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Location: UFOUpDatesList.Com > 2011 > Dec > Dec 23

Tornado And Hail Frequency Vs. Day Of The Week

From: Martin Shough <parcellular.nul>
Date: Fri, 23 Dec 2011 09:51:21 -0000
Archived: Fri, 23 Dec 2011 10:59:16 -0500
Subject: Tornado And Hail Frequency Vs. Day Of The Week


Dear List

There have been some claims over the years that types of UFO
reporting might vary with the day of the week. I recall in
particular John Keel's "Wednesday phenomenon". If this was ever
rigorously tested I'm not aware of it, nevertheless it's
intriguing that tornado and hail activity does proveably follow
such a law and that there may be a mechanism to explain why.

Perhaps other types of atmospheric phenomena could have a
similar anthropogenic signature?

-----

Source: PhysOrg.Com

http://tinyurl.com/c5a653v

December 22, 2011


JOURNAL OF GEOPHYSICAL RESEARCH, VOL. 116, D20211, 14 PP., 2011
doi:10.1029/2011JD016214

Abstract

This study shows for the first time statistical evidence that
when anthropogenic aerosols over the eastern United States
during summertime are at their weekly mid-week peak, tornado and
hailstorm activity there is also near its weekly maximum. The
weekly cycle in summertime storm activity for 1995-2009 was
found to be statistically significant and unlikely to be due to
natural variability. It correlates well with previously observed
weekly cycles of other measures of storm activity. The pattern
of variability supports the hypothesis that air pollution
aerosols invigorate deep convective clouds in a moist, unstable
atmosphere, to the extent of inducing production of large
hailstones and tornados. This is caused by the effect of
aerosols on cloud drop nucleation, making cloud drops smaller
and hydrometeors larger. According to simulations, the larger
ice hydrometeors contribute to more hail. The reduced
evaporation from the larger hydrometeors produces weaker cold
pools. Simulations have shown that too cold and fast-expanding
pools inhibit the formation of tornados. The statistical
observations suggest that this might be the mechanism by which
the weekly modulation in pollution aerosols is causing the
weekly cycle in severe convective storms during summer over the
eastern United States. Although we focus here on the role of
aerosols, they are not a primary atmospheric driver of tornados
and hailstorms but rather modulate them in certain conditions.

-----


Martin Shough



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