Tropical Storm Isaac continues to improve in structure today, continuing a steady trend that began overnight. Initially, Isaac was basically purely tropical, having been forming out of a tropical wave, but over the past day or two, as former Invest 96L interacted with a colder upper level low, he had become largely subtropical, and perhaps in post- ( Read more... )

Tropical Depression Nine, now recently-upgraded Tropical Storm Isaac, is expected to almost certainly recurve and head northeast out to sea.

Tropical Storm Isaac

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Can't keep it a secret for much longer ;)

And it's about to be officially listed up on NHC's website, anyway. Barring some unforeseen and sudden demise, we do indeed - at loooong last - have 96L upgraded to TD9 this afternoon.


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Invest 96 has been one of the longest-lasting "Invests" (an officiated area of interest which NHC is watching closely for further investigating)I have ever seen. A full week - over 144 hours - of walking a very fine line between being upgraded, and being left alone ( Read more... )

We've had a sleeper disturbance for several days now that is finally exhibiting signs of coming to life. Deeper convection has begun to wrap around, in a general banding manner, the surface cyclone - which is clearly evident on QuikScat (Scatterometer) analysis ( Read more... )