Re: 96 hrs out: watch around 45W
Posted by
JAC on 9/14/2010, 11:06 pm
Your right 92L did take time to spin up to Karl.
It wasn't really spawned by a wave.
It was more a top down development.
Been reading some blogs on it.
I think the steady moderate rain (stratiform precip) that kept firing over it created a gradual mid-level warm core.
That in turn created a mid-level vorticity, technically called a potential vorticity (PV).
Some how, something needed to kick that down to the surface.
I have read of mechanisms that do that for tail-end cold fronts that work their way to the surface - called baroclinic genesis.
How that happened today, I am still not sure.
No cold-fronts around, this was all barotropic.
I am wondering if this is a sign of an upcoming trend for the next few weeks.
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9/14/2010, 6:23 am Post A Reply
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