Last night I mentioned on my personal twitter account that it looked like Tropical Storm Isaac was jogging west-southwest on Satellite imagery.
Seems I was right after looking over some data this morning. Also while reviewing data this morning, he appears to continue jogging in this direction. So what is causing this ? A couple of things. We have a Bermuda High in the Atlantic rotating clockwise pushing from the Northeast to the southwest which is to the Northeast of Isaac, and a tropical upper tropospheric trough [Tutt] rotating counter clockwise that was to the west of Isaac. In this case the Bermuda high is stronger and helping to steer Isaac West-Southwest. You can see this on the Image below, a surface chart showing these features which I’ve highlighted for you.
What this means if it continues is, Isaac will likely for the short term delay interaction with Hispaniola and Cuba to his west and have time to grow and become stronger while continuing too transverse the warm waters of the Caribbean. Should this occur Isaac stands a greater chance of surviving and emerging a bit stronger than he would, once he does cross those Islands.
As for Isaac .. he is currently farther south situated at 15.3North 64.0West and is weaker with winds of 40mph this morning. He is moving to the West at 12mph and has a central pressure of 1004mb.
Computer models are all over the place at last look as they try to get a handle on him. So … at this time the future track of Isaac remains uncertain for this reason and some influence from what was mentioned above. Florida, the Eastern Gulf coast and the Southeast Atlantic coastal states should continue to monitor Isaac. I think by Friday I should have a better idea where Isaac is going as far as exact location.
Several National Weather Service offices across the southeast will be releasing radiosondes [weather balloons] into the atmosphere every six hours beginning Friday to get a better handle on the trough over the southeast and the Bermuda high in the Atlantic. Until they and I have a better handle on things, I’m sticking with my previous thoughts of this storm going up the spine of Florida or there about and heading to the East Northeast. I am not one to chase computer models when they shift the track every run.