The above image was just taken from the Tulsa area radar. You can see thunderstorms trying to break the cap and develop to the North of Vinita, North/Northeast of Claremore and just South of Okmulgee (this is the persistent echo that formed back in Okfuskee county over an hour ago).
If you look closely, you can also see a thin blue line extending across the Tulsa Metro area, roughly from Owasso to just West of Downtown Tulsa to just East of Kellyville, and on back to the Southwest. This represents a line of congested or towering cumulus clouds that are trying to develop into thunderstorms as well. The image below is the same radar as above, but with that area outlined in red:
This boundary is moving slowly Eastward, at about 15 mph. Thunderstorms could form along this boundary, or most likely just East of it, at any time over the next hour. If the boundary continues to move at its present pace, it will pass to the East of Tulsa by 6:30 PM.
Any thunderstorm that forms along or ahead of this boundary over the next 1-2 hours will explode and become severe very rapidly. Very large hail, damaging winds and tornadoes will be possible with any severe storm that developes.
Please stay alert if you live in this region.