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

Re: Tornado And Hail Frequency Vs. Day Of The Week

From: Don Ledger <dledger.nul>
Date: Fri, 23 Dec 2011 13:09:12 -0400
Archived: Fri, 23 Dec 2011 12:45:07 -0500
Subject: Re: Tornado And Hail Frequency Vs. Day Of The Week

>From: Martin Shough <parcellular.nul>
>To: <post.nul>
>Date: Fri, 23 Dec 2011 09:51:21 -0000
>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


>December 22, 2011



>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

Probably more to do with the progress of weather across the
continent of North America. It nearly always rains on the
weekends in Nova Scotia in the summer. "What follows two days of
rain in Nova Scotia? Monday." Pain in the ass for weekend
pilots. I solved that by retiring. Simple solution; get together
and change the days of the week. Switch Wednesday to Saturday.

Clear skies on Wednesday-see more meteors, fireballs,

More like luck of the draw than any real solution, particularly
the psycho-social BS that often raises its unsupportable head.

Geography and meteorological influences more likely for the
tornados. UFOs a different matter.

Don Ledger

Listen to 'Strange Days... Indeed' - The PodCast



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