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Atlantic Tropical Action 2012 - Part I


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ENSO is becoming more of a neutral factor, but relative SSTAs still suck

Meh. So we'll just have to deal with home grown quick spin ups and be spared from endless days of watching some phantom model porn long tracker that never develops.

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ENSO is becoming more of a neutral factor, but relative SSTAs still suck

They are ok, especially W of 40W. SHAs still show that we are in a distinct +AMO/+TNA regime, there's a plus in OHC out there, surface SSTs were just negatively affected by the +NAO regime in winter and early spring. Since then it has been more of a neutral NAO one, and the time we got a brief -NAO period, a few weeks ago, SSTAs responded quickly. May will probably average ~0 in the TNA index, and 10 days from now we'll probably see very distinct +SSTAs in the MDR. Right now I would consider SSTAs as neutral with a positive outlook.

2012142atsha.png

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Meh. So we'll just have to deal with home grown quick spin ups and be spared from endless days of watching some phantom model porn long tracker that never develops.

Back when I still had dial-up, 2003, I'd download loops (which didn't happen very fast at 56k) of Isabel when it was way, way, way out at sea and beautiful. Even my then toddler son was fascinated. We'd stare together.

Anyway, just a feeling of a near normal season. The quick spinners, well, all I can say, Edouard in 2008- the two models on it first, NAM and CMC. That was awesome.

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Also keep in mind that we have a descending easterly QBO, with overall strong easterly shear in the stratosphere along the equator. Coinciding with this shear is anomalous warm stratosphere off the equator (~10N/S) ... lowering the tropopause height and suppressing convection. This effect should weaken through the season as the easterlies weaken and the westerly QBO is already becoming apparent down to around 8mb. But something to consider for the first half at least

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Both the GFS and ECMWF are certainly on board for a subtropical/tropical event... looks substantially larger than Alberto as well. Should be fun to watch this weekend!

As are the UKMET and CMC. Also note that all these models bring this onshore the SE coast (between central FL and southern SC) in 4-5 days. The 00z global model suite is in tight agreement on both the track and intensity through that timeframe. Seems the biggest question revolves around the nature of the low (tropical? subtropical? un-nameworthy hybrid?)

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SPECIAL TROPICAL WEATHER OUTLOOK

NWS NATIONAL HURRICANE CENTER MIAMI FL

840 AM EDT THU MAY 24 2012

FOR THE NORTH ATLANTIC...CARIBBEAN SEA AND THE GULF OF MEXICO...

AN ELONGATED AREA OF LOW PRESSURE EXTENDING FROM THE NORTHWESTERN

CARIBBEAN SEA ACROSS WESTERN CUBA AND INTO THE FLORIDA STRAITS IS

ASSOCIATED WITH A LARGE AREA OF DISORGANIZED SHOWER AND

THUNDERSTORM ACTIVITY. CURRENTLY THE SYSTEM LACKS A WELL-DEFINED

CIRCULATION CENTER...AND ENVIRONMENTAL CONDITIONS ARE NOT EXPECTED

TO BE CONDUCIVE FOR SIGNIFICANT DEVELOPMENT OF THIS SYSTEM DURING

THE NEXT DAY OR SO. THIS SYSTEM HAS A LOW CHANCE...20 PERCENT...OF

BECOMING A TROPICAL OR SUBTROPICAL CYCLONE DURING THE NEXT 48 HOURS

AS IT MOVES NORTHEASTWARD ACROSS THE BAHAMAS AND INTO THE

SOUTHWESTERN ATLANTIC OCEAN.

ALTHOUGH CONDITIONS ARE NOT CURRENTLY FAVORABLE FOR DEVELOPMENT...

THEY ARE EXPECTED TO BECOME MORE CONDUCIVE FOR THE FORMATION OF A

SUBTROPICAL OR TROPICAL CYCLONE BY LATE SATURDAY OR SUNDAY.

REGARDLESS OF ANY DEVELOPMENT...LOCALLY HEAVY RAINFALL AND FLOODING

ARE POSSIBLE OVER THE CAYMAN ISLANDS...PORTIONS OF CUBA...SOUTHERN

FLORIDA...AND THE BAHAMAS. ANOTHER SPECIAL TROPICAL WEATHER OUTLOOK

FOR THIS SYSTEM WILL BE ISSUED ON FRIDAY. FOR ADDITIONAL

INFORMATION ON THIS SYSTEM...PLEASE SEE HIGH SEAS FORECASTS ISSUED

BY THE NATIONAL WEATHER SERVICE...AND PRODUCTS FROM YOUR LOCAL

WEATHER OFFICE.

ELSEWHERE...TROPICAL CYCLONE FORMATION IS NOT EXPECTED DURING THE

NEXT 48 HOURS.

&&

HIGH SEAS FORECASTS ISSUED BY THE NATIONAL WEATHER SERVICE CAN BE

FOUND UNDER AWIPS HEADER NFDHSFAT1 AND WMO HEADER FZNT01 KWBC.

$$

FORECASTER BRENNAN/BERG

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Excellent TWO by the NHC. Really covered a good deal of the situation.

Most of the global models develop this by the weekend.

Would really be something to have two pre-season storms in a season that is forecast to be "near average"

Also thegreatdr had an informative discussion yesterday afternoon as well. Some forget to check out the HPC forecasts when talking about tropical/non tropical systems... ;)

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Excellent TWO by the NHC. Really covered a good deal of the situation.

Most of the global models develop this by the weekend.

Would really be something to have two pre-season storms in a season that is forecast to be "near average"

It will be interesting to see if this year has some other similarities to the 2007 season with the early

STS Andrea and TS Barry. The hallmark of that season was many weak and short-lived systems

punctuated by Dean and Felix. That was certainly one of the more unusual years in recent

memory.

http://weather.unisy...2007H/index.php

http://www.weather.c...permalink_month

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It will be interesting to see if this year has some other similarities to the 2007 season with the early

STS Andrea and TS Barry. The hallmark of that season was many weak and short-lived systems

punctuated by Dean and Felix. That was certainly one of the more unusual years in recent

memory.

http://weather.unisy...2007H/index.php

http://www.weather.c...permalink_month

I remember a lot of people freaking out towards the end of August 2007 that seasonal predictions were going to be an epic fail and that the biggest storm had already happened.

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