Casebook 22 July 2004: Difference between revisions
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==CSU-CHILL Casebook: 22 July, 2004== | ==CSU-CHILL Casebook: 22 July, 2004== | ||
Around mid-day on 22 July 2004, thunderstorms began to develop over the area between metropolitan Denver and Denver International Airport. At 1855 UTC a spotter report of 1.25 inch diameter hail was received from Commerce City (near azimuth 195 degrees / range 71 km). Shortly before this report, the storm in the Commerce City area was displaying polarimetric radar indications of hail. (Intense (> ~55 dBZ) reflectivity levels in combination with ~0 dB <math>Z_{dr}</math> values. See the VCHILL | Around mid-day on 22 July 2004, thunderstorms began to develop over the area between metropolitan Denver and Denver International Airport. At 1855 UTC a spotter report of 1.25 inch diameter hail was received from Commerce City (near azimuth 195 degrees / range 71 km). Shortly before this report, the storm in the Commerce City area was displaying polarimetric radar indications of hail. (Intense (> ~55 dBZ) reflectivity levels in combination with ~0 dB <math>Z_{dr}</math> values. See the VCHILL examples below.) The positive <math>Z_{dr}</math> levels in the neighboring storms indicated that they contained more preferentially-oriented hydrometeors. (i.e., like oblate raindrops; small hailstones with a stabilizing meltwater coating, etc.) | ||
[http://chill.colostate.edu/java/vchill.php?sweep=xlab.chill.colostate.edu:2510*/dsk/dnf/data/2004/07/22/%20DIR*CHL20040722_184235%20PCKSEC%20PPI*Sweep%2001¢er=- | [http://chill.colostate.edu/java/vchill.php?sweep=xlab.chill.colostate.edu:2510*/dsk/dnf/data/2004/07/22/%20DIR*CHL20040722_184235%20PCKSEC%20PPI*Sweep%2001¢er=-30.,-60.&range=61.&plot=dBZ example in VCHILL] | ||
[http://chill.colostate.edu/java/vchill.php?sweep=xlab.chill.colostate.edu:2510*/dsk/dnf/data/2004/07/22/%20DIR*CHL20040722_184235%20PCKSEC%20PPI*Sweep%2001¢er=-30.,-60.&range=61.&plot=ZDR example in VCHILL] | |||
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[[Category:Casebook|20040722]] | [[Category:Casebook|20040722]] | ||
[[Category:Hail|20040722]] | [[Category:Hail|20040722]] | ||
Latest revision as of 06:23, 8 January 2008
CSU-CHILL Casebook: 22 July, 2004
Around mid-day on 22 July 2004, thunderstorms began to develop over the area between metropolitan Denver and Denver International Airport. At 1855 UTC a spotter report of 1.25 inch diameter hail was received from Commerce City (near azimuth 195 degrees / range 71 km). Shortly before this report, the storm in the Commerce City area was displaying polarimetric radar indications of hail. (Intense (> ~55 dBZ) reflectivity levels in combination with ~0 dB values. See the VCHILL examples below.) The positive levels in the neighboring storms indicated that they contained more preferentially-oriented hydrometeors. (i.e., like oblate raindrops; small hailstones with a stabilizing meltwater coating, etc.)
