Articles: Difference between revisions

Revision as of 10:48, 2 April 2010

Featured Articles

These are examples of CSU-CHILL data selected from meteorologically interesting cases. The data plots generally have had some basic level of post-processing applied (i.e., calculations of derived fields, utilization of specialized base maps, etc.)

Radar: Tomorrow's Raingauge: Examples of weather radar technology in the early 1950's are presented in a digital video version of a motion picture film produced at the Illinois State Water Survey.

Brightband observations: 12 September 2009: RHI scans were made through stratiform rain with embedded convective showers. A well-defined radar brightband pattern was evident. The brightband was depressed to lower heights and became thicker in the rain shower areas.

Outflow development beneath a thunderstorm complex: 8 July 2008: The CSU-CHILL radar conducted continuous RHI volume scans through an area of thunderstorms during the afternoon hours of 8 July 2008. An ~14 minute time segment of these RHI's captured the descent of a rear-inflow radial velocity feature.

Time lapse photography of a cumulonimbus cloud: 2 July 2009: Digital photographs of an area of developing thunderstorms were taken at two minute time intervals. While the photography was in progress, the CSU-CHILL radar made RHI scans through the associated echo region. A positive $Z_{dr}$ column was observed in the vigorously growing clouds.

Dual-Doppler snapshot of a tornadic thunderstorm: 22 May 2008: Horizontal wind fields are synthesized from radial velocities observed by the CSU-CHILL and KCYS WSR-88D radars.

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Technical Notes

These articles deal with engineering topics of interest to users of CSU-CHILL data.

X-band Solid State Transmitter Monitor User's Guide (TN-008): User's Guide to the solid-state X-band transmitter monitor developed at CSU-CHILL.

Clock Generator User's Guide (TN-007): User's Guide to the programmable clock-generator design developed at CSU-CHILL.

Frequency Synthesizer User's Guide (TN-006): User's Guide to the programmable Frequency Synthesizer design developed at CSU-CHILL.

Radar Echoes from Wind Turbines (TN-004): Wind Turbines have become increasingly common in recent years. Their Doppler spectral characteristics are presented, along with an animation showing the repetitive patterns present in the turbine spectra. An audio presentation of the same data is also available, clearly showing the temporal variation of the echo. A brief discussion on the effects of wind turbine proliferation on radar meteorology is also presented.

Coherent Leakage (TN-003): This is a short discussion on coherent leakage, discussing the various causes of coherent leakage in weather radar receivers. Some troubleshooting tips are also provided.

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Recent Observations

More Recent Observations articles

Ongoing Data Analysis

20070629 Time Variations in the Characteristics of Convective Precipitation

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Casebook

The CSU-CHILL Casebook contains summaries of CHILL operations, categorized by keywords, project names and by date of operation.

Casebook Archives

@@ Line 17: / Line 17: @@
 ;[[Dual-Doppler snapshot of a tornadic thunderstorm: 22 May 2008]]
 :Horizontal wind fields are synthesized from radial velocities observed by the CSU-CHILL and KCYS WSR-88D radars.
-;[[Development of hail and heavy rain signatures in a thunderstorm: 29 June 2007]]
-:Low elevation PPI scans through thunderstorm precipitation show the development of a low Zdr hail area.  Positive Kdp magnitudes do not increase as the hail develops.
-;[[High time resolution RHI scans through a developing thunderstorm: 30 May 2009]]
-:During an Research Experience for Undergraduates (REU) project, CSU-CHILL RHI scans were visually directed towards developing cumulus clouds.  Time lapse RHI images of reflectivity radial velocity, and differential reflectivity at 75 second (1:15) intervals are shown.
-;[[An example of reflectivity-based rain rate over-estimation due to ice hydrometeor contamination on 18 August 2009]]
-:Thunderstorm precipitation with reflectivity levels of 45 - 50 dBZ and specific propagation differential phase values of ~0.5 deg / km was observed over the Denver area.  Plots demonstrating the resultant differences between the rain rate estimates calculated from the reflectivity and Kdp data are shown.
-;[[Macroburst radial velocity pattern on 23 July 2009]]
-:A divergent radial velocity pattern was observed in a low elevation PPI scan through a thunderstorm precipitation shaft on 23 July 2009.
-;[[High rain rates at Denver International Airport on 23 June 2009]]
-:The CSU-CHILL radar detected large specific differential propagation phase (Kdp) values over Denver International Airport while heavy rain was being observed there on 23 June 2009.
-;[[Melting hail signatures on 8 July 2008]]
-:Dual polarization patterns associated with melting hail are shown in an RHI scan through the lower portion of a thunderstorm precipitation shaft.
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