Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2020

Severe Thunderstorm Warning 5, NWS Philadelphia/Mount Holly

February 7, 20204 states

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Feb 7, 2020, 9:36 AM EST for 4 states. It was in force for 39 min. 31 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: Feb 7, 2020, 9:36 AM EST (14:36 UTC)
Expired: Feb 7, 2020, 10:15 AM EST
In force: 39 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon
Tornado: Possible
Hail: 0.75 in
Wind: 70.0 mph

Counties New Castle County, DE, Cecil County, MD, Kent County, MD, Gloucester County, NJ, Salem County, NJ, Chester County, PA, Delaware County, PA, Montgomery County, PA, Philadelphia County, PA

The radar

The Dover AFB radar (KDOX), 89 km from the middle of the area, began a volume at 14:38 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
Feb 7, 9:45 AM EST	TSTM WND DMG	1 Sw Marshallton, DE	MULTIPLE TREES DOWN ON TELEGRAPH RD. TIME ESTIMATED FROM RADAR.
Feb 7, 9:45 AM EST	TSTM WND DMG	Eastburn Heights, DE	PHOTO OF A TREE DOWN ONTO A DECK, DESTROYING PART OF A FENCE. TIME ESTIMATED FROM RADAR.
Feb 7, 9:46 AM EST	TSTM WND DMG	2 Ene Kennett Square, PA	DOWNED POWER LINES FROM STRONG WINDS NEAR CANTERBURY DRIVE. TIME ESTIMATED FROM RADAR.
Feb 7, 9:46 AM EST	TSTM WND DMG	2 Wsw Eastburn Heights, DE	DOWNED TREE INTO A HOUSE ON BREWSTER DRIVE. TIME ESTIMATED FROM RADAR.
Feb 7, 9:50 AM EST	TSTM WND DMG	1 Ene Eastburn Heights, DE	DOWNED TREES ON CAR AND RESIDENCES IN MURRAY MANOR. TIME ESTIMATED FROM RADAR.
Feb 7, 9:50 AM EST	TSTM WND DMG	1 W Stanton, DE	SEVERAL REPORTS OF TREES AND WIRES DOWN NEAR TELEGRAPH ROAD, INCLUDING A TREE INTO A HOUSE. TIME ESTIMATED FROM RADAR.
Feb 7, 9:51 AM EST	TSTM WND DMG	1 N East Bradford Twp, PA	DOWNED WIRES NEAR COPELAND SCHOOL ROAD AND KENMARA DRIVE.
Feb 7, 9:52 AM EST	TSTM WND DMG	Westfield, DE	TREE INTO A HOUSE ON REDWOOD AVENUE. TIME ESTIMATED FROM RADAR.
Feb 7, 9:52 AM EST	TSTM WND GST 61	3 Wsw Mount Pleasant, DE
Feb 7, 9:54 AM EST	TSTM WND DMG	1 Ese Tybrook, DE	SEVERAL REPORTS OF DOWNED TREES AND WIRES. TIME ESTIMATED FROM RADAR.
Feb 7, 9:54 AM EST	TSTM WND DMG	1 Ne Birmingham Twp, PA	DOWNED POWER LINES FROM STRONG WINDS NEAR BRIDLEWOOD BOULEVARD. TIME ESTIMATED FROM RADAR.
Feb 7, 9:54 AM EST	TSTM WND DMG	Prices Corner, DE	DOWNED POWER LINES ON CENTERVILLE ROAD.
Feb 7, 10:00 AM EST	TSTM WND GST 59	Shellburne, DE
Feb 7, 10:02 AM EST	TSTM WND DMG	1 Ene Ashbourne Hills, DE	DOWNED TREE BLOCKING INTERSTATE 495 NEAR THE PENNSYLVANIA STATE LINE. TIME ESTIMATED FROM RADAR.
Feb 7, 10:02 AM EST	TSTM WND DMG	1 N Trainer, PA	TREE DOWN ON I-95. TIME ESTIMATED FROM RADAR.
Feb 7, 10:02 AM EST	TSTM WND DMG	Ashbourne Hills, DE	SEVERAL REPORTS OF DOWNED TREES IN THE AREA. TIME ESTIMATED FROM RADAR.
Feb 7, 10:06 AM EST	TSTM WND DMG	1 Nnw Aston Twp., PA	DOWNED TREES CLOSED PENNELL ROAD BETWEEN MOUNT ALVERSON AND GLENDALE. TIME ESTIMATED FROM RADAR.
Feb 7, 10:06 AM EST	TSTM WND DMG	1 W Chester Twp, PA	DOWNED TREE AND WIRES NEAR FORWOOD STREET. TIME ESTIMATED FROM RADAR.
Feb 7, 10:06 AM EST	TSTM WND DMG	Lower Chichester Twp., PA	DOWNED TREES AND WIRES BLOCKING WARD STREET. TIME ESTIMATED FROM RADAR.
Feb 7, 10:06 AM EST	TSTM WND DMG	Lower Chichester Twp., PA	ROOF BLOWN OFF A BUILDING. TIME ESTIMATED FROM RADAR.
Feb 7, 10:07 AM EST	TSTM WND DMG	1 N Broomall, PA	DOWNED UTILITY ON PA-320. TIME ESTIMATED FROM RADAR.
Feb 7, 10:08 AM EST	TSTM WND DMG	1 Nnw Chester Twp, PA	DOWNED TREES AND WIRES NEAR INCINERATOR ROAD. TIME ESTIMATED FROM RADAR.
Feb 7, 10:10 AM EST	TSTM WND DMG	1 W Eddystone, PA	DOWNED TELEPHONE POLE FROM STRONG WINDS. TIME ESTIMATED FROM RADAR.
Feb 7, 10:12 AM EST	TSTM WND DMG	Harrison Twp, NJ	MPING REPORT.
Feb 7, 10:16 AM EST	TSTM WND DMG	1 Ne Sharon Hill, PA	DOWNED TREES ON VEHICLES NEAR POPLAR STREET AND WOODLAND TERRACE. TIME ESTIMATED FROM RADAR.
Feb 7, 10:16 AM EST	TSTM WND DMG	Sharon Hill, PA	DOWNED TREE NEAR ACADEMY PARK HIGH SCHOOL. TIME ESTIMATED FROM RADAR.
Feb 7, 10:17 AM EST	TSTM WND GST 49	Philadelphia Internatio, PA	KPHL ASOS.
Feb 7, 10:18 AM EST	TSTM WND DMG	1 Nnw Philadelphia Inte, PA	DOWNED POWER LINES FROM STRONG WINDS NEAR PROVINCE ISLAND. TIME ESTIMATED FROM RADAR.
Feb 7, 10:18 AM EST	TSTM WND DMG	1 W Horsham Twp, PA	DOWNED TREE NEAR THE INTERSECTION OF CEDAR HILL ROAD AND STONGS LANE. TIME ESTIMATED FROM RADAR.
Feb 7, 10:20 AM EST	TSTM WND DMG	1 Nnw Mantua, NJ	UPROOTED TREE ON THE NEW JERSEY TURNPIKE. TIME ESTIMATED FROM RADAR.
Feb 7, 10:20 AM EST	TSTM WND DMG	1 Nw Mantua, NJ	DOWNED TREE ON NEW JERSEY TURNPIKE SOUTHBOUND NORTH OF INTERCHANGE 2. TIME ESTIMATED FROM RADAR.

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

The nearest sounding before it

Washington/Dulle, VA (KIAD), launched 12:00Z, 2.6 hours before the alert went out and 176 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: 22 J/kg
Mixed-layer CIN: -20 J/kg
Mixed-layer LCL: 491 m above ground
0-6 km bulk shear: 134 kt
0-1 km storm-relative helicity: 488 m²/s²
0-3 km storm-relative helicity: 531 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

523 
WUUS51 KPHI 071436
SVRPHI
DEC003-MDC015-029-NJC015-033-PAC029-045-091-101-071515-
/O.NEW.KPHI.SV.W.0005.200207T1436Z-200207T1515Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mount Holly NJ
936 AM EST Fri Feb 7 2020

The National Weather Service in Mount Holly NJ has issued a

* Severe Thunderstorm Warning for...
  New Castle County in northern Delaware...
  Northeastern Kent County in northeastern Maryland...
  Southeastern Cecil County in northeastern Maryland...
  Salem County in southern New Jersey...
  Northwestern Gloucester County in southern New Jersey...
  Southeastern Montgomery County in southeastern Pennsylvania...
  Southeastern Chester County in southeastern Pennsylvania...
  Philadelphia County in southeastern Pennsylvania...
  Delaware County in southeastern Pennsylvania...

* Until 1015 AM EST.

* At 936 AM EST, severe thunderstorms were located along a line
  extending from Marshallton to Elkton to Kennedyville, moving
  northeast at 50 mph.

  HAZARD...70 mph wind gusts and penny size hail.

  SOURCE...Radar indicated.

  IMPACT...Expect considerable tree damage. Damage is likely to 
           mobile homes, roofs, and outbuildings.

* Locations impacted include...
  Philadelphia, Camden, Wilmington, Newark, Middletown, West Chester,
  Elkton, Norristown, Chester, West Deptford, West Norriton, East
  Norriton, Pennsville, Yeadon, Westtown, Woodbury, Carneys Point,
  Downingtown, Conshohocken and Hatboro.

This includes the following highways...
 Interstate 295 in New Jersey between mile markers 0 and 23.
 Interstate 95 in Pennsylvania between mile markers 0 and 23.
 New Jersey Turnpike between exits 1 and 2.
 Interstate 95 in Delaware between mile markers 0 and 23.
 Interstate 476 in Pennsylvania between mile markers 0 and 19.
 Pennsylvania Turnpike between exits 320 and 343.
 Northeast Extension near exit A20.
 Interstate 676 in Pennsylvania between mile markers 0 and 1.
 Interstate 76 in Pennsylvania between mile markers 327 and 351.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Intense thunderstorm lines can produce brief tornadoes and widespread
significant wind damage. Although a tornado is not immediately
likely, it is best to move to an interior room on the lowest floor of
a building. These storms may cause serious injury and significant
property damage.

&&

LAT...LON 3957 7579 3997 7578 4024 7518 4019 7510
      3992 7513 3950 7532 3946 7537 3945 7542
      3940 7541 3936 7576 3938 7578 3936 7589
      3938 7596
TIME...MOT...LOC 1436Z 243DEG 42KT 3995 7570 3962 7581 3931 7600 

TORNADO...POSSIBLE
HAIL...0.75IN
WIND...70MPH
 
$$

Staarmann

1 follow-up statement

685 
WWUS51 KPHI 071502
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
1002 AM EST Fri Feb 7 2020

MDC015-029-071511-
/O.CAN.KPHI.SV.W.0005.000000T0000Z-200207T1515Z/
Kent MD-Cecil MD-
1002 AM EST Fri Feb 7 2020

...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN KENT AND
SOUTHEASTERN CECIL COUNTIES IS CANCELLED...

The storms which prompted the warning have moved out of the warned 
area. Therefore, the warning has been cancelled, although gusty 
winds will likely persist behind the line.

LAT...LON 3962 7565 4005 7558 4024 7518 4019 7510
      3992 7513 3950 7532 3946 7537 3945 7542
      3940 7541 3938 7577
TIME...MOT...LOC 1501Z 243DEG 42KT 4008 7537 3975 7548 3944 7568 

$$

DEC003-NJC015-033-PAC029-045-091-101-071515-
/O.CON.KPHI.SV.W.0005.000000T0000Z-200207T1515Z/
New Castle DE-Salem NJ-Gloucester NJ-Montgomery PA-Chester PA-
Philadelphia PA-Delaware PA-
1002 AM EST Fri Feb 7 2020

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1015 AM EST
FOR CENTRAL NEW CASTLE...SALEM...NORTHWESTERN GLOUCESTER...
SOUTHEASTERN MONTGOMERY...SOUTHEASTERN CHESTER...PHILADELPHIA AND
DELAWARE COUNTIES...

At 1001 AM EST, severe thunderstorms were located along a line
extending from King Of Prussia to Penns Grove to near Middletown,
moving northeast at 50 mph.

HAZARD...70 mph wind gusts and penny size hail.

SOURCE...Radar indicated.

IMPACT...Expect considerable tree damage. Damage is likely to mobile 
         homes, roofs, and outbuildings.

Locations impacted include...
Philadelphia, Camden, Wilmington, Middletown, West Chester,
Norristown, Chester, West Deptford, West Norriton, East Norriton,
Pennsville, Yeadon, Westtown, Woodbury, Carneys Point, Conshohocken,
Hatboro, Folcroft, Ambler and Swarthmore.

This includes the following highways...
 Interstate 295 in New Jersey between mile markers 0 and 23.
 Interstate 95 in Pennsylvania between mile markers 0 and 23.
 New Jersey Turnpike between exits 1 and 2.
 Interstate 95 in Delaware between mile markers 9 and 23.
 Interstate 476 in Pennsylvania between mile markers 0 and 19.
 Pennsylvania Turnpike between exits 326 and 343.
 Northeast Extension near exit A20.
 Interstate 676 in Pennsylvania between mile markers 0 and 1.
 Interstate 76 in Pennsylvania between mile markers 327 and 351.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Intense thunderstorm lines can produce brief tornadoes and widespread
significant wind damage. Although a tornado is not immediately
likely, it is best to move to an interior room on the lowest floor of
a building. These storms may cause serious injury and significant
property damage.

&&

LAT...LON 3962 7565 4005 7558 4024 7518 4019 7510
      3992 7513 3950 7532 3946 7537 3945 7542
      3940 7541 3938 7577
TIME...MOT...LOC 1501Z 243DEG 42KT 4008 7537 3975 7548 3944 7568 

TORNADO...POSSIBLE
HAIL...0.75IN
WIND...70MPH
 
$$

NC

The office that day

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

Issued	Product	Office	Counties	Lasted
Feb 6, 8:24 PM EST	High Wind Warning	PHI	Sussex	21 hr
Feb 7, 8:03 AM EST	Coastal Flood Advisory	PHI	New Castle	11 hr
Feb 7, 8:18 AM EST	Coastal Flood Statement	PHI	Sussex	11 hr
Feb 7, 8:52 AM EST	Severe Thunderstorm Warning	PHI	New Castle	53 min
Feb 7, 9:24 AM EST	Severe Thunderstorm Warning	PHI	Kent, New Castle, Sussex	66 min
Feb 7, 9:39 AM EST	Tornado Warning	PHI	New Castle	36 min
Feb 6, 8:13 PM EST	Storm Warning	PHI		21 hr
Feb 7, 9:43 AM EST	Severe Thunderstorm Warning	PHI	Hunterdon, Warren	62 min
Feb 7, 10:10 AM EST	Severe Thunderstorm Warning	PHI	Atlantic, Burlington, Camden, Cape May, Cumberland, Gloucester and 2 more	65 min
Feb 7, 10:14 AM EST	Severe Thunderstorm Warning	PHI	Burlington, Camden, Gloucester, Mercer, Middlesex, Monmouth and 3 more	61 min
Feb 7, 10:43 AM EST	Severe Thunderstorm Warning	PHI	Hunterdon, Middlesex, Morris, Somerset, Sussex, Warren	47 min
Feb 7, 11:01 AM EST	Severe Thunderstorm Warning	PHI	Middlesex, Monmouth, Ocean	44 min
Feb 7, 3:27 PM EST	Gale Warning	PHI		9 hr
Feb 7, 6:53 PM EST	Low Water Advisory	PHI		9 hr
Feb 7, 4:00 AM EST	Winter Weather Advisory	PHI	Carbon, Monroe	14 hr
Feb 7, 8:49 AM EST	Severe Thunderstorm Warning	PHI	Caroline, Kent, Queen Anne's, Talbot	56 min
Feb 7, 2:13 PM EST	Coastal Flood Advisory	PHI	Kent	7 hr

Nearby

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