anatomy of a rip current
Most rip currents have a “neck” and a “head” that is often defined by an unusual disturbance or choppiness in the water and by murky discoloration caused by sand and debris. As a result of the current’s speed, sand is forced into suspension often causing a rip current to be associated with “dirty” water.
Sometimes a rip current will lose its characteristic mushroom shape when strong long shore currents deflect a rip in its prevailing direction.