The long nights of winter can be ideal for the formation of fog. Clear, calm conditions are conducive to strong radiational cooling, and if the cooling occurs over a moist surface, cooling to the dewpoint is likely and fog may be a result. Once fog has formed over a location,... Read More
Occluded strong systems will occasionally display features that suggest the presence of a TROWAL, or a TROugh of Warm air ALoft. The midwestern snowstorm of 1 December 2006 was no exception. The pressure analysis below over the Infrared (channel 4 from GOES 12) data, which... Read More
It’s straightforward to differentiate between high clouds and the ground in infrared satellite imagery because of large temperature differences. As clouds get closer and closer to the surface, their temperature gets closer and closer to the surface temperature, and brightness temperature differences can become insignifcant. At night, when visible data... Read More
Parallax can mean different things in different sciences (See, for example, this link that describes how parallax is used to compute distances in astronomy), but in satellite meteorology, parallax is the apparent shift in an object’s position (away from the sub-satellite point) as a result of... Read More
