Heavy Snow in Eastern Toole and Liberty, Montana

A coop observer in Chinook measured storm total snow of 8.9 inches over two reports. The start, criteria, and end times are estimated.

An initial Canadian cold front brought a much colder airmass southward through North-central Montana to nearly the I-90 corridor on the 11th. As a mid level warm front overran this airmass, instances of heavy snow were observed from the 12th into the 13th. Cold air near the surface and warm nose aloft between the Helena area and Townsend area resulted in significant icing the morning of the 12th.