The call comes: Evacuate, take shelter, a powerful storm is bearing down on the Lowcountry.

What to do? Where to go? How to tell people when you’re safe?

Yep, there’s an app for it now. And a free one.

The Red Cross Hurricane App features:

— An “I’m safe” button that works through Twitter, Facebook, email or the phone’s contact list.

— A shelter locator that works with GPS mapping to find shelters nearby or in a selected place, and provide directions.

— Federal weather alerts for the local area and personalized alerts for other areas where family or friends live.

The app is available for iPhone and Android users and can be downloaded from the Apple App Store or Google Play Store.

The app also features preparation steps, checklists that can be accessed even without a mobile link. The toolkit featuring the “I’m safe” button also has a toolkit with a flashlight, strobe light and audible alarm.

“That’s one of the whole points of this, to get yourself ready. Have fun with it. Get prepared,” said Nancy Olsen, of the American Red Cross Lowcountry chapter.

The app is the second in a series of disaster apps planned by the Red Cross. The first was a First Aid app that’s been downloaded more than a half million times in six weeks, according to a Red Cross news release.

Reach Bo Petersen at 937-5744, @bopete on Twitter or on Facebook.