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FIRE ISLAND, N.Y. — Hurricane Henri prompted a voluntary evacuation order for residents and visitors on Fire Island Saturday.

Suffolk County Executive Steve Bellone announced the order after forecasters predicted Henri will hit the area as a Category 1 hurricane.

The last ferry boats out will leave at 10:40 p.m. Saturday; after that, Bellone said, there may be no way out for people who decide to ride out the storm.

“If they do not leave the island today, they will be stuck on the island and we do not know what kind of conditions they may be facing. But they could be difficult. They could be dangerous,” the county executive said.

Additionally, Bellone said it’s unclear when ferry service to Fire Island would be restored because they don’t know what kind of damage this storm may inflict on the area.

Emergency shelters will be set up for evacuees.

Bellone also announced Suffolk’s bus service would be canceled on Sunday. Beaches and camp grounds will be closed at dusk on Saturday, the county executive said.

Henri strengthened to a Category 1 hurricane on Saturday and was expected to make landfall on or near Long Island by Sunday.

The National Weather Service issued a hurricane warning for Suffolk County, where Henri could make a direct hit. Officials warned of life-threatening storm surges, flooding from heavy rainfall and damaging winds of 74 to 110 mph.