Okay, a couple little updates today.
Going back and looking at climatological data, I found that the actual lowest temperature in the lower 48 (at least) on December 15th was -39ºF at a COOP observing station along the Canadian Border (6N Simpson, Montana).
On the 16th, both Harlem and Chinook, Montana reached -35ºF (as well as Longville Minnesota as I previously reported.
And finally, here are some not-so-cold things to consider...
In the tropics:
04S (South Indian Ocean)
40kts / 993mb
Click for larger image. Satellite image used with permission; courtesy of IPS Meteostar Inc.
And a giant explosion on the sun. (posted by someone over on Storm Track)
Thanks for shopping,
2019 Great Plains chase trip 1 - March 22-24
26 minutes ago