APOD: Swirling Around the Eye of Hurricane... (2017 Sep 10)

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APOD Robot
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APOD: Swirling Around the Eye of Hurricane... (2017 Sep 10)

Postby APOD Robot » Sun Sep 10, 2017 4:06 am

Image Swirling Around the Eye of Hurricane Irma

Explanation: Why does a hurricane have an eye at its center? No one is yet sure. What happens in and around a hurricane's eye is well documented, though. Warm air rises around the eye's edges, cools, swirls, and spreads out over the large storm, sinking primarily at the far edges. Inside the low-pressure eye, air also sinks and warms -- which causes evaporation, calm, and clearing -- sunlight might even stream through. Just at the eye's edge is a towering eyewall, the area of the highest winds. It is particularly dangerous to go outside when the tranquil eye passes over because you are soon to experience, again, the storm's violent eyewall. Featured is one of the most dramatic videos yet taken of an eye and rotating eyewall. The time-lapse video was taken from space by NASA's GOES-16 satellite last week over one of the most powerful tropical cyclones in recorded history: Hurricane Irma. Hurricanes can be extremely dangerous and their perils are not confined to the storm's center.

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Re: APOD: Swirling Around the Eye of Hurricane... (2017 Sep 10)

Postby Boomer12k » Sun Sep 10, 2017 7:49 am

It is a Vortex...they have a more hollow central area...from the spinning...just like whirlpools, and some eddy currents....a whirlwind...dust devil, tornado, etc...
I assume the rising air that goes up over the top also helps the separation, and the formation of the eye... but I don't think is the whole story. Just my lousy opinion...

Awesome video...

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Re: APOD: Swirling Around the Eye of Hurricane... (2017 Sep 10)

Postby ta152h0 » Sun Sep 10, 2017 9:08 am

Holly Cowabunga !!
Wolf Kotenberg

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Re: APOD: Swirling Around the Eye of Hurricane... (2017 Sep 10)

Postby heehaw » Sun Sep 10, 2017 10:20 am

Boomer12k wrote: Just my lousy opinion...
*
Your opinion sounds good to me! There are wispy tornados on Mars. And I've watched whirlwinds often in a corner of buildings at my job. There are complex phenomena for which there is no compact explanation - the most interesting being the jets out the poles of both new stars being 'born' and quasars. As our mathematical models of such phenomena improve, one expects the same behavior to emerge, that's all. Just no simple equation for it. Oh and BY THE WAY: is the fact that Irma is hitting Florida caused by our password?

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Re: APOD: Swirling Around the Eye of Hurricane... (2017 Sep 10)

Postby neufer » Sun Sep 10, 2017 11:39 am

"O Grammar!" crater ladle gull historically, "Water bag icer gut! A nervous sausage bag ice!"

"Battered lucky chew whiff, sweat hard," setter bloat-Thursday woof, wetter wicket small honors phase.
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Re: APOD: Swirling Around the Eye of Hurricane... (2017 Sep 10)

Postby De58te » Sun Sep 10, 2017 12:41 pm

Likewise, Holy Cowabunga! I was going to say great vid, but keep in mind it is already a killer of 20 people, and that number likely will go up. Thoughts are of the Floridians, stay safe. And the Puerto Ricans and the other islanders affected.

ronterf

Re: APOD: Swirling Around the Eye of Hurricane... (2017 Sep 10)

Postby ronterf » Sun Sep 10, 2017 9:53 pm

The spinning cylindrical force is spinning the heavy wet air outward while cooler air from above is falling into the void thus creating added outward pressure increasing the eye size. water is the key factor to the hurricane having an eye, that is why they dissipate over land.

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neufer
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Re: APOD: Swirling Around the Eye of Hurricane... (2017 Sep 10)

Postby neufer » Mon Sep 11, 2017 12:12 am

ronterf wrote:
The spinning cylindrical force is spinning the heavy wet air outward while cooler air from above is falling into the void thus creating added outward pressure increasing the eye size. water is the key factor to the hurricane having an eye, that is why they dissipate over land.

Water vapor condensation is the key factor to the hurricane having an eye:

Heating due to water vapor condensation produces a high pressure center with outward flow in the upper troposphere.

This is compensated for by a low pressure center with inward flow in the lower troposphere.

The eye wall occurs where centrifugal force from spin up of inward flow just cancels the low pressure in the lower troposphere.

Damp air can only get into the eye by first rising, dumping its water vapor as rain and then falling in from the top as warm dry air.
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Re: APOD: Swirling Around the Eye of Hurricane... (2017 Sep 10)

Postby Soggy Bottom Stomp » Mon Sep 11, 2017 5:35 pm

neufer wrote:
Heating due to water vapor condensation produces a high pressure center with outward flow in the upper troposphere.

This is compensated for by a low pressure center with inward flow in the lower troposphere.

The eye wall occurs where centrifugal force from spin up of inward flow just cancels the low pressure in the lower troposphere.

Damp air can only get into the eye by first rising, dumping its water vapor as rain and then falling in from the top as warm dry air.


Put it to music and you've got a new dance craze.

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neufer
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Just wait....

Postby neufer » Wed Sep 13, 2017 3:05 pm

Click to play embedded YouTube video.
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Re: APOD: Swirling Around the Eye of Hurricane... (2017 Sep 10)

Postby geckzilla » Wed Sep 13, 2017 9:24 pm

I wonder if his house survived. Even without GW though, that's been a risky place to own a home. The amount of time it's going to take to prove this guy wrong will be enough he'll be dead. Maybe if he is so sure about it he'll will his great-grandchildren the house and they'll have a nice piece of ocean floor to wonder about.
Just call me "geck" because "zilla" is like a last name.


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