Still calling for something this week:
Tropical Weather Discussion
Issued: Tuesday, May 27, 2008 535 am EDT
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Things have become more uncertain this morning in terms of whether we will have tropical cyclone development in the far southwest Caribbean later this week. This morning's surface tropical weather analysis showed a weakening frontal system located over the northern Caribbean just northwest of Jamaica, a tropical wave tracking westward across the central Caribbean and an area of low pressure now located over the eastern Pacific just south of El Salvador tracking eastward. I am watching both the tropical wave over the central Caribbean and the area of low pressure just south of El Salvador to see if either of these two systems will trigger tropical cyclone development later this week in the southwestern Caribbean. Infared satellite imagery does show some convection over the southwestern Caribbean, however, there is currently a lack of deep organized convection in that area. It should be noted that wind shear values in the western Caribbean are very unfavorable for development, however, they should become more favorable by Thursday and Friday.
This morning's computer forecast guidance has become more wishy-washy on development in the southwest Caribbean later this week into this weekend. Now, obviously I always look at the current trends of the tropical weather situation and then blend in the models. As of right now, it appears that tropical cyclone formation is not expected for at least the next couple of days as wind shear values are too high and there is a lack of deep convection in the southwest Caribbean. Now, let's take a look at model land:
The GFS model shows a weak low pressure system hugging the coast of Central America through Friday and then tracking across Belize and the Yucatan Peninsula this weekend. As for next week, the GFS model forecasts that this storm system will remain over the Yucatan Peninsula through at least next Tuesday. The GFS model pretty much keeps the system just inland from the Caribbean and never really develops the low.
The Canadian model forecasts that the low pressure system now over the eastern Pacific will cross central America on Thursday and be located near Belize on Friday. The Canadian model then forecasts this system to cross the Yucatan Peninsula on Saturday and briefly emerge into the Bay of Campeche this weekend before diving south into Mexico on Monday.
The NOGAPS model forecasts that a broad area of low pressure will form in the western Caribbean over the next 72 hours and then track slowly into the northern Caribbean this weekend. The NOGAPS model then forecasts this system will cross central and western Cuba on Sunday into Monday before tracking northeast just east of the US East Coast on Tuesday.
Here are my thoughts on this: I still think we will have a tropical depression form somewhere in the southwest Caribbean late this week, probably around Thursday or Friday. I think the trigger will be the low pressure system now located to the south of El Salvador. As for a possible forecast track, that is even harder as that depends on the stength of high pressure to the north. If the high holds tough, then a track more towards inland Mexico (Canadian model track) would be more likely. If the high pressure system breaks down or forms a weakness (NOGAPS model track) then a track to the north and northeast would be more likely. As for possible strength, that all depends on how close the system remains to land, if the potential depression remains close to land, then little or no strengthening is likely. If the potential depression is able to get out into the Caribbean more, then strengthening into a tropical storm is possible.
So, keep checking back with these discussions as I will be monitoring things very closely this week and I will keep you all updated on the latest developments concerning this potential system.
The next tropical weather discussion will be issued by 7 am EDT Wednesday morning.
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