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CHANGE

September 8, 1999

visible imagery

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Two visible GOES (geostationary) satellite images from September 8, 1999 are shown here. The upper image is from 1315Z (1:15pm Greenwich Time or 9:15am EDT); the bottom image is from (7:15pm Greenwich Time or 3:15pm EDT). Although there are many interesting features on these images, let's key on some of the changes. 1 - Most notable is that the terminator (demarcation line between day and night) has moved from the field of view during the 6-hour period. 2 - The cold front (curved line of clouds over the southern Great Lakes region) has moved to the east during the 6-hour period. Lake Michigan, which was covered by clouds in the morning, is now almost cloud-free. It is easy to see this feature because land and water reflect sunlight so differently. 3 - The region of low clouds (stratus and/or fog) to the southwest (lower left) of the cold front has disappeared (actually evaporated) during the 6-hour period. We know it is a low level layered cloud because it lacks character and it appears to be beneath some other clouds nearby. 4 - Cumulus-type clouds (puffy clouds) have formed over Wisconsin (west of Lake Michigan) during the day. Also a large round thunderstorm (and some smaller thunderstorms) have formed over the middle Atlantic states; they weren't there earlier in the day. 5 - By comparing these images, what else seems to have changed? If you wish, please send your answers to change@weatherworks.com. We may not be able to respond to each e-mail message we receive, but we will look at your answers and update this page, as appropriate. Thanks!!

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