Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2020

Severe Thunderstorm Warning 295, NWS Philadelphia/Mount Holly

November 15, 2020New Castle County, Delaware; Camden County, Gloucester County, Salem County, New Jersey; 4 counties in Pennsylvania

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Nov 15, 2020, 6:53 PM EST for New Castle County, Delaware; Camden County, Gloucester County, Salem County, New Jersey; 4 counties in Pennsylvania. It was in force for 67 min. 26 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, 6:53 PM EST (23:53 UTC)
Expired: Nov 15, 2020, 8:00 PM EST
In force: 67 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

Counties New Castle County, DE, Camden County, NJ, Gloucester County, NJ, Salem County, NJ, Chester County, PA, Delaware County, PA, Montgomery County, PA, Philadelphia County, PA

The radar

The Philadelphia radar (KDIX), 102 km from the middle of the area, began a volume at 23:53 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, 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	2 N Wallace Twp, PA	DOWNED TREE ON LITTLE CONESTOGA ROAD NEAR MAPLEFLOWER ROAD. TIME ESTIMATED FROM RADAR.
Nov 15, 7:18 PM EST	TSTM WND DMG	1 Ese Brandamore, PA	DOWNED TREE NEAR CULBERTSON RUN ROAD. TIME ESTIMATED FROM RADAR.
Nov 15, 7:24 PM EST	TSTM WND DMG	1 Ne Caln Twp, PA	DOWNED TREES AND WIRES NEAR THE ROUTE 30 BYPASS NEAR ROUTE 340 AND BONDSVILLE ROAD. 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	3 Nw East Caln Twp, PA	DOWNED TREE ON LONGFIELDS WAY NEAR DORLAN MILL ROAD. TIME ESTIMATED FROM RADAR.
Nov 15, 7:36 PM EST	TSTM WND DMG	2 S East Whiteland Twp, PA	DOWNED TREE ON FRAZER ROAD NEAR KING ROAD. TIME ESTIMATED FROM RADAR.
Nov 15, 7:40 PM EST	TSTM WND DMG	1 Ene Paoli, PA	DOWNED TREE ON BEARHILL ROAD NEAR EAST CENTRAL AVENUE. TIME ESTIMATED FROM RADAR.
Nov 15, 7:41 PM EST	TSTM WND DMG	1 Nnw Bridgeport, PA	ROOF PARTIALLY BLOWN OFF OF A BUILDING IN NORRISTOWN. TIME ESTIMATED.
Nov 15, 7:44 PM EST	TSTM WND DMG	2 Ese Valley Forge, PA	DOWNED TREE ON RICHARDS ROAD NEAR THOMAS ROAD. TIME ESTIMATED FROM RADAR.
Nov 15, 7:44 PM EST	TSTM WND DMG	2 Ne Berwyn, PA	DOWNED TREE ON BERKSHIRE ROAD NEAR PUGH ROAD. TIME ESTIMATED FROM RADAR.
Nov 15, 7:50 PM EST	TSTM WND DMG	1 E Newtown Square, PA	MPING REPORT OF DOWNED TREE LIMBS AND WIRES. TIME ESTIMATED FROM RADAR.
Nov 15, 7:52 PM EST	TSTM WND DMG	West Conshohocken, PA	SEVERAL REPORTS OF DOWNED TREE LIMBS IN LOWER MERION TWP. TIME ESTIMATED FROM RADAR.
Nov 15, 7:54 PM EST	TSTM WND DMG	Fort Washington, PA	DOWNED TREE AND WIRES ON AMBLER ROAD NEAR ELLERSLIE AVENUE. TIME ESTIMATED FROM RADAR.
Nov 15, 7:54 PM EST	TSTM WND DMG	Green Ridge, PA	MPING REPORT OF TREE LIMBS DOWN. TIME ESTIMATED FROM RADAR.
Nov 15, 7:55 PM EST	TSTM WND DMG	Newark, DE	DOWNED POLES CLOSING FRENCH ROAD NEAR FRAZER ROAD AND PERCH CREEK ROAD IN NEWARK. TIME ESTIMATED FROM RADAR.
Nov 15, 7:58 PM EST	TSTM WND DMG	1 Nne Holiday Hills, DE	NAAMANS ROAD NEAR FOULK ROAD IS CLOSED DUE TO DOWNED WIRES, TIME ESTIMATED FROM RADAR.
Nov 15, 8:00 PM EST	TSTM WND DMG	1 Ene Willow Grove, PA	DOWNED LARGE TREE LIMB BROUGHT WIRES DOWN ONTO TERWOOD ROAD. TIME ESTIMATED FROM RADAR.
Nov 15, 8:00 PM EST	TSTM WND DMG	Willow Grove, PA	SEVERAL TREES DOWN IN THE AREA. TIME ESTIMATED FROM RADAR.
Nov 15, 8:02 PM EST	TSTM WND DMG	1 S Belmont, PA	MPING REPORT OF TREE LIMBS DOWN. TIME ESTIMATED FROM RADAR.
Nov 15, 8:05 PM EST	TSTM WND GST 55	1 W Logan Twp., NJ	LOGAN TWP NJWXNET GAUGE.
Nov 15, 8:05 PM EST	TSTM WND GST 60	Lower Alloways Creek, NJ	NJ WEATHER NET SITE NJ74.
Nov 15, 8:06 PM EST	TSTM WND DMG	1 Ssw Philadelphia, PA	MPING REPORT OF DOWNED TREE LIMBS. TIME ESTIMATED FROM RADAR.
Nov 15, 8:10 PM EST	TSTM WND DMG	Tacony, PA	MPING REPORT OF TREES AND POWER POLES DOWN. TIME ESTIMATED FROM RADAR.
Nov 15, 8:10 PM EST	TSTM WND GST 44	2 Ssw Palmyra, NJ	CORRECTS PREVIOUS TSTM WND GST REPORT FROM 2 SSW PALMYRA. PENNSAUKEN NJWXNET GAUGE.
Nov 15, 8:10 PM EST	TSTM WND GST 61	2 Ssw Palmyra, NJ	PENNSAUKEN 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

Washington/Dulle, VA (KIAD), launched 12:00Z, 11.9 hours before the alert went out and 188 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: 843 m above ground
0-6 km bulk shear: 59 kt
0-1 km storm-relative helicity: 199 m²/s²
0-3 km storm-relative helicity: 356 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

172 
WUUS51 KPHI 152353
SVRPHI
DEC003-NJC007-015-033-PAC029-045-091-101-160100-
/O.NEW.KPHI.SV.W.0295.201115T2353Z-201116T0100Z/

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

The National Weather Service in Mount Holly NJ has issued a

* Severe Thunderstorm Warning for...
  New Castle County in northern Delaware...
  Western Salem County in southern New Jersey...
  Northwestern Camden County in southern New Jersey...
  Northwestern Gloucester County in southern New Jersey...
  Southern Montgomery County in southeastern Pennsylvania...
  Chester County in southeastern Pennsylvania...
  Philadelphia County in southeastern Pennsylvania...
  Delaware County in southeastern Pennsylvania...

* Until 800 PM EST.

* At 652 PM EST, intense showers and some embedded severe 
  thunderstorms were located along a line extending from near 
  Bechtelsville to near Randallstown, moving east at 50 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...
  Philadelphia, Camden, Wilmington, Newark, Middletown, West Chester,
  Gloucester City, Norristown, Chester, Deptford, Pottstown, West
  Deptford, Phoenixville, West Norriton, East Norriton, Pennsville,
  Coatesville, Bellmawr, Yeadon and Westtown.

This includes the following highways...
 New Jersey Turnpike between exits 1 and 2.
 Pennsylvania Turnpike between mile markers 300 and 346.
 Northeast Extension between mile markers 21 and 22.
 Interstate 95 in Pennsylvania between mile markers 0 and 33.
 Interstate 95 in Delaware between mile markers 1 and 23.
 Interstate 76 in Pennsylvania between mile markers 327 and 351.
 Interstate 76 in New Jersey between mile markers 1 and 3.
 Interstate 295 in New Jersey between mile markers 0 and 27.
 Interstate 676 in Pennsylvania between mile markers 0 and 1.
 Interstate 676 in New Jersey between mile markers 0 and 4.
 Interstate 476 in Pennsylvania between mile markers 0 and 19.

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 3976 7606 3983 7604 3987 7599 3995 7600
      4004 7593 4010 7594 4026 7567 4014 7550
      4017 7506 4011 7496 4005 7498 3999 7505
      3999 7503 3998 7502 3943 7544 3941 7577
      3972 7579 3972 7613
TIME...MOT...LOC 2352Z 262DEG 42KT 4035 7571 3937 7686 

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

Gorse

1 follow-up statement

809 
WWUS51 KPHI 160025
SVSPHI

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

DEC003-NJC007-015-033-PAC029-045-091-101-160100-
/O.CON.KPHI.SV.W.0295.000000T0000Z-201116T0100Z/
New Castle DE-Salem NJ-Camden NJ-Gloucester NJ-Montgomery PA-
Chester PA-Philadelphia PA-Delaware PA-
725 PM EST Sun Nov 15 2020

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 800 PM EST
FOR NEW CASTLE...WESTERN SALEM...NORTHWESTERN CAMDEN...NORTHWESTERN
GLOUCESTER...SOUTHERN MONTGOMERY...CHESTER...PHILADELPHIA AND
DELAWARE COUNTIES...

At 724 PM EST, intense showers and some embedded severe 
thunderstorms were located along a line extending from near 
Schwenksville to West Nottingham, moving east at 55 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...Trained weather spotters.

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

Locations impacted include...
Philadelphia, Camden, Wilmington, Newark, Middletown, West Chester,
Gloucester City, Norristown, Chester, Deptford, Pottstown, West
Deptford, Phoenixville, West Norriton, East Norriton, Pennsville,
Coatesville, Bellmawr, Yeadon and Westtown.

This includes the following highways...
 New Jersey Turnpike between exits 1 and 2.
 Pennsylvania Turnpike between mile markers 304 and 346.
 Northeast Extension between mile markers 21 and 23.
 Interstate 95 in Pennsylvania between mile markers 0 and 33.
 Interstate 95 in Delaware between mile markers 1 and 23.
 Interstate 76 in Pennsylvania between mile markers 327 and 351.
 Interstate 76 in New Jersey between mile markers 1 and 3.
 Interstate 295 in New Jersey between mile markers 0 and 27.
 Interstate 676 in Pennsylvania between mile markers 0 and 1.
 Interstate 676 in New Jersey between mile markers 0 and 4.
 Interstate 476 in Pennsylvania between mile markers 0 and 19.

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 3976 7606 3983 7604 3982 7603 4002 7591
      4026 7567 4014 7550 4017 7507 4011 7496
      4005 7498 3999 7506 3998 7502 3943 7544
      3941 7577 3972 7579 3972 7613
TIME...MOT...LOC 0024Z 255DEG 46KT 4023 7549 3966 7608 

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, 6:44 PM EST	Severe Thunderstorm Warning	PHI	Hunterdon, Morris, Sussex, Warren	76 min
Nov 15, 5:57 PM EST	Severe Thunderstorm Warning	PHI	Berks, Carbon, Lehigh, Monroe, Northampton	78 min

Nearby

Severe Thunderstorm Warnings in Pennsylvania, 2020 Severe Thunderstorm Warnings in New Jersey, 2020 Severe Thunderstorm Warnings in Delaware, 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.