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January 23rd-24th Storm Threat


Rjay

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It appears that the Tropical Tidbits snow maps remain unfixed. They are currently showing spurious appreciable to even significant snowfall in areas that will see little or no accumulating snow as per the soundings. In southern NJ, there will very likely be no snow or sleet, but the maps are showing around 5" snow and sleet.

Caution is advised when looking at the NAM solution. The NAM is not as cold or snowy as the snow product suggests.

TTmap0122201712zNAM.jpg

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Upton pretty bulllish on this storm:

.SHORT TERM /6 PM THIS EVENING THROUGH TUESDAY/...
Significant coastal storm expected late tonight into Tuesday with
high winds, heavy rain, and coastal impacts.

A closed low over the southern Plains will continue to intensify
and move east to the southern Mid Atlantic region on Monday. The
eventual result will be a strong surface low developing over the
Southeast states Sunday night and riding up the coast through
Monday, reaching a position just south of Long Island by late
Monday night. The low will interact with high pressure building
south from Quebec to produce a very tight pressure gradient and
long easterly fetch from south of Newfoundland. Model spread is
closing with regard to timing of the strongest winds and heaviest
rain, with the strongest winds expected Monday afternoon and
evening.

Strong Winds...upgraded coastal areas to a high wind warning for
high confidence in sustained 30-40 mph with gusts 60-70 mph.
Highest winds expected across Long Island, particularly on the
east end and along the south shore. This based on excellent
potential for downward momentum transfer of a 70-75 kt 950-975 mb
LLJ via both mixing in either a well-mixed or moist absolutely
unstable boundary layer. The storm also presents high potential
for a gravity wave event to unfold and enhance downward momentum
transfer, as a highly unbalanced/ageostrophic upper level flow
develops in the exit region of an intense upper jet streak moving
up the coast, with large duct function values present in the low
levels over and just south of the CWA.

PW of 3-4 standard deviations above avg continues to be signaled.
Coastal front development and orographic lift over eastern faces
of hilly terrain will be favored for the heaviest rainfall.
Embedded convection not out of the question late Monday/Mon eve
ahead of approaching closed low and with warm conveyor belt
feeding into the region. Based on ensemble/operational output,
expect rainfall of 1-3 inches with locally higher amounts.

Models still indicated low-level CAD under an H7-8 warm nose late
tonight through Monday afternoon over the region. Based on strong
dynamics and a deep enough cold layer well NW of NYC Mon, should
see a prolonged mix of sleet and rain well NW of NYC through the
day on Mon mainly across Orange/Putnam/W Passaic, where up to an
inch of accumulating sleet is possible, with lower amounts across
interior SW CT along/north of I-84.

Winds and heavy precip should fall off later Mon Night from wet-
east as the LLJ moves NE...but how quickly is still in question.

The slow moving storm will pass on Tuesday. With the associated
upper level low remaining over the region, will continue to
mention likely/cat PoP mainly in the morning.

&&
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2 minutes ago, donsutherland1 said:

It appears that the Tropical Tidbits snow maps remain unfixed. They are currently showing spurious appreciable to even significant snowfall in areas that will see little or no accumulating snow as per the soundings. In southern NJ, there will very likely be no snow or sleet, but the maps are showing around 5" snow and sleet.

Caution is advised when looking at the NAM solution. The NAM is not as cold or snowy as the snow product suggests.

TTmap0122201712zNAM.jpg

The ptype/sounding profile I posted a few min ago is a much better portrayal 

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Coastal flooding might hit major levels at the most vulnerable spots:

.TIDES/COASTAL FLOODING...
A strong coastal storm will impact 2 successive high tide cycles of
at least minor coastal flooding. The first tide cycle to be impacted
is late tonight into early Monday morning. Minor coastal flooding is
expected in spots as astronomical tides run a little higher than the
late afternoon/evening tides. East/northeast winds are increasing
during this time, but will not be quite at their peak.

Expect the lower NY Harbor areas to experience minor coastal
flooding, along with the South Shore and eastern bays of Long
Island, and western Long Island Sound.

Then, attention turns toward the next high tide cycle late Monday
afternoon/evening. Potential for moderate coastal flooding for
southern and eastern bays and beachfront communities of LI with this
Monday evening high tide, and widespread minor coastal flooding
elsewhere.

The moderate coastal flood potential will increase if the slower
coastal low movement (stronger E/NE winds Mon evening) comes to
fruition...with even a low potential for major flood thresholds to
be reached in the most vulnerable communities such as Lindenhurst
and Freeport. A coastal flood watch has been issued to address this
moderate flood threat. Minor coastal flooding could linger for the
southern and eastern bay areas for the Tuesday morning high tide
cycle as well.

An ensemble of guidances is showing potential for surge to build to
2 to 3 ft Mon am...and 3 1/2 to 4 1/2 ft by Monday evening.

The highest threat for coastal impacts will be for flood prone
locales along the south shore bays of LI/NYC...eastern bays of
LI...lower NY/NJ harbor including tidally affected rivers...and
western LI Sound.

The other concern will be for widespread dune erosion and localized
washovers at Atlantic ocean beaches from elevated waters levels
and an east to west sweep of 8 to 12 ft surf Mon into Tue.
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2 minutes ago, UlsterCountySnowZ said:

I'm not quite sure I see snow per say.. heavy sleet with some flakes mixed... but someone up in this area could very potential hit isothermic and turn over for some heavy snowfall.. most likely north or west of me 

Sleet will account for most of your frozen precipitation. Even as some snow may fall at the height of the storm and just before it departs, I don't think it will accumulate much if at all.

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11 hours ago, Rjay said:

I would love if Forky could talk a little about the wind potential.  Any inversions to prevent some of the stronger winds from mixing down?  If so, can we mix down some of the winds below 900 mb?

Bump for anyone who can answer this.

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You would think reading this thread that the only thing that matters with the upcoming storm is how much frozen the interior Northeast receives.

I guess it's tough to get people interested in a high wind, heavy rain, and coastal flooding event outside of hurricane season.

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8 minutes ago, bluewave said:

You would think reading this thread that the only thing that matters with the upcoming storm is how much frozen the interior Northeast receives.

I guess it's tough to get people interested in a high wind, heavy rain, and coastal flooding event outside of hurricane season.

Hi. Give me all the weather :) - Honestly, it's an ominous event. I hope folks along the coast are taking this seriously & that everyone is prepared for at least some power outages.

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10 minutes ago, bluewave said:

You would think reading this thread that the only thing that matters with the upcoming storm is how much frozen the interior Northeast receives.

I guess it's tough to get people interested in a high wind, heavy rain, and coastal flooding event outside of hurricane season.

Surprised more Long Island posters arent actively discussing this... could be extreme for areas like Suffolk 

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16 minutes ago, bluewave said:

You would think reading this thread that the only thing that matters with the upcoming storm is how much frozen the interior Northeast receives.

I guess it's tough to get people interested in a high wind, heavy rain, and coastal flooding event outside of hurricane season.

Probably it's because we can get high wind, heavy rain and coastal flooding outside of winter, everyone wants frozen precip in winter for the most part.

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I feel like commuting on the LIRR to the city tomorrow is going to be a nightmare and I should work from home. But nobody in the real world pays attention a "high wind warning". If we had tropical storm warnings up the collective media would be losing its mind. 

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7 minutes ago, uofmiami said:

Probably it's because we can get high wind, heavy rain and coastal flooding outside of winter, everyone wants frozen precip in winter for the most part.

this looks like the most impressive easterly wind event since sandy

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24 minutes ago, bluewave said:

You would think reading this thread that the only thing that matters with the upcoming storm is how much frozen the interior Northeast receives.

I guess it's tough to get people interested in a high wind, heavy rain, and coastal flooding event outside of hurricane season.

Been getting at this for days.   Thanks

 

11 minutes ago, forkyfork said:

the models are showing 50-60 kts right below the inversion

 

Appreciate the input Forky.   I basically saw the same thing but wasn't sure enough to post it.

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38 minutes ago, bluewave said:

You would think reading this thread that the only thing that matters with the upcoming storm is how much frozen the interior Northeast receives.

I guess it's tough to get people interested in a high wind, heavy rain, and coastal flooding event outside of hurricane season.

I love all extreme weather and am looking forward to this storm...just been so damn busy haven't posted much.

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