Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2019

Severe Thunderstorm Warning 66, NWS Philadelphia/Mount Holly

May 28, 20194 counties in Pennsylvania; Camden County, Gloucester County, Salem County, New Jersey; New Castle County, Delaware

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at May 28, 2019, 6:52 PM EDT for 4 counties in Pennsylvania; Camden County, Gloucester County, Salem County, New Jersey; New Castle County, Delaware. It was in force for 38 min. 6 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, 6:52 PM EDT (22:52 UTC)
Expired: May 28, 2019, 7:30 PM EDT
In force: 38 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon
Hail: 1.0 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), 83 km from the middle of the area, began a volume at 22:51 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, 6:54 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, 7:17 PM EDT	TSTM WND DMG	Dunlinden Acres, DE	TREE INTO A HOUSE ON DUNCAN RD. TIME ESTIMATED FROM RADAR.
May 28, 7:20 PM EDT	HAIL 0.75	Elmhurst, DE
May 28, 7:28 PM EDT	HAIL 1	Carneys Point Twp, NJ	TIME ESTIMATED FROM RADAR.

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, 10.9 hours before the alert went out and 198 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.

742 
WUUS51 KPHI 282252
SVRPHI
DEC003-NJC007-015-033-PAC029-045-091-101-282330-
/O.NEW.KPHI.SV.W.0066.190528T2252Z-190528T2330Z/

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

The National Weather Service in Mount Holly NJ has issued a

* Severe Thunderstorm Warning for...
  Northern New Castle County in northern Delaware...
  Northern Salem County in southern New Jersey...
  Camden County in southern New Jersey...
  Gloucester County in southern New Jersey...
  Southeastern Montgomery County in southeastern Pennsylvania...
  South central Chester County in southeastern Pennsylvania...
  Southwestern Philadelphia County in southeastern Pennsylvania...
  Delaware County in southeastern Pennsylvania...

* Until 730 PM EDT.

* At 651 PM EDT, severe thunderstorms were located along a line
  extending from Bryn Mawr to Arden to Ashland to near Oxford, moving
  southeast 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...
  Philadelphia, Camden, Wilmington, Gloucester City, Cherry Hill,
  Chester, Deptford, Voorhees, West Deptford, Glassboro, Lindenwold,
  Pennsville, Bellmawr, Yeadon, Woodbury, Pitman, Clayton, Carneys
  Point, Berlin and Folcroft.

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.

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

&&

LAT...LON 3979 7584 3983 7575 3986 7558 4007 7532
      3987 7493 3978 7489 3979 7483 3975 7477
      3953 7499 3956 7505 3968 7551 3971 7549
      3972 7551 3969 7554 3975 7581
TIME...MOT...LOC 2251Z 300DEG 38KT 4002 7529 3983 7551 3980 7568 3982
7594

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

Gorse

1 follow-up statement

670 
WWUS51 KPHI 282310
SVSPHI

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

PAC029-282319-
/O.CAN.KPHI.SV.W.0066.000000T0000Z-190528T2330Z/
Chester PA-
710 PM EDT Tue May 28 2019

...THE SEVERE THUNDERSTORM WARNING FOR SOUTH CENTRAL CHESTER 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 3979 7570 3987 7547 4003 7525 3986 7493
      3978 7489 3978 7488 3977 7488 3978 7482
      3975 7477 3953 7499 3956 7505 3968 7550
      3970 7548 3971 7549 3972 7551 3969 7554
      3973 7573 3974 7576 3977 7574
TIME...MOT...LOC 2309Z 299DEG 38KT 3994 7515 3974 7532 3972 7549 3976
7575

$$

DEC003-NJC007-015-033-PAC045-091-101-282330-
/O.CON.KPHI.SV.W.0066.000000T0000Z-190528T2330Z/
New Castle DE-Salem NJ-Camden NJ-Gloucester NJ-Montgomery PA-
Philadelphia PA-Delaware PA-
710 PM EDT Tue May 28 2019

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 730 PM EDT
FOR NORTHERN NEW CASTLE...NORTHERN SALEM...CAMDEN...GLOUCESTER...
SOUTHEASTERN MONTGOMERY...SOUTHWESTERN PHILADELPHIA AND SOUTHERN
DELAWARE COUNTIES...

At 709 PM EDT, severe thunderstorms were located along a line
extending from Ben Franklin Bridge to Swedesboro to Carneys Point to
North Star, moving southeast 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...
Philadelphia, Camden, Wilmington, Gloucester City, Chester, Deptford,
Voorhees, West Deptford, Glassboro, Lindenwold, Pennsville, Bellmawr,
Yeadon, Woodbury, Pitman, Clayton, Carneys Point, Berlin, Folcroft
and Swarthmore.

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 3979 7570 3987 7547 4003 7525 3986 7493
      3978 7489 3978 7488 3977 7488 3978 7482
      3975 7477 3953 7499 3956 7505 3968 7550
      3970 7548 3971 7549 3972 7551 3969 7554
      3973 7573 3974 7576 3977 7574
TIME...MOT...LOC 2309Z 299DEG 38KT 3994 7515 3974 7532 3972 7549 3976
7575

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

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, 6:24 PM EDT	Severe Thunderstorm Warning	PHI	Berks, Chester, Delaware	48 min
May 28, 6:41 PM EDT	Severe Thunderstorm Warning	PHI	Monroe	64 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, 9:17 AM EDT	Special Marine Warning	PHI		58 min
May 28, 9:31 AM EDT	Special Weather Statement	PHI	Cape May	44 min
May 28, 6:04 PM EDT	Special Weather Statement	PHI	Salem	41 min
May 28, 6:13 PM EDT	Special Marine Warning	PHI		62 min
May 28, 6:59 PM EDT	Severe Thunderstorm Warning	PHI	Atlantic, Cumberland, Gloucester, Salem	61 min
May 28, 7:20 PM EDT	Severe Thunderstorm Warning	PHI	Cumberland, Salem	40 min
May 28, 7:39 PM EDT	Severe Thunderstorm Warning	PHI	Morris, Sussex, Warren	66 min
May 28, 7:53 PM EDT	Severe Thunderstorm Warning	PHI	Cape May, Cumberland, Salem	52 min
May 28, 7:55 PM EDT	Areal Flood Advisory	PHI	Cumberland, Salem	2 hr
May 28, 7:59 PM EDT	Tornado Warning	PHI	Cumberland	31 min
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

Nearby

Severe Thunderstorm Warnings in Pennsylvania, 2019 Severe Thunderstorm Warnings in New Jersey, 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.