GFDL for 90L

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MortisFL
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GFDL for 90L

#1 Postby MortisFL » Fri May 21, 2004 6:06 pm

Sends it into the Pacific then back into the west Caribbean in 126hrs... :?:
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Derek Ortt

#2 Postby Derek Ortt » Fri May 21, 2004 6:08 pm

Big problems with the GFDL. It spins up 2 seperate systems, merging the EPAC with the Carib, with EPAC being dominant. Dont worry though, this is known as a problem and should be addressed
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#3 Postby HURAKAN » Fri May 21, 2004 6:16 pm

The GFDL, as always, wondering about everything and doing crazy things.

Sandy Delgado
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#4 Postby MWatkins » Fri May 21, 2004 6:37 pm

Hey Mortis...

The text version of yesterdays run dropped it all together. The graphical display on the PSU does exactly what you mentioned. I think it was more a case of the model not representing the broad area of low pressure too well.

Supposedly they made some improvements to the model to keep it from dropping systems right away...but in this case I think the model bugging out on a very iffy May system is OK and I give it a pass.

But...if it starts droppping well-organized tropical depressions in the Central Atlantic in August...then it'll be another case of here we go again.

MW
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Derek Ortt

#5 Postby Derek Ortt » Fri May 21, 2004 6:39 pm

GFDL is alos a sigma model and sigma models do not perform very well over high mountain regions
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#6 Postby Brent » Fri May 21, 2004 6:41 pm

LOL! I think the GFDL may replace the GFS for it's goofy forecasts. :lol: :roll:
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#7 Postby MWatkins » Fri May 21, 2004 6:50 pm

Derek Ortt wrote:GFDL is alos a sigma model and sigma models do not perform very well over high mountain regions


I think all of the sigma models share this problem (GFS/ETA/NOGAPS/UKMET). I guess on the learge scale this is balanced some. They supposedly made changes to the GFS to better handle mountians and flow in/around/over...

http://meted.ucar.edu/nwp/pcu2/gfsannounce200402.htm

But I concede it could eaisly be a problem with the GFDL in a smaller scale environment when initialized with a low near a bunch of mountians.

MW
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