Worst Dust | Prairie Public Broadcasting
5/12/2011: Dust, driven by the wind, can infiltrate windows, nostrils, and doors. Whirling, whipping winds began stirring on May 9, 1934, in Canada’s Great Plains, lifting Saskatchewan dust into the air. The wind blew into Eastern Montana and western North Dakota. The dry soil in Williston went airborne, swept aloft by gale-force winds across the Dakota landscape. The wind blew for 24 hours non-stop. Thus began the “dust storm of the century” on May 9th and 10th.
Source: prairiepublic.org