SPC Severe Weather Outlooks to Change on October 22nd

The SPC will revise Day 1 through Day 3 categorical severe weather outlooks to better communicate risk and describe the likelihood of severe weather. Format changes will also improve the use of SPC severe weather forecasts for customers who incorporate SPC outlooks into GIS systems. Details on the new outlooks can be found at http://www.spc.noaa.gov/exper/dy1-3example/.

 

Below is an example of a proposed Public Severe Weather Graphic that includes the new categories. This graphic is enlarged on the area of greatest risk and designed for use by media partners and social media.

 

A primary goal of these changes is to bring better consistency to the risks communicated in SPC outlooks, from the short-range Day 1 outlooks through the extended range Day 4-8 outlooks. The changes are based on customer feedback and to better meet their needs. Here is an example of the proposed Day 4-8 outlook with 15% and 30% probability areas:

 

The latest SPC Day 1 Severe Weather Outlook can be found here.



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