5am: Hanna Still Drifting

Not much on Hanna has changed since the 11PM advisory; it’s still at 80 MPH drifting west at 2. What we’re waiting for is that turn to start, and that’s not expected to happen until tomorrow. The sooner it begins turning, the more northward the track will likely go.

One thing that bothers me from this morning’s advisory is this passage from the NHC discussion:

It is important to note that
Hanna is expected to continue to intensify…or at least remain
steady…until landfall occurs between 84 and 96 hours…rather
than appear to be weakening like some automatic intensity plotting
software may show. In fact…by 84 hours Hanna could be a major
hurricane.

The GFDL model has indicated for the past several days that this could hit minimal Category 3 strength before landfall, and for the first time it appears NHC is supporting this theory. Intensity is a struggle to predict; this deserves further watch as a potential Category 3 strike changes the game dramatically in terms of evacuations and other preparedness steps.

Here’s the full run of model plots from overnight. You’ll see two clusters; one favoring the Savannah track, and one favoring the northerly track into Charleston. GFDL also seems to want to target Myrtle Beach:

All Forecast Models -- Hanna -- 6am

Here’s one that focuses on the more tropical-oriented models; call it the “low-carb” spaghetti plot if you will. Note a bit more spread with these on the orders of hundreds of miles — this is significant, and why the cone of uncertainty is still so wide:

Significant Model Runs -- Hanna -- 09/02/2008 5am

And, for completeness’ sake, the largely unchanged official forecast, which still targets a Category 2 landfall now over Hollywood/Ravenel (but this is still minutia; still a long way to go to determine specifics):

Hanna Projected Path, 5am Advisory 09/02/2008

I’m hoping later today we’ll start to see what a projected wind field may look like over Charleston (and also hoping that maybe this thing will jog out to sea, but that’s not looking too likely at this point). Today is a good day to commence your preparations; my advice is to prepare as if it’s a medium Cat 3 at landfall. While that might not end up being the case, it’s best to over-prepare at this point. If in fact the higher intensity does begin to bear out, you may need to start thinking of evacuation plans depending on where you are.

I’ll be doing a video chat with the 5PM track and 8PM information at about 9:15 tonight. Stay tuned…it’s just now getting interesting.

4 thoughts on “5am: Hanna Still Drifting

  1. Greg

    Hurricane Hanna is coming for you…Jared the waether blog is amazing. Much better than that crap they run on CNN.

  2. Greg

    Hurricane Hanna is coming for you…Jared the waether blog is amazing. Much better than that crap they run on CNN.

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