Record-setting cold in Montana

October 25th, 2020 |

Suomi NPP VIIRS Infrared Window (11.45 µm) and Topography images [click to enlarge]

Suomi NPP VIIRS Infrared Window (11.45 µm) and Topography images [click to enlarge]

A toggle between Suomi NPP VIIRS Infrared Window (11.45 µm) and Topography images (above) showed a pocket of cold air exhibiting a minimum infrared brightness temperature of -35.2ºC (-31.4ºF) in the vicinity of Potomac, Montana at 0915 UTC (3:15 am MDT) on 25 October 2020 — the overnight low air temperature at Potomac was -29ºF, which turned out to be the coldest officially observed air temperature for this early in the winter season for the Lower 48 states.



According to the NOHRSC site, Potomac had a snow depth of 18 inches that morning (below).

Leave a Reply