weatherguy08
(Weather Hobbyist)
Fri Aug 31 2007 02:36 PM
Re: Tropical Depression Developing East of Caribbean

The post on the home page as well as some of the model runs are saying that 94L/TD6/Felix is to continue a generally westwards track. I have to disagree with this somewhat after looking at the 700 - 850 MB Steering Layer Map from CIMSS. The map shows a strong ridge in place, centered east of Bermuda, extending as far west as midway between Bermuda and the East Coast. Also, the southwestern corner of the high has very fast steering currents which lie just ahead of the system. Should it enter this area, we could see a brief, but rapid and significant northward jog of the system. If this occurs, the two major scenarios I could see would be for the system to go out to sea or possibly affect Florida and The Bahamas. Also, the Gulf Coast may have to watch this system in the future as the National Weather Services offices in Houston, Lake Charles, Slidell, and Mobile are all forecasting a retrograding trough over the northern GOM to spawn an upper-level low over central Texas which would move northeastwards causing a breakdown of the high pressure over the area.

In summary, everyone along the United States coast should watch this storm (check daily updates for now). As for the models, I do not put a whole lot of stock in them at this point as it is early and the storm has not become established yet. Also, Recon data that is inserted into the models can cause a massive impact on model guidance as we saw with Hurricane Dean.

Link to Steering Layer Map: http://cimss.ssec.wisc.edu/tropic/real-time/atlantic/winds/wg8dlm1.html

Edit:

Almost forgot! This map from the HPC shows a low pressure and trough over the north-central United States which is forecast to help the breakdown in the ridge over the eastern half of the CONUS late next week.

Link: http://www.hpc.ncep.noaa.gov/medr/9mh.gif



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