Cloud over southeastern Wisconsin
- This topic has 5 replies, 4 voices, and was last updated 2 years, 11 months ago by
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Ahh, great finds, Hans–very cool to see this from other angles! No tornado, but there was a destructive wind later associated with this storm, which was headed to the NE. My dad spotted the cloud at Johnson Creek, and the destruction, associated with the straight-line wind, happened somewhere south of Watertown, within 15 miles of Johnson Creek.
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I second Greg. Stunning picture.
The book Extraordinary Weather by Richard Hamblyn (a CAS Member) 2012 in association with the UK Meteorological Office (it acknowledges Gavin Pretor-Pinney on page 143) has a picture of a Wall Cloud on page 21 from NOAA as above (but not the picture in the link). The text says
” A regular feature of supercell storm systems, wall clouds (sometimes known as ‘pedestal clouds’) are isolated lowerings (sic) attached to the bases of storm clouds. They develop when rain-cooled air is pulled towards the mesocyclone (the supercell’s violently rotating core), its moisture condensing at a lower level than the principal cloud itself…..” -
Thank you all so much! This is really interesting, and requires me to re-examine my own definition of a “wall” cloud. Appreciate your help and enthusiasm…my dad, who spotted the cloud, e-mailed back and forth with our local weather service station, but they weren’t as excited as we were. It’s wonderful to get such engaged responses, and to learn a little more about this formation.
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