Casebook 18 August 2003: Difference between revisions
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==CSU-CHILL Casebook: 18 August, 2003== | ==CSU-CHILL Casebook: 18 August, 2003== | ||
A thunderstorm briefly became severe near the foothills west-southwest of Loveland Colorado during the afternoon of 18 August 2003. The CSU-CHILL radar made an RHI scan through the | A thunderstorm briefly became severe near the foothills west-southwest of Loveland Colorado during the afternoon of 18 August 2003. The CSU-CHILL radar made an RHI scan through the core of this storm at 2010:32 UTC. (See VCHILL example below.) The <math>Z_{dr}</math> field contains a bright band in the low reflectivity elevated echo layer near the 20 km range point. In the high reflectivity thunderstorm core, the transition from positive to near 0 dB <math>Z_{dr}</math> values at the surface at a range of 58 km indicates an increasing hail fraction in the precipitation. Finally, a three-body scattering signature (distinctly negative <math>Z_{dr}</math> at low elevations changing to large positive values at higher elevation angles) can be seen at the far range end of the thunderstorm. (Note: Thresholding should be selected OFF under the VCHILL Filters tab to make the three body scattering pattern visible.) | ||
[http://chill.colostate.edu/java/vchill.php?sweep=xlab.chill.colostate.edu:2510*/dsk/dnf/data/2003/08/18/%20DIR*CHL20030818_201032%20MPRHI1%20RHI*Sweep%2003¢er=0.,0.&range=75.&plot=ZDR example in VCHILL] | |||
[[Casebook 31 July 2003|prev]] [[Casebook 22 September 2003|next]] | [[Casebook 31 July 2003|prev]] [[Casebook 22 September 2003|next]] | ||
[[Category:Casebook|20030818]] | [[Category:Casebook|20030818]] | ||
[[Category:Hail]] | [[Category:Hail|20030818]] | ||
[[Category:Bright Band]] | [[Category:Bright Band|20030818]] | ||
[[Category:Three Body Scattering|20030818]] | |||
Latest revision as of 16:01, 25 December 2007
CSU-CHILL Casebook: 18 August, 2003
A thunderstorm briefly became severe near the foothills west-southwest of Loveland Colorado during the afternoon of 18 August 2003. The CSU-CHILL radar made an RHI scan through the core of this storm at 2010:32 UTC. (See VCHILL example below.) The field contains a bright band in the low reflectivity elevated echo layer near the 20 km range point. In the high reflectivity thunderstorm core, the transition from positive to near 0 dB values at the surface at a range of 58 km indicates an increasing hail fraction in the precipitation. Finally, a three-body scattering signature (distinctly negative at low elevations changing to large positive values at higher elevation angles) can be seen at the far range end of the thunderstorm. (Note: Thresholding should be selected OFF under the VCHILL Filters tab to make the three body scattering pattern visible.)
