This map of pressure change over a two hour period may be one of the keys to an area that developed some strong storms today. Note the drop of 0.04 on a dashed blue line through SW MO and western sections of AR. These dashed blue lines are called isallobars, which are lines of equal pressure change. This area may have contained a pre-frontal trough or perhaps a washed out outflow boundary, providing a focal point and a zone of convergence to initiate convection.

This map, again from the 2:00 pm time frame, shows a plume of helicity values over 100 stretching through sections of Franklin, Johnson and Logan counties. Values are high as well in SW MO. High helicity values correlate well with a storms likely hood of rotating.

1st shot of updraft showing signs of rotation from Muldrow, OK looking North


Went north of Muldrow and after got through the mtns came out to this, ...just before we saw a funnel snake down and pull back up. Wall cloud is very rain wrapped at this point.

Storm underwent rapid transition out of back edge of rain. Could be a funnel on right side there but can't confirm with pics or video.