PORTLAND, Ore. (KATU) — Tomorrow’s severe thunderstorms could drop large hail over western Oregon and Washington.

The Storm Prediction Center and National Weather Service classify any thunderstorm that drops hail of an inch in diameter or more as a severe thunderstorm.

READ MORE | Thunderstorms predicted for western Oregon and Washington with potential for large hail

“A storm or two might produce significant severe sizes of 2-2.5 inches before storms weaken over the Cascades,” the Storm Prediction Center said in an outlook. The I-5 Corridor from Eugene to Seattle is under a Slight Risk for severe storms, with hail being the biggest threat.

Large hail is not common in the Pacific Northwest, unlike the Midwest and southern United States.

The largest hailstone recorded in Oregon was four inches in diameter and fell from a Supercell thunderstorm that swept across central Oregon on July 9, 1995. The stone fell in the city of Condon, in Gilliam County.

The largest hailstone recorded in western Oregon is two inches in diameter. That hailstone fell in Seaside on January 18, 2018.

Last June, a pineapple-sized hailstone fell in Vigo Park, Texas. The United States hailstone record is 11 inches in diameter and fell in Vivian, South Dakota in 2010.

Hailstone data was compiled by National Centers for Environmental Information (NCEI)