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The return of winter pattern disco


Damage In Tolland

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NWS Tauton AFD... AWT

FRI/SAT...NEW 12Z MODEL GUIDANCE CONTINUES THE THEME OF A POTENTIAL STRONGCOASTAL STORM ESPECIALLY THE 12Z UKMET AND 12Z GFS. THE 12Z GEFS ISFAIRLY STRONG ESPECIALLY GIVEN THE LOW RESOLUTION OF THE ENSEMBLES.HOWEVER THIS SET OF GUIDANCE DELAYS SIGNIFICANT INTENSIFICATION TOJUST NORTH OF OUR LATITUDE SUGGESTING MORE OF AN IMPACT TO NORTHERNNEW ENGLAND. THE 12Z ECMWF ALSO DELAYS INTENSIFICATION UNTIL FARTHEROFFSHORE BUT DOES GENERATE MODEST QPF ACROSS RI AND SOUTHEAST MAWITH 0.50 TO 0.8 INCHES OF LIQUID QPF...WITH LESS NORTHWARD. HPCINFORMS US THAT THE NEW 12Z ECMWF ENSEMBLE MEAN IS FARTHER EAST THANTHE 12Z OP ECMWF. HOWEVER AS WE HAVE SEEN FROM PAST EVENTS A MOREAMPLIFIED AND CLOSER SOLUTION SEEN IN DAYS 6-7 COMES BACK IN DAYS 2-3.
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If that's the analog, shouldn't we cringe at such a mention? Asking because I'm not sure what role the analogs play in forecasting.

Yes I don't understand it.....but I haven't looked at H5 either and maybe I'm picking the wrong event? But the Cleveland bomb was the awful rainer.

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Good news for GC. ALY chucks a couple.

AT THIS TIME...SEEMS THE REGION IS POISED FOR A PROLONGED SNOW EVENT

AS A DEFORMATION/TROWAL AXIS WILL BE IN THE VICINITY. IN

ADDITION...TIMING AND STRENGTH OF THE SHORT WAVE COULD ALLOW FOR

THIS TROUGH TO BECOME NEGATIVELY TILTED WITH A DEEPENING SURFACE

COASTAL LOW NEAR NEW ENGLAND. 500MB ENSEMBLES FROM THE GFS SHOW A

RATHER HIGH CONFIDENCE THAT THIS UPPER LOW WILL BE OVER THE EASTERN

GREAT LAKES. HOWEVER...THE SAME CAN NOT BE SAID FOR ITS SURFACE

REFLECTION WITH A RATHER LARGE SPREAD IN THE TRACKS AND INTENSITY

/HIGH STANDARD DEVIATIONS/. SO THE TIME FRAME OF INTEREST WILL

BE BETWEEN FRIDAY AND SATURDAY /MAYBE AS EARLY AS THURSDAY NIGHT/.

GIVEN THE TRENDS FROM THE PAST SEVERAL DAYS OF ANOTHER ACCUMULATING

SNOWFALL EVENT...WE WILL HIGHLIGHT THE POTENTIAL FOR SNOW IN THE HWO

AT THIS TIME.

25.9/12

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weenie jackpot.

when talking about a storm stalling i recall Wx4cast posting usually a day or so before the event regarding needing some feature to be 2.5 Standard deviations or more ......to show a very good potential. does anyone recall this ........

I recall.....I think it was -2.0 to slow and the threshold for stall was less (more extreme) than -2.5 SD, but I forget what it was the SD of. lol

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