KDLH Dual-Pol Radar Upgrade
  

Throughout the year of 2012, the entire fleet of National Weather Service WSR-88D (Weather Surveillance Radar, 1988 Doppler) Radars will undergo a major software and hardware upgrade. This upgrade will include the addition of state of the art dual-polarization technology, or "dual-pol".
 
The Dual-Pol Technology upgrade of the KDLH radar is in the final testing phase. Radar data is expected to become available Monday afternoon.  

 
The new dual-pol capabilities will greatly enhance the weather radar data by providing the ability to collect information on the vertical axis, in addition to horizontal axis. The new technology will provide new radar variables, such as Differential Reflectivity and Correlation Coefficient. The new dual-pol data will be in addition to the current radar products which will not be affected by the software upgrade. 
 
Example of Dual-Pol Radar Data

Two of the new Dual-Polarization Variables: 

  • Differential Reflectivity (ZDR) – The differential reflectivity is a ratio of the reflected horizontal and vertical power returns. Among other things, it is a good indicator of drop shape which can assist the meteorologists in estimating the average drop size.
  • Correlation Coefficient – A statistical correlation between the reflected horizontal and vertical power returns. It is a good indicator of regions where there is a mixture of precipitation types, such as rain and snow, or rain and hail.
Training
In support of this technology upgrade, the NWS Warning Decsion Training Branch has developed on-line training to help NWS partners learn about the system changes and provide ideas on how they might effectively incorporate these new data into their decision making process. Two different training paths are available depending on your meteorology background:
How Can I view the Dual-Pol Data?
The National Weather Service has a central collection of radar products. While we currently only display four of those products on our local radar webpage (Base Reflectivity, Composite Reflectivity, One-Hour Precipitation, and Storm Total Precipitation), you can receive all products through a "multicast" flow or via standard anonymous FTP from the Gateway file servers. Information on the other products and the type of computer equipment you need to receive the products can be found at the Radar Product Central Collection/Distribution Service webpage.
 
Additional Information
If you have further questions please contact Dan Miller
 
 

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