember 6, 2026
Severe Thunderstorm Warning: Fergus, MT
Expired 10:30 p.m. MDT, September 6, 2026
NWS Great FallsWarningSeptember 6, 2026
Severe Thunderstorm Warning: Cascade and Lewis and Clark, MT
Expired 8:00 p.m. MDT, September 6, 2026
This list is AreaZine's record of the NWS alert feed, kept since April 6, 2026; the counts above come from the complete IEM archive.
Source: National Weather Service alerts (api.weather.gov).
What is a severe thunderstorm warning?
A severe thunderstorm warning means a storm is producing, or is about to produce, hail one inch across or larger and/or winds of 58 mph or more. A warning means the hazard is happening, about to happen, or very likely: act now to protect people and property. The national record · Every warning type in Montana.