National Weather Service United States Department of Commerce

Overview

Several rounds of thunderstorms moved across northern Dubuque and Jo Daviess Counties late last night into very early this morning.  The intial thunderstorm produced widespread damaging winds across northern Dubuque County.  In addition to the damaging winds, successive thunderstorms produced very heavy rainfall of 2 to 5 inches over a 2 to 3 hour period.  This lead to flash flooding across this area early this morning.  Earlier in the evening, a supercell thunderstorm rapidly developed and produced a tornado near Conroy, IA in Iowa county Tuesday evening.  This storm also produced torrential rain, large hail, and numerous lightning strikes as it slowly tracked east. Late that evening

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7/11/17 21z Surface Analysis
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