ATL: ISAAC - Post-Tropical - Discussion

[Aric Dunn]

big band just coming into my location. should see just about all hes got.

[hurricanes1234]

Those are very odd times for updates - 6 PM CDT and another one to come at 8 PM CDT.

[lester]

pressure down to 967.3 mbs according to recon now, still strengthening in the swamps

[Janie2006]

Cantore confirms landfall, just SW of the Mouth of the Mississippi...No city has been named, yet. (which is basically marsh). 2nd landfall soon.

I'd call that the city of Marshville. Okay, that was bad.

The water vapor imagery is interesting this evening....a lot of dry air in central MS and AL that is eating away at those feeder bands as they move ashore. Isaac is doing a remarkable job of moistening the atmosphere, but it's the same story with this fellow. Dry air remains a hindrance to greater destruction that he might otherwise cause through tornadic activity, etcetera.

[Puddinhead]

NOAA DOPPLER RADAR INDICATES THAT HURRICANE ISAAC MADE LANDFALL
ALONG THE COAST OF SOUTHEAST LOUISIANA IN PLAQUEMINES PARISH JUST
SOUTHWEST OF THE MOUTH OF THE MISSISSIPPI RIVER AT 645 PM CDT...
2345 UTC...WITH MAXIMUM SUSTAINED WINDS OF 80 MPH...130 KM/H.

Any chance they have gps coords available????

I'm thinking they're referring to Southwest Pass...it's the branch of the mouth of the River that points, well....southwest...on the maps. You can pick it out pretty easily, but the thing is that it sticks out into the Gulf enough such that any storm landfalling there is going to have a "second landfall" somewhere.

[tolakram]

Recon fixes, which apparently is why they went with landfall where they did.

from the recon thread

[monicaei]

NOAA DOPPLER RADAR INDICATES THAT HURRICANE ISAAC MADE LANDFALL
ALONG THE COAST OF SOUTHEAST LOUISIANA IN PLAQUEMINES PARISH JUST
SOUTHWEST OF THE MOUTH OF THE MISSISSIPPI RIVER AT 645 PM CDT...
2345 UTC...WITH MAXIMUM SUSTAINED WINDS OF 80 MPH...130 KM/H.

Any chance they have gps coords available????

I put it near 29.03, -89.25

So west of Fourchon, somewhere in Timbalier bay? That puts GI in bad shape. Good luck and god speed to my lil oily piece of land

[tolakram]

Ok, AF just pegged it NW of there, and NW of their previous fix, so still moving NW. Nice flying.



And look at that track line!

[Steve]

That band looks nasty. City looks to to get smacked for an extended period with it. Yikes. Also, system is pulsing. Can that sustain through dmax?! Some of those clouds are exploding near the coast.

[Solaris]

RECON 967.3 MB
FL WINDS 93 KTS

[tolakram]

One of the last visibles of the evening

[TeamPlayersBlue]

Jim Cantore is about to get smacked by a band. Good tv in about 30 minutes

[WeatherGuesser]

So west of Fourchon, somewhere in Timbalier bay?

I don't know ... those aren't labelled on my map. But NHC puts their numbers in the same area:

7:00 PM CDT Tue Aug 28
Location: 29.0°N 89.4°W
Moving: NW at 8 mph
Min pressure: 970 mb
Max sustained: 80 mph

[monicaei]

NOAA DOPPLER RADAR INDICATES THAT HURRICANE ISAAC MADE LANDFALL
ALONG THE COAST OF SOUTHEAST LOUISIANA IN PLAQUEMINES PARISH JUST
SOUTHWEST OF THE MOUTH OF THE MISSISSIPPI RIVER AT 645 PM CDT...
2345 UTC...WITH MAXIMUM SUSTAINED WINDS OF 80 MPH...130 KM/H.

Any chance they have gps coords available????

I'm thinking they're referring to Southwest Pass...it's the branch of the mouth of the River that points, well....southwest...on the maps. You can pick it out pretty easily, but the thing is that it sticks out into the Gulf enough such that any storm landfalling there is going to have a "second landfall" somewhere.

LMAO at something landfalling on SW pass! I bet it hit a channel marker... That's land, right??? Red or green I wonder?

[Stephanie]

Amazing contrast on local TV coverage just now...one reporter at New Orleans lakefront, where it looked like the footage Weather Channel uses to open there Tropical Updates: winds howling, breaking off the tops of the huge waves as they break over the top of the seawall into howling spray, reporter pointing out water a few feet up a picnic shelter house....over in Mandeville on the north shore of the lake, a different reporter was standing in front of Lake Pontchartrain which was perfectly flat with barely a ripple. That will change later on tonight, I'm sure.

Can't hear the television in the next room from here, but I'm not exactly sure why they're keeping video footage of the 17th Street canal on for so long. I did catch that the floodgates at 17th Street Canal, Orleans Canal, London Avenue Canal, and IHNC (Industrial Canal) have all been closed. These are all new since Katrina. This is a good thing for me, as rising storm surge backing up these canals is what submerged me for Katrina, but the problem for me is that when they close these gates they rely on new pumps they've installed at the gates to lift the rainwater in the canals (that's where the rainwater that falls on New Orleans' streets is pumped to) over the gates and into the elevated Lake Pontchartrain. So I'm supposed to be less vulnerable to storm surge flooding, but more vulnerable to rainwater flooding.

Yes you are and like all other residents in the city.

It is putting all of your marbles in one bag, so to speak. It isn't the best design. The correct, better engineered desgn. was to relocate the pumping stations to the mouth of each outlet canal so you wouldn't need to have a dam at the end, like they have constructed and have made the older pump stations at the mercy of the newly installed pumps at the dams at the end of the canals.

Sounds like they created one big bowl around New Orleans that will now fill with rain water.

[tolakram]

Latest saved loop. Bands entering New Orleans.

[Meteorcane]

GRand Isle getting hurricane force gusts, but they can handle it down there,

[windnrain]

DEFINITE jog west now.

[MGC]

I'm watching WVUE channel 8 out of New Orleans...Bob Breck was just showing that Isaac is stair stepping....a little to the north a little to the west netting a NW motion......Yes, that band looks pretty intense that should pass over the metro New Orleans area soon...I'm still feeling a ENE wind....was down on the beach about an hour ago and the water is up to the seawall. should get really interesting when the wind shifts to the SE and pushes water up on the beach......MGC

[BigEasy]

So, right where I said it was, but where others were saying there was no land.

I just called it about 25 minutes too early:
viewtopic.php?p=2270248#p2270248

Yes there is land....marshland, which there is very little actual land. Good call I would say, if that is what you forecasted.