Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2019

Severe Thunderstorm Warning 113, NWS Philadelphia/Mount Holly

June 2, 20194 counties in Pennsylvania; New Castle County, Delaware

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Jun 2, 2019, 3:18 PM EDT for 4 counties in Pennsylvania; New Castle County, Delaware. It was in force for 42 min. 13 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, 3:18 PM EDT (19:18 UTC)
Expired: Jun 2, 2019, 4:00 PM EDT
In force: 42 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon
Hail: 1.25 in
Wind: 60.0 mph

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

The radar

The Philadelphia radar (KDIX), 85 km from the middle of the area, began a volume at 19:19 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, 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, 3:24 PM EDT	HAIL 0.75	Phoenixville, PA
Jun 2, 3:29 PM EDT	HAIL 0.25	King Of Prussia, PA
Jun 2, 3:30 PM EDT	HAIL 0.25	2 Wnw King Of Prussia, PA	MPING REPORT.
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.
Jun 2, 3:49 PM EDT	HAIL 0.88	Lima, PA
Jun 2, 3:50 PM EDT	HAIL 0.25	Media, PA
Jun 2, 3:53 PM EDT	HAIL 0.75	Glen Mills, PA	TIME ESTIMATED FROM RADAR.
Jun 2, 3:55 PM EDT	HAIL 0.25	East Norriton, PA
Jun 2, 3:56 PM EDT	HAIL 0.25	1 N Upper Dublin Twp, PA	MPING REPORT.

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
Jun 2, 3:05 PM EDT	Severe Thunderstorm Watch	SPC	7 hr

The nearest sounding before it

Washington/Dulle, VA (KIAD), launched 12:00Z, 7.3 hours before the alert went out and 204 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.

764 
WUUS51 KPHI 021918
SVRPHI
DEC003-PAC029-045-091-101-022000-
/O.NEW.KPHI.SV.W.0113.190602T1918Z-190602T2000Z/

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

The National Weather Service in Mount Holly NJ has issued a

* Severe Thunderstorm Warning for...
  Northeastern New Castle County in northern Delaware...
  South central Montgomery County in southeastern Pennsylvania...
  Eastern Chester County in southeastern Pennsylvania...
  Western Philadelphia County in southeastern Pennsylvania...
  Delaware County in southeastern Pennsylvania...

* Until 400 PM EDT.

* At 318 PM EDT, a severe thunderstorm was located over Marshallton,
  or near West Chester, moving east at 25 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.

* Locations impacted include...
  Philadelphia, West Chester, Norristown, Chester, Phoenixville, West
  Norriton, East Norriton, Yeadon, Westtown, Downingtown,
  Conshohocken, Folcroft, Ambler, Swarthmore, Paulsboro, Kennett
  Square, Narberth, East Lansdowne, Arden and Talleyville.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4010 7572 4020 7520 3989 7514 3988 7519
      3985 7525 3985 7533 3981 7539 3981 7573
TIME...MOT...LOC 1918Z 264DEG 24KT 3992 7564 

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

Davis

2 follow-up statements

348 
WWUS51 KPHI 021934
SVSPHI

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

DEC003-PAC029-045-091-101-022000-
/O.CON.KPHI.SV.W.0113.000000T0000Z-190602T2000Z/
New Castle DE-Montgomery PA-Chester PA-Philadelphia PA-Delaware PA-
334 PM EDT Sun Jun 2 2019

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 400 PM EDT
FOR NORTHEASTERN NEW CASTLE...SOUTH CENTRAL MONTGOMERY...EASTERN
CHESTER...WESTERN PHILADELPHIA AND DELAWARE COUNTIES...

At 334 PM EDT, a severe thunderstorm was located over Cheyney, or
near West Chester, moving east at 30 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, West Chester, Norristown, Chester, Phoenixville, West
Norriton, East Norriton, Yeadon, Westtown, Conshohocken, Folcroft,
Ambler, Swarthmore, Paulsboro, Narberth, East Lansdowne, Arden,
Talleyville, Elam and Bryn Mawr.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Continuous cloud to ground lightning is occurring with this storm.
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 4011 7565 4020 7520 3989 7514 3988 7519
      3985 7525 3985 7533 3981 7539 3981 7565
TIME...MOT...LOC 1934Z 264DEG 24KT 3993 7550 

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

SFJ

335 
WWUS51 KPHI 021951
SVSPHI

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

DEC003-PAC029-045-091-101-022001-
/O.EXP.KPHI.SV.W.0113.000000T0000Z-190602T2000Z/
New Castle DE-Montgomery PA-Chester PA-Philadelphia PA-Delaware PA-
351 PM EDT Sun Jun 2 2019

...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN NEW CASTLE...
SOUTH CENTRAL MONTGOMERY...EASTERN CHESTER...WESTERN PHILADELPHIA AND
DELAWARE COUNTIES WILL EXPIRE AT 400 PM EDT...
                
The storm which prompted the warning has weakened below severe
limits, and no longer poses an immediate threat to life or property.
Therefore, the warning will be allowed to expire.  However small hail
and heavy rain are still possible with this thunderstorm.

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

LAT...LON 4011 7565 4020 7520 3989 7514 3988 7519
      3985 7525 3985 7533 3981 7539 3981 7565
TIME...MOT...LOC 1951Z 274DEG 18KT 3991 7542 

$$

SFJ

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, 2:40 PM EDT	Severe Thunderstorm Warning	PHI	Chester, Delaware	50 min
Jun 2, 3:15 PM EDT	Special Weather Statement	PHI	Philadelphia	30 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.