CHICAGO — Gas prices in Illinois and Indiana are the highest on record for Labor Day weekend as a result of oil refinery shutdowns caused by Hurricane Harvey, AAA Chicago reported Friday.

Loss of Gulf Coast refineries and pipelines — including a major supply line to the Midwest — also comes as demand picks up for holiday travel.

It will be days or even weeks before the energy sector in the southeast Texas Gulf Coast is back to normal operations as it deals with flooding in the aftermath of Harvey, which has been downgraded to a tropical storm.

The region from Corpus Christi, Texas, where Harvey made landfall, to the Louisiana state line accounts for about 3 percent of the U.S. economy and is a crucial export market for oil and chemicals.

Harvey isn’t the first big storm to hit the refinery-rich Gulf Coast, but the oil industry has undergone big changes since the last major interruption from Hurricane Ike in 2008.

The highest gas prices on record in Illinois, topping $4 a gallon, resulted when Hurricane Ike hit the Gulf Coast in the summer of 2008, according to AAA.