Re: Can mega-hurricanes happen if multiple storms join up with each other?

Val,

Yes, hurricanes can "join" so to speak.  There's a phenomenon known as the 
"Fujiwhara Effect", which was first shown experimentally in 1921.  It's the 
interaction between two, three, or four tropical cyclones within 1500 km of 
each other.  These tropical cyclones either attract or repel each other.

For more information, click on "Fujiwhara Effect" at:

http://tgsv5.nws.noaa.gov/er/box/usatodaywx.htm

Hope this helps,

G. Keith Little
Senior Software Engineer
Federated Software group
St. Louis, Missouri