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Interior NW Burbs & Hudson Valley First Half 2017


xram

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56 minutes ago, Animal said:

Mornin weather fan,

regarding the upcoming storm.

mt holly nws is still honking a really good rain storm. They do mention some freezing rain is possible in the higher terrain.

And Upton is saying close but no cigar. A section of their AFD,

Area Forecast Discussion
National Weather Service New York NY
557 AM EST Sat Jan 21 2017
.LONG TERM /SUNDAY NIGHT THROUGH FRIDAY/...
Significant coastal storm likely Sunday Night into Tuesday with
potential high wind...heavy rain...and coastal impacts.

Have issued a High Wind Watch for Long Island, coastal CT, New
York City, and some adjacent parts of urban northeast New Jersey
from late Sunday night into much of Monday night. The watch covers
the time frame when wind gusts in those areas will likely exceed
40 mph, with the highest winds capable of meeting high wind
criteria occurring mainly from late morning into the evening.
Siding with slower/stronger 00Z NAM/03Z SREF as the precursor
synoptic pattern is somewhat blocky, the storm very well could
slow down as it closes off and becomes negatively tilted aloft.
Think sustained east winds in the warning area will reach 30-40
mph with gusts 60-65 mph, with the strongest winds across Long
Island and parts of NYC closest to the ocean. Farther north/west,
wind gusts will likely approach or exceed wind advisory criteria,
reaching 40-50 mph, with the highest speeds closer to the coast
and in the higher elevations. ECMWF ensemble wind probabilities
continue to support this general idea as well, with 80-90%
probability of 50+ kt wind gusts over the ocean waters, and 50%
probability just inland.

Slow moving coastal storm passes just south by Tuesday per model
consensus, with a 1 to 3 inch rainfall likely. The heaviest rain
occurs Monday as trough becomes negatively tilted, and abundant
moisture gets pulled northward ahead of the slowing system.
Plenty of Atlantic moisture advects northward ahead of this low,
with the warmer air riding over the cooler air entrenched over
the northeast.

Diabatical cooling is expected, but perhaps not enough for much
wintry weather across the interior.

Gradually improving conditions occur later Tue into Tue Night as
the upper low pivots northeast and low pressure tracks up the New
England coast.

&&

 

 

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28 minutes ago, gravitylover said:

Kinda crazy the way pretty much all the models show a nearly dry slot east of the HRV and right up the CT River Valley.  I may actually be able to make my road trip relatively easily while all around me it's raging.

06Z NAM is showing only 1.26 of QPF and 06Z GFS is 0.82 for KSWF and both showing all liquid.

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3 minutes ago, hudsonvalley21 said:

And Upton is saying close but no cigar. A section of their AFD,


Area Forecast Discussion
National Weather Service New York NY
557 AM EST Sat Jan 21 2017

.LONG TERM /SUNDAY NIGHT THROUGH FRIDAY/...
Significant coastal storm likely Sunday Night into Tuesday with
potential high wind...heavy rain...and coastal impacts.

Have issued a High Wind Watch for Long Island, coastal CT, New
York City, and some adjacent parts of urban northeast New Jersey
from late Sunday night into much of Monday night. The watch covers
the time frame when wind gusts in those areas will likely exceed
40 mph, with the highest winds capable of meeting high wind
criteria occurring mainly from late morning into the evening.
Siding with slower/stronger 00Z NAM/03Z SREF as the precursor
synoptic pattern is somewhat blocky, the storm very well could
slow down as it closes off and becomes negatively tilted aloft.
Think sustained east winds in the warning area will reach 30-40
mph with gusts 60-65 mph, with the strongest winds across Long
Island and parts of NYC closest to the ocean. Farther north/west,
wind gusts will likely approach or exceed wind advisory criteria,
reaching 40-50 mph, with the highest speeds closer to the coast
and in the higher elevations. ECMWF ensemble wind probabilities
continue to support this general idea as well, with 80-90%
probability of 50+ kt wind gusts over the ocean waters, and 50%
probability just inland.

Slow moving coastal storm passes just south by Tuesday per model
consensus, with a 1 to 3 inch rainfall likely. The heaviest rain
occurs Monday as trough becomes negatively tilted, and abundant
moisture gets pulled northward ahead of the slowing system.
Plenty of Atlantic moisture advects northward ahead of this low,
with the warmer air riding over the cooler air entrenched over
the northeast.

Diabatical cooling is expected, but perhaps not enough for much
wintry weather across the interior.

Gradually improving conditions occur later Tue into Tue Night as
the upper low pivots northeast and low pressure tracks up the New
England coast.

&&

 

 

Yea, Mt Holly does mention there is a slight risk of some flakes on Tuesday as the storm pulls away.

AFD mentions that the there will be dynamics at work, but the storm is expected to weaken as it nears the NJ coast, so no real heavy snow threat etc.

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9 minutes ago, hudsonvalley21 said:

And Upton is saying close but no cigar. A section of their AFD,


Area Forecast Discussion
National Weather Service New York NY
557 AM EST Sat Jan 21 2017

.LONG TERM /SUNDAY NIGHT THROUGH FRIDAY/...
Significant coastal storm likely Sunday Night into Tuesday with
potential high wind...heavy rain...and coastal impacts.

Have issued a High Wind Watch for Long Island, coastal CT, New
York City, and some adjacent parts of urban northeast New Jersey
from late Sunday night into much of Monday night. The watch covers
the time frame when wind gusts in those areas will likely exceed
40 mph, with the highest winds capable of meeting high wind
criteria occurring mainly from late morning into the evening.
Siding with slower/stronger 00Z NAM/03Z SREF as the precursor
synoptic pattern is somewhat blocky, the storm very well could
slow down as it closes off and becomes negatively tilted aloft.
Think sustained east winds in the warning area will reach 30-40
mph with gusts 60-65 mph, with the strongest winds across Long
Island and parts of NYC closest to the ocean. Farther north/west,
wind gusts will likely approach or exceed wind advisory criteria,
reaching 40-50 mph, with the highest speeds closer to the coast
and in the higher elevations. ECMWF ensemble wind probabilities
continue to support this general idea as well, with 80-90%
probability of 50+ kt wind gusts over the ocean waters, and 50%
probability just inland.

Slow moving coastal storm passes just south by Tuesday per model
consensus, with a 1 to 3 inch rainfall likely. The heaviest rain
occurs Monday as trough becomes negatively tilted, and abundant
moisture gets pulled northward ahead of the slowing system.
Plenty of Atlantic moisture advects northward ahead of this low,
with the warmer air riding over the cooler air entrenched over
the northeast.

Diabatical cooling is expected, but perhaps not enough for much
wintry weather across the interior.

Gradually improving conditions occur later Tue into Tue Night as
the upper low pivots northeast and low pressure tracks up the New
England coast.

&&

 

 

Upton has lost their damn mind lol.. I posted a snippet of yesterdays AFD which mentioned accumulating snow for the "NW hills" and now that the models have cooled even more they changed the forecast to mostly rain. No way that forecast will hold if models continue to show what they have the past 12 hrs

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20 minutes ago, snywx said:

Upton has lost their damn mind lol.. I posted a snippet of yesterdays AFD which mentioned accumulating snow for the "NW hills" and now that the models have cooled even more they changed the forecast to mostly rain. No way that forecast will hold if models continue to show what they have the past 12 hrs

Yup. Yesterday they had a mixed bag for much of the event for the Newburgh area in the point and click. Today, it's all liquid. I think it might come down to "nowcasting" and elevation.

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24 minutes ago, hudsonvalley21 said:

Yup. Yesterday they had a mixed bag for much of the event for the Newburgh area in the point and click. Today, it's all liquid. I think it might come down to "nowcasting" and elevation.

Totally agree, this is a nowcasting event. Depending on how wrapped up this storm gets and if diabatical cooling occurs I think  up here we could have some surprises.

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3 minutes ago, UlsterCountySnowZ said:

 

The  Nam would be the biggest sleet storm in recent memory...3-5" of pure sleet... id say that would be worth seeing 

2rzx89d.jpg

We'll see, I'm just not feeling it. And while a sleet storm would be cool it's also kind sad considering we are heading into the coldest part of the year on average. 

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Latest from Mt Holly NWS.

Apparently, it will come down to which model is right regarding precip type/totals in our portal.

Conditions get complicated on Monday.

NAM continues to carry a colder solution on Monday compared to
the GFS/ECMWF, and this results in a period of wintry precip,
mainly to the north of I-80, across the Poconos. Since the
column of colder air is a bit deeper compared to previous runs,
will carry a forecast of rain and sleet and will take out the
mention of freezing rain.

Another aspect of not for Monday is that both the 12Z GFS and
the 12Z ECMWF almost have a secondary low forming over the
western Atlantic, and that tracks to the north and east and well
offshore. What this appears to be doing is taking the heavy
rain with it, and as a result, the heaviest of the rain is
falling over the Atlantic waters. NAM continues to have this
area of heavy rain along the coast. For now, expecting the
heaviest of the rain to fall from after midnight Sunday night
through early Monday afternoon. By this time, the surface low
will be over the Mid-Atlantic, and then will begin to move
offshore by Monday evening. The overall big picture of the storm
remains in place, but there are some timing issues that have to
be watched.

 

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