Chase Log

July 17th, 2011 North Dakota Tornadoes

We started EARLY in the day on July 18th, with a tornado warned supercell riding along and slightly north of an outflow boundary from previous night’s convection. This storm had that slightly elevated look but still was tornado warned almost its entire 6-8 hour life cycle from around 10am till about 4-6pm. It did produce one tornado we could confirm. We eventually blew it off and headed for another supercell, a big beastly HP storm, south of Jamestown, ND. This storm produced an EF3 tornado north of Berlin, ND, and was a monster. As this storm lined out, another tornado warned supercell formed on the outflow from the Berlin storm and became briefly tornado warned.

One thing to note, the first two photos, the Juanita, ND tornado, are from a friend who was with us. The menacing photo of the Berlin storm and rain wrapped tornado was nuts! During that shot there were amazingly rapid rotating rain curtains that you can see rotating from left to right (south to north). The tornado was occasionally partially visible through the wrapping rain curtains.

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