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December 19th-20 Storm Thread II


Baroclinic Zone

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Since Kev is slacking on his quote duty....

Both the 18Z NAM and GFS has the low development to far east of the hyper-baroclinic field. It is like the ocean will not add sensible heating to the surrounding atmosphere. For this reason and many other I feel a solution more like the ECMWF and Gem may be more correct.

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Here's the match with GFS 12Z at the same time for the prog...

UNCLE

GFS

GFS Trough looks much sharper than the Ukie. Who know what that means....We have to come out of 0Z in a good position. If we get through this run then I'd lock it in....not feeling the lock yet, too much craziness. What an odd year.

I go to NYC on Saturday-Monday when I am scheduled to fly to Florida. Was feeling good about NYC after Euro, but I dunno...If it hits hard I'll make sure we miss the flight to Florida and try to find a way back up here.

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Upton at 7:38...some of you may want to write this down. Ahem.

.LONG TERM /SATURDAY NIGHT THROUGH THURSDAY/...

-- Changed Discussion --

18Z GFS BEING FURTHER OUT TO SEA DOES NOT CHANGE THINKING ON

POTENTIAL STORM. JUST SHOWS UNCERTAINTY REMAINS.

12Z MODELS WERE IN BETTER AGREEMENT ON THE MEDIUM TO LONG RANGE.

FOR NOW HAVE GONE WITH A BLEND OF THE 00Z ECMWF/12Z GFS/12Z CMC

GLOBAL THROUGH MONDAY...THEN REPLACED THE 00Z ECMWF WITH THE 12Z

ECMWF FROM MONDAY NIGHT ON. THE 00Z ECMWF DEVELOPS A WARM CORE AT

850 HPA WITH ITS LOW BY SUNDAY NIGHT...APPARENTLY DUE TO

CONVECTIVE FEEDBACK PROBLEMS...SO ITS LOW IS PROBABLY A TAD ON THE

STRONG SIDE...AND A TAD TOO FAR WEST...IN ADDITION TO ITS

QUESTIONABLE THERMAL FIELDS...SO PREFERRED NOT TO USE IT DURING

THE CORE OF THE POTENTIAL STORM FOR EARLY NEXT WEEK.

THE CONSENSUS SUGGESTS A POTENTIALLY SIGNIFICANT SNOW STORM FROM

LATE SATURDAY NIGHT INTO MONDAY...ESPECIALLY FROM NYC EAST. DO HAVE

SOME CONCERN THAT THE MODELS MIGHT HAVE TRENDED TOO FAR WEST...SO

DO NOT WANT TO PUT THE WESTERN 1/3 OF THE CWA IN THE MAIN THREAT

AREA QUITE YET...THOUGH IF CURRENT TRENDS HOLD...THAT IS STILL A

POSSIBILITY.

IT IS QUITE LIKELY THAT LOW PRESSURE WILL BE DEVELOPING OFF THE

CAROLINA COAST BY SUNDAY MORNING IN RESPONSE TO A 500 HPA TROUGH

DIGGING INTO THE SOUTHERN MID-ATLANTIC STATES...THE ENERGY DRIVING

THIS SHOULD REACH THE PACIFIC NORTHWEST TONIGHT. THIS LOW THEN

TRACKS NEAR THE 40/70 BENCHMARK LATE SUNDAY NIGHT...AND TO AROUND

CAPE COD BY LATE MONDAY.

THE MODELS NOW SUGGEST THAT A WEAK HIGH WILL BE TO THE

NORTH...HELPING TO TAP INTO RE-ENFORCING COLD AIR...WITH A MAINLY

N TO NW WIND FLOW WITH THIS STORM...AS A RESULT...ONCE AGAIN

DISCARDING THE 12Z ECMWF...AM EXPECTING ALL SNOW AT THIS TIME. IF

MIXED PRECIPITATION WERE TO OCCUR THOUGH IT WOULD BE OVER THE TWIN

FORKS AND POSSIBLY SE CT.

IN ADDITION TO THE SNOW...STRONG WINDS ARE LIKELY...FOR NOW

HOLDING TO NEAR OR BELOW ADVISORY STRENGTH...BUT THERE EXACT

STRENGTH IS STILL TO BE DETERMINED.

BASED ON THE ABOVE...WOULD EXPECT SNOW TO DEVELOP FROM S TO N LATE

SATURDAY NIGHT...AND BECOME HEAVY AT TIMES...ESPECIALLY FROM NYC

EAST...SUNDAY AFTERNOON/EVENING...THEN GRADUALLY TAPER OFF MONDAY

FROM SW TO NE. THE HWO WILL BE UPDATED TO REFLECT THIS THINKING.

DEPENDING ON THE EXACT TRACK/STRENGTH OF THE STORM...THERE IS SOME

SUGGESTION THAT THE DEFORMATION AXIS ON THE BACKSIDE OF THE STORM

COULD LINGER OVER THE AREA...WITH LIGHT SNOWS CONTINUING POSSIBLY

INTO TUESDAY. HAVE SLIGHT CHANCE POPS MONDAY NIGHT/TUESDAY TO

REFLECT THIS.

And...:whistle:

THE MODELS THEN SHOW A SECOND STORM...POSSIBLY EVEN

CUTOFF...TRACKING TO THE S IN THE WED-THU TIME FRAME. HAVE CHANCE

POPS FOR SNOW TUE NIGHT-WEDNESDAY TO REFLECT BEST POSSIBILITY WITH

SLIGHT CHANCE POPS WEDNESDAY NIGHT IN CASE SLOWER ECMWF IS CORRECT.

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