Now a new high tech buoy system in the bay is here to help us avoid jellyfish.
NOAA says the new Chesapeake Bay Interpretive Buoy System can tell when conditions are right for jellyfish, warning you to beware.
What they've learned, so far, is that areas of jellyfish can be found in water that is between 79 and 86 degrees.
The buoys are all around the bay.
Check out the system here: http://buoybay.noaa.gov/locations.html .