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2/19 Weekend Threat


am19psu

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I'd post my updated snowfall forecast, but when the forecast is for 0" region-wide it doesn't really matter :P Sorry, folks. Hopefully this does trend back north, but it's definitely looking to stay south at this point.

Any news on the 12z euro ensembles? I really think that this 12z run will be on the southern area of the ensemble mean. How can this not come north with such a marginal airmass? You know more than I do, it has something to do with the vortex over the NE hmm?

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Any news on the 12z euro ensembles? I really think that this 12z run will be on the southern area of the ensemble mean. How can this not come north with such a marginal airmass? You know more than I do, it has something to do with the vortex over the NE hmm?

Euro ensembles don't come out for about another hour or so EDIT: A little sooner than I thought... it has just started. The problem with bringing the storm back north is the upper-level energy just isn't that strong and is fairly strung out... unless some consolidation of the energy takes place (kind of like what the 12z NAM has), I can't really buy into this thing jogging north.

***********troll post warning has been issued**********

Ha! I TRIED to give you guys some lovin! Maybe next time I can excite you some with the 4-8" SNOW PEEN contour.

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Any news on the 12z euro ensembles? I really think that this 12z run will be on the southern area of the ensemble mean. How can this not come north with such a marginal airmass? You know more than I do, it has something to do with the vortex over the NE hmm?

It really has nothing to do with the airmass and everything to do with massively confluent flow progged to be over us. You need a ton of latent heat release to overcome that, and with the southern stream trending weaker, it's no surprise that the model solutions have trended farther south.

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Interesting read.

MODEL DIAGNOSTIC DISCUSSION

NWS HYDROMETEOROLOGICAL PREDICTION CENTER CAMP SPRINGS MD

154 PM EST FRI FEB 17 2012

...LOW PRESSURE MOVING FROM TEXAS TO THE MID-ATLANTIC REGION...

PREFERENCE: DETERMINISTIC CONSENSUS BEST REPRESENTED BY THE GFS

THE NEW ECMWF HAS TRENDED SLOWER AND FARTHER SOUTH WITH ITS LATEST

PMSL DEPICTIONS WHICH PLACES ITS SOLUTION WITHIN THE SOUTHWESTERN

CAMP OF LOW TRACK SOLUTIONS THAT INCLUDES THE CANADIAN...WHILE THE

NAM LIES WITHIN THE FAST CAMP...AND THE GFS/UKMET NEAR THE

MIDDLE...WITH TIMING DIFFERENCES SPANNING ABOUT 6 HOURS AND

SPATIAL DIFFERENCES ABOUT 75-100 NM. IF THE GLOBAL ENSEMBLE

MEMBERS ARE INCLUDED...DIFFERENCES INCREASE BY 2 TO 3 TIMES AS

LARGE. AS A WHOLE HOWEVER...THE MAJORITY OF SOLUTIONS CLUSTER

NEATLY AROUND THE GFS/UKMET...INCLUDING THE LATEST GFS/ECMWF

ENSEMBLE MEANS. THUS...CONFIDENCE IS DEPICTING THE LOW'S TRACK HAS

INCREASED.

HOWEVER...MUCH UNCERTAINTY REMAINS...INCLUDING THE

INITIALIZATION/BEHAVIOR/EVOLUTION OF SEVERAL SMALL-SCALE SHORTWAVE

TROUGHS ACROSS THE NORTHERN PORTIONS OF THE CONUS AND SOUTHERN

CANADA...WHICH WILL HAVE A DIRECT BEARING ON THE PRECISE

TRACK/DEPTH OF THE LOW. ADDITIONALLY...MUCH IS UNCLEAR ABOUT THE

ANTICIPATED QPF AND INFLUENCE FROM CONVECTIVE PROCESSES AND

ACCOMPANYING NORTHWARD MOISTURE FLUX FROM THE GULF OF MEXICO. IN

SUMMARY...THE ACCOMPANYING SPLIT-FLOW REGIME APPEARS TO HAVE

LIMITED PREDICTABILITY

...AND AS SUCH...A DETERMINISTIC CONSENSUS THAT MAXIMIZES THE USE

OF HIGHER SPATIAL RESOLUTION WHILE PROVIDING MULTIPLE DYNAMICAL

CORES/MODEL PHYSICS PACKAGES TO INCREASE THE DISPERSION...SEEMS

MOST PRUDENT. THIS APPROACH IS BEST APPROXIMATED BY THE 12Z

GFS...AND IS SUPPORTED BY THE GFS/ECMWF ENSEMBLE MEANS...ALBEIT

WITH LESS DEFINITION. REFER TO THE QPFPFD AND QPFHSD FOR MORE

INFORMATION ON QPF AND WINTER WEATHER PREFERENCES.

CONFIDENCE: ABOVE AVERAGE ON TRACK...BUT BELOW AVERAGE ON TIMING

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