Heavy Rain in Mineral County, Montana

Heavy Rain February 7, 2015 – February 9, 2015 · Mineral County, Montana

Where the report was made, with tornadoes recorded within 15 miles over the years.

What the National Weather Service wrote

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 to divert to the north via MT Hwy 135 and MT Hwy 200, thus increasing travel distance. By the afternoon of Feb 9th, one lane, two-way traffic had been set-up, ending the interstate re-route.

The wider storm

An exceptionally strong atmospheric river brought up to 3 inches of precipitation and well-above normal temperatures to the region. Record-breaking temperatures into the 50s occurred in many valley locations. An unusually high number of roadway rockslides was reported.

Began near Henderson (47.3480, -115.2900).

Source: NOAA Storm Events Database, event 554468. Narratives are written by the National Weather Service forecast office that issued the report.

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