Note: These Challenge Questions coincide with the Spring 2003 Reports Date: Tue May 20 2003 - 16:07:58 EDT
There had to be clear skies for optimal aerial surveys. In 2001 and 2003 it was clear. However, in 2002 there was a large amount of cloud cover. The surveys can't be done from the air when there is cloud cover which cuts down on the possible siting.
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