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Roll Cloud
- Duluth, Lester River, 1998
This baby came rolling over the hills of
Duluth as I was driving home from work. I drove pretty
fast along London Road to stay ahead of it and caught
it just as it hit Lake Superior. Roll clouds are completely
unattached from a parent storm cloud. This is what makes
it distinctly different looking compared to a wall cloud
or a shelf cloud. A roll cloud is long and tubular and
appears to be "rolling" along a horizontal axis.
Although you may think it looks like a tornado turned
horizontal, it is not associated with tornadoes at all.
Roll clouds form from outflow of the primary storm pressure-change
zone. Roll clouds are pretty rare. They are most often
associated with a gust front and do appear to roll or
tumble. The wind behind this one was about 50 mph!
October 12, 2005 |
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