Radiation fog across the Lower Mississippi Valley and Gulf Coast
![](https://cimss.ssec.wisc.edu/satellite-blog/images/2021/11/fog_mvfr-20211107_130117.png)
GOES-16 MVFR Probability, IFR Probability, Low IFR Probability, Cloud Thickness products, along with “Red” Visible (0.64 µm) images [click to play animated GIF | MP4]
This fog was forming due to optimal radiational cooling conditions — light winds, along with a general lack of cloud cover — beneath a ridge of high pressure over that region (below). Surface air temperatures dropped into the 30s and 40s F across much of the area where this fog formed.