Re: how do you get the screws out of the windshield bracket in a jeep wrangler tj
 

On Wed, 03 May 2006 19:13:04 -0600, Earle Horton wrote:

> There is no
> reason a storm could not cross the equator.

Coriolis effect.


If Coriolis force drives weather systems in one direction in the northern
hemisphere and another in the southern does this mean that hurricanes and
other weather systems cannot cross the Equator?

Worried about hurricanes crossing the equator ? The Coriolis force is
what we call an apparent force - it handles the problem that the earth
is spinning and thus a point on the globe is always changing direction
or always accelerating. You may also view Coriolis as a consequence of
the conservation of angular momentum. At the equator you have a great
deal as you are rotating about 25,000 miles in a day while someone on
the poles is not moving anywhere in the same period. From your and my
perspective air, rockets, and aircraft, are all deflected to the right
in the northern hemisphere and to the left in the southern. (Yes, they
correct for Coriolis when they shoot artillery shells!) The Coriolis
"force" is a maximum at the poles and zero at the equator.
Observations show that no hurricanes form within 5 degrees latitude of
the equator. People argue that the Coriolis force is too weak there to
get air to rotate around a low pressure rather than flow from high to
low pressure, which it does initially. If you can't get the air to
rotate you can't get a storm. This is a reason why genesis does not
occur at low latitudes but it does not explain why a developed
hurricane does not cross the equator.. Could a hurricane cross ? Yes,
because a well developed storm has plenty of spin that would dominate
the weak Coriolis force near there. If it crossed the Coriolis force
would be working against the initial direction of the spin, but it
would be dominated by what we call the relative vorticity of the
storm. Have we seen this happen ? Hurricanes can move south and get
close to the equator but I cannot find an example of one crossing in
the Atlantic or eastern Pacific. In the Indian Ocean some come closer
to pulling off this trick. Why don't they cross ? The variation in
Coriolis with latitude - called the Beta effect - actually will move a
hurricane to the NW in the northern hemisphere even if there is no
large scale wind pushing the storm along ! So, Coriolis not onlyseems
to be a necessary ingredient to make a storm, but it may also pull
them away from the equator making the crossing event a tough one to
pull off.

Gary Barnes, Professor of Meteorology Department of Meteorology
University of Hawaii, Honolulu HI 96822


-- 30 --

Re: how do you get the screws out of the windshield bracket in a jeep wrangler tj
 

So Bill is Correct?
Coasty

"Pink Freud" <psychokiller@terminal-analysis.org> wrote in message
news:5zc6g.116154$7a.55098@pd7tw1no...
> On Wed, 03 May 2006 19:13:04 -0600, Earle Horton wrote:
>
>> There is no
>> reason a storm could not cross the equator.
>
> Coriolis effect.
>
>
> If Coriolis force drives weather systems in one direction in the northern
> hemisphere and another in the southern does this mean that hurricanes and
> other weather systems cannot cross the Equator?
>
> Worried about hurricanes crossing the equator ? The Coriolis force is
> what we call an apparent force - it handles the problem that the earth
> is spinning and thus a point on the globe is always changing direction
> or always accelerating. You may also view Coriolis as a consequence of
> the conservation of angular momentum. At the equator you have a great
> deal as you are rotating about 25,000 miles in a day while someone on
> the poles is not moving anywhere in the same period. From your and my
> perspective air, rockets, and aircraft, are all deflected to the right
> in the northern hemisphere and to the left in the southern. (Yes, they
> correct for Coriolis when they shoot artillery shells!) The Coriolis
> "force" is a maximum at the poles and zero at the equator.
> Observations show that no hurricanes form within 5 degrees latitude of
> the equator. People argue that the Coriolis force is too weak there to
> get air to rotate around a low pressure rather than flow from high to
> low pressure, which it does initially. If you can't get the air to
> rotate you can't get a storm. This is a reason why genesis does not
> occur at low latitudes but it does not explain why a developed
> hurricane does not cross the equator.. Could a hurricane cross ? Yes,
> because a well developed storm has plenty of spin that would dominate
> the weak Coriolis force near there. If it crossed the Coriolis force
> would be working against the initial direction of the spin, but it
> would be dominated by what we call the relative vorticity of the
> storm. Have we seen this happen ? Hurricanes can move south and get
> close to the equator but I cannot find an example of one crossing in
> the Atlantic or eastern Pacific. In the Indian Ocean some come closer
> to pulling off this trick. Why don't they cross ? The variation in
> Coriolis with latitude - called the Beta effect - actually will move a
> hurricane to the NW in the northern hemisphere even if there is no
> large scale wind pushing the storm along ! So, Coriolis not onlyseems
> to be a necessary ingredient to make a storm, but it may also pull
> them away from the equator making the crossing event a tough one to
> pull off.
>
> Gary Barnes, Professor of Meteorology Department of Meteorology
> University of Hawaii, Honolulu HI 96822
>
>
> -- 30 --
>
>

Re: how do you get the screws out of the windshield bracket in a jeep wrangler tj
 

So Bill is Correct?
Coasty

"Pink Freud" <psychokiller@terminal-analysis.org> wrote in message
news:5zc6g.116154$7a.55098@pd7tw1no...
> On Wed, 03 May 2006 19:13:04 -0600, Earle Horton wrote:
>
>> There is no
>> reason a storm could not cross the equator.
>
> Coriolis effect.
>
>
> If Coriolis force drives weather systems in one direction in the northern
> hemisphere and another in the southern does this mean that hurricanes and
> other weather systems cannot cross the Equator?
>
> Worried about hurricanes crossing the equator ? The Coriolis force is
> what we call an apparent force - it handles the problem that the earth
> is spinning and thus a point on the globe is always changing direction
> or always accelerating. You may also view Coriolis as a consequence of
> the conservation of angular momentum. At the equator you have a great
> deal as you are rotating about 25,000 miles in a day while someone on
> the poles is not moving anywhere in the same period. From your and my
> perspective air, rockets, and aircraft, are all deflected to the right
> in the northern hemisphere and to the left in the southern. (Yes, they
> correct for Coriolis when they shoot artillery shells!) The Coriolis
> "force" is a maximum at the poles and zero at the equator.
> Observations show that no hurricanes form within 5 degrees latitude of
> the equator. People argue that the Coriolis force is too weak there to
> get air to rotate around a low pressure rather than flow from high to
> low pressure, which it does initially. If you can't get the air to
> rotate you can't get a storm. This is a reason why genesis does not
> occur at low latitudes but it does not explain why a developed
> hurricane does not cross the equator.. Could a hurricane cross ? Yes,
> because a well developed storm has plenty of spin that would dominate
> the weak Coriolis force near there. If it crossed the Coriolis force
> would be working against the initial direction of the spin, but it
> would be dominated by what we call the relative vorticity of the
> storm. Have we seen this happen ? Hurricanes can move south and get
> close to the equator but I cannot find an example of one crossing in
> the Atlantic or eastern Pacific. In the Indian Ocean some come closer
> to pulling off this trick. Why don't they cross ? The variation in
> Coriolis with latitude - called the Beta effect - actually will move a
> hurricane to the NW in the northern hemisphere even if there is no
> large scale wind pushing the storm along ! So, Coriolis not onlyseems
> to be a necessary ingredient to make a storm, but it may also pull
> them away from the equator making the crossing event a tough one to
> pull off.
>
> Gary Barnes, Professor of Meteorology Department of Meteorology
> University of Hawaii, Honolulu HI 96822
>
>
> -- 30 --
>
>

Re: how do you get the screws out of the windshield bracket in a jeep wrangler tj
 

So Bill is Correct?
Coasty

"Pink Freud" <psychokiller@terminal-analysis.org> wrote in message
news:5zc6g.116154$7a.55098@pd7tw1no...
> On Wed, 03 May 2006 19:13:04 -0600, Earle Horton wrote:
>
>> There is no
>> reason a storm could not cross the equator.
>
> Coriolis effect.
>
>
> If Coriolis force drives weather systems in one direction in the northern
> hemisphere and another in the southern does this mean that hurricanes and
> other weather systems cannot cross the Equator?
>
> Worried about hurricanes crossing the equator ? The Coriolis force is
> what we call an apparent force - it handles the problem that the earth
> is spinning and thus a point on the globe is always changing direction
> or always accelerating. You may also view Coriolis as a consequence of
> the conservation of angular momentum. At the equator you have a great
> deal as you are rotating about 25,000 miles in a day while someone on
> the poles is not moving anywhere in the same period. From your and my
> perspective air, rockets, and aircraft, are all deflected to the right
> in the northern hemisphere and to the left in the southern. (Yes, they
> correct for Coriolis when they shoot artillery shells!) The Coriolis
> "force" is a maximum at the poles and zero at the equator.
> Observations show that no hurricanes form within 5 degrees latitude of
> the equator. People argue that the Coriolis force is too weak there to
> get air to rotate around a low pressure rather than flow from high to
> low pressure, which it does initially. If you can't get the air to
> rotate you can't get a storm. This is a reason why genesis does not
> occur at low latitudes but it does not explain why a developed
> hurricane does not cross the equator.. Could a hurricane cross ? Yes,
> because a well developed storm has plenty of spin that would dominate
> the weak Coriolis force near there. If it crossed the Coriolis force
> would be working against the initial direction of the spin, but it
> would be dominated by what we call the relative vorticity of the
> storm. Have we seen this happen ? Hurricanes can move south and get
> close to the equator but I cannot find an example of one crossing in
> the Atlantic or eastern Pacific. In the Indian Ocean some come closer
> to pulling off this trick. Why don't they cross ? The variation in
> Coriolis with latitude - called the Beta effect - actually will move a
> hurricane to the NW in the northern hemisphere even if there is no
> large scale wind pushing the storm along ! So, Coriolis not onlyseems
> to be a necessary ingredient to make a storm, but it may also pull
> them away from the equator making the crossing event a tough one to
> pull off.
>
> Gary Barnes, Professor of Meteorology Department of Meteorology
> University of Hawaii, Honolulu HI 96822
>
>
> -- 30 --
>
>

Re: how do you get the screws out of the windshield bracket in a jeep wrangler tj
 

On Thu, 04 May 2006 05:49:54 -0400, Coasty wrote:

> So Bill is Correct?
> Coasty

I have no idea what he said.

Basically, hurricanes /can/ indeed cross the equator, but evidently seldom
do or at least are not observed doing so.


>> There is no reason a storm could not cross the equator. The
>> clockwise/counter-clockwise effect is only strong enough to give storms
>> their initial orientation. It is not strong enough to stop a storm
>> dead
>> in its tracks, or to cause it to dissipate, as many slack jawed yokels
>> believe.

> Earle



> "Pink Freud" <psychokiller@terminal-analysis.org> wrote in message news:

>> If you can't get the air to rotate you can't get a storm. This is a
>> reason why genesis does not occur at low latitudes but it does not
>> explain why a developed hurricane does not cross the equator..

// Could
>> a hurricane cross ? Yes, because a well developed storm has plenty
>> of spin that would dominate the weak Coriolis force near there. //


>> If it crossed the Coriolis force would be working against the
>> initial direction of the spin, but it would be dominated by what we
>> call the relative vorticity of the storm. Have we seen this happen ?
>> Hurricanes can move south and get close to the equator but I cannot
>> find an example of one crossing in the Atlantic or eastern Pacific.
>> In the Indian Ocean some come closer to pulling off this trick. Why
>> don't they cross ? The variation in Coriolis with latitude - called
>> the Beta effect - actually will move a hurricane to the NW in the
>> northern hemisphere even if there is no large scale wind pushing the
>> storm along !


// So, Coriolis not only seems to be a necessary
>> ingredient to make a storm, but it may also pull them away from the
>> equator making the crossing event a tough one to pull off. //


>>
>> Gary Barnes, Professor of Meteorology Department of Meteorology
>> University of Hawaii, Honolulu HI 96822
>>
>>
>> -- 30 --
>>
>>

Re: how do you get the screws out of the windshield bracket in a jeep wrangler tj
 

On Thu, 04 May 2006 05:49:54 -0400, Coasty wrote:

> So Bill is Correct?
> Coasty

I have no idea what he said.

Basically, hurricanes /can/ indeed cross the equator, but evidently seldom
do or at least are not observed doing so.


>> There is no reason a storm could not cross the equator. The
>> clockwise/counter-clockwise effect is only strong enough to give storms
>> their initial orientation. It is not strong enough to stop a storm
>> dead
>> in its tracks, or to cause it to dissipate, as many slack jawed yokels
>> believe.

> Earle



> "Pink Freud" <psychokiller@terminal-analysis.org> wrote in message news:

>> If you can't get the air to rotate you can't get a storm. This is a
>> reason why genesis does not occur at low latitudes but it does not
>> explain why a developed hurricane does not cross the equator..

// Could
>> a hurricane cross ? Yes, because a well developed storm has plenty
>> of spin that would dominate the weak Coriolis force near there. //


>> If it crossed the Coriolis force would be working against the
>> initial direction of the spin, but it would be dominated by what we
>> call the relative vorticity of the storm. Have we seen this happen ?
>> Hurricanes can move south and get close to the equator but I cannot
>> find an example of one crossing in the Atlantic or eastern Pacific.
>> In the Indian Ocean some come closer to pulling off this trick. Why
>> don't they cross ? The variation in Coriolis with latitude - called
>> the Beta effect - actually will move a hurricane to the NW in the
>> northern hemisphere even if there is no large scale wind pushing the
>> storm along !


// So, Coriolis not only seems to be a necessary
>> ingredient to make a storm, but it may also pull them away from the
>> equator making the crossing event a tough one to pull off. //


>>
>> Gary Barnes, Professor of Meteorology Department of Meteorology
>> University of Hawaii, Honolulu HI 96822
>>
>>
>> -- 30 --
>>
>>

Re: how do you get the screws out of the windshield bracket in a jeep wrangler tj
 

On Thu, 04 May 2006 05:49:54 -0400, Coasty wrote:

> So Bill is Correct?
> Coasty

I have no idea what he said.

Basically, hurricanes /can/ indeed cross the equator, but evidently seldom
do or at least are not observed doing so.


>> There is no reason a storm could not cross the equator. The
>> clockwise/counter-clockwise effect is only strong enough to give storms
>> their initial orientation. It is not strong enough to stop a storm
>> dead
>> in its tracks, or to cause it to dissipate, as many slack jawed yokels
>> believe.

> Earle



> "Pink Freud" <psychokiller@terminal-analysis.org> wrote in message news:

>> If you can't get the air to rotate you can't get a storm. This is a
>> reason why genesis does not occur at low latitudes but it does not
>> explain why a developed hurricane does not cross the equator..

// Could
>> a hurricane cross ? Yes, because a well developed storm has plenty
>> of spin that would dominate the weak Coriolis force near there. //


>> If it crossed the Coriolis force would be working against the
>> initial direction of the spin, but it would be dominated by what we
>> call the relative vorticity of the storm. Have we seen this happen ?
>> Hurricanes can move south and get close to the equator but I cannot
>> find an example of one crossing in the Atlantic or eastern Pacific.
>> In the Indian Ocean some come closer to pulling off this trick. Why
>> don't they cross ? The variation in Coriolis with latitude - called
>> the Beta effect - actually will move a hurricane to the NW in the
>> northern hemisphere even if there is no large scale wind pushing the
>> storm along !


// So, Coriolis not only seems to be a necessary
>> ingredient to make a storm, but it may also pull them away from the
>> equator making the crossing event a tough one to pull off. //


>>
>> Gary Barnes, Professor of Meteorology Department of Meteorology
>> University of Hawaii, Honolulu HI 96822
>>
>>
>> -- 30 --
>>
>>