The IEM curates a wide variety of datasets, many of which the reason to curate is that they are useful and also extremely difficult to find online archives of. Due to my laziness, some of these datasets never saw the light of day with regards to a download option on this website. Today, I have fixed that situation for three related datasets.

1. SPC Watch Polygons
2. SPC Mesocale Convective Discussion (MCD) Polygons
3. WPC Mesoscale Precipitation Discussion (MPD) Polygons

I hope folks find these useful and end-user feedback is always welcome. Thanks for your interest and usage of the IEM!