In the wake of Harvey and Irma, Suffolk County officials are urging residents to to assemble emergency supply kits, map out evacuation routes and create family communications plans in the event of a hurricane.

“Don’t wait until you’re operating under stress or a couple days before,” Fire, Rescue and Emergency Services Commissioner Joseph Williams said Wednesday at a news conference in Yaphank.

Here are tips on how to prepare for extreme weather events.

1. Build an emergency supply kit.

Should include one gallon of water for each person, per day, for at least three days.

Create a supply of nonperishable foods, along with medication, a first aid kit, a flashlight, extra batteries and copies of important documents.

advertisement | advertise on newsday

2. Create a communications plan.

Should include a shelter plan and evacuation routes.

Designate a friend or a relative who lives out of town to serve as a family emergency contact.

3. Create a Smart911 profile.

To sign up, go to www.smart911.com. The program asks users for personal information, including home addresses and medical history. The information automatically displays on the screen of 911 operators when the user calls for help.

The information, linked to users’ cellphones, would be provided to 911 operators when residents use cellphone to call 911.

Planning for an emergency before it happens is vital, said Suffolk Police Commissioner Timothy Sini.

“Our message to Suffolk County residents today is it’s never too early to begin preparing for hurricanes,” he said. “We urge all residents to start preparing now. Help us help you stay safe.”