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Great Falls weather alerts

1 active alert for Great Falls, Montana right now: a Severe Thunderstorm Watch.

20 in the last 30 days 20 in 12 months (since Aug 30) most common: Special Weather Statement Get alerts on your phone →

Active alerts for Cascade County

NWS issues alerts by county; Great Falls is in Cascade County. Refreshed every few minutes; times in MDT.

Severe Future

Severe Thunderstorm Watch

Issued Sun, Sep 6, 5:53 PM MDT by NWS Great Falls MT Until Mon, Sep 7, 1:00 AM MDT (in 3 hr)

Area: Blaine, MT; Broadwater, MT; Cascade, MT; Chouteau, MT; Fergus, MT; Hill, MT; Judith Basin, MT; Lewis and Clark, MT; Liberty, MT; Meagher, MT

THE NATIONAL WEATHER SERVICE HAS ISSUED SEVERE THUNDERSTORM WATCH 662 IN EFFECT UNTIL 1 AM MDT MONDAY FOR THE FOLLOWING AREAS IN MONTANA THIS WATCH INCLUDES 10 COUNTIES IN CENTRAL MONTANA CASCADE FERGUS JUDITH BASIN MEAGHER IN NORTH CENTRAL MONTANA BLAINE CHOUTEAU HILL LIBERTY IN SOUTHWEST MONTANA BROADWATER IN WEST CENTRAL MONTANA LEWIS AND CLARK THIS IN...

What it means: Conditions are favourable for severe thunderstorms with large hail or damaging wind. Keep an eye on the sky and on warnings.

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Where

Cascade County on the map

Alert polygons are NWS's own. Forecast Bar's radar shows the same warnings over live precipitation, with future radar and lightning. See the radar.

Last 30 days

Recent alerts for Cascade County

AlertIssuedEndedIssued by
Special Weather Statement 8:18 PM 9:00 PM Great Falls MT
Special Weather Statement 7:44 PM 8:15 PM Great Falls MT
Severe Thunderstorm Warning 7:27 PM 8:00 PM Great Falls MT
Severe Thunderstorm Warning 7:24 PM 7:30 PM Great Falls MT
Severe Thunderstorm Warning 7:23 PM 8:30 PM Great Falls MT
Severe Thunderstorm Warning 7:13 PM 8:00 PM Great Falls MT
Severe Thunderstorm Warning 7:03 PM 7:30 PM Great Falls MT
Special Weather Statement 6:47 PM 7:30 PM Great Falls MT
Special Weather Statement 6:44 PM 7:15 PM Great Falls MT
Severe Thunderstorm Warning 6:42 PM 7:30 PM Great Falls MT
Special Weather Statement 6:16 PM 7:00 PM Great Falls MT
Special Weather Statement 6:14 PM 6:45 PM Great Falls MT
Special Weather Statement 4:54 PM 5:45 PM Great Falls MT
Hydrologic Outlook 1:54 AM 12:00 PM Great Falls MT
Special Weather Statement Sep 5, 9:16 PM Sep 5, 10:00 PM Great Falls MT
Special Weather Statement Sep 5, 8:37 PM Sep 5, 9:15 PM Great Falls MT
Special Weather Statement Sep 5, 7:47 PM Sep 5, 8:30 PM Great Falls MT
Special Weather Statement Sep 5, 6:54 PM Sep 5, 7:30 PM Great Falls MT
Hydrologic Outlook Sep 5, 10:40 AM 12:00 PM Great Falls MT

Pattern

What Cascade County gets alerted for

Every alert that named Cascade County in the last 12 months, by type. Records begin August 30, 2026, so this fills in over the year.

Special Weather Statement
11
Severe Thunderstorm Warning
6
Hydrologic Outlook
2
Severe Thunderstorm Watch
1

Plain English

What these alerts mean

A warning means the hazard is happening or about to; a watch means conditions favour it; an advisory is a lesser hazard still worth planning around.

Severe Thunderstorm Watch

Conditions are favourable for severe thunderstorms with large hail or damaging wind. Keep an eye on the sky and on warnings.

Special Weather Statement

A heads-up about conditions that do not meet warning or advisory criteria but still deserve attention, such as a strong storm, patchy fog or a brief burst of snow.

Severe Thunderstorm Warning

A storm with hail of 1 inch or larger, winds of 58 mph or more, or both, is occurring or imminent. Move indoors and away from windows.

Hydrologic Outlook

Flooding may develop over the coming days as rain, snowmelt or river levels rise.

Nearby

Alerts near Great Falls

Cities

Bozeman, MT Missoula, MT2 Billings, MT Coeur d'Alene, ID Spokane Valley, WA Idaho Falls, ID

Neighbouring counties in Montana

Meagher County1 Lewis and Clark County2 Teton County1 Chouteau County4 Judith Basin County2 All of Montana →

Questions

About Great Falls alerts

How do I get Great Falls weather alerts on my iPhone?

Install Forecast Bar, add Great Falls as a location, and turn on severe weather alerts. Every NWS warning, watch and advisory for Cascade County then arrives as a push notification at the moment of issue, with Critical Alerts available for the most dangerous warnings. Forecast Bar also runs on iPad, Apple Watch, Mac and Apple TV.

Where do these alerts come from?

From the National Weather Service alert feed (api.weather.gov). NWS issues alerts by county and by forecast zone; this page lists every product that names Cascade County, the county Great Falls sits in. Forecast Bar checks the feed continuously and this page refreshes within a few minutes of a change.

What is the difference between a watch, a warning and an advisory?

A warning means the hazard is occurring, imminent or very likely: act now. A watch means conditions are favourable for it to develop: prepare and stay informed. An advisory covers a hazard that is less serious than a warning but can still cause real inconvenience or danger if you are not ready for it.

Can I get this data as JSON?

Yes. /weather-alerts/mt/great-falls.json returns the active alerts, the last 30 days and the 12-month counts for Great Falls, refreshed every minute. Please cache responses and credit National Weather Service as the source.

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