Mineral storm history

A strong thunderstorm unleashed a small microburst that caused hundreds of trees to either snap in half or blow over at the Denna Mora Rest Area on Interstate 90 east of Lookout Pass. Two large fir and spruce trees with diameters up to 3 feet wide fell onto the eastbound lanes ju…

Heavy rain in the mountains caused flooding and significant erosion of forest service roads in western Mineral County. In the Superior Ranger District, the Deer Creek Bridge was compromised as the St. Regis River eroded the north bank, severely damaging the surrounding roadbed. F…

Frenchtown Rural Fire District rpeorted a structure fire after a pine tree crashed onto a power line in Alberton, causing the lines to arc. The Mineral County Disaster and Emergency Services reported that its phone lines were down. The severe winds of the derecho clipped the sout…

Outflow winds from nearby thunderstorms knocked down 20 to 25 mature trees and blew siding off an outbuilding.

Besides the golf ball-sized hail, the storm produced torrential rain which caused motorists to pull off to the side of Interstate 90.

Two different reports of golf ball-sized hail in the St. Regis area.

Strong winds caused several Ponderosa pine trees to be uprooted. These trees damaged a well house and an all-terrain vehicle.

The St. Regis River at St. Regis peaked at the minor flood stage of 8.06 feet.

Ponding water up to 3 feet deep near Saltese, MT on I-90 lead the Montana Dept. of Transportation to close the roadway for much of the day. Antecedent heavy low-elevation snow allowed for this event, as water was unable to drain off the sides of the road. After plows cut breaks i…

A business in Saltese, MT reported quarter or larger size hail. Winds blew down some tree limbs, and the hail dented cars. The worst part of the storm lasted about 15 minutes.

An NWS Employee experienced torrential rainfall and 0.50 inch hail while driving on I-90. The hail lasted 5 min, and rain rates were so high cars on the 75 mph interstate slowed to around 25 mph for a few minutes due to reduced visibility. A nearby RAWS weather station reported 0…

A trained spotter reported mostly 0.50 inch to 0.75 inch hail, with a few nickel-sized hailstones (0.88 in). Winds were estimated to be gusting at 50 mph with the storm's passage.

The Montana Mesonet weather station near St. Regis reported 0.80 inches of rain in one hour, from 2:02pm to 3:02pm local time.

A trained spotter reported penny-sized hail in Superior, with 0.50 inches of rain falling in 30 min. Winds estimated at 40 to 50 mph accompanied this report.

Heavy rain caused a rockslide on February 7th that closed the westbound lanes of I-90 west of St Regis, MT. Several hundred small rocks and boulders had to be cleared from the road surface. No accidents were reported. Westbound lanes were closed for 2 days as traffic was forced t…

Debris flows were reported in Club Gulch in Flat Creek, Pardee Creek and at Shaw Gulch with moderate road damage.

The Camels Hump lookout reported a measured wind gust to 58 mph during the early morning hours of August 26th.

Golf ball size hail was reported to KECI TV Meteorologist from a weather spotter in Tarkio.

Thunderstorm winds blew down 3 to 4 large trees. The trees had diameters estimated to be between 1 and 3 feet along the Oregon Lakes Trail.

Thunderstorm winds were reported to have blown down several trees and large limbs down along Quartz-Lozeau road.

Severe Thunderstorm downdraft winds blew several large trees down 5 miles west of Superior.

A tree was reported down over I-90.

Two trees blew over onto a house.

Hail to 1.75 inches in diameter fell in a thunderstorm