Executive Correspondence – Letter dtd 07/29/2005 to Chairman Principi from Senators Tim Johnson, John Thune, and Representative Stephanie Herseth Page: 4 of 20
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Executive Correspondence
DCN 5789
Severe Weather Hazard Frequency Comparison
Ellsworth AFB vs. Dyess AFB
Introduction:
Statistics based on severe weather reports have been compiled into map form at the
National Severe Storms Laboratory. See http://www.nssl.noaa.zov/hazard/. A review of
these statistics shows that in spring and summer the Dyess AFB area experiences much
more frequent severe weather than the Ellsworth AFB area.
The National Weather Service classifies a storm as severe if it produces high winds, hail,
or tornadoes. Often the same storm will produce all three of these phenomena. A storm is
classified as severe if straight-line winds exceed 50 kts (58 mph), if hail size exceeds %",
or if a tornado of any severity occurs. Damage to aircraft and facilities on the ground, and
in the case of hail, to aircraft in flight, is likely when these criteria are met. At this time,
neither the dollar value of property losses, nor statistics on injuries and deaths, are
involved in classifying a stonrm as severe.
We review here statistics on the frequency of these severe storm phenomena, using charts
available at the above-referenced web site. These charts, unless otherwise stated, were
compiled LLsing storm reports from 1980-1999.
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Executive Correspondence – Letter dtd 07/29/2005 to Chairman Principi from Senators Tim Johnson, John Thune, and Representative Stephanie Herseth, letter, July 30, 2005; (https://digital.library.unt.edu/ark:/67531/metadc19071/m1/4/: accessed April 24, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.