|A supercell thunderstorm developed over eastern Iowa county and moved
east into western Dane County. Once it moved past the village of Blue
Mounds, it turned slightly right and headed east/southeast.
It spawned a
minimal tornado, rated as F0 - weak category, probably no more than
45-55 mph winds) just south of the Hwy 18/151, and west/southwest of
A storm chaser team was positioned southeast of Verona on
County Hwy M, and they managed to video tape and photograph the weak
tornado. No structural damage was noted, however minor amounts of dust
and dirt were ingested into the ground circulation under the wall cloud,
and a condensation funnel was observed for a short time. This supercell
eventually moved through the Oregon and Stoughton areas, but only a
rotating wall cloud was noted after it moved east of Verona.