Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2020

Severe Thunderstorm Warning 3, NWS Philadelphia/Mount Holly

February 7, 20204 counties in Pennsylvania; New Castle County, Delaware; Cecil County, Kent County, Maryland

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Feb 7, 2020, 8:52 AM EST for 4 counties in Pennsylvania; New Castle County, Delaware; Cecil County, Kent County, Maryland. It was in force for 53 min. 25 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, 8:52 AM EST (13:52 UTC)
Expired: Feb 7, 2020, 9:45 AM EST
In force: 53 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon
Hail: 0.75 in
Wind: 70.0 mph

Counties New Castle County, DE, Cecil County, MD, Kent County, MD, Berks County, PA, Chester County, PA, Delaware County, PA, Montgomery County, PA

The radar

The Dover AFB radar (KDOX), 123 km from the middle of the area, began a volume at 13:55 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, 9:06 AM EST	TSTM WND DMG	1 W Willowdale, PA	DOWNED TREE ON WIRES NEAR THE INTERSECTION OF WOLLASTON ROAD AND STREET ROAD. STRONG GUSTS WELL IN ADVANCE OF PRECIPITATION.
Feb 7, 9:12 AM EST	TSTM WND DMG	2 S Kennett Square, PA	DOWNED TREE NEAR THE INTERSECTION OF KAOLIN ROAD AND ROUND HILL ROAD. STRONG WINDS WELL IN ADVANCE OF PRECIPITATION.
Feb 7, 9:22 AM EST	TSTM WND DMG	1 Nne Brandamore, PA	SEVERAL POWER LINES DOWN NEAR MANOR ROAD AND HORSESHOE PIKE. STRONG WINDS WELL IN ADVANCE OF PRECIPITATION.
Feb 7, 9:23 AM EST	TSTM WND DMG	2 Se Port Deposit, MD	WIND BLOWN DEBRIS IN THE ROAD ON I-95 NORTH OF EXIT 93. TIME ESTIMATED FROM RADAR.
Feb 7, 9:26 AM EST	TSTM WND DMG	2 Sw Spring Twp, PA	DOWNED TREE ON WIRES. TIME ESTIMATED FROM RADAR.
Feb 7, 9:26 AM EST	TSTM WND DMG	Bern Twp, PA	VIDEO AND PHOTOS SHOW GUSTY WINDS WITH A PORTION OF A WAREHOUSE EXTERIOR WALL PUSHED INWARD.
Feb 7, 9:28 AM EST	TSTM WND DMG	1 Se Lincoln University, PA	DOWNED POWER LINES FROM STRONG WINDS NEAR ELKDALE ROAD. TIME ESTIMATED FROM RADAR.
Feb 7, 9:30 AM EST	TSTM WND DMG	1 Nnw Highland Twp., PA	DOWNED TREE AND WIRES NEAR THE INTERSECTION OF FIVE POINTS ROAD AND GLENROSE ROAD. TIME ESTIMATED FROM RADAR.
Feb 7, 9:30 AM EST	TSTM WND DMG	Spring Twp, PA	SEVERAL TREES AND POWER LINES DOWN.
Feb 7, 9:32 AM EST	TSTM WND DMG	Lorane, PA	DOWNED TREE BLOCKING THE ROAD NEAR THE INTERSECTION OF LORANE ROAD AND AHRENS ROAD. TIME ESTIMATED FROM RADAR.
Feb 7, 9:39 AM EST	TORNADO	1 Ssw Barksdale, MD	AN EF-1 TORNADO BRIEFLY TOUCHED DOWN NEAR THE ELK MILLS QUARRY IN CECIL COUNTY, MARYLAND. THE TORNADO UPROOTED AND SNAPPED NUMEROUS SOFTWOOD TREES JUST EAST AND NORTH OF THE QUARRY NEAR THE INTERSECTION OF ELK MILLS ROAD, APPLETON ROAD, AND FLETCHWOOD ROAD. A
Feb 7, 9:40 AM EST	TSTM WND DMG	Barksdale, MD	SEVERAL REPORTS OF DOWNED TREES. TIME ESTIMATED FROM RADAR.
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, 9:50 AM EST	TSTM WND DMG	Pughtown, PA	SEVERAL REPORTS OF TREES AND POWER LINES DOWN NEAR PUGHTOWN, ROYERSFORD, PHOENIXVILLE, AND ST. PETERS. 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.

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, 1.9 hours before the alert went out and 159 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.

670 
WUUS51 KPHI 071352
SVRPHI
DEC003-MDC015-029-PAC011-029-045-091-071445-
/O.NEW.KPHI.SV.W.0003.200207T1352Z-200207T1445Z/

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

The National Weather Service in Mount Holly NJ has issued a

* Severe Thunderstorm Warning for...
  Western New Castle County in northern Delaware...
  Northeastern Kent County in northeastern Maryland...
  Cecil County in northeastern Maryland...
  Eastern Berks County in eastern Pennsylvania...
  Northwestern Montgomery County in southeastern Pennsylvania...
  Chester County in southeastern Pennsylvania...
  West central Delaware County in southeastern Pennsylvania...

* Until 945 AM EST.

* At 851 AM EST, severe thunderstorms were located along a line
  extending from Mountville to Delta to Essex, moving northeast at 
  60 mph. This storm has a history of producing wind damage across 
  portions of Maryland.

  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...
  Reading, Wilmington, Newark, Middletown, West Chester, Elkton,
  Calvert, Pottstown, Phoenixville, Coatesville, Westtown,
  Wyomissing, Downingtown, Elsmere, Kennett Square, Birdsboro,
  Collegeville, Oxford, Kutztown and Royersford.

This includes the following highways...
 Interstate 78 in Pennsylvania between mile markers 43 and 44.
 Interstate 95 in Maryland between mile markers 91 and 109.
 Interstate 95 in Delaware between mile markers 0 and 11.
 Pennsylvania Turnpike between exits 298 and 320.
 Interstate 176 in Pennsylvania between mile markers 1 and 11.

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 3973 7610 3976 7606 3987 7599 3995 7600
      4004 7593 4011 7594 4014 7588 4031 7615
      4059 7576 4034 7536 3937 7571 3931 7618
      3942 7600 3952 7598 3955 7608 3972 7623
TIME...MOT...LOC 1351Z 228DEG 52KT 4005 7640 3973 7633 3931 7647 

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

Staarmann

2 follow-up statements

694 
WWUS51 KPHI 071422
SVSPHI

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

DEC003-MDC015-029-PAC011-029-045-091-071445-
/O.CON.KPHI.SV.W.0003.000000T0000Z-200207T1445Z/
New Castle DE-Kent MD-Cecil MD-Berks PA-Montgomery PA-Chester PA-
Delaware PA-
922 AM EST Fri Feb 7 2020

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 945 AM EST
FOR WESTERN NEW CASTLE...NORTHEASTERN KENT...CECIL...EASTERN BERKS...
NORTHWESTERN MONTGOMERY...CHESTER AND WEST CENTRAL DELAWARE
COUNTIES...

At 920 AM EST, severe thunderstorms were located along a line
extending from Reading to near Parkesburg to near Aberdeen Proving 
Ground, moving northeast at 65 mph. Numerous trees have been 
reported down along with numerous power outages due to high winds 
along and ahead of this line of storms.

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...
Reading, Wilmington, Newark, Middletown, West Chester, Elkton,
Calvert, Pottstown, Phoenixville, Coatesville, Westtown, Wyomissing,
Downingtown, Elsmere, Kennett Square, Birdsboro, Collegeville,
Oxford, Kutztown and Royersford.

This includes the following highways...
 Interstate 78 in Pennsylvania between mile markers 43 and 44.
 Interstate 95 in Maryland between mile markers 91 and 109.
 Interstate 95 in Delaware between mile markers 0 and 11.
 Pennsylvania Turnpike between exits 298 and 320.
 Interstate 176 in Pennsylvania between mile markers 1 and 11.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Wind damage with these storms will occur before any rain or
lightning. Do not wait for the sound of thunder before taking cover.
SEEK SHELTER IMMEDIATELY inside a sturdy structure and stay away from
windows.

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 3973 7610 3976 7606 3987 7599 3995 7600
      4004 7593 4011 7594 4014 7588 4031 7615
      4059 7576 4034 7536 3937 7571 3931 7618
      3942 7600 3952 7598 3955 7608 3972 7623
TIME...MOT...LOC 1420Z 238DEG 55KT 4031 7592 3994 7588 3947 7605 

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

Staarmann

356 
WWUS51 KPHI 071446
SVSPHI

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

DEC003-MDC015-029-PAC011-029-045-091-071455-
/O.EXP.KPHI.SV.W.0003.000000T0000Z-200207T1445Z/
New Castle DE-Kent MD-Cecil MD-Berks PA-Montgomery PA-Chester PA-
Delaware PA-
946 AM EST Fri Feb 7 2020

...THE SEVERE THUNDERSTORM WARNING FOR WESTERN NEW CASTLE...
NORTHEASTERN KENT...CECIL...EASTERN BERKS...NORTHWESTERN
MONTGOMERY...CHESTER AND WEST CENTRAL DELAWARE COUNTIES HAS
EXPIRED...
    
The storms which prompted the warning have moved out of the area.
Therefore, the warning has been allowed to expire.  However gusty 
winds are still possible with these thunderstorms. Severe 
thunderstorm warnings remain in effect for eastern portions of the 
warning

LAT...LON 3973 7610 3976 7606 3987 7599 3995 7600
      4004 7593 4011 7594 4014 7588 4031 7615
      4059 7576 4034 7536 3937 7571 3931 7618
      3942 7600 3952 7598 3955 7608 3972 7623
TIME...MOT...LOC 1445Z 228DEG 52KT 4055 7557 4018 7553 3971 7570 

$$

NC

The office that day

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

Issued	Product	Office	Counties	Lasted
Feb 7, 4:00 AM EST	Winter Weather Advisory	PHI	Carbon, Monroe	14 hr
Feb 7, 8:03 AM EST	Coastal Flood Advisory	PHI	Bucks, Delaware, Philadelphia	11 hr
Feb 7, 9:36 AM EST	Severe Thunderstorm Warning	PHI	Chester, Delaware, Montgomery, Philadelphia	39 min
Feb 7, 9:39 AM EST	Tornado Warning	PHI	Chester, Delaware	36 min
Feb 7, 9:43 AM EST	Severe Thunderstorm Warning	PHI	Berks, Bucks, Chester, Lehigh, Montgomery, Northampton	62 min
Feb 7, 10:14 AM EST	Severe Thunderstorm Warning	PHI	Bucks, Montgomery, Philadelphia	61 min
Feb 6, 8:24 PM EST	High Wind Warning	PHI	Sussex	21 hr
Feb 7, 8:18 AM EST	Coastal Flood Statement	PHI	Sussex	11 hr
Feb 7, 9:24 AM EST	Severe Thunderstorm Warning	PHI	Kent, New Castle, Sussex	66 min
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 Maryland, 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.