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Jan. 15-17th, 2024 | NE/MidAtl Winter Storm


MaineJay

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17 minutes ago, MaineJay said:

Today's system was always going to be somewhere near James bay, it was always a question of the phasing.  

 The safe bet is generally on the late phase, but that's also not much fun.  It's still trying to figure it out, and sometimes as the models try to resolve the interactions, they flip flop between kicking and phasing.

  Maybe the recon data finds something that helps us out.

recon_AF305-07WSE-IOP16.thumb.png.7f5706f0649bcdd7bbb967e5827e158b.png

 

Was just going to say lets  wait for the key to the solution to enter the NW I believe sometime tomorrow afternoon/night. then we will see how it’s handled by the models  

then Sunday night, we can all…. See below  

IMG_8467.gif

Edited by Rickrd
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Please , please do not bury this opportunity until later tomorrow , and preferably Sunday. You realize our current cutter has thunder snow, deep low pressure, and torpedoing temps on the back side. Check midwest forum. Think that doesn’t shake up the atmosphere, like shaking a snow globe? Not saying we get whacked, but no way current modeling has this down pat right now. They failed Weather class 101 last week- don’t get me started again. Check the playing field out tomorrow. Don’t do, cough, cough , go all Snobal.

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3 minutes ago, RTC3-LAST CHANCE said:

Please , please do not bury this opportunity until later tomorrow , and preferably Sunday. You realize our current cutter has thunder snow, deep low pressure, and torpedoing temps on the back side. Check midwest forum. Think that doesn’t shake up the atmosphere, like shaking a snow globe? Not saying we get whacked, but no way current modeling has this down pat right now. They failed Weather class 101 last week- don’t get me started again. Check the playing field out tomorrow. Don’t do, cough, cough , go all Snobal.

When storms move through, I'd say more often than not, they move quicker. So im going to be watching if that's kind of thing happens with the current storm. Not saying it being faster would even be a net gain, just that there's still trof evolution to go, so the solution will not necessarily be what we see on they models now.  

  And with stream interactions involved, wider error bounds. This isn't like the recent midweek system that the models had a lock on from T minus 200 hours. That one was a one piece deal really, much simpler from a modeling perspective.

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000
FXUS61 KPHI 130249
AFDPHI

Area Forecast Discussion
National Weather Service Mount Holly NJ
949 PM EST Fri Jan 12 2024

.SYNOPSIS...
A strong frontal system will move across the Mid Atlantic
region tonight while low pressure moves across the Great Lakes
region. This low will drift across eastern Canada Saturday into
Sunday. Meanwhile, a mostly dry cold front will move across the
area Sunday. High pressure will try to briefly inch its way into
the area Sunday night into Monday, before a coastal low moves
northward offshore of the east coast Tuesday into Wednesday.
High pressure builds across the southeast states Wednesday into
Wednesdsay nigith, then offshore Thursday into Thursday night.
Another coastal low is possible next Friday.

&&

.NEAR TERM /THROUGH SATURDAY NIGHT/...
930 PM update... no major changes to the forecast this evening
as rain overspreads the region presently. Looks like snow may be
extremely brief in the Poconos as the lastest observation
already has rain at MPO. Tweaked winds to bring them a bit more
in line with current headlines, but made no headline changes.

4 PM discussion...A strong storm system remains on track to
bring some significant impacts to our region beginning tonight
through Saturday.

A vertically stacked closed surface low will develop over the
southern Plains and deepen rapidly into a ~970 mb low as it
tracks up through the southern Great Lakes tonight. A warm front
will also push up through the Mid- Atlantic region during the
overnight hours leading to a non diurnal temperature swing.
Temps will start to drop with the loss of diurnal heating early
this evening, but then warm air advection will push temps up
well into the 50s through the rest of the night tonight.

Despite a strong push of warm aid advection that will occur
tonight, forecast soundings across the Poconos continue to
indicate that enough cold air may be present initially from the
antecedent high pressure, that some wintry precipitation may
fall at the onset. Guidance over the last couple of runs has
trended a bit higher on QPF so the forecast has been updated to
around a half an inch of snow and before the precip changes
over to rain. Otherwise, rain will overspread the area tonight
from southwest to northeast from about 7 PM to 10 PM. The rain
will end between 3 AM to 6 AM for most areas, though some light
showers may linger into mid Saturday morning.

A strong south-southeast 65-85 kt low level jet will develop
tonight advecting in a rich plume of deep moisture off the
Atlantic. Precipitable water values across most of the region
will range from 1.0-1.5 inches which is above the 90th
percentile for mid- January standards. The strong LLJ in
combination with aided moisture will bring periods of moderate
to at times heavy rainfall across the area. The flood risk will
remain high over the weekend mainly along the main stem rivers
as stream flows are extremely high and for the Passaic basin
many of the gauges will still be in flood stage as the
additional rainfall starts running off. Thus a flood watch
remains in effect for portions of E PA, NJ and DE given the fact
that saturated soils and stream/water levels remain high.
Rainfall amounts will range from 0.5-1.0 inches along the I-95
corridor and points south and east. For areas north and west of
the I-95 corridor, amounts will be a bit higher ranging from
1.0-1.5 inches, with locally up to 2.0 inches possible.

In addition to the low level jet, which will be maximized across
portions of the Delmarva and the Coastal Plain, there will be a
rapidly tightening pressure gradient tonight in response to the
deepening surface low. Current consensus is for a ~28 mb
pressure fall in about 12 hours overnight, which is significant,
though not quite as extreme as the pressure falls observed
Tuesday night. A slight chance of thunder remains in the
forecast with up to 500 J/kg of elevated CAPE available to tap
into. Thus, there will likely be some convective elements to the
rain tonight.

Winds remain a challenging forecast during the overnight hours
as guidance still shows some indications of a weak inversion
right off the surface. With SE flow, the guidance tends to be
slightly overdone, particularly well inland northwest of I-95.
Given the potential for convective elements within the rains
overnight, any heavier bursts of rain could help mix down the
stronger winds in the LLJ, even northwest of I-95. Long story
short, the wind and wind gust forecast has increased slightly
and we`re now forecasting gusts of 40-50 mph for most inland
areas. Given the sensitivity and potential increased impacts due
to the very saturated ground, we opted to expand the Wind
Advisory to cover the entire forecast area. We anticipate the
strongest surge of winds to be somewhat brief, with the gusts
up to 50 mph across the inland areas and near 50-60 mph along
the immediate coastline, as the the cold front moves closer and
the winds veer to more of south to southwest. The immediate
Atlantic coastal strip is forecast to experience sustained winds
of 30 to 40 mph for a few hours, which combined with potential
for gusts up to 60 mph is enough to warrant an upgrade to a High
Wind Warning for this area. Due to extremely saturated soil
moistures, the forecast winds will have the potential to uproot
trees even at slightly lower wind speeds should the observed
winds fall short of the deterministic forecast.

Following the frontal passage on Saturday morning, most areas
will remain dry aside from a few lingering showers possible in
the morning. Winds will remain elevated as the strong pressure
gradient persists between the low pivoting over Canada and high
pressure over the southeast US. This will be accompanied by a
moderate push of cold air advection, where temps on Saturday
will be falling throughout the afternoon after morning temps
rise into the low to mid 50s. Cold air advection will continue
through Saturday night as skies begin to clear with temps
falling into the mid 20s to low 30s by Sunday morning.

The cold advection will support efficient mixing of the
boundary layer during the daytime hours. Model consensus
indicates winds of 30-40 kts within this mixed layer at the 925
mb level. This supports a forecast for wind gusts near 40-50 mph
possible following the post front lull in the winds early in
the morning. Given this potential and the continued sensitivity
of tree damage and power outage potential with the very wet
ground, we`ve opted to extend the Wind Advisory through the
daytime Saturday as well. A Wind Advisory follows the High Wind
Warning for the Atlantic coastal strip.

&&

.SHORT TERM /SUNDAY THROUGH MONDAY/...
Sunday looks pretty windy and colder as a strong arctic front
plows across the region, with temps falling as we head into the
afternoon. Some of the longer range CAMs even suggest a line of
snow showers along the front, so have boosted pops a bit.

Dry conditions are expected to continue across the area Sunday
night into Monday as the high pressure to the west tries to
build into the Mid Atlantic region. As this does so, winds will
diminish as well. These dry conditions probably won`t continue
long. As we move into Monday night, some light precipitation
might develop across the area ahead of an approaching coastal
storm.

&&

.LONG TERM /MONDAY NIGHT THROUGH FRIDAY/...
The coastal storm is expected to move northward offshore of the east
coast Tuesday into Tuesday night. As the storm passes to the east,
enhanced lift and moisture is forecast to develop on the west side
of the system and move across portions of the Mid Atlantic region.
This would lead to a period of precipitation for Tuesday into Tuesday
night, and with cold temperatures forecast, many areas could see some
accumulating snow. However, there still remains a fair amount of
uncertainty with the storm, mostly due to the placement of the
embedded short wave/vorticity max with this system. The GFS and
Canadian bring the short wave across the Mid Atlantic, bringing more
precipitation, while the ECMWF and ICON bring the short wave across
the Great Lakes region, which could hinder precipitation chances.

On Wednesday into Wednesday night, high pressure builds across the
southeast states, before shifting offshore Thursday. While the high
will not be directly over the Mid Atlantic region, it should have
enough of an impact on the area to keep the weather dry Wednesday
into Thursday.

For Friday, there is the potential for another low pressure system
to develop and strengthen near the area. This could bring another
round of precipitation across the area, and with cold
temperatures, snow could be possible again.
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4 minutes ago, Wtkidz said:

ICON  not much to get excited…

 

floop-icon-2024011300.prateptype_cat_icon-imp.conus.gif

Not aimed at you, I just stop reading at Icon generally.  So it being crappy might be a good thing.

 

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1 minute ago, MaineJay said:

Not aimed at you, I just stop reading at Icon generally.  So it being crappy might be a good thing.

 

Would you rather....

Forecast with ICON or NAVGEM

Gotta choose one! 😆

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LWX words about storm

 

Quote
LONG TERM /MONDAY THROUGH FRIDAY/...
Below normal temperatures and the threat for wintry precipitation
headline the medium range. There is medium confidence in well below
normal temperatures and dangerously cold wind chills, but the threat
of snow or wintry precipitation remains highly uncertain.

Anomalous ridging over the Polar regions of the Northern Hemisphere
will force Arctic air southward across much of the CONUS for most of
next week. The brunt of the cold will be on our doorstep locally
early in the week, before spreading over the rest of the area by the
middle of next week. Meanwhile, an area of low pressure - driven by
a shortwave currently trapped in a cyclonic gyre over NW Canada -
will likely induce an area of low pressure that will track from the
Mid-South to near the Carolina or Mid-Atlantic Coast late Monday
through early Wednesday. Exact timing remains uncertain, and timing
of this wave with added energy from the Arctic intrusion will be
crucial in determining the extent of any snow/wintry precip impacts
across the Mid-Atlantic. Deterministic guidance has been attempting
to come into somewhat better agreement, but the Euro (through 06z)
remains a flatter/drier outlier. For this reason, ensemble means and
probabilities have remained nearly steady from values 24 hours ago.

As energy for this system ejects into the NW CONUS and is better
sampled, guidance should get a better handle on the outcome over the
next 1 to 2 days.


Big thing to take away from it.

As energy for this system ejects into the NW CONUS and is better
sampled, guidance should get a better handle on the outcome over the
next 1 to 2 days.

 

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3 minutes ago, JDClapper said:

Would you rather....

Forecast with ICON or NAVGEM

Gotta choose one! 😆

I'd take my chances with the NAV and it's assumed progressive bias

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Just now, MaineJay said:

I'd take my chances with the NAV and it's assumed progressive bias

Yeah, was on the same lines. ICON would be like watching a weather app.. 0z, 42 and rain. 6z, 34 and flurries. 12z, 37 and sunny

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Just now, JDClapper said:

Yeah, was on the same lines. ICON would be like watching a weather app.. 0z, 42 and rain. 6z, 34 and flurries. 12z, 37 and sunny

Oh you mean the BS  that the weather channel does on their app and website. 

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Since we have a break in the action, please cheer me up. Took my wife and son out to celebrate his getting a gov’t defense job upgrade.Serious shit. So i spent the entire night canvassing the place again, to try and figure out who the wifey slept with, cuz their is just no way my genes produced that, and if they did, you wouldn’t be reading this , cuz y’all would be all blowed up. 
So lie, and cheer me up. 

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5 minutes ago, Tater said:

We need something to happen, or we're going to have a bunch of disappointed weather weenies.

Screenshot_20240112_224736_Brave.thumb.jpg.5c1e8542537d40ef9baa5b73302fdba1.jpg

I can still have a good time fishing even if I don't catch a fish. 

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2 minutes ago, Uscg Ast said:

At least the Navgem has the known Bias. The Icon is just... Well its @RTC3-LAST CHANCE linking and drinking. You never know what you got, but its always there 😁

Dang you made me laugh into a coughing fit. Now I woke everyone up. 

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Just now, StretchCT said:

A little better I suppose  could be the orientation of the vorticity that is messing with me though  

trend-gfs-2024011300-f066.500hv.conus.thumb.gif.f249355a75da0382463cdb3800420656.gif

I think we need the current storm to rotate as far westward as possible.

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Icon. German engineering. Any of you who have had the "pleasure" of owning and maintaining a VW or other German car know where I'm going with that.

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