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12z model discussion jan 2-3 storm 1/1/2014


Zelocita Weather

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Even if the surface reflections still might still be playing catch-up to H5, the storm is in the 24-48hr range now, and it might be a good idea to start looking for model consensus in QPF totals. So here's the 12z roundup for KNYC:

 

NMM: 0.25-0.50" QPF, with a little more to come after 48h

GFS: 0.42"

SUNY MM5 on GFS domain: ~0.40-0.50"

NAM: 0.51"

ARW: ~0.50" QPF, with more to come after 48h

GEFS: 0.50-0.75"

ECMWF: 0.50-0.75"

GGEM: 0.60-0.80" (probably on the lower end of this range)

UKMET: 0.60-0.80"

RGEM: 0.60-0.80" (probably on the higher end of this range)

SUNY MM5 on NAM domain: ~0.70-0.80" 

 

Totally feel free to correct me if I'm wrong on any of these.

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Even if the surface reflections still might still be playing catch-up to H5, the storm is in the 24-48hr range now, and it might be a good idea to start looking for model consensus in QPF totals. So here's the 12z roundup for KNYC:

NMM: 0.25-0.50" QPF, with a little more to come after 48h

GFS: 0.42"

SUNY MM5 on GFS domain: ~0.40-0.50"

NAM: 0.51"

ARW: ~0.50" QPF, with more to come after 48h

GEFS: 0.50-0.75"

ECMWF: 0.50-0.75"

GGEM: 0.60-0.80" (probably on the lower end of this range)

UKMET: 0.60-0.80"

RGEM: 0.60-0.80" (probably on the higher end of this range)

SUNY MM5 on NAM domain: ~0.70-0.80"

Totally feel free to correct me if I'm wrong on any of these.

Looks about right ..6-10" seems safe

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JM1220 since you are 10 minutes from me do you think we will possibly reach double digit snow depth  but also can we be in mid teens Friday and near zero sat morning?

Hard to say. I think we have a shot at approaching zero on Friday Night and we should be in the mid teens as the snow ends on Friday. If the amplified trends continue and we have 0.75" or so liquid, 10" and maybe even 12" is possible. But I don't think we exceed 12" from a storm that's progressive like this and where the best dynamics are offshore. Let's see tonight if the models continue ramping up.

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Even if the surface reflections still might still be playing catch-up to H5, the storm is in the 24-48hr range now, and it might be a good idea to start looking for model consensus in QPF totals. So here's the 12z roundup for KNYC:

NMM: 0.25-0.50" QPF, with a little more to come after 48h

GFS: 0.42"

SUNY MM5 on GFS domain: ~0.40-0.50"

NAM: 0.51"

ARW: ~0.50" QPF, with more to come after 48h

GEFS: 0.50-0.75"

ECMWF: 0.50-0.75"

GGEM: 0.60-0.80" (probably on the lower end of this range)

UKMET: 0.60-0.80"

RGEM: 0.60-0.80" (probably on the higher end of this range)

SUNY MM5 on NAM domain: ~0.70-0.80"

Totally feel free to correct me if I'm wrong on any of these.

With ratios that is a nice 6-10 isolated 12" storm!!

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Even if the surface reflections still might still be playing catch-up to H5, the storm is in the 24-48hr range now, and it might be a good idea to start looking for model consensus in QPF totals. So here's the 12z roundup for KNYC:

 

NMM: 0.25-0.50" QPF, with a little more to come after 48h

GFS: 0.42"

SUNY MM5 on GFS domain: ~0.40-0.50"

NAM: 0.51"

ARW: ~0.50" QPF, with more to come after 48h

GEFS: 0.50-0.75"

ECMWF: 0.50-0.75"

GGEM: 0.60-0.80" (probably on the lower end of this range)

UKMET: 0.60-0.80"

RGEM: 0.60-0.80" (probably on the higher end of this range)

SUNY MM5 on NAM domain: ~0.70-0.80" 

 

Totally feel free to correct me if I'm wrong on any of these.

I would use those and see how the SREF and HRRR  look later and tomorrow    .7 looks right to me  15 to 1 as of right now

I just think 1 more small tick up is possible

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GFS has been the most steady the last 4 or 5 runs and has slowly increased QPF at 12z with 0.50 at NYC.   Overall looks like we are forming a general consensus for a decent snowfall 4 - 8 with some spots maybe to 10 or more for the area more to the east.  It'll be interesting to see where the 18z and 00z suites take us and the higher res models will shed light on any banding potential.

 

Happy New Year.

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Guest Pamela

Everyone except Long Island is below 0 at 06z Saturday.

On January 22, 1961 Upton in Suffolk County, LI saw the temperature fall to -23 F...that is 23 degrees below zero.

That same morning, the lowest temperature recorded in NYC Central Park was +11 F...for a 34 degree spread between the two stations.

So the odds of Long Island being excluded from a sub-zero morning are not good if KNYC & company have one.

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On January 22, 1961 Upton in Suffolk County, LI saw the temperature fall to -23 F...that is 23 degrees below zero.

That same morning, the lowest temperature recorded in NYC Central Park was +11 F...for a 34 degree spread between the two stations.

So the odds of Long Island being excluded from a sub-zero morning are not good if KNYC & company have one.

 

I'm sure that temp was aided by radiational cooling. Any wind and LI will have no chance going below 0. Luckily most models have winds dying down Friday night. We might be able to radiate really well. I think FOK hits at least -5F.

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On January 22, 1961 Upton in Suffolk County, LI saw the temperature fall to -23 F...that is 23 degrees below zero.

That same morning, the lowest temperature recorded in NYC Central Park was +11 F...for a 34 degree spread between the two stations.

So the odds of Long Island being excluded from a sub-zero morning are not good if KNYC & company have one.

 

A few hours of calm winds should do the trick at the usual spots.

WESTHAMPTON BEACH    KFOK   GFS MOS GUIDANCE    1/01/2014  1200 UTC                       DT /JAN   1/JAN   2                /JAN   3                /JAN   4  HR   18 21 00 03 06 09 12 15 18 21 00 03 06 09 12 15 18 21 00 06 12  N/X                    23          37          17          22    -2  TMP  33 32 27 26 28 30 29 32 34 35 35 35 34 31 25 17 19 18 12  4  3  DPT  14 15 16 19 24 26 25 28 28 28 26 26 24 20 13  9  8  4 -1 -8 -5  CLD  BK BK OV OV OV OV OV OV OV OV OV OV OV OV OV OV BK CL CL CL SC  WDR  29 28 00 10 10 08 05 04 03 03 03 02 01 36 34 33 33 32 33 34 00  WSP  09 05 00 01 04 05 09 11 10 10 15 20 20 22 24 20 21 17 13 03 00 
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Guest Pamela

I'm sure that temp was aided by radiational cooling. Any wind and LI will have no chance going below 0. Luckily most models have winds dying down Friday night. We might be able to radiate really well. I think FOK hits at least -5F.

I think you miss my point...wind or no wind, if the temperatures in the UHI of NYC drop below zero, similar numbers will occur on L.I...the question as to whether or not it *would* actually drop below zero was not being addressed.

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