The Storm Prediction Center (SPC) Mesoscale Discussions (MDs or MCDS) Web Service consist of polygon layers that displays SPC issued Mesoscale Discussions (MDs or MCDs) that focus on severe thunderstorm potential over the continental U.S. for the next 6 hours with an emphasis on the first 1-3 hours. SPC also issues MDs for mesoscale aspects of hazardous winter weather events including heavy snow, blizzards, and freezing rain. All MDs contain an area, affected line, concerning line, valid time, a paragraph for a summary, and a paragraph for a technical discussion, along with a graphical depiction of the highlighted area.

Update Frequency: Within 15 minutes a MD or MCD is issued

Link to graphical web page: https://www.spc.noaa.gov/products/md/

Link to data download (shapefile): https://www.spc.noaa.gov/products/md/ActiveMD.kmz

Questions/Concerns about the service, please contact the DISS GIS team

Time Information:

This service is not time enabled