This photo (view to due west) shows the tornado at around 8:12
CDT and probably at maximum intensity, probably F2 to F3 based
upon the tremendous amount of debris. It was interesting to witness
corroboration of current thought on tornado formation, that is,
that mesocyclone-induced tornadoes develop when forward flank
(precip-related) outflow interacts with the rear-flank downdraft
on (in this case) the west side of mesocyclone.
Subsynoptic Analysis, 18 UTC, 5/28/94
The storm formed in a zone of surface confluence, ahead of a
dry-line to the west and an outflow boundary to the east. To
see a larger version of this, click here.