Tulsa, OK – Residents in eastern Oklahoma and northwest Arkansas should prepare for potential rain this Friday, especially along the I-49 corridor. Rainfall is expected to be light, with the heaviest totals forecast east of I-49, according to the National Weather Service (NWS) in Tulsa. The showers will begin early Friday morning and continue through Friday night, impacting areas such as Muskogee, Fort Smith, and Fayetteville.