Radar View of Europa's Life cycle

Radar images taken at two points in the life cycle of the snowband off Lake Erie. The left image taken at 1058 GMT January 4th shows the snowband pummeling the suburbs to the north of Buffalo, while the image at the right, taken at 1329 GMT January 4th shows how the band drifted about 10 miles south in a little over 2 hours. During this 2-hour period the band affected two different segments of the population. While a 1/2 million people in the northtowns were getting blasted, the southtowns had nearly clear skies, but just 2 hours later the conditions totally reversed themselves. Predicting weather at this scale is difficult to say the least, and it has a tremendous impact on the population. Satellite View of a Single-banded Storm

Here you can clearly see lake effect cloudbands off both Lakes Erie and Ontario. The image was at 1432 GMT, January 4th, 1999.