ATL: IDA - Remnants - Discussion

Moderator: S2k Moderators

Message
Author
User avatar
mrbagyo
Category 5
Category 5
Posts: 3613
Age: 31
Joined: Thu Apr 12, 2012 9:18 am
Location: 14.13N 120.98E
Contact:

Re: ATL: IDA - Remnants - Discussion

#5281 Postby mrbagyo » Sun Sep 05, 2021 9:37 am

0 likes   
The posts in this forum are NOT official forecast and should not be used as such. They are just the opinion of the poster and may or may not be backed by sound meteorological data. They are NOT endorsed by any professional institution or storm2k.org. For official information, please refer to RSMC, NHC and NWS products.

User avatar
Blinhart
Category 5
Category 5
Posts: 1981
Age: 47
Joined: Thu Sep 08, 2011 3:13 pm
Location: Crowley, La.

Re: ATL: IDA - Remnants - Discussion

#5282 Postby Blinhart » Sun Sep 05, 2021 10:35 am

mrbagyo wrote:Most roofs in Grand Isle remained intact
https://storms.ngs.noaa.gov/storms/ida/index.html#18/29.22876/-90.00318


Look at the whole Island, not just that one section. The whole island has been put as uninhabitable, and they don't know when it will be able to go back.
2 likes   
Personal Forecast Disclaimer:
The posts in this forum are NOT official forecast and should not be used as such. They are just the opinion of the poster and may or may not be backed by sound meteorological data. They are NOT endorsed by any professional institution or storm2k.org. For official information, please refer to the NHC and NWS products.

Sanibel
Category 5
Category 5
Posts: 10348
Joined: Mon Aug 30, 2004 11:06 pm
Location: Offshore SW Florida

ATL: IDA - Remnants - Discussion

#5283 Postby Sanibel » Sun Sep 05, 2021 1:40 pm

S2K member "Montegut" got the full impact from Ida...They are going through it right now with no utilities and a wrecked house...Montegut LA was in the west eye...


Ida damaged the pipes that deliver oil from the offshore platforms...There's an oil spill in the Gulf just south of the Mississippi outlet...

New York City is just starting to realize the impact of Ida with its torrential flooding, property damage and deaths...

The intact houses on Grand Isle are an illusion...The barrier Island had severe damage from Ida's east eyewall...
4 likes   

LARanger
Tropical Depression
Tropical Depression
Posts: 82
Joined: Wed Oct 07, 2020 12:45 pm

Re: ATL: IDA - Remnants - Discussion

#5284 Postby LARanger » Fri Sep 10, 2021 7:07 pm

galaxy401 wrote:So still no word on LSU2001? I saw that the user's last post was after the power went out but has been silent since then. Hopefully it's just waiting until the power is restored.


For anyone skimming this thread later and wondering, he's good.

viewtopic.php?f=59&t=102784&p=2939817&hilit=lsu2001#p2939817
3 likes   
Baton Rouge area cyclone dilettante, PSWAGGER* tropical weather & hydrology model developer
(* Pseudo-Scientific Wild-A** Guesses Generally Expressed Ridiculously)
The GFDL would've had all this figured out by now.

Category5Kaiju
Category 5
Category 5
Posts: 3344
Age: 22
Joined: Thu Dec 24, 2020 12:45 pm
Location: Seattle

Re: ATL: IDA - Remnants - Discussion

#5285 Postby Category5Kaiju » Fri Sep 10, 2021 9:50 pm

 https://twitter.com/islivingston/status/1436326272104288257




Welcome to the horror club, Ida.

*I have a nasty gut feeling that this map will eventually become obsolete in the next couple of years and that it will be to a point where significant overlap between Cat 4+ CONUS landfalls along the Gulf will make it hard to individually discern the individuals storms* :eek:
2 likes   
Unless explicitly stated, all information covered in my posts is based on my opinions and observations. Please refer to a professional meteorologist or an accredited weather research agency otherwise, especially if serious decisions must be made in the event of a potentially life-threatening tropical storm or hurricane.

User avatar
Nancy Smar
Category 5
Category 5
Posts: 1081
Age: 23
Joined: Wed Aug 16, 2017 10:03 pm

Re: ATL: IDA - Remnants - Discussion

#5286 Postby Nancy Smar » Fri Sep 17, 2021 10:59 pm

1 likes   

ncforecaster89
Tropical Storm
Tropical Storm
Posts: 216
Age: 53
Joined: Sat Oct 20, 2018 12:32 pm
Contact:

Re: ATL: IDA - Remnants - Discussion

#5287 Postby ncforecaster89 » Sat Sep 18, 2021 8:35 pm



Albeit an impressive wind gust to be measured by any instrument, it’s important to analyze it within its proper context.

First, this was an instantaneous gust (far exceeding what the standard 3 second gust value would be) and not representative of an official wind gust measurement.

Secondly, the anemometer height is being reported to have been at 100 feet elevation; which far exceeds the standard recording height of 10 m (33 ft).

Thirdly, we have no idea of said anemometers ability to accurately measure a wind speed of such extreme velocities. For example, there was a 3 second wind gust of 212 mph measured during hurricane Andrew. After it was analyzed and properly calibrated, the wind gust was revised downwards to 177 mph.

All the aforementioned aside, there’s no data supportive of Cat 5 designation at Ida’s peak intensity (around 3.5 hours prior to first LA landfall), much less when it reached the coast. In short, I’d set the early morning peak intensity at 135 kt followed by 130 kt at the Port Fourchon landfall.
0 likes   

User avatar
Audrey2Katrina
Category 5
Category 5
Posts: 4235
Age: 74
Joined: Fri Dec 23, 2005 10:39 pm
Location: Metaire, La.

Re: ATL: IDA - Remnants - Discussion

#5288 Postby Audrey2Katrina » Tue Sep 21, 2021 11:25 pm

Just wanted to check in. Rode out Ida; but had to evacuate because my area was hit pretty hard and at my age and health--couldn't stay without power for weeks. Glad to be back, and I really don't care if nobody sees this; I wanted to find an Ida thread so I could at least check in!
15 likes   
Flossy 56, Audrey 57, Hilda 64*, Betsy 65*, Camille 69*, Edith 71, Carmen 74, Bob 79, Danny, 85, Elena 85, Juan 85, Florence 88, Andrew 92*, Opal 95, Danny 97, Georges 98*, Isidore 02, Lili 02, Ivan 04, Cindy 05*, Dennis 05, Katrina 05*, Gustav 08*, Isaac 12*, Nate 17, Barry 19, Cristobal 20, Marco, 20, Sally, 20, Zeta 20*, Claudette 21 IDA* 21

User avatar
cycloneye
Admin
Admin
Posts: 138789
Age: 67
Joined: Thu Oct 10, 2002 10:54 am
Location: San Juan, Puerto Rico

Re: ATL: IDA - Remnants - Discussion

#5289 Postby cycloneye » Wed Oct 06, 2021 1:33 pm

2 likes   
Visit the Caribbean-Central America Weather Thread where you can find at first post web cams,radars
and observations from Caribbean basin members Click Here

ncforecaster89
Tropical Storm
Tropical Storm
Posts: 216
Age: 53
Joined: Sat Oct 20, 2018 12:32 pm
Contact:

Re: ATL: IDA - Remnants - Discussion

#5290 Postby ncforecaster89 » Sat Oct 23, 2021 6:45 am

To better understand (determine) how that 223 mph instantaneous wind gust corresponds to a one-minute sustained wind speed at standard height…one can use the power law to covert from that 30 meter height to 10 meters elevation.


First, we need to convert the instantaneous gust to a 1-minute sustained wind speed. Extensive research

https://www.yumpu.com/en/document/view/ ... -from-1-/3

has shown that an instantaneous wind gust can be converted to a 1-minute wind speed by a factor of 1.45. In this case, it would translate to 154 mph.

Then, we’ll simply use the power law equation to extrapolate the aforementioned 154 mph wind at 30 m to a 10 m equivalent. To do so accurately, you need to utilize the appropriate surface roughness length. In this case, I’m using 0.10 for open ocean.


This converts to a 139 mph (120 kt) one minute sustained wind value. That’s a very impressive in-situ measurement to be captured at landfall in Port Fourchon.


Given its highly unlikely that any anemometer would be positioned perfectly to capture the highest wind speed in the eyewall, and taking into account that the strongest winds were likely found just to the E…this measurement provides excellent additional support for the operational intensity of 130 kt.
4 likes   


Return to “2021”

Who is online

Users browsing this forum: No registered users and 15 guests