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The outbreak is the deadliest of the modern NEXRAD Doppler radar era (fully implemented in 1997.) As well as the largest single outbreak since the May 31, 1985 outbreak , which killed 76 across Ohio and Pennsylvania , as well claiming 12 victims in Ontario , Canada .
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Hi,
The outbreak is the deadliest of the modern NEXRAD Doppler radar era (fully implemented in 1997.) As well as the largest single outbreak since the May 31, 1985 outbreak, which killed 76 across Ohio and Pennsylvania, as well claiming 12 victims in Ontario, Canada.

I suggest this.

The outbreak is the deadliest in the era of modern NEXRAD Doppler radar, which was fully implemented in 1997. In addition, it is the largest single outbreak since that of May 31, 1985, which killed 76 across Ohio and Pennsylvania, and claimed 12 victims in Ontario, Canada.

Best wishes, Clive
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thank you Emotion: smile