NASA Logo

NTRS

NTRS - NASA Technical Reports Server

Back to Results
Why do Tornados and Hail Storms Rest on Weekends?When anthropogenic aerosols over the eastern USA during summertime are at their weekly mid-week peak, tornado and hail storm activity there is also near its weekly maximum. The weekly cycle in storm activity is statistically significant and unlikely to be due to natural variability. 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, delaying precipitation-forming processes and their evaporation, and hence affecting cloud dynamics.
Document ID
20110015368
Document Type
Preprint (Draft being sent to journal)
Authors
Rosenfeld, Daniel (Hebrew Univ. Jerusalem, Israel)
Bell, Thomas L. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Date Acquired
August 25, 2013
Publication Date
January 1, 2010
Subject Category
Meteorology and Climatology
Report/Patent Number
GSFC.JA.4765.2011
Funding Number(s)
CONTRACT_GRANT: NNX07Al84C
Distribution Limits
Public
Copyright
Public Use Permitted.

Available Downloads

NameType 20110015368.pdf STI