Montana severe thunderstorm warnings
There are no severe thunderstorm warnings in Montana right now. The last one was issued on September 14, 2026.
A thunderstorm is producing, or is about to produce, hail one inch or larger or wind gusts of 58 mph or more.
Updated from the National Weather Service · lists refresh hourly; the live map loads current alerts directly from the NWS
Active severe thunderstorm warnings in Montana
None right now. Other active alerts in Montana: none.
Severe Thunderstorm Warnings in Montana by year
Montana averaged 331.6 severe thunderstorm warnings per year from 2016 to 2025, and has had 449 so far in 2026. The most recent was issued on September 14, 2026.
Counties with the most severe thunderstorm warnings
| County | 2016–2025 |
|---|---|
| Valley County | 328 |
| Garfield County | 320 |
| McCone County | 300 |
| Big Horn County | 244 |
| Roosevelt County | 241 |
| Rosebud County | 233 |
| Fergus County | 231 |
| Dawson County | 224 |
| Chouteau County | 220 |
| Carter County | 218 |
What a severe thunderstorm warning means
The National Weather Service calls a thunderstorm severe when it produces hail at least one inch in diameter (about the size of a quarter), wind gusts of at least 58 mph, or a tornado. A severe thunderstorm warning is issued for the storm itself and the area in its path, usually for 30 to 60 minutes.
More about severe thunderstorm warnings and the national map →
What to do
- Move indoors to a sturdy building and stay away from windows.
- Park vehicles in a garage or under cover if hail is expected and there is time.
- Avoid driving into the storm core, where hail and downed trees are worst.
- Be ready to shelter if a tornado warning follows.