Practically Perfect Hindcast Archive 1979-2023

(updated 1 November 2024 to include 2023 data)

It is recommended that you read https://journals.ametsoc.org/doi/abs/10.1175/BAMS-D-19-0321.1 before using this data.

  • Practically perfect values (0-100%) were calculated on the NCEP 211 grid (80-km) following the formal definition used at SPC. This involves using a 1.5 σ kernel as described in the paper above.

  • Archived fields are available for tornado, damaging convective wind gusts, and large hail. Significant (i.e., hatched) fields are also available.

A plotting example using a Python Jupyter Notebook is available here.

 

Download Tornado Download Hail Download Wind
     
Download Significant Tornado Download Significant Hail Download Significant Wind

Download Total Severe   |   Download Total Significant Severe

Files are approximately 759 MB each

If using this data, please cite:

Gensini V. A. , A. M. Haberlie, and P. T. Marsh, 2020: Practically perfect hindcasts of severe convective storms. Bull. Amer. Meteor. Soc., DOI: 10.1175/BAMS-D-19-0321.1

If you are interested in obtaining data prior to 1979, or a "modified" version of the practically perfect hindcasts, please contact me.
Send any questions to vgensini at niu dot edu

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