Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2020

Severe Thunderstorm Warning 294, NWS Philadelphia/Mount Holly

November 15, 20207 counties in Pennsylvania; 4 counties in New Jersey

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Nov 15, 2020, 6:44 PM EST for 7 counties in Pennsylvania; 4 counties in New Jersey. It was in force for 76 min. 30 reports came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued: Nov 15, 2020, 6:44 PM EST (23:44 UTC)
Expired: Nov 15, 2020, 8:00 PM EST
In force: 76 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

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

The radar

The Philadelphia radar (KDIX), 103 km from the middle of the area, began a volume at 23:48 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.

What was reported inside it

Time	Report	Where	Remark
Nov 15, 6:54 PM EST	TSTM WND DMG	1 Ssw Earl Twp, PA	DOWNED TREE ON SUNSET HILL ROAD. TIME ESTIMATED FROM RADAR.
Nov 15, 6:56 PM EST	TSTM WND DMG	1 S Earl Twp, PA	DOWNED TREE NEAR THE INTERSECTION OF LAUREL ROAD AND PINE ROAD. TIME ESTIMATED FROM RADAR.
Nov 15, 6:58 PM EST	TSTM WND DMG	3 Sw Allentown, PA	REPORTS OF DOWNED TREES AND WIRES NEAR LINDBERG AVENUE. TIME ESTIMATED FROM RADAR.
Nov 15, 7:02 PM EST	TSTM WND GST 53	Whitehall Twp, PA
Nov 15, 7:04 PM EST	TSTM WND DMG	2 Sse Zionsville, PA	TREE DOWN INTO A VEHICLE, NO INJURIES OR ENTRAPMENT. TIME ESTIMATED.
Nov 15, 7:05 PM EST	TSTM WND DMG	Salisbury Twp, PA	TREE DOWN INTO WIRES, STILL ENERGIZED. TIME ESTIMATED.
Nov 15, 7:06 PM EST	TSTM WND DMG	3 Wnw Perkiomenville, PA	DOWNED TREE ON LAYFIELD ROAD NEAR DEEP CREEK ROAD. TIME ESTIMATED FROM RADAR.
Nov 15, 7:08 PM EST	TSTM WND DMG	3 Ssw Coopersburg, PA	DOWNED TREE IN WIRES NEAR GRANT ROAD. TIME ESTIMATED FROM RADAR.
Nov 15, 7:10 PM EST	TSTM WND DMG	2 Ene Center Valley, PA	MPING REPORT OF TREES UPROOTED OR SNAPPED. TIME ESTIMATED FROM RADAR.
Nov 15, 7:12 PM EST	TSTM WND DMG	1 Ne Wind Gap, PA	SEVERAL LARGE TREES AND LIMBS DOWN IN THE AREA. TIME ESTIMATED FROM RADAR.
Nov 15, 7:12 PM EST	TSTM WND DMG	1 Nne Arlington Heights, PA	DOWNED TREE ON CHRISTOPHER STREET NEAR NORTH 5TH STREET. TIME ESTIMATED FROM RADAR.
Nov 15, 7:12 PM EST	TSTM WND DMG	1 Wnw Cedarville, PA	DOWNED TREE ON SCHOLL ROAD NEAR WEST SCHUYLKILL ROAD. TIME ESTIMATED FROM RADAR.
Nov 15, 7:14 PM EST	TSTM WND DMG	Bushkill Twp, PA	TREES AND WIRES DOWN IN BUSHKILL TOWNSHIP.
Nov 15, 7:15 PM EST	TSTM WND DMG	3 Se Bally, PA	DOWNED POWER POLES AND LINES NEAR WEST BRANCH ROAD AND WILD RUN ROAD. TIME ESTIMATED FROM RADAR.
Nov 15, 7:16 PM EST	TSTM WND DMG	Pen Argyl, PA	TREES AND WIRES DOWN IN PENN ARGYL BOROUGH.
Nov 15, 7:17 PM EST	TSTM WND DMG	Washington Twp, PA	TREES AND WIRES DOWN IN WASHINGTON TOWNSHIP.
Nov 15, 7:18 PM EST	TSTM WND DMG	2 S Tatamy, PA	MPING REPORT OF TREE LIMBS DOWN. TIME ESTIMATED FROM RADAR.
Nov 15, 7:22 PM EST	TSTM WND DMG	2 N East Rockhill Twp, PA	MPING REPORT OF DOWNED TREE LIMBS. TIME ESTIMATED FROM RADAR.
Nov 15, 7:24 PM EST	TSTM WND DMG	2 Wnw Spring City, PA	DOWNED TREE ON SCHUYLKILL ROAD NEAR REITNOUR ROAD. TIME ESTIMATED FROM RADAR.
Nov 15, 7:26 PM EST	TSTM WND DMG	Blairstown, NJ	SEVERAL REPORTS OF DOWNED TREES AND WIRES IN THE AREA. TIME ESTIMATED FROM RADAR.
Nov 15, 7:26 PM EST	TSTM WND DMG	Bloomsbury, NJ	SEVERAL REPORTS OF DOWNED TREES AND WIRES IN THE AREA. TIME ESTIMATED FROM RADAR.
Nov 15, 7:28 PM EST	TSTM WND DMG	1 Nnw Hope, NJ	MPING REPORT OF TREES AND POWER POLES DOWN. TIME ESTIMATED FROM RADAR.
Nov 15, 7:36 PM EST	TSTM WND DMG	1 Sw Eagleville, PA	TREE DOWN ON EAGLEVILLE ROAD. TIME ESTIMATED.
Nov 15, 7:37 PM EST	TSTM WND GST 56	Stewartsville, NJ
Nov 15, 7:39 PM EST	TSTM WND GST 58	Stewartsville, NJ	CORRECTS PREVIOUS TSTM WND GST REPORT FROM STEWARTSVILLE.
Nov 15, 7:40 PM EST	TSTM WND DMG	2 Wnw Fricks, PA	DOWNED TREE IN WIRES NEAR KEYSTONE DRIVE. TIME ESTIMATED FROM RADAR.
Nov 15, 7:50 PM EST	TSTM WND DMG	Hamburg, NJ	SEVERAL REPORTS OF DOWNED TREES AND WIRES IN THE AREA. TIME ESTIMATED FROM RADAR.
Nov 15, 7:55 PM EST	TSTM WND DMG	2 Ene Lambertville, NJ	SEVERAL TREES AND BRANCHES DOWN, ONE OF WHICH SNAPPED A POWER POLE AND KNOCKED DOWN A TRANSFORMER. TIME ESTIMATED FROM RADAR.
Nov 15, 7:55 PM EST	TSTM WND GST 47	4 Sw Wantage, NJ	POWER OUTAGES REPORTED IN THE AREA.
Nov 15, 8:00 PM EST	TSTM WND GST 62	2 Sw Vernon, NJ	VERNON TWP NJWXNET GAUGE.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Nov 15, 5:35 PM EST	Severe Thunderstorm Watch	SPC	5 hr

The nearest sounding before it

Brookhaven, NY (KOKX), launched 12:00Z, 11.7 hours before the alert went out and 173 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 1363 m above ground
0-6 km bulk shear: 34 kt
0-1 km storm-relative helicity: 92 m²/s²
0-3 km storm-relative helicity: 172 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

391 
WUUS51 KPHI 152344
SVRPHI
NJC019-027-037-041-PAC011-017-029-077-089-091-095-160100-
/O.NEW.KPHI.SV.W.0294.201115T2344Z-201116T0100Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mount Holly NJ
644 PM EST Sun Nov 15 2020

The National Weather Service in Mount Holly NJ has issued a

* Severe Thunderstorm Warning for...
  Hunterdon County in northwestern New Jersey...
  Central Morris County in northern New Jersey...
  Sussex County in northwestern New Jersey...
  Warren County in northwestern New Jersey...
  Southeastern Berks County in eastern Pennsylvania...
  Southeastern Lehigh County in eastern Pennsylvania...
  Montgomery County in southeastern Pennsylvania...
  Bucks County in southeastern Pennsylvania...
  Northeastern Chester County in southeastern Pennsylvania...
  Eastern Monroe County in northeastern Pennsylvania...
  Northampton County in eastern Pennsylvania...

* Until 800 PM EST.

* At 643 PM EST, intense showers and some embedded severe 
  thunderstorms were located along a line extending from near 
  Sterling to near Jordan Valley to near Fleetwood to near Terre 
  Hill, moving northeast at 70 mph.

  This line may contain little or no lightning. Do not wait until 
  you hear thunder before taking cover.

  HAZARD...60 mph wind gusts.

  SOURCE...Radar indicated.

  IMPACT...Damage to roofs, siding, trees, and power lines is 
           possible.

* Locations impacted include...
  Allentown, Easton, Newton, Montague, Bethlehem, Pottstown, Dover,
  Phoenixville, Lansdale, West Norriton, Hopatcong, Forks, East
  Norriton, Emmaus, Northampton, East Stroudsburg, Hackettstown,
  Quakertown, Perkasie and Doylestown.

This includes the following highways...
 Pennsylvania Turnpike between mile markers 342 and 347.
 Northeast Extension between mile markers 23 and 55.
 Interstate 78 in Pennsylvania between mile markers 56 and 76.
 Interstate 78 in New Jersey between mile markers 0 and 25.
 Interstate 80 in Pennsylvania between mile markers 306 and 314.
 Interstate 80 in New Jersey between mile markers 0 and 38.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Protecting yourself from immediate threats to life and safety shall
take priority.  Whenever possible, as long as it does not cause
greater harm, all COVID-19 protective action guidance should be
followed.

For your protection move to an interior room on the lowest floor of a
building.

&&

LAT...LON 4120 7437 4109 7450 4104 7450 4105 7444
      4076 7455 4072 7472 4051 7480 4043 7475
      4034 7494 4016 7504 4014 7551 4024 7565
      4014 7588 4056 7556 4125 7513 4115 7515
      4109 7500 4129 7483 4136 7470
TIME...MOT...LOC 2343Z 237DEG 59KT 4138 7540 4075 7574 4042 7580 4019
7603

HAIL...<.75IN
WIND...60MPH
 
$$

Gorse

1 follow-up statement

470 
WWUS51 KPHI 160020
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
720 PM EST Sun Nov 15 2020

PAC011-160028-
/O.CAN.KPHI.SV.W.0294.000000T0000Z-201116T0100Z/
Berks PA-
720 PM EST Sun Nov 15 2020

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN BERKS COUNTY IS
CANCELLED...

The storms which prompted the warning have moved out of the warned 
area. Therefore, the warning has been cancelled.

A Severe Thunderstorm Watch remains in effect until 1100 PM EST for
central, northern and northwestern New Jersey...and eastern,
southeastern and northeastern Pennsylvania.

LAT...LON 4120 7437 4109 7450 4104 7450 4105 7444
      4076 7455 4072 7472 4051 7480 4043 7475
      4034 7494 4016 7504 4014 7551 4024 7565
      4058 7541 4115 7515 4109 7500 4129 7483
      4136 7470
TIME...MOT...LOC 0018Z 250DEG 50KT 4125 7493 4076 7513 4047 7521 4026
7556

$$

NJC019-027-037-041-PAC017-029-077-089-091-095-160100-
/O.CON.KPHI.SV.W.0294.000000T0000Z-201116T0100Z/
Hunterdon NJ-Morris NJ-Sussex NJ-Warren NJ-Lehigh PA-Montgomery PA-
Bucks PA-Chester PA-Monroe PA-Northampton PA-
720 PM EST Sun Nov 15 2020

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 800 PM EST
FOR HUNTERDON...CENTRAL MORRIS...SUSSEX...WARREN...SOUTHEASTERN
LEHIGH...MONTGOMERY...BUCKS...NORTHEASTERN CHESTER...SOUTHEASTERN
MONROE AND NORTHAMPTON COUNTIES...

At 718 PM EST, intense showers and embedded severe thunderstorms 
were located along a line extending from near Dingmans Ferry to 
Harmony to near Ottsville to near Pottstown, moving east at 60 mph.

This line may contain little or no lightning. Do not wait until you 
hear thunder before taking cover.

HAZARD...60 mph wind gusts.

SOURCE...Radar indicated.

IMPACT...Damage to roofs, siding, trees, and power lines is 
         possible.

Locations impacted include...
Easton, Newton, Montague, Bethlehem, Pottstown, Dover, Phoenixville,
Lansdale, West Norriton, Hopatcong, Forks, East Norriton, East
Stroudsburg, Hackettstown, Quakertown, Perkasie, Doylestown, Byram,
Wilson and Hatboro.

This includes the following highways...
 Pennsylvania Turnpike between mile markers 342 and 347.
 Northeast Extension between mile markers 23 and 48.
 Interstate 78 in Pennsylvania between mile markers 62 and 76.
 Interstate 78 in New Jersey between mile markers 0 and 25.
 Interstate 80 in Pennsylvania between mile markers 309 and 314.
 Interstate 80 in New Jersey between mile markers 0 and 38.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Protecting yourself from immediate threats to life and safety shall
take priority.  Whenever possible, as long as it does not cause
greater harm, all COVID-19 protective action guidance should be
followed.

For your protection move to an interior room on the lowest floor of a
building.

&&

LAT...LON 4120 7437 4109 7450 4104 7450 4105 7444
      4076 7455 4072 7472 4051 7480 4043 7475
      4034 7494 4016 7504 4014 7551 4024 7565
      4058 7541 4115 7515 4109 7500 4129 7483
      4136 7470
TIME...MOT...LOC 0018Z 250DEG 50KT 4125 7493 4076 7513 4047 7521 4026
7556

HAIL...<.75IN
WIND...60MPH
 
$$

Gorse

The office that day

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

Issued	Product	Office	Counties	Lasted
Nov 15, 5:57 PM EST	Severe Thunderstorm Warning	PHI	Berks, Carbon, Lehigh, Monroe, Northampton	78 min
Nov 15, 6:53 PM EST	Severe Thunderstorm Warning	PHI	Chester, Delaware, Montgomery, Philadelphia	67 min

Nearby

Severe Thunderstorm Warnings in Pennsylvania, 2020 Severe Thunderstorm Warnings in New Jersey, 2020 Every severe thunderstorm warning in 2020

Sources

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