At 530 PM…a dryline extended from west of Fairview…south to Elk City…to near Altus…then south to near Knox City in western North Texas. A weak stationary front was across northern Oklahoma…but its location has become obscured by thunderstorms. Numerous thunderstorms continue to the east of the dryline. One cluster of storms covered much of north-central Oklahoma…while more isolated storms extended south to Kingfisher…Hobart…and Vernon Texas. The storms were moving toward the east at about 30 mph. A very warm…humid…and extremely unstable airmass is east of these storms. The area of extreme instability extended east as far as Chandler…Shawnee…Pauls Valley…and Marietta. This environment will continue to support severe weather into the early evening hours. The strongest storms will produce very large hail and damaging winds. Tornadoes will also be possible.