Schematic of a cross-section through a <a href="https://en.wikipedia.org/wiki/microburst" class="extiw" title="en:microburst">microburst</a>
Public Domain since it is a U.S. Federal Government Agency
Federal Aviation Administration (<i>ed</i>. D. C. Beaudette)
<a rel="nofollow" class="external text" href="http://rgl.faa.gov/Regulatory_and_Guidance_Library/rgAdvisoryCircular.nsf/0/b3fb7dd636fb870b862569ba0068920b/%24FILE/AC00-54.pdf">United States Federal Aviation Administration</a>.