The image at left shows the visible satellite at 21 UTC Wednesday, February 18 2009. Clicking on the image will link you to a a visible satellite loop of the entire afternoon after 17Z.The loop shows thin, scattered cloud moving in early from the west. Later in the afternoon, a thicker, more extensive wave of cloud moves in, also from the west. This wave of cloud is the one that brought with it light snow.
The second image shows an IR image for the same time. It links to a loop of IR imagery. It confirms the double wave of cloud, and that the second wave appears to be more extensive. In addition, comparing the cloud shading to the temperature scale at the bottom scale at the bottom shows that the cloud tops have a temperature of about -40 C.
Current and archived imagery can be found at the UCAR's satellite page.
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