Chase partner, Doug Speheger put together an excellent summary of the day: http://www.spegweb.com/chase/2007/index.php#070423

We initially were targeting the Eastern Oklahoma Panhandle and drove to Elmwood, OK.  We were pretty close to the initial development that began just to our east.  We back-tracked to the area south of Laverne, but the initial storms that were trying to develop dissipated.  Storms continued to try to form in the area, and we set up camp south of Laverne, OK for an hour and a half, just waiting for a storm to take hold.  Finally, one storm over the Northeastern Texas Panhandle became severe and moved into Northwest Oklahoma.  It was just to our south and basically moving right at us.  A Tornado Warning was issued, and we drove south a few miles so we could view the thunderstorm base.  When we first saw the storm base we saw a lot of scud that looked ominous, but we saw nothing tornadic.  There was some decent organization at times as media helicopters flew around, but still no tornadoes.

The storm seemed to always be in transition with fast development and then disorganization.  As it moved northeast through Harper County, we did see a very brief tornado to our west.
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There always seemed to be a lot happening and often more than one area of interest under the storm as it continued too move northeast.  As the storm approached the state line, it became much more organized and developed very strong rotation and upward motion, with some scud tags developing just a few hundred feet above the ground.  They would rise quickly, and rotate around a radius of a few hundred yards.  It was some of the most impressive motion that I have seen, but it never developed a condensation funnel or any typical visual clues of a tornado despite the strong very low-level rotation.

After a few minutes, this rotation became disorganized.  With poor road options, we left the storm for a bit to drive north into Kansas, then east to near Protection where we would be ahead of it.  As the storm approached, a tornado developed southwest of town and moved north or north-northeast.  While this tornado was in the occluded part of the storm, another tornado developed to its east, closer to (but still west) of town.  Although the second tornado looked like it was going to develop into a large tornado, the visual contact with the ground was brief and it looked like it was constantly in an incipient tornado stage.  Meanwhile, the tornado in the initial area of the storm continued, even with the second area of interest continuing to try to organize to its east.  The second area also continued to develop visible funnels and perhaps brief contact with the ground as we lost sight of the western tornado in the rain and darkness.  We followed the storm north of Protection, but did not have the best visibility with the growing darkness after sunset.

After the chase, the storm treated us to a nice lightning show which illuminated the small, but nicely shaped updraft.