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It's called the "presidential alert," but the President doesn't actually write it.
Instead, FEMA officials confer with other government agencies and the White House, select one of several pre-written messages, customize the message to fit the particular emergency and send it out.
"The President will not originate this alert, say, from his mobile device," a senior FEMA official told reporters on Tuesday. "You would not have a situation where any sitting president would wake up one morning and attempt to send a particular message."