#299 Postby PurdueWx80 » Sun Aug 15, 2004 12:52 pm
I'm thinking of the 2 most likely courses for Earl, and I'll lay them out below. These are my opinions, obviously, but I am an educated meteorologist/grad student, so hopefully I can claim some knowledge about synoptic patterns. PLEASE feel free to add your comments, as I'm sure none of you will be shy to tell me how wrong I am. Here goes:
First things to consider are Earl's near west path, proximity to land, and fast forward motion. These may prevent development for the time being, but there is an upper level low east of Nicaragua that the storm is rapidly approaching. This will impinge some very slight SW or S shear, which should help the storm begin its turn. This will also aid the already perfect northerly outflow jet, and help to enhance the storm. From there:
1. This summer has seen no shortage of amplified 500 mb flow. Take, for instance, the record breaking cold shot of last week. That was poorly forecasted 7-10 days in advance, as have many of the other cool shots this summer. There are indications of an omega block forming over the Pacific NW and SW Canada. If this happens, the polar vortex (can't believe we have a polar vortex this early) should slip further towards the SE, and into the Great Lakes, Ohio/TN Valleys, and NE. With the strong ridge in the subtropical Atlantic making its way west towards Florida, that will enhance the jet in between it and the vortex to its NW. If Earl is anywhere near the NW Caribbean, it should feel the vortex, and shoot off towards the NW and eventually N, even if it strikes the Yucatan first.
The models are hinting at a trough split in a couple of days, with most of it heading off to the NE, but a part backing into TX. This has happened a million and a half times this summer because of the stronger than normal Atlantic ridge, so I don't really doubt that it could happen by Tuesday or Wed. If so, Earl will have more of a chance at recurvature, especially if in the Bay of Campeche or Gulf, becuase of the southwesterly flow ahead of the trough/upper level low. Earl would have a very good chance of striking between Houston and Mobile.
Scenario 2. The storm continues to defy models and forecasters by continuing at 280-290. It is very far south, and moving rapidly west, with little indication of slowing or a turn towards 310 degrees. With the ridge building into the Atlantic, and the vortex pulling further to the NE, rather than into the Ohio/TN Valleys, then the ridge should back further west, into the Gulf or over FL. This would keep Earl on a WNW path for a much longer amount of time, and it would most likely hit Belize or the Yucatan. Some models show the ridge being very strongly centered over FL, in which case, a re-emergence over the Gulf would send it to the NW or NNW, into anywhere from Mexico to Houston-ish.
There are of course some in-between options, but that's where I see it as of now. Everyone in the western half of the Gulf should stay very alert to this, as should folks in Mexico. I've said this a million times now, but the waters in the western Gulf are easily capable of enough energy for a Cat 5, given perfect outflow and low shear. Even if Earl doesn't make it there, the water profile is like gunpowder waiting to explode.
Now, what do you guys think???
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