What are they flying to? Does weather have anything to do with where they fly? Do hosts and nectar sources have anything to do with where they fly? Do people have anything to do with where they go (I hear about all kinds of people taking their butterflies on vacation with them)? I've even heard of people on the east coast sending Monarchs to California. Many, many people don't know that it is against the law.
Speaking of weather:
A naturalist friend had Monarchs that she tagging on the east coast that were blown all the way to the coast of England during a tropical storm. The person who found them in England 5 days later contacted her through the information on the tags.
Aren't there violent storms during spring and fall migrations along the west coast of California and Mexico?
Herndon, VA (USA)
Take care of the small things....