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Lewis and Clark County weather alerts

1 active alert for Lewis and Clark County, Montana right now: a Flood Watch.

19 in the last 30 days 19 in 12 months (since Aug 30) most common: Severe Thunderstorm Warning Get alerts on your phone →

Active alerts for Lewis and Clark County

Refreshed every few minutes; times in MDT.

Severe Future

Flood Watch

Issued Sun, Sep 6, 11:32 AM MDT by NWS Great Falls MT Until Tue, Sep 8, 12:00 PM MDT (in 2 day)

Area: East Glacier Park Region; Northern High Plains; Eastern Glacier, Western Toole, and Central Pondera; Eastern Toole and Liberty; Southern Rocky Mountain Front; Southern High Plains; Eastern Pondera and Eastern Teton

* WHAT...Flooding caused by excessive rainfall is possible. * WHERE...A portion of north central Montana, including the following areas, East Glacier Park Region, Eastern Glacier, Western Toole, and Central Pondera, Eastern Pondera and Eastern Teton, Eastern Toole and Liberty, Northern High Plains, Southern High Plains and Southern Rocky Mountain Front. *...

What it means: Conditions are favourable for flooding. Have a plan in case a warning is issued.

Full alert with map and forecast →

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Where

Lewis and Clark 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 Lewis and Clark County

Alert	Issued	Ended	Issued by
Severe Thunderstorm Warning	7:27 PM	8:00 PM	Great Falls MT
Severe Thunderstorm Warning	7:13 PM	8:00 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	6:37 PM	Cancelled 6:48 PM	Great Falls MT
Severe Thunderstorm Warning	6:25 PM	7:00 PM	Great Falls MT
Special Weather Statement	6:14 PM	6:45 PM	Great Falls MT
Severe Thunderstorm Warning	6:13 PM	6:15 PM	Great Falls MT
Severe Thunderstorm Warning	6:11 PM	7:00 PM	Great Falls MT
Severe Thunderstorm Watch	5:53 PM	Sep 7, 1:00 AM	Great Falls MT
Severe Thunderstorm Warning	5:50 PM	6:15 PM	Great Falls MT
Severe Thunderstorm Warning	5:27 PM	6:15 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 Lewis and Clark County gets alerted for

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

Severe Thunderstorm Warning

Special Weather Statement

Hydrologic Outlook

Flood Watch

Severe Thunderstorm Watch

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.

Flood Watch

Conditions are favourable for flooding. Have a plan in case a warning is issued.

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.

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 Watch

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

Hydrologic Outlook

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

Nearby

Alerts near Lewis and Clark County

Neighbouring counties in Montana

Powell County1 Teton County1 Cascade County Jefferson County Broadwater County Granite County1 Meagher County Flathead County2 All of Montana →

Questions

About Lewis and Clark County alerts

How do I get Lewis and Clark County weather alerts on my iPhone?

Install Forecast Bar, add Lewis and Clark County as a location, and turn on severe weather alerts. Every NWS warning, watch and advisory for Lewis and Clark 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 Lewis and Clark County. 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/lewis-and-clark-county.json returns the active alerts, the last 30 days and the 12-month counts for Lewis and Clark County, refreshed every minute. Please cache responses and credit National Weather Service as the source.

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