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Jan. 31-Feb. 2 Miller B storm


LVblizzard
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1 minute ago, Birds~69 said:

Been listening to WIP, sad to say no Bruce. Guess I'll have to go w/his 20"/blizzard until further notice... 

If he’s such a weenie, he must know about this place. Wonder if it’s one of us? I bet it’s Greenskeeper!!

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42 minutes ago, Birds~69 said:

Oddly enough Ch10 going w/the same 6-9". First off 6-9" is not a normal range and Ch6 and Ch10 usually don't have the same exact amounts..kinda strange.

CBS3: 5+" Philly and local burbs

FOX29: 6-10" Philly and local burbs

When I say local burbs it's only up to mid Mont/Bucks county. (sharp cut off) Further out burbs 3-6"

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18z WXSIM with a NAM/GFS blend has snow starting by 1pm Sunday with snow totals of 20" to 29"...um no....not happening!

Sunday: Dense overcast. A slight chance of snow in the morning, then a chance of
 snow in the afternoon. High 32. Wind chill ranging from 22 to 26. Wind southeast
 near calm in the morning, becoming 6 mph, gusting to 16 mph, in the afternoon.
 Chance of precipitation 50 percent. Precipitation (liquid equivalent) mostly
 around a tenth of an inch. Snow accumulation about half an inch.
 
 Sunday night: Dense overcast. Snow likely. Breezy. Low 28. Wind chill as low as
 19. Wind east around 11 mph, gusting to 17 mph, in the evening, becoming 14 mph,
 gusting to 21 mph, after midnight. Chance of precipitation 80 percent.
 Precipitation (liquid equivalent) mostly around an inch. Snow accumulation 5 to
 8 inches.

 
 Monday: Dense overcast. Snow likely. Windy. High 33. Wind chill around 20. Wind
 east around 17 mph, gusting to 26 mph. Chance of precipitation 80 percent.
 Precipitation (liquid equivalent) mostly between 1 and 2 inches. Snow
 accumulation 12 to 16 inches.

 
 Monday night: Dense overcast. Snow likely in the evening, then a slight chance
 of snow after midnight. Breezy. Low 30. Wind chill as low as 21. Wind
 north-northeast around 13 mph, gusting to 21 mph. Chance of precipitation 80
 percent. Precipitation (liquid equivalent) mostly between half an inch and one
 inch. Snow accumulation 3 to 5 inches.

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Mt holly afd is a good read:

 

A long duration and complex winter storm is forecast to impact the
Mid-Atlantic region Sunday through Tuesday. This storm is likely to
bring significant accumulating snowfall to portions of the forecast
area. Details follow...

A mid-level trough located across the West Coast will eject quickly
eastward across the Plains on Saturday and stall out across the Ohio
Valley early Sunday. At the surface, low pressure will pass across
the Ohio Valley then weaken Sunday as a new coastal low forms just
south and east of Delaware Bay early Monday. This is a classic
Miller-B low pressure evolution which will ultimately become a
nor`easter. As the surface low develops and quickly deepens
offshore, a strong pressure gradient will yield strong northeasterly
winds. A modest arctic high will be located across eastern Canada
through the period.

As far as precipitation, p-types, and timing, forcing for ascent
(overrunning) will arrive Sunday morning spreading from southwest to
northeast throughout the day. A rather cold and dry airmass will be
in place at the onset (temps in the 10s/20s with dewpoints in the
0s/10s), so precipitation will probably take some time to begin
reaching the surface on Monday. Precip should start out as snow
almost everywhere, except for perhaps the immediate coast which
could see a mix and rain and snow. A surge of warm air advection
associated with the initial surface low should result in a period of
mixing of precipitation and change over to rain Sunday night into
early Monday morning across much of Delmarva and southern/coastal
New Jersey.

By early Monday, the surface low intensifying and pivoting off the
coast will result in increasing winds and increasing cold air
advection as the mean flow turns northeasterly. Impressive wind
fields (925 mb winds 40-50+ kts along and south/east of I-95) will
develop as a result of the gradient leading to strong winds at the
surface. The strongest winds will be along and near the coasts with
gusts possibly in excess of 50 mph. Farther inland, wind gusts of 35-
45 mph will likely be common along and south/east of I-95. As a
result, a change over to all snow is expected on the back side of
the storm, even all the way to the coast, as the system begins
departing into Monday night. Light snow may linger into Tuesday
morning depending on how progressive the storm is.

The exact placement and strength of the low will dictate exactly
where the heaviest snow falls. The complexity of this system lies in
details of the system transitioning from an overruning precip regime
to a mesoscale banding (f-gen) and wrap-around precip regime. The
latest 12Z guidance suite has trended the system a bit southward and
thus colder, which suggests the greatest potential for f-gen banding
across portions of interior southern New Jersey and Delmarva. This
axis can certainly change over the coming forecast updates. Snow
totals in the banding could potentially exceed the broadbrush ~6-8"
storm total snowfall that is currently forecast across much of the
urban corridor and south/east away from the coast. We`ve gone ahead
and issued a Winter Storm Watch for the areas of highest confidence
of potential impacts from this storm. It is important to note that
this will be a abnormally long duration storm (36+ hours of snow and
wintry precipitation), and that the highest snow totals and highest
snowfall rates will likely not be realized until later on in the
event late Monday. The storm total snowfall amounts we are
forecasting encompass the entire event as a whole.

Some light accumulations may occur through early Tuesday, especially
east of Philadelphia as the storm departs. Otherwise, conditions will
be generally improving by late Tuesday and winds will diminish.

&&

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12 minutes ago, The Iceman said:

Oh man get your buns ready for 00z... I have a feeling it could be one of those epic nights after that 18z euro. Keep the totals increasing, I'm pushing my chips in as well. All in. This is going to be an epic one.

I shouldn't say it.....but...48hrs still left to go north

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1) Yes Mt Holly write up was good. 

2) I'm refraining from posting right now, or getting excited, as I've learned the very hard way (as have all of you) that we've been burned SO MANY TIMES on winter setups. There's an excellent article the inquirer put out earlier basically making the point by talking about the improvements in modeling coupled with myriad high profile busts over the last dozen years. Moral of the story is, Philly weather is hard to predict wrt snow. Complex almost always. You've got an elevation change, variable coastal effects (sometimes intrastorm), etc. I'll try to make a call tomorrow night just to be part of the bandwagon bc yolo. The things I DO like about this setup are its long duration, the favorable teleconnection pattern, the existing cold air "cold air is the bully"--> meteo refrain referring to cold air being more dense, thus if you want to bet on something, bet that cold air sticks around longer bc it takes longer to dislodge. The long duration aspect means that if one element underwhelms, say, overrunning, or fgen, there's 2 other components that can make up for it. Much better than a quick hitter that is progged with 2" rates. If you miss an hour, or 2, of those 2" rates bc the low tracks differently than you expect or the column takes longer to saturate than you think, you're sol. With a storm like this, it's kinda lumbering and that makes it harder to bust. The PG is impressive--will be interesting to see what type of warning (*ahem*, if a warning) is hoisted. That all said, this is Philly, my above axiom stands vis a vis the models' ability to prognosticate a major event that doesn't happen. A lot of historical data points to this being a good setup. Air travel is still down though (# flights): weather data from aircraft are fed into the models as part of their initialization. I also tangentially think that climate change may be (possibly) hurting model performance.  Your basic assumptions have to change a bit when the energy budget shifts (e.g. less energy coming through atmos can get back out to space). I'm sure modelers are factoring that in, but, cursorily, I have noticed a trend for models to be more finicky the last several years than in the past, and I do wonder if climatic effects are partially responsible.

 

Anyway, looks promising, but I'm not gonna start letting model variability and run to run updates consume my life till tmrw night. 

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8 hours ago, Hypothetical 240 hour snow said:

What do you all think for South-Central NJ (near Mount Holly)? My sister is supposed to get vaccinated at the South NJ mega site (in Glouchester county) Monday AM, and she is worried about snow impacting her trip to that site.

Maybe check with the site over the weekend - if things evolve "properly", they might close it down for the day Monday, and save her the decision/angst.

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8 hours ago, Hypothetical 240 hour snow said:

What do you all think for South-Central NJ (near Mount Holly)? My sister is supposed to get vaccinated at the South NJ mega site (in Glouchester county) Monday AM, and she is worried about snow impacting her trip to that site.

Many of the SJ vaccine sites have already cancelled for Monday.  Check the specific sites website for details 

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