When severe weather threatens your community, it’s best to have a plan and stay in touch, experts say.

With Long Island bracing for a wicked winter storm starting early Saturday that could bring heavy coastal flooding, the Federal Emergency Management Agency and National Weather Service offer tips for staying safe.

Along with with similar preparedness advice shared by Gov. Andrew M. Cuomo’s office on Thursday, tips for those facing coastal flooding include having a three-day supply of nonperishable food and bottled water as part of a disaster kit. Such kits also can include medicine, batteries, blankets and alternative heating resources.

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Should water levels rise to dangerous levels, residents should have an escape plan, authorities advise, with a designated meeting place should residents be split up.

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Sandbags can keep water from low-lying areas, and plywood and sheeting can cover windows and doors exposed to water.

Make sure cellphones are charged should you lose power, the experts say. And finally, stay off the road and don’t drive into floodwaters, the service said.