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Winter 2011-2012 Kickoff Thread | December 2011


earthlight

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euro damn! harsh run for the christmas area storm.

The bolded adjective does not tell me much....does it bring snow into the area?

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He probably meant that it's a torch for us or the storm gets suppressed.

Temperatures are in the 30s inland 40s along the coast with a low pressure off the coast around 204 hrs which is a coastal hugger. By 210 temperatures start to crash towards the coast...But by 216 it is out of here..

Its a decent threat to track at least at this point and time as well as the one HM alluded to.

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Temperatures are in the 30s inland 40s along the coast with a low pressure off the coast around 204 hrs which is a coastal hugger. By 210 temperatures start to crash towards the coast...But by 216 it is out of here..

Its a decent threat to track at least at this point and time as well as the one HM alluded to.

People are really worried about details 200+ out? Lol, at least there is something to track.

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NAM keeps everyone, including the coast, below 32 as the high and lows in the low 20's.

Another example of an over performing northerly flow cold event for us here.

Even without decent snow cover to the north, we were able to blow out the MOS

for the coldest readings of the month so far.

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The 12/22-23 system has a good orientation with the upstream high pressure / cold air in place along with the baroclinic zone along the coast. If this southern s/w doesn't shear out like the models are currently suggesting, this will become a coastal storm with accumulating snow. My worry with the system on the 26th will be the fast speed, lack of upstream high pressure and cold air that can easily erode should the track of the system call for it. A lot would have to come together just right with a system like that (same ordeal happened with 12/7).

Often the southern branch s/w is stronger than modeled. So I agree it's something to watch for 22/23. But if that southern branch is stronger, it could also kick up the heights along east coast and keep the cold front from reaching us, until it's too late.

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The Ensemble mean has tomorrow as the coldest day out of the next 10 days.

The low Sunday am has a shot of being the coldest for the month of December when all said and done.

If anyone want's to do an over or under, I'll guess that 23 degrees stands as the low for the whole month of December in NYC.

http://www.wunderground.com/history/airport/KNYC/2011/12/18/DailyHistory.html?req_city=NA&req_state=NA&req_statename=NA

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FWIW, hour 192 of the 12z GFS looks more interesting. Not sure if it's rain to snow or just rain, but at least there's something showing up there.

post-1753-0-83663800-1324226236.gif

That particular frame of the GFS actually looks very similar to December 5th 2009 event where parts of NW NJ got several inches of snow in a rain to snow changeover event that took place throughout that Saturday day in all of NJ from NW to SE. It was a weak system that had a plume of moisture that is similar to this particular plume of moisture, and the area of low pressure was weak, just like what the GFS depicts for that storm.

(NOTE: The GGEM map below is for the December 5th 2009 storm, NOT for the storm to impact the area around Christmas time).

qoy3aq.jpg

The precursor to that storm also brought record setting snow in parts of Texas, and Louisianna.

120409snowmap.gif

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100% agreed. GFS literally changes it entire run ever 6 hours. These models are just hilarious and pitiful this year.

The real problem has been the handling of the split streams for exact positions of the lows. But the models have

ultimately settled on warm solutions with the big +AO pattern.

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easy forecasts for the next few weeks (month?)

whatever amplifies will rain on us due to zero blocking and the SE ridge

there's plenty of cold air in Canada now, so behind the storm systems we should still see some cold air which should beat down the positive departures a bit. It's a shame it will all be shunted away any time it precipitates.

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Upton's take on the upcoming patter

THE NEXT WAVE COMES ABOUT LATE THURSDAY EVENING INTO FRIDAY MORNING.

FEEL RATHER CONFIDENT IN THIS SYSTEM BASED ON
SUPPORT...BUT

FOR NOW HAVE HELD
TO 50% BASED ON COLLABORATION FROM

SURROUNDING OFFICES. TEMPS ARE MARGINAL AT BEST...BUT INLAND AREAS

DO LOOK LIKE A P-TYPE OF MAINLY SN. SNOW AMOUNTS OF AROUND 2 INCHES

ARE SUPPORTED (INLAND)...THOUGH TEMPS MAY SUPPORT MORE OF A

GRASSY...SECONDARY ROAD TYPE OF ACCUMULATION.

MAJOR UNCERTAINTY ARISES OVER THE WEEKEND WITH A PLETHORA OF

SOLUTIONS. THE GEFS DOES NOT SUPPORT THE 12Z
OPERATIONAL

RUN...BUT ALSO DOES NOT TRULY SUPPORT THE 12Z
EITHER. THE CMC

IS DRY. THE GEFS SEEMS TO BE LEANING MORE TOWARDS A SUNDAY INTO

EARLY MONDAY EVENT. THUS FOR NOW...HAVE GONE WITH THE LOW

SATURDAY
INTO MONDAY WITH 40
CENTERED FOR SUNDAY. P TYPE IS

MAINLY LIQUID FOR THE COAST...BUT MAINLY SNOW NW...THOUGH WITH THE

HIGH UNCERTAINTY...HAVE NO CONFIDENCE FOR ANY POSSIBLE WINTER

WEATHER
AT THIS TIME.

-- End Changed Discussion --

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