A comparison of GOES-12 and GOES-13 visible images centered near Rolla (station identifier KVIH) in southern Missouri (above) showed that widespread river valley fog was dissipating during the morning hours on 27 August 2008. Note the improvement in image-to-image navigation on the GOES-13 data (less “wobble” of the images), due... Read More

Areas of low cloudiness (such as stratus and/or fog) at night can be important aviation hazards, but they are sometimes difficult to identify simply by examining standard IR imagery. A comparison of 1-km resolution MODIS 11.0 µm and 4-km resolution GOES-12 10.7 µm “IR window” images (above) does not give... Read More

Fog that formed in the Gulf of Maine on Tuesday July 8th developed when relatively moist air moved from the continent over the cooler ocean waters and was cooled from beneath by conduction to the dewpoint. In other words, Advection Fog.An obvious question arises from the loop: Why does the... Read More

Given the rather large satellite viewing angle (or “zenith angle”) of geostationary satellites positioned over the Equator, one would think that the imagery would not be of much value over places such as far northern Alaska. However, a forecast discussion issued by Fairbanks, Alaska mentioned the utility of GOES visible... Read More