You Know It’s Cold When Satellite Imagery Makes the Frigid Ground Look Like a Giant, Oozing Cloud | The Weather Channel

Infrared satellite imagery is typically used by meteorologists to detect clouds, particularly at night when visible imagery isn’t available.It’s useful for measuring the intensity of thunderstorms and eyewall convection in tropical cyclones since it samples the temperature of clouds.

The colder the cloud top detected, the higher the cloud.In this case, while there were some clouds around the western Great Lakes and also with the initial cold front, there were mainly clear skies behind it

.So, much of what infrared imagery detected was the advance of this coldest air like a giant, oozing blob of viscous liquid spilling south.In the animation, the colder temperatures are shown with darker blue and green pixels, with the grayer shadings less cold.

Stare at that loop long enough and you’ll notice the blue pixels retreat a bit about halfway through the loop as air warmed slightly during the afternoon of Jan. 29, before the cold finally accelerated into the morning of Jan. 30.Zooming into the upper Midwest, there were some other neat features to point out.

Continue Reading Here:https://weather.com/science/weather-explainers/news/2019-01-31-cold-outbreak-satellite-images

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