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Atlantic Tropical Action 2011 - Part II


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A bit of a hint of things to come from CARCAH this morning concerning our disturbance over the Yucatan...:scooter:

NOUS42 KNHC 261515

WEATHER RECONNAISSANCE FLIGHTS

CARCAH, NATIONAL HURRICANE CENTER, MIAMI, FL.

1115 AM EDT SUN 26 JUNE 2011

SUBJECT: TROPICAL CYCLONE PLAN OF THE DAY (TCPOD)

VALID 27/1100Z TO 28/1100Z JUNE 2011

TCPOD NUMBER.....11-026

I. ATLANTIC REQUIREMENTS

1. NEGATIVE RECONNAISSANCE REQUIREMENTS.

2. OUTLOOK FOR SUCCEEDING DAY: POSSIBLE LOW-LEVEL INVEST

IN BAY OF CAMPECHE NEAR 21.0N 95.0W FOR 28/1800Z.

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This system really poses some similarities to the genesis of Gert back in 2005. Both straddled the Yucatan Peninsula and had to deal with an upper level feature to their west. Gert went on to become a loosely organized tropical storm, and I'd say the current disturbance has an increasingly likely chance of doing the same.

Pre-Gert Disturbance

11jxixs.jpg

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This system really poses some similarities to the genesis of Gert back in 2005. Both straddled the Yucatan Peninsula and had to deal with an upper level feature to their west. Gert went on to become a loosely organized tropical storm, and I'd say the current disturbance has an increasingly likely chance of doing the same.

Gert is a pretty interesting analog. I don't know the synoptic details of that system all that well, but I remember it was spinning up rapidly right before it made landfall. I was down at HRD at the time, and the last eyewall penetration from the NOAA plane had severe turbulence.

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Guys, we don't need to post the NAM or the DGEX. They are not meant for warm core systems. That might change with the new NAM that is running parallel right now (I've not seen any documentation for its performance in the tropics), but for now, can we please limit model postings to things that are actually relevant. Thanks.

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Hey folks, if you are going to post models, please at least use numerical guidance that is for warm core, deep tropical systems and not meso models. Those are useless and add nothing to the conversation at all. Meanwhile, the 12Z Euro ensembles continue to suggest a more organized and further N tracking system...

post-32-0-91102600-1309120092.gif

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I've updated my tropical weather blog discussing the potential of the Yucatan disturbance becoming a tropical cyclone in the Gulf of Mexico over the next few days. Let me know what you guys think. weight_lift.gif

http://philstropicalweatherblog.wordpress.com/

Nice post-- well-written and explained, I think!

I'm not too excited about this one. My hunch is that it's too far S and doesn't have enough "shape" to it yet. I just don't see it spinning up into anything interesting, given the small amount of space and time it will have to work with. That's just my gut feeling, unsupported by science or models.

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Nice post-- well-written and explained, I think!

I'm not too excited about this one. My hunch is that it's too far S and doesn't have enough "shape" to it yet. I just don't see it spinning up into anything interesting, given the small amount of space and time it will have to work with. That's just my gut feeling, unsupported by science or models.

Thanks!

I think the "shape" will become more obvious once convection starts to develop over the GOM during the diurnal max. Right now its not surprising things aren't very organized given the westerly winds aloft over the Bay of Campeche. Despite what the GFS is projecting, I'm not sure how fast the anticyclone is going to build in place. Also, we are going to need the system to slow down markedly in order for the anticyclone to have a chance to build over it. The models show this happening, but if we don't get some substantial convective development later today, the low level features might just outrun the more favorable environment and then you can forget about any TCG happening.

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