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Author Topic:   To our members in the Caribbean hunker down; if in Florida head north..
Aussie
Member
Posts: 275
From: FL USA
Joined: 10-02-2006


Message 49 of 53 (819610)
09-13-2017 10:51 AM
Reply to: Message 48 by Pressie
09-13-2017 6:19 AM


Re: Hurricane Size Comparison
Actually, around one in a hundred hurricanes or cyclones or typhoons or whatever you call it hitting land in the northern hemisphere rotates clockwise. Maybe it is because the original storm started just south of the equator?
This is hardly worth a nitpick, but I can't bring myself to believe this.
Coriolis effect doesn't care where you START, it only cares where you CURRENTLY are. Winds originally deflected to the left in the Southern hemisphere start a deflection to the right as they begin to pass some distance North of the Equator.
I'm not an Atmospheric physicist, and could be wrong but...
If you are correct in this I'd love to see some supporting info if you could provide it. An initial google search isn't helping me here. Thanks!

"...heck is a small price to pay for the truth"

This message is a reply to:
 Message 48 by Pressie, posted 09-13-2017 6:19 AM Pressie has not replied

Replies to this message:
 Message 50 by NoNukes, posted 09-13-2017 4:21 PM Aussie has replied

  
Aussie
Member
Posts: 275
From: FL USA
Joined: 10-02-2006


Message 51 of 53 (819731)
09-14-2017 10:57 AM
Reply to: Message 50 by NoNukes
09-13-2017 4:21 PM


Re: Hurricane Size Comparison
Yes, but the Coriolis effect is important during the birth of the storm. Beyond that, the implication of your statement is that cyclones and hurricanes reverse direction as they cross the equator. I don't believe that is the case.
Hey NoNukes, This is correct but also incomplete. Coriolis is important during the formation of any any pressure system, High or Low, but together with other factors (Pressure Gradient Force, speed of rotation of the planet, rate of movement of the air mass, etc. remains a dominant effective force throughout the entirety of the system's life cycle.
The strength of Coriolis varies with the Sine of the latitude and is effectively zero at the Equator. Straightline winds can and certainly do change direction as they cross the equator. For example, the SouthEAST Trade winds in the Southern Hemisphere become the SouthWEST Monsoon winds that blow over much of western Africa in the Northern Hemisphere. They annoyingly help generate massive clusters of thunderstorms that drift west off the African coast as Easterly Waves that often become these tropical revolving storms.
But during their passage across the Atlantic, Coriolis deflects the entire system to the right (in the Northern Hemisphere), usually in conjunction with the Bermuda High (Clockwise rotation). So because of Coriolis you will almost inevitably see Tropical revolving systems move AWAY from the equator, not towards it. In the very rare event that a tropical revolving system is forced across the Equator, it would be more likely that the revolving motion would be entirely dampened.
Again, I'm not a real Meteorologist, and could be wrong, but I don't think I am in this case.

"...heck is a small price to pay for the truth"

This message is a reply to:
 Message 50 by NoNukes, posted 09-13-2017 4:21 PM NoNukes has replied

Replies to this message:
 Message 52 by NoNukes, posted 09-16-2017 9:46 AM Aussie has not replied

  
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