Meteorologists warn rip currents will assault both the U.S. East and West Coast, as tropical cyclones spin off in the Atlantic and Eastern Pacific this week. In fact, some California beaches have closed.

Hurricane Marie is a large hurricane off the coast of Mexico. The sheer size of the storm will make waters rough as far north as California, where a High Surf Advisory is posted through Friday. People on beaches from San Diego north to Los Angeles need to be on alert.

Portuguese Point, Sacred Cove and Inspiration Point beaches are closed through Friday, according to L.A. County lifeguards. 

(MORE: Marie Will Impact U.S. Even Without Making Landfall)

Nearly 2,500 miles on the opposite coast, red flags were flying at beaches from Florida into the Mid-Atlantic Tuesday, warning beachgoers that Cristobal was churning dangerous waters into shore.

(TRACKING CRISTOBAL: Latest News | Forecast)

There was no word as of Tuesday night of any rip current deaths, but meteorologists and lifeguards strongly urge anyone heading to the beaches this week to check the surf forecast.

If caught in a rip current, NOAA says remember this:

• Remain calm to save energy and think clearly.
• Never fight the current.
• Swim out of the current in a direction following the shoreline. When out of the current, swim at an angle -- away from the current -- towards shore.
• If you are unable to swim out of the rip current, float or calmly tread water. When out of the current, swim towards shore.
• If you can't reach shore, draw attention to yourself by waving your arm and yelling for help.
• If you see someone in trouble, don't become a victim. Get a lifeguard.

MORE ON WEATHER.COM: Cristobal Hits the Caribbean