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Tropical Storm Isaac: Part 4- Storm analysis and discussion


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BULLETIN

HURRICANE ISAAC INTERMEDIATE ADVISORY NUMBER 33B

NWS NATIONAL HURRICANE CENTER MIAMI FL AL092012

800 AM CDT WED AUG 29 2012

...ISAAC LASHING SOUTHEASTERN LOUISIANA WITH STRONG SQUALLS...

DANGEROUS STORM SURGE AND FLOOD THREAT FROM HEAVY RAINS LIKELY TO

CONTINUE THROUGH TODAY AND TONIGHT...

SUMMARY OF 800 AM CDT...1300 UTC...INFORMATION

----------------------------------------------

LOCATION...29.5N 90.5W

ABOUT 15 MI...20 KM ESE OF HOUMA LOUISIANA

ABOUT 40 MI...70 KM SW OF NEW ORLEANS LOUISIANA

MAXIMUM SUSTAINED WINDS...80 MPH...130 KM/H

PRESENT MOVEMENT...NW OR 310 DEGREES AT 6 MPH...9 KM/H

MINIMUM CENTRAL PRESSURE...970 MB...28.64 INCHES

WATCHES AND WARNINGS

--------------------

CHANGES WITH THIS ADVISORY...

NONE.

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SUMMARY OF 900 AM CDT...1400 UTC...INFORMATION

--------------------------------------------------

LOCATION...29.6N 90.6W

ABOUT 5 MI...10 KM E OF HOUMA LOUISIANA

ABOUT 40 MI...65 KM SW OF NEW ORLEANS LOUISIANA

MAXIMUM SUSTAINED WINDS...75 MPH...120 KM/H

PRESENT MOVEMENT...NW OR 310 DEGREES AT 6 MPH...9 KM/H

MINIMUM CENTRAL PRESSURE...972 MB...28.70 INCHES

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From radar it appear Isaac has resumed slow NW movement and is now far enough inland that slow weakening should be commencing.

agree. In the last hour, I see a very slow northward component to the motion versus last night where motion was westward or not at all. Pressure has come up 3-4mb as well since early morning. Given his size, the winds will be slow to ebb.

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Not to nit-pick, but do you mean Danny (1997) or Dennis (1999)

I had to go look it up last night and could not find a Dennis in Mobile Bay modified the search and showed up Danny.Look at the cords. and I think you will see the stair step away from land.

Also last hour wind speeds starting to get alittle more persistent in the 20-25 with maybe gust at 35-40?Looks to have some type of N movement whether to the W or E kinda hard to decern attm

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For the first time the entire coc is onshore and there is a definite short-term NNW movement. I suspect it will not be permanent but it is way too early to tell. Also the west side seems to be a little more robust in the last few frames. Now that everything is onshore I'm interested to see what happens to convection and the rain shield this afternoon.

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