Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2019

Severe Thunderstorm Warning 64, NWS Philadelphia/Mount Holly

May 28, 2019Berks County, Chester County, Delaware County, Pennsylvania; New Castle County, Delaware

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at May 28, 2019, 6:24 PM EDT for Berks County, Chester County, Delaware County, Pennsylvania; New Castle County, Delaware. It was in force for 48 min. 16 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: May 28, 2019, 6:24 PM EDT (22:24 UTC)
Expired: May 28, 2019, 7:12 PM EDT
In force: 48 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon
Hail: 1.25 in
Wind: 60.0 mph

Counties New Castle County, DE, Berks County, PA, Chester County, PA, Delaware County, PA

The radar

The Philadelphia radar (KDIX), 121 km from the middle of the area, began a volume at 22:25 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
May 28, 6:25 PM EDT	TSTM WND DMG	1 Nnw West Chester, PA	TREE DOWN AT OWEN ROAD AND KIRBY DRIVE IN WEST GOSHEN TWP. ALL LANES CLOSED. TIME ESTIMATED FROM RADAR.
May 28, 6:28 PM EDT	TSTM WND DMG	1 Wnw Downington, PA	DOWNED TREE BLOCKING THE SOUTHBOUND LANE OF ROCK RAYMOND DRIVE NEAR THE U.S. 30 BYPASS. TIME ESTIMATED FROM RADAR.
May 28, 6:28 PM EDT	HAIL 1	1 N West Chester, PA
May 28, 6:30 PM EDT	HAIL 1	Exton, PA
May 28, 6:33 PM EDT	TSTM WND DMG	1 Nne South Coatesville, PA	LARGE TREE BLOWN DOWN NEAR THE INTERSECTION OF FOUNDRY ROAD AND FOUNDRY STREET IN CALN TWP. TIME ESTIMATED FROM RADAR.
May 28, 6:35 PM EDT	TSTM WND DMG	1 Se Exton, PA	CORRECTS PREVIOUS TSTM WND DMG REPORT FROM 1 SE EXTON. TREE DOWN ON PA-100.
May 28, 6:35 PM EDT	TSTM WND DMG	1 Se Exton, PA	TREE DOWN ON PA-100.
May 28, 6:36 PM EDT	TSTM WND DMG	1 Wsw East Fallowfield, PA	LARGE TREE DOWN BLOCKING ALL OF BUCK RUN ROAD NEAR GLENROSE ROAD. TIME ESTIMATED FROM RADAR.
May 28, 6:38 PM EDT	TSTM WND DMG	1 W East Goshen Twp., PA	TREE DOWN BLOCKING MEADOWBROOK LANE NEAR BOOT ROAD. TIME ESTIMATED FROM RADAR.
May 28, 6:41 PM EDT	TSTM WND DMG	1 Sse Paoli, PA	DOWNED TREE ON WEATHERSTONE DRIVE NEAR VALLEY ROAD IN WILLISTOWN TWP. TIME ESTIMATED FROM RADAR.
May 28, 6:44 PM EDT	HAIL 0.7	1 Nne West Goshen, PA
May 28, 6:49 PM EDT	TSTM WND DMG	1 Ssw East Goshen Twp., PA	TREE DOWN BLOCKING BARKER DRIVE AT MARYDELL DRIVE. TIME ESTIMATED FROM RADAR.
May 28, 6:54 PM EDT	TSTM WND DMG	3 Ese Kennett Square, PA	LARGE TREE DOWN DAMAGING TWO VEHICLES NEAR THE INTERSECTION OF NINE GATES ROAD AND OLD KENNETT ROAD IN KENNETT TWP. TIME ESTIMATED FROM RADAR.
May 28, 7:02 PM EDT	TSTM WND DMG	Claymont, DE	* 1 INJ * A TREE FELL ONTO A TENT AT A CHURCH FESTIVAL. THE TREE STRUCK AND INJURED A MUSICIAN PLAYING INSIDE THE TENT AT THE TIME. TIME ESTIMATED FROM RADAR.
May 28, 7:15 PM EDT	HAIL 0.7	Cleland Heights, DE
May 28, 7:18 PM EDT	TSTM WND DMG	1 Se Exton, PA	TREE DOWN ON PA-100.

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
May 28, 1:48 PM EDT	Tornado Watch	SPC	8 hr

The nearest sounding before it

Washington/Dulle, VA (KIAD), launched 12:00Z, 10.4 hours before the alert went out and 177 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: 35 J/kg
Mixed-layer CIN: -149 J/kg
Mixed-layer LCL: 1167 m above ground
0-6 km bulk shear: 31 kt
0-1 km storm-relative helicity: 293 m²/s²
0-3 km storm-relative helicity: 414 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.1

Open this sounding in Storm Lab

The text

As transmitted.

002 
WUUS51 KPHI 282224
SVRPHI
DEC003-PAC011-029-045-282330-
/O.NEW.KPHI.SV.W.0064.190528T2224Z-190528T2330Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mount Holly NJ
624 PM EDT Tue May 28 2019

The National Weather Service in Mount Holly NJ has issued a

* Severe Thunderstorm Warning for...
  Northeastern New Castle County in northern Delaware...
  Southern Berks County in eastern Pennsylvania...
  Chester County in southeastern Pennsylvania...
  Delaware County in southeastern Pennsylvania...

* Until 730 PM EDT.

* At 622 PM EDT, a cluster of severe thunderstorms were across 
  Chester County to Lancaster County, moving east at 45 mph.

  HAZARD...60 mph wind gusts and half dollar size hail.

  SOURCE...Radar indicated.

  IMPACT...Minor damage to vehicles is possible. Wind damage to 
           roofs, siding, trees, and power lines is possible.

These storms have had a history of producing large hail.

* Locations impacted include...
  Wilmington, West Chester, Chester, Coatesville, Westtown, Carneys
  Point, Downingtown, Swarthmore, Elsmere, Kennett Square,
  Parkesburg, West Grove, Honey Brook, Elverson, Arden, New Morgan,
  Cheyney, Talleyville, Elam and Bryn Mawr.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A tornado watch remains in effect until 1000 PM EDT for northern
Delaware...southern New Jersey...and eastern and southeastern
Pennsylvania.

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

In addition to large hail and damaging winds, frequent cloud to
ground lightning is occurring with this storm. Move indoors
immediately. Remember, if you can hear thunder, you are close enough
to be struck by lightning.

&&

LAT...LON 3987 7599 3992 7600 3994 7598 3995 7600
      4004 7593 4011 7594 4014 7588 4019 7595
      4022 7592 4005 7534 3996 7526 3971 7550
      3986 7601
TIME...MOT...LOC 2222Z 288DEG 38KT 4002 7592 

HAIL...1.25IN
WIND...60MPH
 
$$

Gorse

3 follow-up statements

873 
WWUS51 KPHI 282243
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
643 PM EDT Tue May 28 2019

PAC011-282253-
/O.CAN.KPHI.SV.W.0064.000000T0000Z-190528T2330Z/
Berks PA-
643 PM EDT Tue May 28 2019

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

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

A tornado watch remains in effect until 1000 PM EDT for northern
Delaware...southern New Jersey...and southeastern Pennsylvania.

LAT...LON 3987 7599 3992 7600 3994 7598 3995 7600
      4000 7591 4008 7555 4005 7534 3996 7526
      3971 7550 3986 7601
TIME...MOT...LOC 2243Z 303DEG 42KT 4001 7542 3990 7561 3984 7579 3986
7603

$$

DEC003-PAC029-045-282330-
/O.CON.KPHI.SV.W.0064.000000T0000Z-190528T2330Z/
New Castle DE-Chester PA-Delaware PA-
643 PM EDT Tue May 28 2019

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 730 PM EDT
FOR NORTHEASTERN NEW CASTLE...CENTRAL CHESTER AND DELAWARE
COUNTIES...

At 643 PM EDT, severe thunderstorms were located along a line
extending from near Newtown Square to near Westtown to near West
Grove to near Homeville, moving southeast at 50 mph.

HAZARD...60 mph wind gusts and quarter size hail.

SOURCE...Radar indicated.

IMPACT...Minor damage to vehicles is possible. Wind damage to roofs, 
         siding, trees, and power lines is possible.

Locations impacted include...
Wilmington, West Chester, Chester, Coatesville, Westtown, Carneys
Point, Downingtown, Swarthmore, Elsmere, Kennett Square, Parkesburg,
West Grove, Arden, Cheyney, Talleyville, Elam, Bryn Mawr,
Marshallton, Trout Lake and Chelsea.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A tornado watch remains in effect until 1000 PM EDT for northern
Delaware...southern New Jersey...and southeastern Pennsylvania.

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

Frequent cloud to ground lightning is occurring with these storms.
Move indoors immediately. Lightning is one of nature's leading
killers. Remember, if you can hear thunder, you are close enough to
be struck by lightning.

&&

LAT...LON 3987 7599 3992 7600 3994 7598 3995 7600
      4000 7591 4008 7555 4005 7534 3996 7526
      3971 7550 3986 7601
TIME...MOT...LOC 2243Z 303DEG 42KT 4001 7542 3990 7561 3984 7579 3986
7603

HAIL...1.00IN
WIND...60MPH
 
$$

Gorse

164 
WWUS51 KPHI 282254
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
654 PM EDT Tue May 28 2019

DEC003-PAC029-045-282330-
/O.CON.KPHI.SV.W.0064.000000T0000Z-190528T2330Z/
New Castle DE-Chester PA-Delaware PA-
654 PM EDT Tue May 28 2019

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 730 PM EDT
FOR NORTHEASTERN NEW CASTLE...SOUTHEASTERN CHESTER AND DELAWARE
COUNTIES...

At 653 PM EDT, severe thunderstorms were located along a line
extending from Drexel Hill to Chelsea to Hockessin to near Oxford,
moving east at 45 mph.

HAZARD...60 mph wind gusts and quarter size hail.

SOURCE...Radar indicated.

IMPACT...Minor damage to vehicles is possible. Wind damage to roofs, 
         siding, trees, and power lines is possible.

Locations impacted include...
Wilmington, West Chester, Chester, Westtown, Carneys Point,
Swarthmore, Elsmere, Kennett Square, West Grove, Arden, Cheyney,
Talleyville, Elam, Bryn Mawr, Trout Lake, Chelsea, Radnor Township,
Gradyville, Greenville and Broomall.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A tornado watch remains in effect until 1000 PM EDT for northern
Delaware...southern New Jersey...and southeastern Pennsylvania.

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

Frequent cloud to ground lightning is occurring with these storms.
Move indoors immediately. Lightning is one of nature's leading
killers. Remember, if you can hear thunder, you are close enough to
be struck by lightning.

&&

LAT...LON 3995 7567 4005 7534 3996 7526 3971 7550
      3984 7595
TIME...MOT...LOC 2253Z 291DEG 39KT 3996 7530 3985 7549 3979 7567 3981
7591

HAIL...1.00IN
WIND...60MPH
 
$$

Gorse

764 
WWUS51 KPHI 282312
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
712 PM EDT Tue May 28 2019

DEC003-PAC029-045-282321-
/O.CAN.KPHI.SV.W.0064.000000T0000Z-190528T2330Z/
New Castle DE-Chester PA-Delaware PA-
712 PM EDT Tue May 28 2019

...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN NEW CASTLE...
SOUTHEASTERN CHESTER AND DELAWARE COUNTIES IS CANCELLED...
    
The storms which prompted the warning have moved out of Chester 
County and will move out of the other counties shortly. This warning 
has been cancelled, however another Severe Thunderstorm Warning 
remains in effect for New Castle and Delaware counties.

A tornado watch remains in effect until 1000 PM EDT for northern
Delaware...southern New Jersey...and southeastern Pennsylvania.

LAT...LON 3995 7567 4005 7534 3996 7526 3971 7550
      3984 7595
TIME...MOT...LOC 2309Z 288DEG 38KT 3991 7508 3980 7528 3974 7546 3976
7569

$$

Gorse

The office that day

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

Issued	Product	Office	Counties	Lasted
May 28, 4:27 PM EDT	Severe Thunderstorm Warning	PHI	Berks	63 min
May 28, 4:56 PM EDT	Special Weather Statement	PHI	Chester	49 min
May 28, 5:08 PM EDT	Severe Thunderstorm Warning	PHI	Berks	67 min
May 28, 5:22 PM EDT	Tornado Warning	PHI	Berks	23 min
May 28, 5:36 PM EDT	Severe Thunderstorm Warning	PHI	Berks	39 min
May 28, 5:45 PM EDT	Severe Thunderstorm Warning	PHI	Berks, Chester	45 min
May 28, 6:03 PM EDT	Areal Flood Advisory	PHI	Berks	2 hr
May 28, 6:09 PM EDT	Tornado Warning	PHI	Chester	36 min
May 28, 6:11 PM EDT	Severe Thunderstorm Warning	PHI	Chester	64 min
May 28, 6:14 PM EDT	Areal Flood Advisory	PHI	Chester	4 hr
May 28, 6:16 PM EDT	Severe Thunderstorm Warning	PHI	Berks, Bucks, Lehigh, Montgomery	44 min
May 28, 6:41 PM EDT	Severe Thunderstorm Warning	PHI	Monroe	64 min
May 28, 6:52 PM EDT	Severe Thunderstorm Warning	PHI	Chester, Delaware, Montgomery, Philadelphia	38 min
May 28, 7:00 PM EDT	Areal Flood Advisory	PHI	Delaware, Philadelphia	3 hr
May 28, 7:42 PM EDT	Severe Thunderstorm Warning	PHI	Monroe	63 min
May 28, 7:59 PM EDT	Areal Flood Advisory	PHI	Monroe	2 hr
May 28, 8:28 AM EDT	Severe Thunderstorm Warning	PHI	Kent, Sussex	47 min
May 28, 9:13 AM EDT	Severe Thunderstorm Warning	PHI	Kent, Sussex	47 min
May 28, 5:14 PM EDT	Severe Thunderstorm Warning	PHI	New Castle	46 min
May 28, 6:04 PM EDT	Special Weather Statement	PHI	New Castle	41 min
May 28, 7:20 PM EDT	Severe Thunderstorm Warning	PHI	New Castle	40 min

Nearby

Severe Thunderstorm Warnings in Pennsylvania, 2019 Severe Thunderstorm Warnings in Delaware, 2019 Every severe thunderstorm warning in 2019

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.