Special Weather Statement for Upper Blackfoot and MacDonald Pass; Helena Valley; Big Belt, Bridger and Castle Mountains +2 more
Official alert fields
What you need to know
- Applies to
- Big Belt, Bridger and Castle Mountains, Canyon Ferry Area, Elkhorn and Boulder Mountains, Helena Valley, Upper Blackfoot and MacDonald Pass
- Effective
- Ended
- Official severity
- Moderate
- Official urgency
- Expected
- Official certainty
- Observed
What is happening
At 549 PM MDT, Doppler radar was tracking a cluster of strong thunderstorms along a line extending from near Helena to 9 miles northeast of Boulder. Movement was northeast at 10 mph. HAZARD...Wind gusts of 50 to 55 mph and pea size hail. SOURCE...Radar indicated. IMPACT...Gusty winds could knock down tree limbs and...
What the bulletin says to do
If outdoors, consider seeking shelter inside a building. Torrential rainfall is also occurring with these storms and may lead to localized flooding. Do not drive your vehicle through flooded roadways. These storms may intensify, so be certain to monitor local radio stations and available television stations for additional information and possible warnings from the National Weather Service.
Full official description
Bulletin details
At 549 PM MDT, Doppler radar was tracking a cluster of strong thunderstorms along a line extending from near Helena to 9 miles northeast of Boulder. Movement was northeast at 10 mph. HAZARD...Wind gusts of 50 to 55 mph and pea size hail. SOURCE...Radar indicated. IMPACT...Gusty winds could knock down tree limbs and blow around unsecured objects. Minor hail damage to vegetation is possible. Locations impacted include... Helena, East Helena, Montana City, Winston, Alhambra, Corbin, Spring Meadow Lake State Park, Clancy, and Jefferson City.
Lifecycle record
Official revisions
- Alert
Special Weather Statement issued August 22 at 5:49PM MDT by NWS Great Falls MT
Official revision
Source and limitations
Publisher: Weather Alert Watch. Primary source: NWS Great Falls MT. This page reorganizes official fields and does not add a forecast or expand the affected area.
- CAP status
- Actual
- Message type
- Alert
- Last collected