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12/14 to 12/15 Snow Storm Observations


WeatherFox

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off topic but interesting is the NAM for next week. Lais down 2-3" over NNJ and it does redevelop for NE. (for those awake and here).

On Topic: Am very interested to read a final synopsis of this one given the stubborn and powerful cold. Did ANY model come close to modeling the cold correctly? It was off more than 10 degrees or more here at midnight on the major models...

The general rule with SW flow events that have a strong high to the north is that the surface warms slower than modeled and the mid-levels warm faster than modeled, leading to more sleet than expected. This was certainly true last night although we did spike to around 40F in Bay Ridge when the marine layer moved inland.

Looks like a weak clipper with 1-3" possible for Tuesday night into early Wesnesday, especially north and west. Surface temps might be questionable right along the coast despite the antecedent cold with highs in the 20s Monday.

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off topic but interesting is the NAM for next week.  Lais down 2-3" over NNJ and it does redevelop for NE. (for those awake and here).

 

On Topic:  Am very interested to read a final synopsis of this one given the stubborn and powerful cold.  Did ANY model come close to modeling the cold correctly?  It was off more than 10 degrees or more here at midnight on the major models...

Poor model performance in my area...had over 4 inches of snow by 5pm (They had closer to an inch) and a decent ice storm after the changeover,  Temps stayed below freezing the entire time.

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While snow depths will look to be significantly less than they were before the freezing rain and then rain hit, unless one had temps well over 40F for an extended time (and I don't think most did), not much melting actually occurred - the reduction in snow depth is mostly due to compaction, as several inches of snow pack can easily absorb the rain that fell.  I'm pretty sure the liquid equivalent of the snow cover this morning on my lawn is very close to what it was last night before the temp went above 32F - it's just much more compacted.  See the excerpt from a NOAA publication below:

 

 

"Air temperature is still the most important factor in melting snow. Rain will usually not add much heat to the process. At 40 degrees, one inch of rain will only produce a tenth of an inch of added water from snow melt. However, rainfall is often accompanied by windy and humid conditions which can greatly accelerate snow melt. At the same time, frozen ground will result in more of the available water running off directly to streams."

 

http://www.crh.noaa.gov/images/dvn/downloads/backgrounder_DVN_Snow_Melt.pdf

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I'm surprised by the amount of rain that fell and how long it lasted...This storm reminds me of January 11th 1991 when a storm with similar results happened but it was a little milder...

We had a strong 700mb-900mb jet with a pwat spike last night. Some convergence along the coastal front as well.

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About 8" total here in Hopewell Junction, Dutchess. Horrible layer of crust to deal with when shoveling. Pretty much in line with the predicted totals from ALY of 8-10

Really? There's wasn't any icing from what I could tell in new windsor area... At my job at West Point there was quit a bit

I think I must have caught some sleet/IP at the tail end of the storm. It doesn't take much! Looking at the historic radar images it looks like it too.

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About 8" total here in Hopewell Junction, Dutchess. Horrible layer of crust to deal with when shoveling. Pretty much in line with the predicted totals from ALY of 8-10

5.9" storm total, about 10 miles north of you on Rt 82. Lots of reports from both my south and north of 7-8" total, and I have about 600 ft elevation. Must have started sleeting a bit earlier. Not a bad event overall.

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About 8" total here in Hopewell Junction, Dutchess. Horrible layer of crust to deal with when shoveling. Pretty much in line with the predicted totals from ALY of 8-10

5.9" storm total, about 10 miles north of you on Rt 82. Lots of reports from both my south and north of 7-8" total, and I have about 600 ft elevation. Must have started sleeting a bit earlier. Not a bad event overall.

Yeah the radar was a little convective towards the end and I think I just lucked out in the last couple hours. I also had 3-4 before the main stuff even arrived. 350 ft elevation here, just west of hopewell.

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Just curious, does anyone know how the NW corner of NJ did?  Latest total from Mt. holly that I saw was from 630PM last night.

 

000

NOUS41 KPHI 150956

PNSPHI

DEZ001>004-MDZ008-012-015-019-020-NJZ001-007>010-012>027-PAZ054-055-

060>062-067>071-152156-

PUBLIC INFORMATION STATEMENT

SPOTTER REPORTS

NATIONAL WEATHER SERVICE MOUNT HOLLY NJ

456 AM EST SUN DEC 15 2013

NEW JERSEY

...BURLINGTON COUNTY...

   FLORENCE               1.8   150 AM 12/15  TRAINED SPOTTER

   MOUNT LAUREL           1.1   539 PM 12/14  NWS EMPLOYEE

   MOUNT HOLLY WFO        1.0   728 PM 12/14  NWS OFFICE

   DELRAN TWP             1.0   759 PM 12/14  NWS EMPLOYEE

...GLOUCESTER COUNTY...

   NATIONAL PARK          0.3   725 PM 12/14  TRAINED SPOTTER

...HUNTERDON COUNTY...

   WHITEHOUSE STATION     5.8   950 PM 12/14  BROADCAST MEDIA

   RINGOES                4.0  1200 AM 12/15  PUBLIC

   THREE BRIDGES          3.0   648 PM 12/14  PUBLIC

   UNION TWP              1.0   146 PM 12/14  PUBLIC

...MERCER COUNTY...

   HOPEWELL TWP           2.9   755 PM 12/14  TRAINED SPOTTER

   1 ESE EWING TWP        2.4   945 PM 12/14  COCORAHS

   1 S TRENTON AIRPORT    2.0   726 PM 12/14  TRAINED SPOTTER

   EWING                  1.2   620 PM 12/14  TRAINED SPOTTER

...MIDDLESEX COUNTY...

   PERTH AMBOY            4.5  1000 PM 12/14  PUBLIC

   PISCATAWAY             4.5  1010 PM 12/14  TRAINED SPOTTER

   SOUTH PLAINFIELD       2.5   820 PM 12/14  TRAINED SPOTTER

   SAYREVILLE             2.5   821 PM 12/14  TRAINED SPOTTER

   MADISON PARK           2.1   824 PM 12/14  TRAINED SPOTTER

...MONMOUTH COUNTY...

   OAKHURST               5.5   542 PM 12/14  TRAINED SPOTTER

   LINCROFT               5.1   720 PM 12/14  TRAINED SPOTTER

   FREEHOLD               5.0   757 PM 12/14  PUBLIC

   HAZLET                 4.5   917 PM 12/14  TRAINED SPOTTER

   COLTS NECK             3.8   706 PM 12/14  TRAINED SPOTTER

   MANALAPAN              3.5   755 PM 12/14  TRAINED SPOTTER

   WAYSIDE                3.5   410 PM 12/14  TRAINED SPOTTER

   MILLSTONE TWP          2.6   330 AM 12/15  TRAINED SPOTTER

   MORGANVILLE            1.7   518 PM 12/14  PUBLIC

...MORRIS COUNTY...

   MILTON                 6.5  1030 PM 12/14  TRAINED SPOTTER

   BUTLER                 6.0  1135 PM 12/14  TRAINED SPOTTER

   HANOVER TWP            5.5  1030 PM 12/14  TRAINED SPOTTER

   RANDOLPH TWP           4.0  1030 PM 12/14  PUBLIC

   ROCKAWAY               2.8   919 PM 12/14  TRAINED SPOTTER

...SOMERSET COUNTY...

   HILLSBOROUGH           5.2   330 AM 12/15  PUBLIC

   BOUND BROOK            4.5   830 PM 12/14  TRAINED SPOTTER

   2 ENE FRANKLIN TWP     4.0   912 PM 12/14  TRAINED SPOTTER

   SOMERSET               4.0   900 PM 12/14  TRAINED SPOTTER

   SOMERVILLE             3.8  1004 PM 12/14  COCORAHS

   BRIDGEWATER TWP        3.8  1010 PM 12/14  TRAINED SPOTTER

   NORTH PLAINFIELD       3.5   821 PM 12/14  TRAINED SPOTTER

   BELLE MEAD             3.0   722 PM 12/14  TRAINED SPOTTER

...SUSSEX COUNTY...

   HIGHLAND LAKES         5.6  1025 PM 12/14  TRAINED SPOTTER

   WANTAGE                2.8   505 PM 12/14  TRAINED SPOTTER

   VERNON VALLEY          2.2   609 PM 12/14  TRAINED SPOTTER

   HARDYSTON TWP          2.0   533 PM 12/14  COCORAHS

...WARREN COUNTY...

   BLAIRSTOWN             8.1   145 AM 12/15  TRAINED SPOTTER

   ASBURY                 7.0  1100 PM 12/14  PUBLIC

   ALLAMUCHY              6.8  1040 PM 12/14  TRAINED SPOTTER

   HACKETTSTOWN           6.0  1100 PM 12/14  TRAINED SPOTTER

   HOPE                   5.5  1000 PM 12/14  TRAINED SPOTTER

   STEWARTSVILLE          4.5  1010 PM 12/14  TRAINED SPOTTER

 

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Same here. that's what you get for living on the South shore on these types of setups.not a big surprise with heavy rain and temps in the 40's for a while last night..oh well it was nice to see while it was falling

Still have about 2 inches. We did hit 40F for a short time but were back below freezing this morning.

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