Casebook 23 April 2003: Difference between revisions

Latest revision as of 15:54, 25 December 2007

CSU-CHILL Casebook: 23 April, 2003

On this date a strong synoptic scale short wave affected northeastern Colorado; widespread rain showers and thunderstorms developed by mid-day local time. By early afternoon, one area of echo development was located over the CSU-CHILL radar site. The radial velocity pattern seen in the low elevation PPI scans implied that confluent flow was present in the immediate vicinity of the radar. The VCHILL link below shows the radial velocity configuration at 1927 UTC. Negative (inbound) radial velocity components exist around the majority (~250 degrees) of the 15 km range ring. This is a departure from the symmetric sine wave radial velocity that is observed in PPI scans through horizontally uniform wind fields.

example in VCHILL

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 ==CSU-CHILL Casebook: 23 April, 2003==
-Widespread precipitation developed during the late morning hours as a strong upper level trough moved over the area.  Small / soft hail was observed in some of the more intense convective precipitation cores.  A series of RHI sweeps were done through an area of thunderstorm outflow that was approaching the CHILL site at 1627:11 UTC.  These RHI's contain the elevated head circulation and the near-surface wind speed maximum within the cold airmass that are typical of relatively dense, cold air outflows.
+On this date a strong synoptic scale short wave affected northeastern Colorado; widespread rain showers and thunderstorms developed by mid-day local time.  By early afternoon, one area of echo development was located over the CSU-CHILL radar site.  The radial velocity pattern seen in the low elevation PPI scans implied that confluent flow was present in the immediate vicinity of the radar.  The VCHILL link below shows the radial velocity configuration at 1927 UTC.  Negative (inbound) radial velocity components exist around the majority (~250 degrees) of the 15 km range ring.  This is a departure from the symmetric sine wave radial velocity that is observed in PPI scans through horizontally uniform wind fields.
-[[Casebook 19 March 2003|prev]] [[Casebook 26 May 2003|next]]
+[http://chill.colostate.edu/java/vchill.php?sweep=xlab.chill.colostate.edu:2510*/dsk/dnf/data/2003/04/23/%20DIR*CHL20030423_192516%20ZDRSUR%20PPI*Sweep%2002&center=0.0,0.0&range=50.0&plot=VelLoad example in VCHILL]
+[[Casebook 19 March 2003|prev]] [[Casebook 9 May 2003|next]]
 [[Category:Casebook|20030423]]
-[[Category:Gust Front]]
+[[Category:Confluent VAD|20030423]]
-[[Category:small/soft hail]]