Alert archive / Pennsylvania / Snow Squall Warnings in 2024

Snow Squall Warning 3, NWS Philadelphia/Mount Holly

January 14, 20246 counties in Pennsylvania; Hunterdon County, Warren County, New Jersey

NWS Philadelphia/Mount Holly issued this snow squall warning at Jan 14, 2024, 11:07 AM EST for 6 counties in Pennsylvania; Hunterdon County, Warren County, New Jersey. It was in force for 38 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued
Jan 14, 2024, 11:07 AM EST (16:07 UTC)
Expired
Jan 14, 2024, 11:45 AM EST
In force
38 min
Issued by
NWS Philadelphia/Mount Holly
Area
Storm-based polygon

Counties Hunterdon County, NJ, Warren County, NJ, Berks County, PA, Bucks County, PA, Chester County, PA, Lehigh County, PA, Montgomery County, PA, Northampton County, PA

The radar

The Philadelphia radar (KDIX), 107 km from the middle of the area, began a volume at 16:09 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

The nearest sounding before it

Washington/Dulle, VA (KIAD), launched 12:00Z, 4.1 hours before the alert went out and 218 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.

Skew-T log-pSkew-T log-p diagram, Washington/Dulle, VA at 12:00Z on 2024-01-14Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Washington/Dulle, VA at 12:00Z on 2024-01-14The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 190 square meters per square second.1939587897117136156175Sfc1 km3 km6 km9 kmRMLM
The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.
Mixed-layer CAPE
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
1565 m above ground
0-6 km bulk shear
92 kt
0-1 km storm-relative helicity
190 m²/s²
0-3 km storm-relative helicity
149 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

375 
WWUS51 KPHI 141607
SQWPHI

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Snow Squall Warning
National Weather Service Mount Holly NJ
1107 AM EST Sun Jan 14 2024

NJC019-041-PAC011-017-029-077-091-095-141645-
/O.NEW.KPHI.SQ.W.0003.240114T1607Z-240114T1645Z/
Hunterdon NJ-Warren NJ-Berks PA-Lehigh PA-Montgomery PA-Bucks PA-
Chester PA-Northampton PA-
1107 AM EST Sun Jan 14 2024

The National Weather Service in Mount Holly NJ has issued a

* Snow Squall Warning for...
  Central Hunterdon County in northwestern New Jersey...
  Southwestern Warren County in northwestern New Jersey...
  Southeastern Berks County in eastern Pennsylvania...
  Southeastern Lehigh County in eastern Pennsylvania...
  Northwestern Montgomery County in southeastern Pennsylvania...
  Northwestern Bucks County in southeastern Pennsylvania...
  Northeastern Chester County in southeastern Pennsylvania...
  Southeastern Northampton County in eastern Pennsylvania...

* Until 1145 AM EST.

* At 1107 AM EST, a dangerous snow squall was located along a line
  extending from Milford to near Elverson, moving east at 70 mph.

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

  SOURCE...Radar and webcams.

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

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...

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

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.

&&

LAT...LON 4080 7514 4045 7477 3997 7578 4007 7594
      4011 7594 4014 7588 4021 7599
TIME...MOT...LOC 1607Z 249DEG 61KT 4057 7510 4014 7580 

SNOW SQUALL...OBSERVED

$$

MJL
2 follow-up statements
743 
WWUS51 KPHI 141610
SQWPHI

Snow Squall Warning
National Weather Service 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/
Hunterdon NJ-Warren NJ-Berks PA-Lehigh PA-Montgomery PA-Bucks PA-
Chester PA-Northampton PA-
1110 AM EST Sun Jan 14 2024

...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
TIME...MOT...LOC 1610Z 270DEG 61KT 4057 7510 4014 7580 

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

$$

MJL
432 
WWUS51 KPHI 141645
SQWPHI

Snow Squall Warning
National Weather Service Mount Holly NJ
1145 AM EST Sun Jan 14 2024

NJC019-041-PAC011-017-029-077-091-095-141654-
/O.EXP.KPHI.SQ.W.0003.000000T0000Z-240114T1645Z/
Hunterdon NJ-Warren NJ-Berks PA-Lehigh PA-Montgomery PA-Bucks PA-
Chester PA-Northampton PA-
1145 AM EST Sun Jan 14 2024

...THE SNOW SQUALL WARNING FOR CENTRAL HUNTERDON...SOUTHWESTERN
WARREN...SOUTHEASTERN BERKS...SOUTHEASTERN LEHIGH...NORTHWESTERN
MONTGOMERY...NORTHWESTERN BUCKS...NORTHEASTERN CHESTER AND
SOUTHEASTERN NORTHAMPTON COUNTIES WILL EXPIRE AT 1145 AM EST...

The snow squall that prompted the warning has exited the area.
Therefore, the snow squall warning will be allowed to expire. Areas 
of blowing snow will continue to make travel difficult. A Snow 
Squall Warning remains in effect for southeastern Berks, Montgomery, 
and Chester counties unitl 1230 PM EST.

LAT...LON 4080 7514 4045 7477 3997 7578 4007 7594
      4011 7594 4014 7588 4021 7599
TIME...MOT...LOC 1644Z 249DEG 61KT 4076 7445 4033 7515 

$$

MJL

The office that day

Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Jan 14, 2:48 AM ESTWind AdvisoryPHIBerks, Bucks, Carbon, Chester, Delaware, Lehigh and 4 more15 hr
Jan 14, 10:28 AM ESTSnow Squall Warning Significant damage threatPHICarbon, Monroe62 min
Jan 14, 10:43 AM ESTSnow Squall WarningPHIBerks47 min
Jan 14, 11:30 AM ESTSnow Squall Warning Significant damage threatPHICarbon, Monroe60 min
Jan 14, 11:42 AM ESTSnow Squall Warning Significant damage threatPHIBerks, Chester, Montgomery48 min
Jan 14, 11:44 AM ESTSnow Squall WarningPHIBucks61 min
Jan 14, 11:57 AM ESTSnow Squall WarningPHIChester48 min
Jan 14, 12:17 PM ESTSnow Squall WarningPHIBucks, Chester, Delaware, Montgomery, Philadelphia28 min
Jan 14, 12:24 PM ESTSnow Squall Warning Significant damage threatPHIMonroe28 min
Jan 14, 12:28 PM ESTSnow Squall WarningPHIChester20 min
Jan 14, 1:31 PM ESTSnow Squall WarningPHIMiddlesex, Monmouth, Ocean29 min

Nearby

Snow Squall Warnings in Pennsylvania, 2024Snow Squall Warnings in New Jersey, 2024Every snow squall warning in 2024

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.