Post Tropical Cyclone Debby. Exiting E Over The Atlantic

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srainhoutx
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Belmer wrote:This page is looking depressing with hardly anybody online for what could be Debby this weekend and what could head to Texas by early to mid next week. If models continue the westerly movement, I hope this forum shows a little bit more life by tomorrow... :|

I suspect things will perk up once the word gets out and we see more model agreement. No doubt the night crew will become more active and with our knowledgeable Pros chiming in, the board will begin to pop should conditions trend toward a bonafide Texas/Louisiana threat. NWS Houston/Galveston said it perfectly in their afternoon Marine Forecast:

MARINE...
TIDE LEVELS ARE CURRENTLY RUNNING 1-1.5 FEET ABOVE NORMAL AND WILL
NEED TO BE MONITORED FOR THE NEXT SEVERAL DAYS AND INTO NEXT
WEEK. FAIRLY LONG FETCH OF MODERATE ENE WINDS ACROSS THE NRN GULF
WHICH IS THE CULPRIT. NOT EXPECTING MANY SIGNIFICANT CHANGES THE
NEXT COUPLE DAYS THAT WOULD CAUSE MAJOR CHANGES TO THE LEVELS.
ASTRONOMICAL HIGH TIDES ALONG THE BEACHES SHOULD BE RUNNING
1.8-2.0 FEET. SO WE`LL BE JUST BELOW THE TOTAL 3.7 FEET CRITERIA
(ASTRONOMICAL + METEOROLOGICAL) WHEN WE TYPICALLY SEE SOME MINOR
COASTAL FLOOD ISSUES AT THE LOWEST LOCATIONS.

OF COURSE THIS WILL ALSO TIE INTO WHAT EVENTUALLY EVOLVES IN THE
GULF REGARDING POTENTIAL DEVELOPMENT IN THE MESS NEAR THE
YUCATAN. SEVERAL...SEVERAL DIFFERING MODEL SOLNS AND ANALYSIS IN
PLAY AND REALLY NOT WORTH FLIP-FLOPPING THE FCST EVERY 6 HOURS
WITH EACH MODEL RUN FOR SOMETHING THAT DOESN`T HAVE A CLOSED
CIRCULATION YET.
THAT BEING SAID THERE ARE ENOUGH MODEL SOLNS THAT
DO KEEP THE SYSTEM OVER THE GULF LONGER (AND SOME FURTHER WEST) TO
WARRANT NUDGING SEAS UP DURING THE EXTENDED PORTION OF THE FCST.

NEEDLESS TO SAY... MARINERS SHOULD EXPECT SEVERAL CHANGES IN THE
FCST BETWEEN NOW AND MID-LATE NEXT WEEK.
Carla/Alicia/Jerry(In The Eye)/Michelle/Charley/Ivan/Dennis/Katrina/Rita/Wilma/Humberto/Ike/Harvey

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Katdaddy
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Time to really begin watching the GOM now that we have an official Invest and LLC over the extreme N Yucatan with a ton of moisture to the NE and E across the SE GOM and NW Caribbean Sea.
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TS in the Gulf...Of course it was bound to happen...Leaving tomorrow for a week in Galveston...
Put the wet stuff on the red stuff!
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srainhoutx
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96L remains unorganized this evening near sunset. A broad surface low is currently onshore across the Northern Yucatan Peninsula. A trough axis extends E toward Cuba and the Florida Keys. Upper level wind shear is still rather strong as well.
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06212012 23Z Gulf VIS latest.jpg
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srainhoutx
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TROPICAL WEATHER OUTLOOK
NWS NATIONAL HURRICANE CENTER MIAMI FL
800 PM EDT THU JUN 21 2012

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

THE NATIONAL HURRICANE CENTER IS ISSUING ADVISORIES ON RECENTLY
DOWNGRADED TROPICAL STORM CHRIS...LOCATED ABOUT 585 MILES
EAST-SOUTHEAST OF CAPE RACE NEWFOUNDLAND.

A LARGE LOW PRESSURE SYSTEM LOCATED JUST NORTH OF THE NORTHERN COAST
OF THE YUCATAN PENINSULA IS PRODUCING AN EXTENSIVE AREA OF
CLOUDINESS...SHOWERS AND SCATTERED THUNDERSTORMS OVER MUCH OF THE
CENTRAL AND EASTERN GULF OF MEXICO AND THE NORTHWESTERN CARIBBEAN
SEA...AND ALSO OVER THE YUCATAN PENINSULA...WESTERN AND CENTRAL
CUBA...SOUTHERN FLORIDA...AND THE NORTHWESTERN BAHAMAS. SATELLITE
DATA AND SURFACE OBSERVATIONS INDICATE THAT THE LOW PRESSURE SYSTEM
IS GRADUALLY BECOMING BETTER DEFINED AND SURFACE PRESSURES ARE
SLOWLY FALLING ACROSS THE AREA. UPPER-LEVEL WINDS ARE ALSO
IMPROVING AND ARE FORECAST TO BECOME MORE CONDUCIVE FOR DEVELOPMENT
OF A TROPICAL DEPRESSION DURING THE NEXT DAY OR SO. THIS SYSTEM HAS
A HIGH CHANCE...70 PERCENT...OF BECOMING A TROPICAL CYCLONE DURING
THE NEXT 48 HOURS AS IT MOVES SLOWLY NORTHWARD INTO THE CENTRAL
GULF OF MEXICO. INTERESTS ALONG THE ENTIRE UNITED STATES GULF COAST
SHOULD MONITOR THE PROGRESS OF THIS LARGE DISTURBANCE THROUGH THE
WEEKEND. HEAVY RAINS AND LOCALIZED FLOODING ARE POSSIBLE ACROSS THE
YUCATAN PENINSULA...WESTERN CUBA...AND SOUTHERN FLORIDA THROUGH
SATURDAY. AN AIR FORCE RESERVE RECONNAISSANCE AIRCRAFT IS SCHEDULED
TO INVESTIGATE THE SYSTEM TOMORROW AFTERNOON...IF NECESSARY.

ELSEWHERE...TROPICAL CYCLONE FORMATION IS NOT EXPECTED DURING THE
NEXT 48 HOURS.

$$
FORECASTER STEWART
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06212012 7 PM CDT two_atl.gif
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The attachment 06222012 TAFB NHC 0000Z _a.png is no longer available
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06222012_0015_goes13_x_ir1km_96LINVEST_20kts-1007mb-220N-890W_100pc.jpg
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Gene Norman

Ok, so if we get Debby, that makes 4 named storms in the first month. I've been checking records and the only year I see where anything like this happened was 1968, when three storms formed in June. This "average season" is off to a quick start. Anyone else know of another year as active as early?
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It’s only the third time that three storms have formed before June 19. The other two occasions were the 1887 and 1959 hurricane seasons.
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Very broad surface circulation has finally developed over the southern Gulf being born out of the monsoon trough. Circulation is very broad and I do not expect to see anything change quick as it is going to take time to consolidate.

As for the models...well the EURO and CMC have swung back to the W Gulf and the GFS remains aimed at FL. EURO and CMC ensembles also support the W Gulf while the GFS ensembles are pretty split between the tow camps. Nothing has really changed in the model world over the past 24 hours as they continue their wild swings between runs and models. Only difference is that we do now have a very broad circulation to fix into the models and after the plane flies tomorrow that should help. I am starting to like the more western solution better as I do not see this system gaining intensity quick and the trough then passing it by to the NE and the system then comes under the influence of the southern plains high as it builds eastward. The weak steering currents which will be in play also support a track more toward the west giving the system time to be left behind by the trough.

Regardless, tides are already elevated and with winds backing even more to the E/ENE this weekend, that will help keep tides elevated through the weekend. By early next week, we should start to see increased swells and that will pile even more water onto the coast, with tides possibly reaching minor flooding levels by that point. Should 96L advance toward the W/NW Gulf then even higher tides can be expected and for a prolonged period of time due to the slow motion.
Gene Norman

Ok, so then four named storms before July 1 would be a record, beating 1887, 1959 and 1968!
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On top of that...does anyone know if Chris was a record for the furthest north hurricane this early in the season? Two June storms in any given year is very rare as the average is a June named system every other year.
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Belmer wrote:This page is looking depressing with hardly anybody online for what could be Debby this weekend and what could head to Texas by early to mid next week. If models continue the westerly movement, I hope this forum shows a little bit more life by tomorrow... :|
It's a slow process and a lot of model uncertainty. I'm monitoring it closely but frankly it's not much different than last night, or even the night before. Once the center tightens up and the models lock, we get to the brass tax and there will be more substance to discuss. For now, it's still a guessing-game...
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Even better since 1950-2012:

The mean number of named storms for June 19th is .56 with 2012 ahead of the mean by 2.44 or just inside the 3 standard deviations.

In the last 60 years the mean date of the first named storm was August 11. The 2012 season is ahead of the mean by 53 days.
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Gene Norman wrote:Ok, so then four named storms before July 1 would be a record, beating 1887, 1959 and 1968!
Total Number Of Storms Including Accumulated Cyclone Energy (ACE) and ACE/Storm
1887 19/11/2 182 9.6
1959 11/7/2 77 7.0
1968 8/4/0 35 4.4

Average
13/7/1

Median
11/7/2

ACE Average
98

ACE Median
77

ACE/Storm Average
7

ACE/Storm Median
7

Two of the season saw a Texas landfall.
1959-Hurricane Debra
1968-Tropical Storm Candy

At this point, we could see a landfall this season.

I think 1887 had more major hurricanes.
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jeff wrote:On top of that...does anyone know if Chris was a record for the furthest north hurricane this early in the season? Two June storms in any given year is very rare as the average is a June named system every other year.
Chris is the second northern most hurricane to form since Tropical Storm Alberto in 1988. Chris looks to be the northernmost hurricane to form early in the season.

It is very possible tropical storms have formed further north and in June, but this is before satellites existed.
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ECMWF isn't out but other tropical models suggest that the flip-flopping continues...

Tried to attach an image, but I guess the file was too big, here's the URL...

http://derecho.math.uwm.edu/models/al962012.png
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Belmer
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Tim Heller just posted this on facebook:

"New GFS data no longer showing Florida landfall. GFS now indicating storm could stall over the Gulf and drift westward next week. This is going to be a loooong weekend."

I am so happy to hear that :D
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The 00Z Canadian suggests a SW Louisiana/SE Texas threat again during the middle of next week.
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The 00Z Ukmet is S of Vermillion Bay by hour 72.
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Belmer
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I really need to get some shut eye since I have to wake up so early tomorrow morning, but I would like to see the European model before that. C'mon European!!! Show yourself :D

Plus, I don't think I'll be getting very much sleep here soon... ;)
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