Articles
From CSU-CHILL
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.)
- Varying outflow boundary motion: 11 September 2012
- Shower activity locally modified the motion of a pre-existing outflow boundary. The evolution of the boundary's motion is shown with a time lapse sequence of low elevation angle PPI images.
- X-Band attenuation example: 30 July 2012
- Regions of both stratiform and convective rain were observed during dual frequency test operations on 30 July 2012. Complete attenuation of the X-band / 3 cm wavelength signal occurred in an area of thunderstorm precipitation.
- Initial dual frequency observations of rain: 17 July 2012
- The CSU-CHILL dual frequency feedhorn was reinstalled on 5 July 2012. Preliminary plots of convective rain observed simultaneously at wavelengths of 11 and 3 cm have been prepared.
- Anvil level dual Doppler horizontal winds: 15 June 2012
- Winds synthesized from a dual Doppler volume scan done by the CSU-CHILL and Pawnee radars during the DC3 project are presented.
- Thunderstorm outflow and rainfall near the surface over Ft. Collins: 1 August 2011
- Radial velocity patterns and a rainfall time history plot are presented.
- Time lapse imagery of sky conditions near the Hewlett fire on 16 May 2012
- Digital camera images at one minute time intervals between 2020 and 2149 UTC taken from the CSU-CHILL radar site.
- Bounded weak echo region (BWER) example: 9 June 2011
- A marginally severe thunderstorm was observed with both PPI and RHI scans during the early UTC hours of 9 June 2011. Plots of the storm's three-dimensional structure have been generated.
- Damaging hailstorm at Cheyenne, WY: 12 July 2011
- A series of low elevation angle dual-polarization PPI scans were recorded by the CSU-CHILL radar as a severe hailstorm struck Cheyenne, WY. Time lapse loops of several radar data fields have been prepared.
- X-Band Kdp observations in a snowstorm: 3 February 2012
- Selected plots from dual frequency test operations conducted during a widespread snowstorm have been collected.
- Initial CSU-CHILL X-band operations: January 2012
- Example plots from test operations conducted with the dual frequency feed horn are presented.
- Thundersnow: 14 November 2009
- An echo line developed in association with a convergence zone generated by a westerly wind surge. This echo line produced observations of both snow and lightning at Denver International Airport. Locally reduced rhoHV and enhanced Ldr values were observed near the surface in the convective echo cores.
- Cold air surge at the surface: 2 November 2011
- A series of RHI scans were taken after a cold frontal passage. The increasing northerly surface winds following this frontal passage can be seen in a sequence of radial velocity images.
- Differential attenuation patterns: 19 August 2011
- Thunderstorm precipitation produced an axis of heavy rain that became radially-aligned with the CSU-CHILL radar. Differential attenuation along beam paths through this heavy rain caused a negative Zdr bias.
- Fine line passage at Denver International Airport: 30 August 2011
- The passage of a fine line echo coincided with the timing of a wind direction shift reported in the surface weather observations.
- Time lapse observations of outflow phenomena: 11 August 2011
- The low-level outflow patterns generated by rainshowers and weak thunderstorms are shown by animations of CHILL PPI plots and digital camera images.
- Damaging hailstorm at Denver International Airport: 13 July 2011
- Hail damage was inflicted on multiple aircraft at Denver International Airport during the evening hours of 13 July 2011. Selected CSU-CHILL dual-polarization data images from this storm have been generated.
- Polarimetric radar identification of frozen hydrometeors in thunderstorm precipitation: 6 August 2010
- The radar characteristics of individual range gates are used to place thunderstorm precipitation into one of three categories: (1) primarily rain; (2) mixed rain and hail; and (3) primarily hail. The areal coverage of these categories varies with time during a series of low elevation angle PPI sweeps through a thunderstorm.
- Evolution of radial velocity and rain rate fields in low elevation PPI sweeps of a thunderstorm: 30 July 2010
- A series of 1.5 degree elevation angle PPI scans document intensifying outflow and increasing rain rates as a storm reaches the CSU-CHILL radar site.
- An RHI scan through a severe thunderstorm: 21 June 2010
- A single RHI sweep through a severe thunderstorm reveals several signatures in the radial velocity and dual-polarization data fields.
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.
Recent Observations
- 20071211 Pawnee + KCYS test dual Doppler operations
- 20070423 Polarimetric Observations of a Mesocyclone
More Recent Observations articles
Ongoing Data Analysis
More Ongoing Data Analysis articles
Casebook
The CSU-CHILL Casebook contains summaries of CHILL operations, categorized by keywords, project names and by date of operation.
