ATL: ISAAC - Post-Tropical - Discussion

[x-y-no]

The direction of movement in NHC advisories is a six hour average.

[Ken711]

OK -- now I am experiencing the optical illusions caused by radar, because in the last radar posted by Cronk (linked below), I see southeast movement.

http://radar.weather.gov/radar.php?prod ... X&loop=yes

Looks stationary from that loop to my eyes.

[CronkPSU]

OK -- now I am experiencing the optical illusions caused by radar, because in the last radar posted by Cronk (linked below), I see southeast movement.

http://radar.weather.gov/radar.php?prod ... X&loop=yes

i couldn't figure out in the last 15 minutes if the eye was contracting or going SE either...

[catskillfire51]

if it's only .1N and .2W movement over an hour that would be pretty stationary.

just my uneducated opinion

[BigB0882]

There is a very short time in that loop where the eye makes an absolutely perfect circle. So pretty.

[wicked_wx_watcher]

does anyone know how to monitor the ham radio guys? how do i get that transmission?

14.325 MHz

[windnrain]

This is kind of funny...
Isaac is refusing to go down. He doesn't want to enter.

[bob rulz]

The direction of movement in NHC advisories is a six hour average.

To my untrained eye (and that of several others, I know it's not just me), the 6-hour movement seems to be nearly do west.

I'm not saying that the NHC is wrong, necessarily, but taking all of these observations into account, if it was moving due NW it would've been inland by now, not skirting the coastline. I would just like to know what they're looking at so that I can learn from it.

[Texashawk]

043400 2853N 09001W 8429 01232 9692 +210 +210 143001 006 002 004 05

.8 seconds S and .6 seconds W since last VDM.

[ROCK]

wgno crew are all saying it has to be going west (and maybe even WSW) and wondering what the hell NHC is talking about

Yeah, I think some of the local weather guys are believing their own eyes and the radar...and not the "moving NW @ 8mph" form the Nhc.

TWC seems to see the W movement casued by the steering high front to the north.

yeah like we have been saying over in the model thread until we were blue in the face....

[Jagno]

I'm seeing the costliest Cat 1 Hurricane in the making. This storm has wreaked havoc from Haiti to Louisiana and it's not nearly ready to sit this dance out.

[catskillfire51]

This is kind of funny...
Isaac is refusing to go down. He doesn't want to enter.

He can't go inland, as per twc, a upper level ridge is going across central states, bringing winds out of the northwest which are pushing isaac. He has no place to go right now.

just my uneducated opinion

[Texashawk]

And FWIW, the center is just about exactly in the center of the radar eye.

[gboudx]

This is kind of funny...
Isaac is refusing to go down. He doesn't want to enter.

He can't go inland, as per twc, a upper level ridge is going across central states, bringing winds out of the northwest which are pushing isaac. He has no place to go right now.

just my uneducated opinion

http://image.weather.com/images/sat/usvap_600x405.jpg

[CYCLONE MIKE]

Been blasting the last couple hours. For everyone mentioning the warming cloud tops, know that most of the local TV models show continued pulses over the next 24 hours. Two divergent ones showed rotating pulses around the center and over nola later this morning and another in the afternoon. Watch for re-genesis of the colder tops over the next day or so.

Thanks for the reminder Steve. The warming cloud tops is definitely noticeable but as long as this stay over water he could just as easily ramp back up in a few hours as well. Winds picking up around here as well. Getting very frequent gusts in the mid 40's

[Ntxw]

This is kind of funny...
Isaac is refusing to go down. He doesn't want to enter.

He can't go inland, as per twc, a upper level ridge is going across central states, bringing winds out of the northwest which are pushing isaac. He has no place to go right now.

just my uneducated opinion

Technically northeast pushing him wsw or w air flow around highs doesn't go from NW to SE but that's technicality same idea. He will head north once the high moves east or weakens which will probably be late tomorrow.

[DukeDevil91]

I expect a flare up of cold cloud tops here soon.

[catskillfire51]

SUMMARY OF 1200 AM CDT...0500 UTC...INFORMATION
-----------------------------------------------
LOCATION...29.0N 90.0W
ABOUT 60 MI...95 KM SE OF HOUMA LOUISIANA
ABOUT 70 MI...110 KM S OF NEW ORLEANS LOUISIANA
MAXIMUM SUSTAINED WINDS...80 MPH...130 KM/H
PRESENT MOVEMENT...WNW OR 290 DEGREES AT 7 MPH...11 KM/H
MINIMUM CENTRAL PRESSURE...969 MB...28.61 INCHES

[Ken711]

NHC Update:

12:00 AM CDT Wed Aug 29
Location: 29.0°N 90.0°W
Moving: WNW at 7 mph
Min pressure: 969 mb
Max sustained: 80 mph

[boomstyk]

NHC 969. He's losing pressure! Not much but losing none the less.