Hawaii is preparing for a powerful storm this week that is expected to cause intense winds, thunderstorms and possibly significant flooding across multiple islands.

Josh Green, the governor, said on Monday he had issued an emergency proclamation in response to the weather expected to hit his state in the coming days, in order to bring additional resources into effected areas.

“It’s going to be kind of a rough and tumble week with the weather,” Green said in a video posted on social media. “Be very safe. Be particularly safe on the roads.”

The National Weather Service has advised a “large and powerful kona storm” will deliver heavy rainfall, causing flooding on smaller islands and urban areas, as well as potentially severe thunderstorms and gusty winds. It will first hit Kauai, Niihau and Oahu on Tuesday, before expanding to other islands in the coming days.

Later in the week, the islands could see more damaging conditions, the governor’s office said in a statement.

The state has closed several parks and trails in response to the forecast, and urged people to avoid both forested and coastal areas, citing the dangers of storm surge, high surf, rising streams and falling trees.

“Our priority is keeping the people of Hawaiʻi safe,” Green said.

A flood watch is in effect until Saturday, and the NWS has said residents should be prepared by identifying evacuation routes and shelters, and planning for pets and vulnerable family members.

A meteorologist with the National Weather Service told the San Francisco Chronicle the islands could see more than 20in of rain in some areas. “But that’s just a ballpark estimate,” Laura Farris said.