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E PA/NJ/DE Winter 2023-2024 OBS/Discussion


The Iceman
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GFS brings 1-3" back to the general Mount Holly CWA, those NW of 95. It's been clear looking at upper levels that were trending back towards a light advisory event. The 250mb jet continues to improve in orientation

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2 hours ago, yak said:

DT's First Guess Map.  3 inches area wide with inexplicable 3" lollipops in the DC and Philly metro areas.  :huh:

IMG_1035.jpeg

ETA - The map is weird but I think that it is 2" area-wide with the 3" lollipops.

There are parts of NW DC Metro, e.g., Montgomery County, MD, and NW Philly (like where I am), as well as Montgomery County, PA, that have rolling hills with elevations of 300 ft - 400 ft. 

Ever since I was a kid (and even today), I was always fascinated on car trips to Willow Grove traveling north along Easton Rd. - especially going down the hill from Edge Hill Rd to Susquehanna Rd where the Roslyn train station is (which has an at-grade RR crossing, one of the few in the area).

Similarly, I had many work trips down to D.C. metro and specifically the Rockville/Bethesda/Gaithersburg area, where the hills abound (as well as the propensity for severe storms, not unlike Willow Grove).

So far I may have bottomed out at 29 this morning (but will see what happens in the next hour or so) and am currently at 30 with dp 23.  Will be on the lookout for flizzards and whatnot.

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Special Weather Statement from the NWS 
751 AM EST Sun Jan 14 2024

...DANGEROUS SNOW SQUALLS TO IMPACT THE REGION LATE THIS MORNING
INTO THE AFTERNOON HOURS...

One or more bands of snow squalls will be moving east at 50 to 55
mph along the leading edge of an arctic airmass, with the
potential to impact portions of eastern Pennsylvania and adjacent
areas of New Jersey and northern Delaware.

Near whiteout conditions and a quick one half inch of snow in just
10 to 15 minutes will lead to dangerous travel conditions as a
result of the very poor visibility and snow or ice covered roads.
Winds will gust up to 50 mph in the squalls.

If possible, delay any travel until the mid to late afternoon
hours. If you are traveling, your recognition of these squalls
and the actions you take to get off the road or help to gradually
slow traffic could prevent a high speed, multi-vehicle accident
and save your life and the lives of others.

If you see terrain features and objects off in the distance being
obscured by heavy snow within the dangerous snow squalls, take
quick action to pull off the road to a safe location, such as a
parking lot or driveway to wait out the squall.

If you are on an interstate, it`s best to get off the road at the
nearest exit as soon as you notice the squall to ensure the
safety of you and your passengers. If there isn`t an opportunity
to safely exit the interstate, slow down gradually, well before
entering the squall and turn on your flashing hazard lights.
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State College has a Snow Squall Warning up for the area E of town/airport -

Quote

Snow Squall Warning

SNOW SQUALL WARNING
NWS STATE COLLEGE PA
929 AM EST SUN JAN 14 2024

PAC027-035-061-067-087-093-097-109-119-141500-
/O.NEW.KCTP.SQ.W.0012.240114T1429Z-240114T1500Z/
929 AM EST SUN JAN 14 2024
Centre County-Clinton County-Huntingdon County-Juniata County-Mifflin
County-Montour County-Northumberland County-Snyder County-Union
County-

The National Weather Service in State College PA has issued a

* Snow Squall Warning for...
Southeastern Centre County in central Pennsylvania...
Southeastern Clinton County in north central Pennsylvania...
Central Huntingdon County in central Pennsylvania...
Juniata County in central Pennsylvania...
Mifflin County in central Pennsylvania...
Montour County in central Pennsylvania...
Northumberland County in central Pennsylvania...
Snyder County in central Pennsylvania...
Union County in central Pennsylvania...

* Until 1000 AM EST.

* At 929 AM EST, a dangerous snow squall was located along a line
extending from Spruce Run Reservoir to Weikert to near Dudley,
moving east at 35 mph.

HAZARD...Intense bursts of heavy snow. Gusty winds leading to
blowing snow and visibility rapidly falling to less than
one-quarter mile. Wind gusts up to 35 mph.

SOURCE...Radar indicated.

IMPACT...Travel will become difficult and potentially dangerous
within minutes.

For those driving on Interstate 80, this includes areas between the
Loganton and Buckhorn exits, specifically from mile markers 191 to
228.

This includes Interstate 180 from mile markers 1 to 7.

This includes the following highways...
Routes 11 and 15 from THE JUNIATA SNYDER COUNTY LINE to NEAR
SHAMOKIN DAM.
Route 11 from near Shamokin Dam to east of Danville.
Route 15 from near Shamokin Dam to near Montgomery.
Route 22 from Huntingdon to Mount Union.
Routes 22 and 522 from Mount Union to Lewistown.
Routes 22 and 322 from Lewistown to east of Thompsontown.
Route 322 from Potters Mills to Lewistown.
Route 522 from Lewistown to Selinsgrove.
Route 522 from Orbisonia to Mount Union.
State Road 45 from Millheim to Lewisburg.
State Road 61 from Sunbury to Mount Carmel.
State Highway 147 from I-80 to Sunbury.

Locations impacted include...
Sunbury, Lewistown, Shamokin, Huntingdon, Milton, Mount Carmel,
Lewisburg, Selinsgrove, Danville, Northumberland, Mifflinburg, and
Kulpmont.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Slow Down! Rapid changes in visibility and road conditions are
expected with this dangerous snow squall. Be alert for sudden
whiteout conditions.

Reduce speed and turn on headlights! During snow squalls, the
visibility may suddenly drop to near zero in whiteout conditions.

LAT...LON 4077 7639 4066 7671 4059 7717 4056 7717
          4041 7753 4038 7753 4026 7771 4021 7819
          4023 7824 4029 7826 4035 7822 4095 7743
          4108 7718 4109 7698 4115 7696 4115 7664
          4106 7661 4096 7652 4083 7650 4083 7641
          4077 7639

SNOW SQUALL...RADAR INDICATED

$$

Currently have changeable skies (sun has popped out recently) and 36 with dp 26.

kdix_20240114_1432_BR_0.41.png

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Junk and stuff incoming for some!

Quote

Snow Squall Warning

SNOW SQUALL WARNING
NWS MOUNT HOLLY NJ
1110 AM EST SUN JAN 14 2024

NJC019-041-PAC011-017-029-077-091-095-141645-
/O.CON.KPHI.SQ.W.0003.000000T0000Z-240114T1645Z/
1110 AM EST SUN JAN 14 2024
Hunterdon County NJ-Warren County NJ-Berks County PA-Bucks County
PA-Chester County PA-Lehigh County PA-Montgomery County
PA-Northampton County PA-

...A SNOW SQUALL WARNING REMAINS IN EFFECT UNTIL 1145 AM EST FOR
CENTRAL HUNTERDON...SOUTHWESTERN WARREN...SOUTHEASTERN BERKS...
SOUTHEASTERN LEHIGH...NORTHWESTERN MONTGOMERY...NORTHWESTERN BUCKS...
NORTHEASTERN CHESTER AND SOUTHEASTERN NORTHAMPTON COUNTIES...

At 1110 AM EST, a dangerous snow squall was located along a line
extending from Milford to Elverson, moving east at 70 mph.

HAZARD...Intense bursts of heavy snow. Gusty winds leading to
blowing snow and rapidly falling visibility. Wind gusts
greater than 35 mph.

SOURCE...Radar and webcams.

IMPACT...Dangerous and life-threatening travel conditions are
expected to develop rapidly in the warning area.

This includes the following highways...
Pennsylvania Turnpike between mile markers 296 and 317.
Northeast Extension between mile markers 26 and 52.
Interstate 78 in Pennsylvania between mile markers 59 and 76.
Interstate 78 in New Jersey between mile markers 0 and 13.
Interstate 176 in Pennsylvania between mile markers 1 and 8.

Locations impacted include...
Allentown, Easton, Bethlehem, Pottstown, Phoenixville, Lansdale,
Forks, East Norriton, Coatesville, Emmaus, Quakertown, Perkasie,
Doylestown, Byram, Wilson, Downingtown, Souderton, Bedminster,
Hellertown, and Birdsboro.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Consider avoiding or delaying travel until the snow squall passes
your location. If you must travel, use extra caution and allow extra
time. Rapid changes in visibility and slick road conditions may lead
to accidents.

Serious injuries and deaths may result from people exiting their
vehicles during a snow squall. Drivers may not be able to see you or
stop! If you have been involved in an accident or pulled to the side
of the roadway, quickly exit your vehicle and move as far away from
the roadway as possible ONLY when it is safe to do so. Do not stand
along or near the roadway, since approaching vehicles may be unable
to maintain control.

LAT...LON 4080 7514 4045 7477 3997 7578 4007 7594
          4011 7594 4014 7588 4021 7599 4080 7514

SNOW SQUALL...OBSERVED
SNOW SQUALL IMPACT...SIGNIFICANT

$$
Quote

Snow Squall Warning

SNOW SQUALL WARNING
NWS MOUNT HOLLY NJ
1100 AM EST SUN JAN 14 2024

PAC025-089-141630-
/O.CON.KPHI.SQ.W.0001.000000T0000Z-240114T1630Z/
1100 AM EST SUN JAN 14 2024
Carbon County-Monroe County-

...A SNOW SQUALL WARNING REMAINS IN EFFECT UNTIL 1130 AM EST FOR
SOUTHEASTERN CARBON AND CENTRAL MONROE COUNTIES...

At 1059 AM EST, a dangerous snow squall was located along a line
extending from Monticello to near White Haven, moving northeast at 75
mph.

HAZARD...Intense bursts of heavy snow. Gusty winds leading to
blowing snow and rapidly falling visibility. Wind gusts
greater than 35 mph.

SOURCE...Radar and webcams.

IMPACT...Dangerous and life-threatening travel conditions are
expected to develop rapidly in the warning area.

This includes the following highways...
Northeast Extension between mile markers 72 and 82.
Interstate 80 in Pennsylvania between mile markers 301 and 314.
Interstate 80 in New Jersey near mile marker 0.

Locations impacted include...
Lehighton, East Stroudsburg, Palmerton, Jim Thorpe, Stormville,
Henryville, Brodheadsville, New Mahoning, Kunkletown, Werry Lake,
Gilbert, Delaware Water Gap, Tannersville, Alpine Mountain, Rossland,
Kresgeville, Sun Valley, Jonas, Reeders, and Beltzville State Park.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Consider avoiding or delaying travel until the snow squall passes
your location. If you must travel, use extra caution and allow extra
time. Rapid changes in visibility and slick road conditions may lead
to accidents.

Serious injuries and deaths may result from people exiting their
vehicles during a snow squall. Drivers may not be able to see you or
stop! If you have been involved in an accident or pulled to the side
of the roadway, quickly exit your vehicle and move as far away from
the roadway as possible ONLY when it is safe to do so. Do not stand
along or near the roadway, since approaching vehicles may be unable
to maintain control.

LAT...LON 4115 7515 4114 7509 4108 7503 4109 7496
          4099 7513 4097 7513 4093 7522 4085 7532
          4082 7540 4078 7567 4073 7576 4082 7588
          4099 7550 4115 7515

SNOW SQUALL...OBSERVED
SNOW SQUALL IMPACT...SIGNIFICANT

$$

ETA to note that temp here in NW Philly IMBY is 41 with dp 28 so not sure what would happen if that hung together and moved this way. 

kdix_20240114_1605_BR_0.51.png

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