Winter Storm Warning issued October 11 at 11:30PM MDT until October 12 at 6:00AM MDT by NWS Great Falls MT
Official severe-weather alerts, warning areas, and disaster updates.
expired · active · official-source
* WHAT...Heavy snow. Additional snow accumulations up to two inches. * WHERE...Big Belt, Bridger and Castle Mountains. * WHEN...Until 6 AM MDT Monday. * IMPACTS...Travel could be very difficult. The wet and heavy nature of the snow could bring down tree branches. Isolated power outages are possible. If you must travel, keep an extra flashlight, food, and water in your vehicle in case of an emergency. The latest road conditions for the state you are calling from can be obtained by calling 5 1 1.
- Event time
- Source last updated
- Current version retrieved
- Provider
- NWS — active weather alerts (Storm)
- Location
- MT, US
- Severity
- Severe
- area
- Big Belt, Bridger and Castle Mountains
- event
- Winter Storm Warning
- onset
- 2026-10-11T23:30:00-06:00
- states
- ["MT"]
- urgency
- Expected
- certainty
- Likely
- effective
- 2026-10-11T23:30:00-06:00
- message id
- urn:oid:2.49.0.1.840.0.c6bb822649d9a5d29d7e123d0a52302a0a26b5d3.005.1
- references
- ["urn:oid:2.49.0.1.840.0.a4d4a9222f663d05f8aa360416294ff95b266b53.007.1"]
- instruction
- If you must travel, keep an extra flashlight, food, and water in your vehicle in case of an emergency. The latest road conditions for the state you are calling from can be obtained by calling 5 1 1.
- message type
- Update
- location basis
- Approximate: centers of the NWS zones listed in the alert
- freshness minutes
- 60
Source use policy · US government work (17 U.S.C. 105)
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Update history (1 recent revisions)
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