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December 17th Clipper Discussion


ORH_wxman

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Looks like whatever we get before 1pm is bonus in SNE.. then we get some good snows something like 1-7pm.. and by the looks of how the snow is falling with a "unspectacular" radar i think this one has the chance to overperform.. should be closing in on an inch.. with snow coming down for 2.5 hours now.. I'll call this rate flurries with ocassionally light to moderate snow

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HRRR made a pretty serious change this run through 7 hours.  I don't know..tough call.  Something is amiss here.

 

GFS may be overdoing it which would mean maybe just eastern areas get nipped? 

 

I think a general 4-5 with 6" amounts should cover it, but I leave the door open for a bit more in mesoscale banding.  It's one of those things where we all know the risks..but it probably wouldn't be a good idea to go with the most snow situation.

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I think a general 4-5 with 6" amounts should cover it, but I leave the door open for a bit more in mesoscale banding.  It's one of those things where we all know the risks..but it probably wouldn't be a good idea to go with the most snow situation.

 

Seems reasonable.  HRR came around totally at 12z to the trailing moisture.

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Should be fun this afternoon for a few hours.

 

                         Station ID: KTAN Lat:   41.87 Long:  -71.02                                                         NAM Model Run: 12Z DEC 17, 2013                                                                                                                                                                                                                         Forecast Hours:    0hr    6hr   12hr   18hr   24hr   30hr   36hr                                                            Sfc Prs(mb):    1022.7 1020.3 1011.4 1008.2 1007.1 1009.8 1015.3                                                            Mean SLP (mb):  1024.6 1022.1 1013.0 1009.9 1008.8 1011.5 1017.0                                                            2m agl Tmp (F):   15.5   26.3   33.9   30.2   26.0   34.1   30.8                                                            2m agl Dewpt(F):   8.6   21.8   32.6   28.4   24.1   27.2   23.9                                                            2m agl RH (%):      74     83     95     93     93     75     75                                                            10m agl Dir:       348     89     96    330    315    302    289                                                            10m agl Spd(kt):     4     10      8     11     16     15     13                                                            6hr Precip (in):  0.00   0.01   0.27   0.07   0.00   0.00   0.00                                                            AccumPrecip(in):  0.00   0.01   0.28   0.35   0.35   0.35   0.35                                                            Sfc CAPE (J/kg):   0.0    0.4    0.7    0.0    0.0    7.8    0.0                                                            Sfc CINH (J/kg):   0.0   -0.4   -0.1    0.0    0.0   -0.2   -1.7                                                            0-3km Hel(J/kg): 165.4  509.5  816.2  185.2   70.0   17.6  103.8                                                            Precip H20 (in):  0.16   0.41   0.55   0.41   0.28   0.24   0.21                                                            Lifted Index(C):  15.9    7.7    3.1    6.1    5.5    9.5   16.1                                                            700mb VV(-ub/s):  -0.4    3.8    2.7   -5.6    0.6   -0.4   -0.9                                                            Thk1000-500mb(m)5242.6 5253.9 5310.7 5292.2 5214.5 5167.0 5205.2                                                            Thk1000-850mb(m)1254.8 1267.7 1296.2 1294.4 1277.6 1274.9 1269.1                                                            Thk850-700mb(m):1492.8 1504.3 1518.9 1511.6 1494.8 1473.0 1474.6                                                            SWEAT Index:      94.9  206.2  331.8  104.1  121.3   91.4  121.6                                                            Total Totals Idx  27.8   48.3   53.6   48.9   50.6   44.5   30.0                                                            Frz Hgt(ft amsl)    43     43    861     43     43    280     43                                                            0WetBlbHgt(amsl) -1000  -1000    584  -1000  -1000  -1000  -1000                                                            Equil Prs (mb):   1023   1020   1011   1008   1007    861    897                                                            Equil Hgt(amsl):    43     43     43     43     43   4158   3240                                                            Hail Size(in):    0.00   0.00   0.00   0.00   0.00   0.00   0.00                                                            Conv Wind Gust:    9.3   12.1   41.7    9.9    8.0    8.9   11.7                                                            Showalter Index:  15.6    7.7    3.5    6.1    5.9    9.7   17.0                                                            Cap Strength(C):-999.9 -999.9 -999.9 -999.9 -999.9    0.0    0.0                                                            Storm Dir (deg):   297    269    247    260    301    324    330                                                            Storm Spd (kts):    22     28     31     24     20     21     28                                                            2m HeatIndex(F):    16     26     34     30     26     34     31                                                            2m WindChill(F):     8     16     26     20     12     24     20                                                                                                                               

 

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Just got a look at the 6z GFS. Each run for the last 5 runs has ticked up .15-.20" qfp. Crazy trend, hard to believe. At this rate the 12z will be close to 1" in much of EMA. Tough call, this kind of reminds me of the Dec 2007(or 2008 can't remember?) bomb, that snuck up on us creating the worste rush hour traffic I've ever seen in the city, took me 7 hours to go 30 miles.

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I think there may be an enhanced band just NW of the low. Sort of a cstl front convergence deal. This is different from deformation banding in NE MA.

 

I don't think I can buy a low track over the canal this time.  The drier models are also the ones so close to the coast.  Something has to give. 

 

The RAP/HRRR etc....each run they're tucking the followup moisture further up the coast off the Delmarva.  The Euro misses with that but then again the Euro IMO has been woeful with this system and isn't likely to be right.  There's going to be considerable follow on moisture question is does it just miss SE or does it get parts of the region.

 

Still shocked at the rate of change in even in the rapid cycle models.   The RAP continues to weaken that s/w responsible for this first system each run.

 

EDIT:  What i'm getting at is the rate of change is steady and pretty rapid towards a good solution.  BUT not sure it's enough that I can buy the GFS yet.  If the GFS comes in the same this run..or the RGEM holds serve we toss the others.  I think it'll be precipitating in eastern areas NE areas most of the night.

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