#38 Postby KWT » Thu Jul 08, 2010 5:45 pm
I've said time and time again in other threads developing La Nina's tend to have slow starts...the fact we had such a strong hurricane in June really rings big alarm bells...indeed quite a few La Nina seasons start later then normal and actually are below average for the start but in warm AMO phase nearly all have ended up between 14-16NS...
Its therefore not hard to assume that 13-15NS are easily do able in the peak season with SST's rampant right now and a weak La Nina in place...it in fact reminds me a heck of a lot of 1995 right now, though the early season will probably be a touch slower overall due to the La Nina developing a little earlier and impacting the atmosphere stronger.
If you want to know why this is the case, its simply because in La Nina's MJO phases pretty much don't occur they are so weak and 2010 is no exception, its pretty much all static out there. In the early seasons the MJO phases tend to have a bigger role simply because generally the instablity isn't quite as high due to higher upper temps in the middle of summer, they will soon drop away as we get towards August and thus combined with the weakening SAL intrusions from the 20th of July onwards things will ramp up rapidly.
If you really want to see what this season will be like in its peak, take a look at the 10 day period in the EPAC where we got 3NS and a depression, with 2 major hurricanes. Lets just say the EPAC conditions were briefly probably what the Atlantic will be over a 2 month period. The reason why the EPAC got the busiest June on record ACE wise is simply because the Atlantic waves were actually stronger then they'd normally be due too conditions being so condusive in the Atlantic relative to normal (though they've briefly become more hostile due to the ULL further north and the SAL, but thats normal really) that once they reached the EPAC, they already had a headstart, also why several formed so close to the Mexico coast compared to normal in June.
The ONLY was we get an average season in terms of numbers is if we get 6-8 long lasting CV major hurricanes, maybe something like 1964...and I'm not sure thats going to be a good thing if we get the upper high profile sat where I think it likely will be over the NE states...(should start to lift out from where it is right now soon IMO)
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