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The Citizen app will include weather warnings in NYC.

The announcement over the weekend follows flash floods that inundated subways. The app notifies users of nearby emergencies and crimes. Now, New York City is adding public safety warnings for floods, extreme heat, fires, and more.

An actually good flash flood alert system involves a lot more than sharing weather updates, experts tell The Verge. Officials also have to avoid causing “alert fatigue” if they’re sending out crime and weather alerts through the same platform.

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