12 Oct 2021 – Western Oklahoma Supercell and Clinton Tornado

A classic severe weather setup developed over the Southern Plains, characterized by a strong upper trough and associated surface low pressure just northwest of the state.  An unusually warm and moist air mass moved north across Oklahoma during the day.  Model data had been fairly consistent in developing isolated supercell storms in the warm sector over western Oklahoma late in the day.  Any sustained storm was capable of surviving well after sunset with all facets of severe weather possible.

I started toward Watonga just after 3 pm.  The storm which would eventually produce the Clinton tornado began developing around 3:45 pm – about 150 miles to my southwest – over the northwest corner of Foard County, Texas.  In its pre-supercell state, it moved quickly north northeast, entering Oklahoma about an hour later.  It took another hour to move across Harmon County and into northwest Greer County.  Lucky for me, the developing storm spent two hours getting organized which allowed me time to move southwest toward it, with my first good view coming near Willow:

 

Around 5:45 pm, the storm put its foot in the ground, slowed down and turned to the right, and developed supercell characteristics.

6:28 pm, while the storm was over eastern Beckham County:

The storm had several areas of rotation, occasionally strong, as it moved from Beckham into Washita County.  There was a funnel cloud between Burns Flat and Retrop that came really close to becoming a tornado:

I made a stop just after sunset southwest of Clinton to shoot lightning.  At this stop, it was obvious that the storm was still quite strong and had several suspicious lowered areas:
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It seemed plausible that with an increasing low level jet, there would be a corresponding increase in tornado threat.

The tornado developed on the northeast side of Clinton at 7:55 pm.  I was driving east on I-40 at the time and only noticed some power flashes to the north.  I drove north toward Indianapolis and captured the following images: