Severe Thunderstorm Warning — Lewis and Clark County, Montana
A thunderstorm capable of producing damaging winds of 58+ mph and/or 1-inch hail has been detected.
Current Status
⛈️ Active: Severe Thunderstorm Warning
Severe Thunderstorm Warning issued September 2 at 2:57PM MDT until September 2 at 4:00PM MDT by NWS Great Falls MT
SVRTFX The National Weather Service in Great Falls has issued a * Severe Thunderstorm Warning for... Central Lewis and Clark County in west central Montana... Teton County in north central Montana... Western Cascade County in central Montana... * Until 400 PM MDT. * At 256 PM MDT, severe thunderstorms were located along a line extending from 33 miles west of Choteau to 8 miles east of Augusta to 12 miles southwest of Fairfield to 13 miles north of East Helena, moving northeast at 35 mph. HAZARD...70 mph wind gusts. SOURCE...Radar indicated. IMPACT...Expect considerable tree damage. Damage is likely to mobile homes, roofs, and outbuildings. * Locations impacted include... Choteau, Cascade, Fairfield, Dutton, Fort Shaw, Power, Pishkun Reservoir, Vaughn, First Peoples Buffalo Jump State Park, Sun River, Tower Rock State Park, Collins, Bynum, Craig, Ulm, Pendroy, Black Sandy State Park, Farmington, and Simms.
Effective September 2, 2026 at 4:57 PM ET · Expires September 2, 2026 at 6:00 PM ET
Event Details
Event Type
Severe Thunderstorm Warning
Severity
severe
Issued By
NWS Great Falls MT
Expires
September 2, 2026 at 6:00 PM ET
Last Checked
2 minutes ago
What To Do
📋 Official NWS Guidance
For your protection move to an interior room on the lowest floor of a building.
Also In Effect For
This same Severe Thunderstorm Warning also covers:
Other Active Alerts in Montana
Severe Thunderstorm Warning
Severe Thunderstorm Warning
Severe Thunderstorm Warning
Severe Thunderstorm Warning
Severe Thunderstorm Watch
Severe Thunderstorm Warning
Get Severe Thunderstorm Warning Alerts for Lewis and Clark County
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Frequently Asked Questions
What does a Severe Thunderstorm Warning mean for Lewis and Clark County, Montana?
A thunderstorm capable of producing damaging winds of 58+ mph and/or 1-inch hail has been detected.
Is this Severe Thunderstorm Warning currently active?
Yes — this alert is active as of our last check (2 minutes ago). It's set to expire September 2, 2026 at 6:00 PM ET.
How do I get notified about Severe Thunderstorm Warning alerts for Lewis and Clark County?
Download StormCast free on Google Play and set Lewis and Clark County, Montana as one of your monitored locations. StormCast checks the NWS feed continuously and pushes alerts like this directly to your phone — even with the screen off.
What other areas does this alert cover?
This same Severe Thunderstorm Warning is also in effect for Teton County, Cascade County.