Hi,
Every so often SkyDemon paints a CTA from sea level to FL140, extending about 15 mile radius. Tonight it appeared as notamed from 2100-2110. I can't work out where it's coming from, as it's not listed in the normal notams. Is it spurious?
Thanks in advance. PS. I have a screen shot of today's appearance.

All NOTAMs are basically big circles of influence. You have to read the NOTAM text to find out what is going on. They have created a circle in this case which contains the pieces of airspace affected by it.