The alert was quickly corrected, and within five minutes the National Weather Service was issuing all clear messages on its various social media accounts.
The push notification sent to phones in SC was reportedly sent by the AccuWeather app, according to The Post and Courier of Charleston. The US official apparently sent out the message during a state-wide test because he genuinely believed they were under attack.
And there, in an orange banner, were the words "Tsunami warning".
AccuWeather also explained the test in a tweet Tuesday morning.
A bogus tsunami warning caused a flood of Tuesday morning confusion along the East Coast.
One hour after the false warning, the NWS posted on Twitter: "There is NO current Tsunami Warning, Advisory, Watch, or Threat for the U.S".
The National Weather Service (NWS) accidentally sent out a tweet Tuesday morning telling East Coast residents to be on high alert for a tsunami set to hit their cities.
"Looking out the window and seeing the ocean puts you in a different frame of mind when you get a tsunami warning, " he said. A Tsunami Warning is not in effect.
Tsunamis are giant waves caused by earthquakes or volcanic eruptions under the sea.
Tuesday's false alarm may have hit a little too close to home for some after residents in Hawaii were left in a panic January 13 when an erroneous alert was sent to cellphones saying there was a ballistic missile threat.
The false warning was more widespread than the Charleston area.
The message, sent in error, read "Ballistic Missile Threat Inbound To Hawaii". That employee, who had "confused real-life events and drills in the past" according to the FCC, was fired.
-This report was updated at 12:12 p.m.