Tom Kunich said:Everyone remember those moronic leftists screaming that global warming
was going to cause the worst hurricane seasons on record?
I suppose that the last two seasons which have been exceptionally mild
ought to demonstrate the scientific basis for their beliefs. That is -
absolutely nothing at all aside from the blind following of their
beloved leftists.
Doubting Thomas:
Here is a link to Emmanuel's Nature paper on the relationship between
hurricane *intensity* and a warming planet. Note that the link is not in
storm frequency, but on storm intensity. In other words, what the model
says is that of the storms that do occur, more will be bigger.
ftp://texmex.mit.edu/pub/emanuel/PAPERS/NATURE03906.pdf
Now, cut to the 2007 hurricane season. There were two cat 5 hurricanes out
of a total of 4 storms, which is a fraction of 0.5 (not to mention that
both cat 5's followed essentially the same track, which is unprecedented in
the history of observations (plus you had Humberto, which intensified
faster than any storm even so close to landfall (go to the NHC website
archives and find the forecasters comments on Humberto if you don't believe
me, which you don't, but you won't check, but you should, because I am
right and it will save you from looking foolish when you call me names and
I then provide the link from the NHC website))). If you go back through
the archives and calculate the fraction of major hurricanes to total
hurricanes each season back to 1980 or so, you will find a fairly steady
increase in this fraction. This is Emmanuel's point, in a warming climate,
the total number of cyclones that form is still a function of vertical
shear and tropospheric forcing, but *if* you form a cyclone, it has a
better chance of turning into a major storm.
Interestingly, if you do the same exercise for typhoons, you find the same
thing. Total typhoon number from 1980 through 2006 is highly variable,
with frequency not really correlating from year to year. However, the
fraction of all typhoons that become super typhoons (equivalent to a cat 3
or bigger hurricane) increases steadily from about 0.2 in 1980 to double
that 0.4 in 2006. Again, maybe not more storms, but of the storms that do
form, more are bigger.
I am not surprised you think this season was exceptionally mild. The two
cat 5's, which made landfall as cat 5's (also unusual), killed brown people
so they didn't get much coverage here. However, I had the distinct
pleasure of flying into the outer fringes of Dean and it was intensely
cool. There was this huge container ship, at least 250 m long, sitting
there in the Gulf of Mexico. At that location, it was maybe 200 miles from
the storm's eye after it crossed the Yucatan and was in the Bay of
Campeche. We looked down and thought it odd that the ship had no wake. We
realized it was hove to, making no headway and treading water, just trying
to survive in the wave field kicked off by Dean.
This season wasn't mild, there just weren't a lot of storms and the ones
there were didn't kill white people.
--
Bill Asher