jdwilson1.eps 
  Noise spectral level (dB re $I_{ref}$) in the North
  Atlantic (a) and (b) and the Bay of Bengal (c) and (d) for $n=3$.
  (a) and (c) show the level as a function of range at a depth of 200
  m for 50, 400 and 3200 Hz frequencies. $L_V(\mbox{\boldmath $\rho$})
  = 10 \log{(V(\mbox{\boldmath $\rho$})/V_{ref})}$ is plotted for
  comparison where $V_{ref} = 5$ m/s.  $L_V=0$ is equivalent to $V=5$
  m/s and $L_V=10$ is equivalent to $V=50$ m/s. (b) and (d) show the
  level as a function of range and depth at 50 Hz.  In both waveguide
  environments the noise level closely follows the local wind speed.
  In the North Atlantic there is a convergence zone structure
  corresponding to sound that propagates from the hurricane's eye wall
  via refraction.  Note the convergence zone near the surface at a
  range of 257 km and the ray vertex depth of 4.7 km.

jdwilson2.jpg
  Hurricane Bonnie over the North Atlantic (1998).

jdwilson3.gif
  Hurricane Gert over the North Atlantic (1999).