Saturday, July 31, 2010

Invest 90 L And Other Hurricane Season Thoughts

There  has been  alot of talk around the  internet about the hurricane season in general and how it should pick up etc because of climo etc. So i want to shed a light into some of this from this perspective.

Eastern Atlantic Water Vapor (click here)

Water Vapor across this area basically shows the waves that are coming off the coast actually end up losing their lack and their luster. Why?

wm7shr

There is a good amount of shear around and north of the area where these waves are coming off and its basically acting like a shredder and shredding them apart. Then the way things have been going and the way things still look in the atlantic itself...

wv-l

Dry air covering the majority of the atlantic. However, these waves are staying generally south of the dry air. While this is true, the very fact that this dry air is to the waves immediate north it is still getting ingested into these systems. The area that is staying essentially out of harms way of this dry air is essentially the ITCZ but because this is still somewhat suppressed to the south it makes things alot harder to spin up. So these waves in the ITCZ can not develop unless they break off and gain latitude.
So along comes a wave like 90 L and this was part of the ITCZ and never broke away so it essentially stalled, slowed down and lost its steam. However...the wave you see here circled in black is not the same wave that was behind 90 L in the afternoon yesterday.

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If you go to the Eastern Atlantic WV and slow down the speed settings you will see that that wave actually got shredded apart and yet this is now another wave...
MJO is still in phase 3 and if it does go into the COD...this is not a good area for tropical storm development. The MJO models are actually all over on where this is going to go as some keep it in the COD, while others take it into phase 1 , while yet still others take it to phase 4 or 5 and even one takes it into Phase 8.
So right now we have the MJO that is unfavorable..
We have shear off the coast of Africa that is unfavorable
We have a ton of dry air in the Atlantic that is unfavorable
We have an ITCZ that is still somewhat suppressed...
So there has been reasons as to why the very memorable July has become not memorable. As July was expected pretty much from the pros to be like August. That did not happen. So even though climo suggests that the clock is ticking to August 1st... I think I would be a little wary and cautious to suggest just because of climo things will ramp up until we see some of the above cease to exist....
Again...not expecting any development any time soon with invest 90 L (if it can even be called an invest any longer) ...

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