Take a look at....

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chris_fit
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Take a look at....

#1 Postby chris_fit » Sun Sep 14, 2003 6:15 pm

this wobble to the west last 2 frames!

http://www.ssd.noaa.gov/PS/TROP/DATA/RT ... -loop.html


Cheers!
~Chris
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#2 Postby tallbunch » Sun Sep 14, 2003 6:21 pm

my computer sucks and would take a hour to download- what it is doing?
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ColdFront77

#3 Postby ColdFront77 » Sun Sep 14, 2003 6:22 pm

Tallbunch, it is doing what he stated. The center of Hurricane Isabel has moved a bit to the due west, at this time just a wobble, need more frames.
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#4 Postby wow » Sun Sep 14, 2003 6:25 pm

see it as well.

that would be somewhat of a surprise if it starts moving west again.
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#5 Postby chris_fit » Sun Sep 14, 2003 6:25 pm

Just doesnt want to cross that 25N line!

Cheers!
~Chris
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#6 Postby Air Force Met » Sun Sep 14, 2003 6:26 pm

Two words:

trochoidal motion
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#7 Postby ColdFront77 » Sun Sep 14, 2003 6:27 pm

The center of Isabel as moved 0.2 degrees northward, 0.4 degrees westward between the advisory at 5:00 PM and 6:45 PM Eastern Time.
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#8 Postby chris_fit » Sun Sep 14, 2003 6:27 pm

Air Force Met wrote:Two words:

trochoidal motion


Whats the in English?

Cheers!
~Chris
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#9 Postby Deenac813 » Sun Sep 14, 2003 6:28 pm

ColdFront77 wrote:The center of Isabel as moved 0.2 degrees northward, 0.4 degrees westward between the advisory at 5:00 PM and 6:45 PM Eastern Time.


Which would be WNW right?? Just as the NHC states..
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#10 Postby ColdFront77 » Sun Sep 14, 2003 6:30 pm

Sure. It will be something to continue to watch, in any event.
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#11 Postby lp8391 » Sun Sep 14, 2003 6:37 pm

being new here, and not knowing much about weather, I have no idea if this is a valid question, but shouldn't this thing turn soon, if Ga, and FL are to be in the clear?
any info would be appreciated
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#12 Postby Air Force Met » Sun Sep 14, 2003 6:38 pm

Trochoidal motions are oscillations in the mean path. WHen looking at the motion of a storm...we have to look at the 12-24 hour average unless you know for a fact it has turned. You cant just see one or two pics...because they are just oscillations more than likely. Matter of fact...if you remember...how many posts have been on this board the past 2 days about moving back to the west? IF you could look at a 2 day sat loop what would you see? An extended gradual W then WNW curve with little w bumps every once in a while. THose bumps are trochoidal motions.

I've used the analogy of the spinning top that is not perfectly balanced. IT doesn't spin perfectly. IT moved in a line but around a little in a general direction. That is what hurricanes do.
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#13 Postby chris_fit » Sun Sep 14, 2003 6:40 pm

Air Force Met wrote:Trochoidal motions are oscillations in the mean path. WHen looking at the motion of a storm...we have to look at the 12-24 hour average unless you know for a fact it has turned. You cant just see one or two pics...because they are just oscillations more than likely. Matter of fact...if you remember...how many posts have been on this board the past 2 days about moving back to the west? IF you could look at a 2 day sat loop what would you see? An extended gradual W then WNW curve with little w bumps every once in a while. THose bumps are trochoidal motions.

I've used the analogy of the spinning top that is not perfectly balanced. IT doesn't spin perfectly. IT moved in a line but around a little in a general direction. That is what hurricanes do.


Thank you for the clear explanation! Keep up the good work!

Cheers!
~Chris
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#14 Postby Deenac813 » Sun Sep 14, 2003 6:40 pm

As always Air Force Met.. THANK YOU!! you explain things in laymans terms & I really understand.. I have learned alot from you this weekend & I appreciate it!
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Anonymous

#15 Postby Anonymous » Sun Sep 14, 2003 6:42 pm

Air Force Met wrote:Trochoidal motions are oscillations in the mean path. WHen looking at the motion of a storm...we have to look at the 12-24 hour average unless you know for a fact it has turned. You cant just see one or two pics...because they are just oscillations more than likely. Matter of fact...if you remember...how many posts have been on this board the past 2 days about moving back to the west? IF you could look at a 2 day sat loop what would you see? An extended gradual W then WNW curve with little w bumps every once in a while. THose bumps are trochoidal motions.

I've used the analogy of the spinning top that is not perfectly balanced. IT doesn't spin perfectly. IT moved in a line but around a little in a general direction. That is what hurricanes do.


Funny when she was moving due west and wobbled wnw it was a trend! The trend didn't come till 3-4 days later. You have to admit she is moving a lot more west today than she was yesterday. She is all over the place and it seems very unstable for her.

Btw NHC looked at her motion of wnw for like 6 hours and concluded it was wnw. You said 12-24.
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#16 Postby dixiebreeze » Sun Sep 14, 2003 6:45 pm

Thanks Air Force Met, a very good explanation of trochodial motion. Helps keep things in perspective.
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chadtm80

#17 Postby chadtm80 » Sun Sep 14, 2003 6:47 pm

Her OVERALL motion is wnw, just as Airforcemet stated.. West wobles, but general motion is wnw. no doubt about it.
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#18 Postby chris_fit » Sun Sep 14, 2003 9:14 pm

Yet ANOTHER wobble to the Due West in progress right now....
http://www.ssd.noaa.gov/PS/TROP/DATA/RT/float-wv-loop.html

Take a look at frames 10-13

Cheers!
~Chris
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