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December 10th/11th winter storm threat


jamesnichols1989

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This setup reminds me of 12/24/98...though maybe its slightly further NW.

 

It is the #5 analog on CIPS for the 24 hour panel....overall though none of the analogs are all that good, only one scoring over 13.0 and I find that usually does not work too well....1-1-86 is the best analog by alot and that date does not stand out in my mind.

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Will do you remember the February 24-25th 1999 event?  

 

Anyways GFS has a 12 hour event, while NAM has 9 hour event, which one to believe?  GFS is more amplified at H5 too.  12z GGEM isn't bad at all.

 

 

Yes....this is nothing like that event at all. Much closer to something like 12/24/98, though I'm hesitant to say we get amounts in the max zone like that one. This one could still end up too sheared.

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BOX this AM talking about a lot of the same points as in here.

 

DETAILS...

TUE...MODERATE CONFIDENCE.
WILL BE MONITORING FOR A PERIOD OF SNOW PARTICULARLY S OF THE
MASS PIKE FROM ABOUT MID MORNING INTO THE AFTERNOON HOURS AS A
WEAK SFC FRONTAL WAVE INITIATES SOME MODEST MID LVL F-GEN BANDING
TO ITS N. WHILE THE EXACT PLACEMENT OF THIS BAND IS A LITTLE
UNCERTAIN...HAVE AT LEAST ENOUGH CONFIDENCE TO ERR TOWARD HIGH
CHANCE-LOW LIKELY POPS FOR THIS POTENTIAL. INTERESTINGLY...THE
LIFT PROVIDED BY THE F-GEN BAND IS LOCATED ALMOST PERFECTLY IN THE
-10C TO -20C LAYER WHICH IS ICE-SATURATED
...SOMETHING THIS
MORNING/S STORM WAS LACKING. GIVEN THAT THIS WAVE LOOKS TO HAVE
GULF ORIGINS...QPF VALUES WITHIN THE BAND RANGE FROM 0.1-0.4
INCHES
DEPENDING ON ITS TRACK. RATIOS MAY BE A BIT HIGHER DUE TO
WEAKER WINDS AND BETTER SNOW GROWTH EFFICIENCY COULD YIELD NEAR
ADVISORY LEVEL SNOWFALL FOR SOME AREAS IN CT/RI/SE MA...BUT THERE
IS ALSO A FAIR AMOUNT OF NEAR SFC DRY AIR TO OVERCOME. NOT
CONFIDENT IN THE BAND SETUP TO PULL THE TRIGGER...BUT SOMETHING
WORTH WATCHING. FURTHER N...MAY BE A SHARP CUTOFF ACROSS NRN MA
AND SRN NH WHERE LITTLE TO NO SNOW MAY BE OBSERVED. TEMPS MAY ALSO
BE AN ISSUE AS SOME MAY JUST INCH ABOVE FREEZING AS SNOWS TAPER
OFF...SO HAVE TO WATCH OUT FOR DYNAMIC COOLING WHICH COULD PROMOTE
SNOW ACCUM DESPITE TEMPS WARMING TO THE MID 30S.

 

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I hope you win this... but what is supporting 8-10" anywhere?

 

I don't think the model suite as a whole supports those numbers, but if the GFS is correct in showing .5-.6 QPF on Long Island through central CT, it's not much of a stretch to think some spots could see 8" with good snow growth. The GFS is currently on its own with those QPF numbers, though, so I'm not ready to take it at face value. 

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12-24-1998 links for reference:

 

NWS Taunton PNS

http://www.erh.noaa.gov/box/climate/snowrpts/DE259801

 

Storm summary (a bit NJ focused, but very useful):

http://www.raymondcmartinjr.com/weather/1999/24-Dec-98.html

 

Totally off topic, but that 13 December 1988 snow is one of my favorites of all time.  It was completely unforecast.  

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12z GGEM looks to bring the best stuff right along the S Coast.

 

The RGEM is somewhat similar, the RGEM was the only model last even to perfectly get the PHL meso band placed, of course it did not do that til its 12Z run te day of but it did a decent job on the event as a whole 24 hours out and its timing has been very good, both the RGEM/GEM seem to start this earlier from DCA-BOS and end it earlier

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12-24-1998 links for reference:

NWS Taunton PNS

http://www.erh.noaa.gov/box/climate/snowrpts/DE259801

Storm summary (a bit NJ focused, but very useful):

http://www.raymondcmartinjr.com/weather/1999/24-Dec-98.html

Totally off topic, but that 13 December 1988 snow is one of my favorites of all time. It was completely unforecast.

Mine too. I remember it so well. I was taking drivers ed and had class that nite and it was my first time driving in the snow. The instructor was shocked at the snow and cut short the lesson. It was ripping that evening
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The RGEM is somewhat similar, the RGEM was the only model last even to perfectly get the PHL meso band placed, of course it did not do that til its 12Z run te day of but it did a decent job on the event as a whole 24 hours out and its timing has been very good, both the RGEM/GEM seem to start this earlier from DCA-BOS and end it earlier

 

Thanks.  Anxious to see what the Euro shows shortly.  Snow is in the cards, now it's just a matter of how much and where.

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With so many "waves" occurring in such short order, ...2 days ago, last night, tomorrow night... it almost seems as though this is a "pattern event," more so than any single deal.  

almost like lulls in the same extended event -- interesting.   

 

Yeah, this thing first showed up about 3 days ago in GFS's 18z run.  I remember asking folks if they saw it, and of course it was immediately dismissed as typical GFS ana fantasy. Well...here we are..   Still looks rather ana -like to me, though. 

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