Hurricane Katrina (in about 5 minutes)

This is a quick 5 minute video that encompasses all of Katrina, from the beginning to the aftermath. It's a good preview of my other videos and it'll give you an idea of what it's like to document a hurricane. I'm going to do longer videos of each section later so you can see more of what it was like.

Category:

Travel & Events

Tags:

• Hurricane
• katrina
• gulfport
• disaster
• mississippi
• wind
• storm
• chaser

[liquidstl]

@Me6adeth01 continued But an Irrotational Fluid has Zero Vorticity! and Vorticity is defined as Twice the Angluar Velocity..... but fluids in irrotational vorticies have angular velocity .... anyway the answer to your question is YES

[liquidstl]

@Me6adeth01 Yes..... From the Center ( edge of the EYE) to the outer rain bands, the Winds decrease proportionally to 1/r where r is the storm's radius..... Actually, Hurricanes and tornadoes can be thought of as an irotational vortex.... Which is confusing because the Vorticity is defined as Del Cross V ... The Vector Cross product of the Velocity Vector with the DEL or Nabla Vector ( Which is simply the partial derivatives WRT X  Y and Z times the I J and K unit vectors respectably.

[liquidstl]

you know that "Tornado" Coming off the bank, seems to be a demonstration of the Von Karmon Vortex Street..... The alternating shedding of vorticies in fluid flow around stationary object which is famously responsible for the collapse of the Tacoma Narrows bridge. because it caused the bridge to vibrate at its resonant frequency. I bet if you were in that building it would be just a little scary. ....

[liquidstl]

the wind to cause any degree of damage would remain the same for a given structure? It also wasn't clear if they meant that higher winds would have to occure at a 10 meter height for the same damage to occur lower due to increased friction and lower speeds below 10 meters ..... I was also surprised at the disparity between the Dropsond measurements and the post damage analysis assigned wind speeds too.

[liquidstl]

Surprisingly, they found little difference in wind damage from Slidell to Boluxi.. Pretty shocking to me. The EF scale assumes open terrain and a 10 meter height, but most structures survey where not in open terrain and were not at 10 Meters. Therefore they had to adjust the wind speed to cause various degrees of damage( higher) for the suburban environment than the open environment.. I understand that the rougher terrain causes significant boundry layer changes, but one would think that the w

[liquidstl]

Just Read a Post analysis wind damage survey in which they applied the EF scale to the wind damage.... They had 1 or two conventions that I don't think I understood... maybe I'll re read it tomorrow or something.

Anyway they studied 4 types of buildings and in general found that 3 second gusts were less than or equal to 92 mph, but that some reached 110 mph. They found that the maximum gusts over land given the 20% error in the EF scale was 120 mph.

[liquidstl]

Thanks For all the info!

[liquidstl]

@stormhunter27 For a long time I've wanted to set up an anemometer array and have footage rolling simultaniously, so I was thrilled when he mentioned the deployable towers

[liquidstl]

@stormhunter27 As far as ground based locations The Maximum ( unofficial) gust was 117 KTS near the Mouth of the pearl river ( not sure where this is?) The Pascagula Civel Defense measured a 119 mph gust and at 8 AM there were 94 mph sustained winds in gulf port with gusts to 100mph recorded.

Whenever I watch extreme footage like this I Really want to know precisely what the conditions are haha.

I actually talked with Tim MIller briefly this spring at JIm's chaser party

[liquidstl]

@stormhunterw27 After I posted those initial comments, I reread the NCH Hurricane Katrina technical report. Officially they have it at a 120 mph 1 min average at its 3rd & final landfall..... Their dropsonds measured a 1 minute average of 99 KTS at this time at 10 Meters... thee 150 meter best fit from dropsonds put maximum 1 minute winds at 90 - 95 kts..... They have the official intensity at 105 kts/ 120 mph to assume that they did not hit the maximum 1 minute wind with their dropsonds