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Tracking the tropics - 2025


tiger_deF
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1 minute ago, SouthCoastMA said:

Deleted my post by accident.. but October you can get a second mini peak around mid month...however doesn't the pattern typically get more hostile by then with regards to westerlies? (up here)

Maybe we can Rocktober again. That was the best warm season type event since Bob I think. 

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1 hour ago, WxWatcher007 said:

Flatlined as expected after Erin. 

XfDVJwr.png

What’s really interesting though is that this has been a multi-year global trend. The basins have struggled. WPAC in particular. 

I think we all know warm water is the fuel it needs, but it goes to show you how fickle these things are. You can have water that’s boiling below it, but if one atmospheric factor is off, you’re not getting much. 

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1 hour ago, CoastalWx said:

I think we all know warm water is the fuel it needs, but it goes to show you how fickle these things are. You can have water that’s boiling below it, but if one atmospheric factor is off, you’re not getting much. 

It glazes eyes over - apparently - in here, as I've tried to explain this aspect about nature - it doesn't report back like anyone gets it.  It's probably me and my writing...

Gradient is everything.  Not sure why it doesn't resonate with the 'cognoscenti' of the site but ...heh.  Anyway, warm water doesn't cause hurricanes  ( I'm just using your post as a staging launch)   it doesn't

What is correlated to TC genesis is the qualitative state of the [empirically observed] sounding, which has also long been geophysical derived thermodynamically. 

The tropical sounding (identified by some dude, Jason Dunion) has warm air moist air from the surface to 500mb give or take.  But as you head toward ~ 300 mb level the DPs drop way off:  such that the wet-b temperature is relatively low.  So, you have a statically unstable environment ( CAPE -heavy air), with warm dry air over top.  This initially tends to resist intability in that high level ( which incidentally...due to thermal wind consideration, tends to outflow/divergence ...hence why we look for anticyclonic wind fields at high levels).   The the divergence excites/forces UVM.  The arriving warmer psuedo-adiabatic turrets turbulently mix, lowering the temp ... which adds to the instability/UVM above 500 mb/acceleration. 

There's bound to be exceptions.   Of course...that's why there are 'phase transition' cyclones that quasi overlap.   But should these soundings deviate significantly enough ...doesn't matter how warm the water is.  No TC.   

The sounding as described above really outlines a thermodynamic gradient.  Like every system that exists in the Universe, the greater the change between A vs B ( which is the gradient ), the more violent A --> B  ... that's the difference between a stressed out coughing TC, versus Dorian 175 mph oil driller.   Not talking about mechanical stress like shear and so forth.  But there's no point in considering these latter mechanics if the thermodynamics are not satisfied to begin with.

 

 

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