Storms are expected to develop in northwestern Oklahoma Tuesday evening, bringing the greatest risk of severe weather to western, northwestern and northern parts of the state before rain spreads east overnight and statewide Wednesday. The main Tuesday threat includes wind gusts of 60 to 70 mph, hail up to 1.5 inches in diameter and isolated flooding. Some storms could rotate, but the tornado risk is low. The risk index reaches 2 out of 10 in western and northwestern Oklahoma and is 1 out of 10 in surrounding areas. Western and northwestern communities including Altus, Elk City, Cheyenne, Woodward and Alva are in a level 2, or slight, severe-weather risk area. A broader level 1, or marginal, risk extends from southwestern Oklahoma into the north, including Enid, areas north of Stillwater, Ponca City and Bartlesville. Altus, Hobart and Clinton are near the boundary between the two risk zones. Oklahoma City is outside Tuesday’s severe-weather risk areas. Storms could begin forming near Beaver and Buffalo around 5 p.m., then strengthen between 6 and 6:30 p.m. Scattered showers and thunderstorms are expected in the Panhandle and far western Oklahoma by about 8 p.m. Storms should move east but remain mainly in the far west and northwest through 9 or 10 p.m. The storms are forecast to continue overnight. Scattered showers could reach central Oklahoma around midnight, while northern Oklahoma has the highest overnight chance of showers and thunderstorms. The heaviest storms are expected to leave the state by 7 a.m. Wednesday, though showers may linger in central Oklahoma. Another round of rain is forecast Wednesday, with showers possible statewide through the day and into the evening. By 5 p.m., the chance of rain in the Oklahoma City metro is forecast at 80%. Most of Oklahoma, including the metro, faces a level 1 marginal severe-weather risk Wednesday. The tornado threat is expected to be unlikely; flooding, strong wind gusts and hail are the primary concerns.