Strong storms got an early start on Thursday and rumbled over northern Iowa prompting the issuance of a Severe Thunderstorm Watch. Black Hawk County (Waterloo) was one such county under the watch issued at about 12:30 PM. The featured chart presents the time of day frequency of the 122 watches valid for the county since 2006. Less than 10% of these 122 watches were active during 12:30 PM. The most common time shown is about 6:45 PM.

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