Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2019

Severe Thunderstorm Warning 112, NWS Philadelphia/Mount Holly

June 2, 2019Chester County, Delaware County, Pennsylvania; New Castle County, Delaware

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Jun 2, 2019, 2:40 PM EDT for Chester County, Delaware County, Pennsylvania; New Castle County, Delaware. It was in force for 50 min. 10 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: Jun 2, 2019, 2:40 PM EDT (18:40 UTC)
Expired: Jun 2, 2019, 3:30 PM EDT
In force: 50 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

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

The radar

The Philadelphia radar (KDIX), 95 km from the middle of the area, began a volume at 18:41 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
Jun 2, 2:46 PM EDT	HAIL 0.25	2 E Willowdale, PA	MPING REPORT.
Jun 2, 2:47 PM EDT	HAIL 0.25	Kennett Square, PA
Jun 2, 3:03 PM EDT	HAIL 0.75	Thornbury Twp, PA
Jun 2, 3:10 PM EDT	HAIL 0.75	Augustine, DE	UP TO PEA SIZED HAIL REPORTED IN NORTH WILMINGTON.
Jun 2, 3:13 PM EDT	HAIL 0.75	1 N Newlin Twp, PA	MPING REPORT.
Jun 2, 3:19 PM EDT	HAIL 1	Glen Mills, PA
Jun 2, 3:21 PM EDT	HAIL 1	Pocopson Twp, PA	TIME ESTIMATED FROM RADAR.
Jun 2, 3:30 PM EDT	HAIL 0.75	West Chester, PA
Jun 2, 3:35 PM EDT	HAIL 0.25	2 Ssw Cheyney, PA	MPING REPORT.
Jun 2, 3:37 PM EDT	HAIL 0.75	Glen Mills, PA	DIME TO PENNY SIZE HAIL REPORTED IN GLEN MILLS.

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, 6.7 hours before the alert went out and 191 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: 1413 m above ground
0-6 km bulk shear: 11 kt
0-1 km storm-relative helicity: 64 m²/s²
0-3 km storm-relative helicity: 94 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

916 
WUUS51 KPHI 021840
SVRPHI
DEC003-PAC029-045-021930-
/O.NEW.KPHI.SV.W.0112.190602T1840Z-190602T1930Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mount Holly NJ
240 PM EDT Sun Jun 2 2019

The National Weather Service in Mount Holly NJ has issued a

* Severe Thunderstorm Warning for...
  Northern New Castle County in northern Delaware...
  Southeastern Chester County in southeastern Pennsylvania...
  Southwestern Delaware County in southeastern Pennsylvania...

* Until 330 PM EDT.

* At 239 PM EDT, a severe thunderstorm was located over Kennett
  Square, or 10 miles southwest of West Chester, moving northeast at
  25 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, Kennett Square, Arden,
  Cheyney, North Star, Talleyville, Elam, Marshallton, Lima, Pike
  Creek, Chelsea, Ashland, Gradyville, Greenville, Paoli, Chester
  Township and Ladenberg.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4007 7549 3985 7534 3981 7540 3979 7541
      3978 7544 3972 7576 3989 7585
TIME...MOT...LOC 1839Z 246DEG 22KT 3984 7572 

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

Davis

1 follow-up statement

198 
WWUS51 KPHI 021852
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
252 PM EDT Sun Jun 2 2019

DEC003-PAC029-045-021930-
/O.CON.KPHI.SV.W.0112.000000T0000Z-190602T1930Z/
New Castle DE-Chester PA-Delaware PA-
252 PM EDT Sun Jun 2 2019

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 330 PM EDT
FOR NORTHEASTERN NEW CASTLE...SOUTHEASTERN CHESTER AND SOUTHWESTERN
DELAWARE COUNTIES...

At 252 PM EDT, a severe thunderstorm was located near Elam, or near
West Chester, moving northeast at 25 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, Kennett Square, Arden,
Cheyney, Talleyville, Elam, Marshallton, Lima, Chelsea, Ashland,
Gradyville, Greenville, Paoli, Chester Township, Concordville,
Hockessin and Nether Providence Township.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4007 7549 3985 7534 3981 7540 3979 7541
      3978 7544 3973 7569 3992 7576
TIME...MOT...LOC 1852Z 246DEG 22KT 3987 7562 

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

Davis

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 2, 2:32 PM EDT	Special Weather Statement	PHI	Delaware	28 min
Jun 2, 3:15 PM EDT	Special Weather Statement	PHI	Philadelphia	30 min
Jun 2, 3:18 PM EDT	Severe Thunderstorm Warning	PHI	Chester, Delaware, Montgomery, Philadelphia	42 min
Jun 2, 3:21 PM EDT	Severe Thunderstorm Warning	PHI	Philadelphia	39 min
Jun 2, 3:55 PM EDT	Special Weather Statement	PHI	Delaware	35 min
Jun 2, 4:01 PM EDT	Special Weather Statement	PHI	Bucks	29 min
Jun 2, 4:29 PM EDT	Special Weather Statement	PHI	Bucks, Montgomery, Philadelphia	31 min
Jun 2, 5:46 PM EDT	Severe Thunderstorm Warning	PHI	Chester	44 min
Jun 2, 6:24 PM EDT	Special Weather Statement	PHI	Chester	36 min
Jun 2, 6:43 PM EDT	Severe Thunderstorm Warning	PHI	Chester, Delaware, Philadelphia	47 min
Jun 2, 6:53 PM EDT	Special Weather Statement	PHI	Berks	37 min
Jun 2, 7:11 PM EDT	Severe Thunderstorm Warning	PHI	Berks, Bucks, Chester, Montgomery	49 min
Jun 2, 7:34 PM EDT	Special Weather Statement	PHI	Philadelphia	26 min
Jun 2, 7:56 PM EDT	Special Weather Statement	PHI	Bucks	34 min
Jun 2, 7:36 PM EDT	Severe Thunderstorm Warning	PHI	Kent	39 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.