Tropical Weather Hermine

Beachgoers stand at the edge of the water, Sunday, Sept. 4, 2016, in Bridgehampton, N.Y., on the southeastern shore of Long Island, where the effects of storm system Hermine could be seen in the rough surf and a ban on swimming. Hermine spun away from the U.S. East Coast on Sunday, removing the threat of heavy rain but maintaining enough power to churn dangerous waves and currents and keep beaches off-limits to disappointed swimmers and surfers during the holiday weekend.

(AP Photo/Jennifer Peltz)

ISLIP, N.Y. -- Federal officials in New York are investigating an emergency alert system after a mistakenly truncated message about storm system Hermine wrongly advised TV watchers on Long Island of an ordered evacuation, authorities said Sunday.



The Saturday night confusion started after Suffolk County emergency officials used an aspect of the Federal Emergency Management Agency's alert system for the first time since gaining access to it after Superstorm Sandy. They had hoped to advise viewers that a voluntary evacuation had been ordered for Fire Island, a thin strip of land off of Long Island's southern shore and a popular summertime destination.



Instead, somehow only the first part of the message -- that an evacuation order had been issued -- was broadcast to viewers. That the order was voluntary and only applied to those on Fire Island didn't make it onto TV screens.



"It caused obvious and expected questioning," said Gregory Miniutto, chief of communication for Suffolk County's Department of Fire Rescue.



Lauren Lefebvre, a spokeswoman for the FEMA region that covers New York, said officials are investigating what caused the message to be shortened.



It wasn't immediately clear how many TV viewers saw the wrong alert. Nearly 2 million people live on Long Island, with 1.5 million people in Suffolk County and another roughly 321,000 in Nassau County, census records show.

Remnants of #Hermine off East Coast keeping high pressure anchored over Ohio Valley. Dry & warmer here into midweek. pic.twitter.com/gXTPgSAMoG — NWS Wilmington OH (@NWSILN) September 4, 2016



After county officials realized the misleading alert had been sent to the public around 7:30 p.m. Saturday from FEMA's Integrated Public Alert and Warning System, a clarifying alert was subsequently issued, Miniutto said.



Emergency officials gained access to the FEMA broadcast system after 2012, when Superstorm Sandy caused major devastation, flooding and even deaths across Long Island and throughout New York and New Jersey.



Normally, Suffolk County uses another system that sends out emergency messages and mass notifications through text messages or reverse 911 calls to landlines, Miniutto said. But on Saturday evening officials decided to use the FEMA broadcast system because most of the people on Fire Island are tourists and visitors who don't have landlines or sign up for emergency alerts on their phones, he said.