There was a significant tornado outbreak in the north-central U.S. yesterday (Thursday, 17 June 2010), with more than 50 tornado reports noted on the SPC web page. The event was associated with a deep, synoptic low-pressure area at the surface that was over North Dakota and southern Canada at mid-day yesterday. This system was a nice example of a Hage Low (named after the well-known Canadian meteorologist, Kenneth D. Hage, who studied such systems) that produces an "instant occlusion" over the northern Plains, usually in Canada. The photos of the wall cloud, and eventual tornado, shown above were taken just west of Grand Forks, North Dakota, by Melissa Becker, a student at UND.
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