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Post Tropical Cyclone Debby


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Any circulation y'all are seeing is just a weaker sub-low in the broad monsoon gyre and not important. This thing is still a mess. I have no idea why the NHC has an 80% chance of formation on this.

Anyways, convection seems to be refiring, except this time it's in the Gulf of Mexico. Probably got a couple days of brewing to go over the GOMEX, the lack of land (Yucatan and western Cuba) will help.

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Any circulation y'all are seeing is just a weaker sub-low in the broad monsoon gyre and not important. This thing is still a mess. I have no idea why the NHC has an 80% chance of formation on this.

Anyways, convection seems to be refiring, except this time it's in the Gulf of Mexico. Probably got a couple days of brewing to go over the GOMEX, the lack of land (Yucatan and western Cuba) will help.

It is sort of cool picking out individual swirls on NOAA IR2 "night visible" loops.

http://www.ssd.noaa.gov/goes/east/gmex/flash-ir2.html

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Turn to the right by the CMC and Ukie...Canadian is a landfall in LA, and Ukie is a landfall near Galveston.

I hate to be beating a dead horse, but the sheer size of this system leads it easy to be picked up by the slightest weakness. Just like Lee last year, once this system reaches a certain latitude it will be hard for the upper level ridge to build completely over the system, especially if it doesn't move very far westward in the short term. I'll go on the record as saying that the 00z GFS solution is not so farfetched. Sure its been suffering from spurious vorticity elements generated through convective feedback issues, but that tiny vortex many have been witnessing on the shortwave IR might just be that spurious vorticity element that will push the mean low center further east.

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Turn to the right by the CMC and Ukie...Canadian is a landfall in LA, and Ukie is a landfall near Galveston.

Until the right turn, Canadian and GFS look a fair amount alike. I'd have to guess where the final main center forms will have a lot to do with whether this is the Florida threat the GFS has been semi-consistent on suggesting, especially with a hint of an Eastern shift in some of the other global guidance.

Oh,

Small differences in initial conditions, huge swing in potential cyclone position.

post-138-0-90597900-1340431198_thumb.gif

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Here is a Early morning update on 96L. At this point I think the track is still largely up in the air, with a split decision for most of the guidence with some models taking it west (the ECMWF camp) whole others take it east (the GFS camp). As always the ultimate track should become much clearer when/if a well defined llc can become established.

http://philstropicalweatherblog.wordpress.com/2012/06/23/invest-96l-getting-better-organized-track-remains-uncertain/

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Here is a Early morning update on 96L. At this point I think the track is still largely up in the air, with a split decision for most of the guidence with some models taking it west (the ECMWF camp) whole others take it east (the GFS camp). As always the ultimate track should become much clearer when/if a well defined llc can become established.

http://philstropical...ains-uncertain/

I usually spit up a little when I see an ULL like that NW of the disturbance. However, I like that SW movement of it as some have noted earlier. They usually are more of a pain since models can be too fast to move them as you said, but that could broaden that outflow channel in a couple of days.

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TROPICAL WEATHER OUTLOOK

NWS NATIONAL HURRICANE CENTER MIAMI FL

800 AM EDT SAT JUN 23 2012

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

THE CENTER OF CIRCULATION OF THE BROAD AREA OF LOW PRESSURE OVER THE

GULF OF MEXICO APPEARS TO BE BECOMING BETTER DEFINED ABOUT 275

MILES SOUTH-SOUTHEAST OF THE MOUTH OF THE MISSISSIPPI RIVER. IN

ADDITION...SHOWERS AND THUNDERSTORMS HAVE BEEN INCREASING OVER THE

EASTERN GULF OF MEXICO...AND A NOAA BUOY LOCATED ABOUT 130 MILES

EAST-NORTHEAST OF THE CENTER HAS PRODUCED TROPICAL-STORM-FORCE

WINDS WITHIN THE PAST COUPLE OF HOURS. A TROPICAL DEPRESSION...OR

MORE LIKELY A TROPICAL STORM...COULD FORM LATER TODAY OR TONIGHT IF

THE DEVELOPMENT TREND CONTINUES. THIS SYSTEM HAS A HIGH CHANCE...

90 PERCENT...OF BECOMING A TROPICAL CYCLONE AS IT MOVES SLOWLY

NORTHWARD DURING THE NEXT 48 HOURS.

TROPICAL STORM WATCHES OR WARNINGS COULD BE REQUIRED FOR A PORTION

OF THE NORTHERN GULF COAST OVER THE WEEKEND...AND INTERESTS IN THIS

AREA SHOULD CONTINUE TO MONITOR THE PROGRESS OF THIS LOW. HEAVY

RAINS AND LOCALIZED FLOODING ARE POSSIBLE ACROSS THE YUCATAN

PENINSULA...WESTERN CUBA...AND MUCH OF FLORIDA OVER THE NEXT DAY OR

SO. AN AIR FORCE RESERVE RECONNAISSANCE AIRCRAFT IS SCHEDULED TO

INVESTIGATE THE SYSTEM THIS AFTERNOON.

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

NEXT 48 HOURS.

$$

FORECASTER BERG

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Nothing but a big ole sheared early season Gulf storm with an elongated broad low...

1998 Earl at peak (Category 2) Intensity (earlier pics are from when it was classified as a hurricane, IIRC). I remember wondering whether LSD had made it into the WC-130 cabin air systems at the time. The strongest wind speeds I've ever seen with actual center relocations (or no center at all).

600px-Hurricane_Earl_02_sept_1998_2028Z.jpg

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HPC:

UPDATED PRELIM...

THE 06Z GFS ADJUSTED SLIGHTLY SLOWER THAN ITS 00Z RUN WITH

EJECTING AN INITIAL PIECE OF ENERGY ACROSS THE PACIFIC NORTHWEST

DAYS 3-4...BUT IT REMAINS A FAST OUTLIER WITH CARRYING THE CLOSED

ENERGY EASTWARD ACROSS SOUTHERN CANADA DAYS 4-6 WHEN COMPARED TO

THE 00Z ECMWF/CMC/UKMET/ECMWF ENSEMBLE MEAN.

CONCERNING THE DEVELOPING AREA OF LOW PRESSURE OVER THE GULF OF

MEXICO...THE GFS HAS BEEN CONSISTENT WITH ITS NORTHEASTWARD

TRACK...AND ITS 06Z RUN WAS EVEN QUICKER TO BRING THE LOW ACROSS

CENTRAL FLORIDA AND OUT INTO THE ATLANTIC. HOWEVER...MODEL

CONSENSUS...INCLUDING THE 00Z GEFS MEAN...CONTINUES TO FAVOR IDEA

OF THE LOW PRESSURE STRENGTHENING OVER THE CENTRAL GULF AND THEN

MOVING WESTWARD TOWARDS SOUTH TEXAS.

DESPITE THE AGREEMENT AMONG DETERMINISTIC MODELS AND ENSEMBLE

MEANS...INDIVIDUAL ENSEMBLE MEMBERS OF THE GEFS/ECMWF/CMC STILL

INDICATE A LARGE AMOUNT OF SPREAD WITH THE FLATTENING OF FLOW OVER

THE NORTHERN CONUS LATE IN THE FORECAST PERIOD AND WITH THE

DEVELOPING AREA OF LOW PRESSURE IN THE GULF. FOR NOW...THE

FORECAST RELIES ON THE CONSISTENCY OF THE ECMWF/ECMWF ENSEMBLE

MEAN. THIS SOLUTION BEST REPRESENTS MODEL CONSENSUS...BUT GIVEN

THE LARGE AMOUNT OF ENSEMBLE SPREAD AFTER DAY 4...MORE WEIGHT WAS

GIVEN TOWARDS THE ECMWF MEAN LATE IN THE FORECAST PERIOD. THIS

REMAINS A LOW CONFIDENCES FORECAST...ESPECIALLY AFTER DAY 4.

MAJOR CHANGES IN THE GULF WILL NOT BE MADE UNTIL AFTER THE 17Z

NHC/HPC COORDINATION CALL.

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