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24 July 2024, Author: Cameron R. Homeyer
GridRad-Severe data for 2022 and 2023 is being added to the archive this summer. At this time, 2022 data is already publicly available and generation of 2023 data is nearing completion. We expect 2023 data to be delivered to the public archive by the end of August. Future years will be added each summer.
3 May 2022, Author: Cameron R. Homeyer
In April 2022, it was discovered that data for years 2013-2019 was impacted by an ingest error that inadvertently excluded low-level velocity data from the GridRad binning procedure used for GridRad-Severe. This results in only 30-50% of available velocity data at altitudes at and below 4 km AMSL being retained in the GridRad-Severe volumes, affecting the radial velocity spectrum width, azimuthal shear, and radial divergence fields. Data for years 2013-2019 are currently being remade to resolve this issue and are expected to be archived by end of August/September 2022. Data for 2010-2012 are unaffected, as well as data in other GridRad collections. Please direct any questions to chomeyer@ou.edu.
*10 January 2023 Update*: All data has been reprocessed and delivered to the public archive. Data for 2020 and 2021 are currently being processed for delivery to the archive by March 2023.
3 February 2022, Author: Cameron R. Homeyer
Two new archives of GridRad data using V4.2 of our algorithm are now publicly available at the NCAR Research Data Archive. We have worked to update the website, providing access to the algorithm description document for V4.2, new software compatible with V4.2 files, and more. Please feel free to reach out to us with any questions you have about these new data. Thanks to the RDA for their continuing support.
If you use the GridRad data in your research, teaching, or for other purposes, please drop us a line and let us know how you are using it. Publications that use GridRad data should cite it as requested on the respective NCAR RDA web page for the archive you use.
28 March 2018, Author: Kenneth P. Bowman
Hourly GridRad analyses for the years 2015 and 2016 are now available from the NCAR Research Data Archive. Thanks to the RDA for their continuing support.
We hope to produce improved versions of the GridRad analysis and extend the analysis period forward and backward in time. Our best argument for continuing the GridRad analysis is to demonstrate its usefulness for research and teaching. So, if you use the GridRad data in your research or for other purposes, please drop us a line and let us know how you are using it. Publications that use GridRad data should cite it as requested on the NCAR RDA web page.
16 October 2017, Author: Kenneth P. Bowman
Hourly GridRad analyses are now available for the years 2013 and 2014 from the NCAR Research Data Archive.
Thanks again to the RDA for hosting the archive!
28 September 2017, Author: Cameron R. Homeyer
We are pleased to annouce public availability of preliminary dual-polarization GridRad version 4.0 analyses for Hurricane Harvey. The analysis period extends from 25 August 2017 at 00:00 UTC to 31 August 2017 at 00:00 UTC and covers a relatively small region encompassing most of Arkansas, Louisiana, Mississippi, Oklahoma, and Texas. The data may be viewed by using the latest release of GridRadViewer (version 1.02).
Links to download daily TAR files and animated GIFs of column-maximum *Reflectivity* from GridRadViewer are provided below.
2018-02-02 UPDATE: These data are no longer available since they are not compatible with the latest version of GridRad_Viewer.
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28 September 2017, Authors: Cameron R. Homeyer and Kenneth P. Bowman
In the coming months we plan to produce high-frequency (5 minute) GridRad analyses for selected high-impact weather events using an improved algorithm, currently referred to as Version 4.0. Those analyses will be made available for download here and will provide:
Once the new algorithm has been thoroughly tested, and assuming continued funding, we plan to reprocess the entire archive from at least 2004 onward using the new algorithm. The comprehensive GridRad products will be placed in the NCAR Research Data Archive when they become available.
We expect that the basis of the GridRad algorithm (weighted interpolation) will remain essentially the same, but details of the algorithm and data products will change with time. Planned changes include:
28 September 2017, Author: Kenneth P. Bowman
We are in the process of extending the hourly GridRad analyses to include the period 2013 through 2016 using the Version 3.1 algorithm. The analyses for 2013 and 2014 are complete and have been sent to NCAR. We will post an update when they are available in the NCAR Research Data Archive. Analyses for 2015 and 2016 should be available within a few months.