Katrina

Big hurricane to hit New Orleans on Aug. 29, 2005. See Enhancing Satellite Weather Images for faux-coloring a greylevel weather map.

If you want to know the how many-th in the year a named storm is, here's the algorithm (including the Greek Alphabet extension first used in 2005):

 proc tropical'storm name {
   set n [lsearch {Alpha Beta Gamma Delta Epsilon Zeta Iota Kappa
        Lambda Mu Nu Xi Omikron Pi Rho Sigma Tau Ypsilon Phi 
        Chi Psi Omega} $name]
   if {$n>=0} {return [expr $n+22]}
   set n [lsearch {A B C D E F G H I J K L M N O P R S T V W} \
        [string index $name 0]]
   if {$n>=0} {return [expr $n+1]}
   error "$name is no tropical storm"
 } ;# RS

 % tropical'storm Katrina
 11
 % tropical'storm Rita
 17
 % tropical'storm Wilma
 21
 % tropical'storm Alpha
 22