Brief Isaac Update .. 24 hrs to landfall ..

We just want to post a very brief update on Tropical Storm Isaac. Alot of people around the net are wondering why does this storm have a pressure of 979 MBS and yet it is still a tropical storm? The answer really lies in the three images that are below.

This first image is the Tropical Cyclone Heat Potential fields. And ideal conditions for tropical storms to develop and intensify (if you look at the scale on the right) would be anything that is 80 or above. As you can see the waters that Isaac are travelling over do not have that much heat potential. 

 Reason #2 is in the water vapor image and this is showing that there is dry air that is being entrained into the center... Dry air is never a favorable thing for systems to develop. 

Reason # 3 is that the system is still NOT vertically stacked and the mid level center is further south ... You can see this when looking at the vorticity levels at 700 ,500 , 200

Reason # 4 is the shear size of the system and the large radius of winds that it is producing. Whenever you have a large system such as Isaac it takes longer to contract and pull the convection to the center and wrap around.. So while you may have flight level winds that support a hurricane they are not making it down to the surface...

We are completely dismissing a Category 3 probability...and we are now going with at best a Category 1 hurricane. IF the dry air can be worked out of the system and we get an eyewall to close off then it is still possible to obtain a higher category..However.. we are running out of time and running out of space... It is only about 24 hrs to landfall!