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The effects of Isaac will be felt all the way into the Ohio Valley through this weekend in the form of heavy rains and thunderstorms. The impacts of tornadoes will probably be the greatest today across Mississippi and parts of extreme western Alabama. Bands of thunderstorms feeding off the Gulf of Mexico continue to show signs of rotations, and that means more in the way of tornadoes. These are quick-hitting type tornadoes that spin up very quickly, hit hard and go away in a matter of minutes.
The other aspect of Isaac will be the heavy rains. I posted a map of the GFS accumulated rainfall through Sunday. As you can see, the model is predicting over an inch of rain all the way into Ohio. It's not out of the question that some of the rains from Isaac spill over the Appalachians Sunday into Monday.
We will have a TD today and probably Leslie within a day or so. Most of the models take Leslie out to sea. The Euro is the most west with the storm nearing the East coast by next weekend but not making it. One can argue that if the trough coming into the East stays in the Mississippi Valley like what the Euro shows, that could open the door for a close call along the East coast. it also could mean that the front coming through gets hung up along the East coast and we end up with a soggy weather pattern next week. It's tropical season and funky things happen.
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Storm is coming up the coast but will only skirt New England. Heat follows into the East.
Florida gets drenched and the same storm skirts New England
While a system may develop, welcome rains will hit Florida this weekend.
System may develop in the Gulf of Mexico as the hurricane season starts today.