Take a look at this current radar image from Oklahoma City. It promises a very bumpy evening for residents of the Sooner State.
Let’s address that big line that rolled through Oklahoma City just now. Note the narrow blue band ahead of the primary line. That’s likely not actually precipitation, but rather the dust and particulate forced ahead of the line by very strong winds rushing ahead of the line. Usually, we would call this an outflow boundary, but that would indicate a collapsing storm, which this storm is not doing. It’s just hauling through Oklahoma, generating a lot of straight line wind.
If you look to the west, there are a couple of smaller bow echoes, which are undoubtedly producing strong winds of their own, and given their stronger radar returns, might be contributing some small hail as well.
All these storms are riding a mostly stationary boundary, which is the case with derechoes. Those straightline wind events are generally long lasting (expect to see this storm in Arkansas or Louisiana tomorrow morning) because they have the stationary boundary to ride, and produce widespread damage, thanks the to the breadth of these storms.
Fortunately, the storm is through Oklahoma City for the night, and the largest town it should clip overnight is McAlester, but places like Pine Bluff and Shreveport should be ready for an early wake up call!