Experts say jellyfish are turning up on Long Island beaches in droves and well ahead of schedule.

The invertebrates are appearing on Long Island shores about a month early. Warning signs are posted at north shore beaches like Sunken Meadow State Park.

"The first day they came there was probably about 30 stings," says lifeguard Jimmy Henn. "That was a pretty alarming rate."

Park officials say the early influx could be the result of humidity or warm water temperatures.

Beachgoers are advised to avoid the jellyfish or run the risk of being stung. If stung, an ammonia-water mixture can be used to neutralize the sting. Salt water and vinegar can also be applied to ease pain.

If those products aren't available, contact a lifeguard or someone else who can administer first aid.