Tony Cristaldi
(NWS Meteorologist)
Sun Dec 09 2007 08:17 PM
Re: Post Season... Watch Disturbance Northeast of the Caribbean

The weather pattern across Florida and the SW north ATLC will be pretty atypical for early-mid December: almost summerlike from a synoptic perspective, albeit with the much lower sun angle and cool shelf water.

Nevertheless, there will be an unusually strong deep layer mean ridge holding sway between 55W and 90W, with it's axis roughly along 28N-30N. This should send 94L generally westward and perhaps a bit south of due W over the next 3-5 days.

As far as the system's intensity is concerned, how much the system spins up will be dependent upon:

1) the evolution of the H25 low/trough with which 94L is currently interacting.
2) Potential interaction with the island of Hispanola in 2-3 days.

I think the main track issue will be how fast and to what extent the deep layer ridge breaks down in the vicinity of 75-80 west during days 4-6. The GFS had been breaking down the ridge faster and to a greater extent than the ECM, (which resulted in a faster cold frontal passage through Florida next weekend), however the last few runs of the GFS had trended decidedly toward the ECM, of which I'm usually a big fan (owing to it's generally superior handling of the H50 height fields over NOAM).

Indeed, an interesting feature to watch during the upcoming week. It has the potential to bring some much needed rain to Florida, however it also has the potential to cause some problems for the GA.



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