10:30PM Update

Check out the "bulls eye" of SRH or Storm Relative Helicity across SE OK and NW TX. This parameter gauges the potential for rotation in supercell thunderstorms. The largest storm on radar below in SE OK most definitely had some spin to it. This storm prompted a Tornado Warning and may very well have put down a tornado; as of now we don't have a confirmed report.

The center of the Low has shifted to the East where much of the atmosphere was un-tapped throughout the day. With cold air continuing to funnel in aloft and a weakened inversion or complete erosion of, the atmosphere has become primed for convection. We're seeing impressive storms south of I-40, which have prompted warnings. The cell in LeFlore county continues to strengthen and will likely be putting out a good swath of hail across much of the Poteau / Sugarloaf area. This cell will move into southern Sebastian over the course of the next half hour.

As the Low moves eastward over the next few hours, expect a winding down of activity. We'll be monitoring the set-up closely for tomorrow as the next wave moves in. This looks to be a bit of a later event time-wise (Friday evening into Saturday morning) and perhaps a little stronger as it will have substantially more jet energy to work with.

Posted by Ted Zarras at 8:12 PM