Memorial Day arrives with potential dangers at the beach

People heading to the beach for the unofficial start of summer are warned of jellyfish and sharks that they may encounter while enjoying their time by the shore.
2:34 | 05/25/19

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Transcript for Memorial Day arrives with potential dangers at the beach
unofficial start of summer by heading to the beach, there are warnings about potential dangers in the water. ABC's Zachary kiesch is out there on the Jersey shore. Zachary, good morning to you. Reporter: Dan, good morning to you as well. What a beautiful morning out here at belmar beach in new Jersey. I'm out here looking at a couple of people sitting in their lawn chairs enjoying the hey, it's going to be a big weekend around the country but there are warnings for swimmers that they feed to be aware of when they get in that water. It's the unofficial start to summer and this morning as millions head to the beach to celebrate memorial day weekend there are some dangers in the water. Reports of toxic jellyfish from New Jersey to Maine. Experts discovering 300 of the spiderlike jellyfish in one day. These are called clean jellyfish. They're very small, about the size of a dime to a quarter. Reporter: Scientists say a sting from a clinging jellyfish isn't deadly but can cause excruciating pain and while coastal ocean beaches are generally safe, you could encounter the tinily clinger by swimming in a back bay. Where we find these are in the shallow regions, he uaries and bays where we have a lot of algae or sea grass. Reporter: Also putting east coast officials on alert a great white shark that pinged earlier off of Long Island. The 500-point shark coined Cabot was tappinged by researchers last year. This interactive map shows all the tagged sharks lurking all along the east coast. This is a dynamic time of year because water temperatures will rise and those temperatures are compatible and provide an optimal habitat for the sharks. Reporter: Beyond living creatures there are other concerns. In Texas, Florida, they're facing a threat of dangerous rip currents and high tides. Along the gulf coast, red flags are up and some beaches are closed. Officials there encouraging folks to swim near a lifeguard. There are some suggestions for folks if you do get stung by a jellyfish. Experts are saying that you can apply white vinegar, one option. The other thing, clean that area with water. If you're in the ocean use the ocean water. The other suggestion is wiping that area with a towel and then applying heat, of course, hopefully you are not in that situation, whit. As I mentioned, it is a beautiful, beautiful morning in New Jersey. And we expect to see lots of people out here today. We don't think the jellyfish are going to scare people away from the beach. No. Zachary kiesch, thanks. Dan will be there with his tevas on ready to go.

This transcript has been automatically generated and may not be 100% accurate.

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