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Tropical Depression Don


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Take a look at the recent rapid scan...it looks like a LLC has formed (quite strong as well ) to the SW of the Isle of Youth. You can see it very briefly when the old convection died out and before the new storms fired over it.

http://wwwghcc.msfc.nasa.gov/cgi-bin/get-goes?satellite=GOES-E%20CONUS&lat=20&lon=-83&info=vis&zoom=1&width=1024&height=800&type=Animation&quality=90&numframes=25

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  On 7/26/2011 at 6:25 PM, wxmx said:

MW still doesn't show an LLC, but there's a non-"land shadow" dark spot to the SE of the Isle of Youth.

Yeah, I've been staring at that for like 10 min... it almost looks like there are three parallel arcs, but that's not a "normal" pattern.

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  On 7/26/2011 at 6:26 PM, am19psu said:

Yeah, I've been staring at that for like 10 min... it almost looks like there are three parallel arcs, but that's not a "normal" pattern.

That threw me off as well... at least partially could be attributed to the satellite sweep direction, but that three arcs are rather well defined...not sure if anything can be concluded from that.

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  On 7/26/2011 at 6:30 PM, wxmx said:

That threw me off as well... at least partially could be attributed to the satellite sweep direction, but that three arcs are rather well defined...not sure if anything can be concluded from that.

Yea I think its just the satellite sweet direction that is causing the arcing pattern. We will probably be able to discern a lot more from the Cuban radar than this most recent TRMM pass.

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  On 7/26/2011 at 6:39 PM, phil882 said:

Yea I think its just the satellite sweet direction that is causing the arcing pattern. We will probably be able to discern a lot more from the Cuban radar than this most recent TRMM pass.

I'm not sure... you can see the same pattern in the visible satellite

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HPC discussion suggests their positioning/forecast of 90L is a product of the NHC forecast.

  Quote
THE POSITION OF ALL TROPICAL

FEATURES WAS COORDINATED WITH NHC AT 17Z/1 PM EDT. SEE THE LATEST

TROPICAL WEATHER OUTLOOKS FROM NHC CONCERNING THIS

SYSTEM...CURRENTLY SOUTHWEST OF CUBA.

ROTH

post-138-0-86715100-1311705748.gif

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  On 7/26/2011 at 6:47 PM, Snowlover123 said:

You can always count on the HWRF to make one of the most unrealistic scenarios that there could possibly be. :lol:

Can I repost this in 3 days?? ;)

HWRF has made some pretty big improvements in the last couple years. It has toned WAY down on it's supercane progs. That said, I made my forecast BEFORE this run came out, so I'm a bit biased that a model followed my thinking! :P

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  On 7/26/2011 at 6:41 PM, am19psu said:

I'm not sure... you can see the same pattern in the visible satellite

SSMIS pass also went through about 30 minutes previous to the TRMM pass and it also shows some arcing bands in the low levels with some sort of axis around 21N 83W. Looks like its organizing nicely.

1rqcs2.jpg

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