Casebook 29 July 2003: Difference between revisions
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==CSU-CHILL Casebook: 29 July, 2003== | ==CSU-CHILL Casebook: 29 July, 2003== | ||
Scattered thunderstorms were present in the greater Denver area during the afternoon hours of 29 July 2003. In the southeast azimuth quadrant of the CSU-CHILL radar, the nearest thunderstorm activity was located beyond the radar's unambiguous ("first trip") range of ~150 km. The range-aliased ("second trip") presentation of these distant storms appeared as radially-elongated echoes centered ~ 60 km southeast of CHILL. (See VCHILL link below.) In addition to their narrow shapes, the range-aliased echoes have velocity and differential propagation phase characteristics that are quite different from the neighboring first-trip echoes. Also, the second trip echoes quickly disappear with increasing elevation angle as the antenna's main beam overshoots the tops of the distant storms. | Scattered thunderstorms were present in the greater Denver area during the afternoon hours of 29 July 2003. In the southeast azimuth quadrant of the CSU-CHILL radar, the nearest thunderstorm activity was located beyond the radar's unambiguous ("first trip") range of ~150 km. The range-aliased ("second trip") presentation of these distant storms appeared as radially-elongated echoes centered ~ 60 km southeast of CHILL. (See VCHILL link below.) In addition to their narrow shapes, the range-aliased echoes have velocity and differential propagation phase (<math>\psi_{dp}</math>) characteristics that are quite different from the neighboring first-trip echoes. Also, the second trip echoes quickly disappear with increasing elevation angle as the antenna's main beam overshoots the tops of the distant storms. | ||
[http://chill.colostate.edu/java/vchill.php?sweep=xlab.chill.colostate.edu:2510*/dsk/dnf/data/2003/07/29/%20DIR*CHL20030729_222803%20COMSEC%20PPI*Sweep%2001¢er=60.,-80.&range=80.&plot=dBZ example in VCHILL] | [http://chill.colostate.edu/java/vchill.php?sweep=xlab.chill.colostate.edu:2510*/dsk/dnf/data/2003/07/29/%20DIR*CHL20030729_222803%20COMSEC%20PPI*Sweep%2001¢er=60.,-80.&range=80.&plot=dBZ example in VCHILL] | ||
Revision as of 08:00, 23 December 2007
CSU-CHILL Casebook: 29 July, 2003
Scattered thunderstorms were present in the greater Denver area during the afternoon hours of 29 July 2003. In the southeast azimuth quadrant of the CSU-CHILL radar, the nearest thunderstorm activity was located beyond the radar's unambiguous ("first trip") range of ~150 km. The range-aliased ("second trip") presentation of these distant storms appeared as radially-elongated echoes centered ~ 60 km southeast of CHILL. (See VCHILL link below.) In addition to their narrow shapes, the range-aliased echoes have velocity and differential propagation phase () characteristics that are quite different from the neighboring first-trip echoes. Also, the second trip echoes quickly disappear with increasing elevation angle as the antenna's main beam overshoots the tops of the distant storms.
