Observations of Tornadogenesis using a mobile, phased-array, doppler radar
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Authors
Bluestein, Howard B.
French, Michael
Popstefanija, Ivan
Bluth, Robert
Knorr, Jeffrey
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Date of Issue
2009
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Abstract
Tornadoes and many severe convective
storms evolve on very short time scales (~ 10 s),
owing to very high horizontal wind speeds and
vertical velocities. This paper documents the
formation of a tornado in the U. S. using a
mobile, rapidly scanning, Doppler radar. This
radar, the MWR-05XP (Meteorological Weather
Radar, 2005, X-band, Phased Array),
electronically scans in elevation and azimuth
over limited sectors, and mechanically in
azimuth at high speed. While the radar scans
electronically in elevation, the attitude of its
beam is held nearly fixed in space because it
electronically back scans in azimuth at the same
rate as it mechanically scans. Back scanning in
azimuth is accomplished by frequency hopping,
while scanning in elevation is accomplished by
changing the phase delay.
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This publication is a work of the U.S. Government as defined in Title 17, United States Code, Section 101. Copyright protection is not available for this work in the United States.