Military installations, airports, sporting events, and other
facilities curtail operations when cloud-to-ground (CG) lightning
is present. The National Lightning Detection Network records
approximately 20 million lightning flashes each year (Orville and
Huffines 1999). Because of the frequency and random nature of CG
lightning more people become casualties to lightning each year than
to either tornadoes or hurricanes. Lightning specific warning
criteria are not standard and appear to have evolved over time as a
result of increasing the distance in response to lightning
incidents until the proper balance between threat and impact were
achieved, rather than through research and lightning data analysis.
This research effort attempted to quantify what constitutes a safe
distance when lightning is present. The method used in this
research project groups lightning flashes into clusters using
spatial and temporal constraints. However, not all flashes meet the
time and distance criteria for clustering and remained outside of
the grouped flashes and as such are identified as isolated flashes.
These isolated flashes are outliers in the data set, but are
precisely the flashes that prove most dangerous. For this reason
not only were the distances between each flash and cluster center
studied, but also the distances between each isolated flash and its
nearest neighboring flash. Distributions for both distances were
studied for the continental U.S. by season.
General
Imprint: |
Biblioscholar
|
Country of origin: |
United States |
Release date: |
December 2012 |
First published: |
December 2012 |
Authors: |
Tamara L. Parsons
|
Dimensions: |
246 x 189 x 5mm (L x W x T) |
Format: |
Paperback - Trade
|
Pages: |
92 |
ISBN-13: |
978-1-288-41491-8 |
Categories: |
Books >
Social sciences >
Education >
General
|
LSN: |
1-288-41491-9 |
Barcode: |
9781288414918 |
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