Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2019

Severe Thunderstorm Warning 96, NWS Philadelphia/Mount Holly

May 29, 20195 counties in Pennsylvania; New Castle County, Delaware

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at May 29, 2019, 5:49 PM EDT for 5 counties in Pennsylvania; New Castle County, Delaware. It was in force for 41 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: May 29, 2019, 5:49 PM EDT (21:49 UTC)
Expired: May 29, 2019, 6:30 PM EDT
In force: 41 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

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

The radar

The Philadelphia radar (KDIX), 108 km from the middle of the area, began a volume at 21:50 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 29, 6:00 PM EDT	HAIL 0.88	2 S Horsham Twp, PA
May 29, 6:00 PM EDT	HAIL 0.88	Hatboro, PA
May 29, 6:02 PM EDT	HAIL 0.7	1 Wsw Horsham, PA
May 29, 6:06 PM EDT	TSTM WND DMG	1 Ene Berwyn, PA	TREE DOWN ON WATERLOO RD. TIME ESTIMATED FROM RADAR.
May 29, 6:10 PM EDT	HAIL 1	2 N Lower Moreland Twp, PA
May 29, 6:10 PM EDT	HAIL 1	2 Sse Warminster Twp, PA
May 29, 6:10 PM EDT	HAIL 1	Willow Grove, PA
May 29, 6:10 PM EDT	HAIL 1	Willow Grove, PA
May 29, 6:24 PM EDT	TSTM WND DMG	1 Ese Malvern, PA	DOWNED UTILITY ON PAOLI PIKE NEAR GRUBB ROAD. TIME ESTIMATED FROM RADAR.
May 29, 6:35 PM EDT	TSTM WND DMG	1 Ene Berwyn, PA	TREE DOWN.

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 29, 1:10 PM EDT	Tornado Watch	SPC	8 hr

The nearest sounding before it

Washington/Dulle, VA (KIAD), launched 12:00Z, 9.8 hours before the alert went out and 189 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: 292 J/kg
Mixed-layer CIN: -123 J/kg
Mixed-layer LCL: 1463 m above ground
0-6 km bulk shear: 37 kt
0-1 km storm-relative helicity: 25 m²/s²
0-3 km storm-relative helicity: 30 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

333 
WUUS51 KPHI 292149
SVRPHI
DEC003-PAC011-029-045-091-101-292230-
/O.NEW.KPHI.SV.W.0096.190529T2149Z-190529T2230Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mount Holly NJ
549 PM EDT Wed May 29 2019

The National Weather Service in Mount Holly NJ has issued a

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

* Until 630 PM EDT.

* At 548 PM EDT, a severe thunderstorm was located over Churchtown,
  or 8 miles east of New Holland, moving east at 55 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, Pottstown,
  Phoenixville, West Norriton, East Norriton, Coatesville, Yeadon,
  Westtown, Downingtown, Conshohocken, Hatboro, Folcroft, Ambler,
  Swarthmore, Kennett Square, Collegeville and Royersford.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A tornado watch remains in effect until 800 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.

&&

LAT...LON 4025 7604 4025 7542 4018 7508 4013 7501
      3996 7513 3985 7527 3984 7536 3979 7541
      3980 7602 3986 7601 3987 7599 3994 7598
      3995 7600 4004 7593 4011 7594 4014 7588
TIME...MOT...LOC 2148Z 276DEG 48KT 4012 7593 

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

NC

The office that day

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

Issued	Product	Office	Counties	Lasted
May 28, 8:23 PM EDT	Tornado Warning	PHI	Monroe	37 min
May 28, 9:17 PM EDT	River Flood Warning	PHI	Chester	101 min
May 29, 3:18 AM EDT	Flash Flood Watch	PHI	Berks, Bucks, Carbon, Chester, Delaware, Lehigh and 4 more	18 hr
May 29, 2:19 PM EDT	Special Weather Statement	PHI	Lehigh	41 min
May 29, 2:26 PM EDT	Special Weather Statement	PHI	Montgomery	34 min
May 29, 2:30 PM EDT	Severe Thunderstorm Warning	PHI	Berks, Bucks, Lehigh, Montgomery, Northampton	60 min
May 29, 2:48 PM EDT	Special Weather Statement	PHI	Monroe	27 min
May 29, 2:59 PM EDT	Severe Thunderstorm Warning	PHI	Carbon, Monroe	46 min
May 29, 3:10 PM EDT	Severe Thunderstorm Warning	PHI	Bucks, Lehigh, Northampton	65 min
May 29, 3:17 PM EDT	Tornado Warning	PHI	Bucks, Lehigh	28 min
May 29, 3:29 PM EDT	Severe Thunderstorm Warning	PHI	Carbon, Monroe, Northampton	46 min
May 29, 3:29 PM EDT	Severe Thunderstorm Warning	PHI	Carbon, Lehigh, Monroe, Northampton	46 min
May 29, 3:38 PM EDT	Tornado Warning	PHI	Bucks	37 min
May 29, 3:43 PM EDT	Flash Flood Warning	PHI	Carbon, Monroe	4 hr
May 29, 3:43 PM EDT	Severe Thunderstorm Warning	PHI	Berks, Lehigh	62 min
May 29, 3:43 PM EDT	Severe Thunderstorm Warning	PHI	Monroe, Northampton	47 min
May 29, 4:04 PM EDT	Severe Thunderstorm Warning	PHI	Bucks	41 min
May 29, 4:09 PM EDT	Severe Thunderstorm Warning	PHI	Monroe, Northampton	51 min
May 29, 4:13 PM EDT	Severe Thunderstorm Warning	PHI	Bucks, Lehigh, Northampton	47 min
May 29, 4:16 PM EDT	Severe Thunderstorm Warning	PHI	Carbon, Lehigh, Monroe, Northampton	27 min
May 29, 4:18 PM EDT	Severe Thunderstorm Warning	PHI	Berks, Bucks, Chester, Lehigh, Montgomery, Northampton	42 min
May 29, 4:27 PM EDT	Areal Flood Advisory	PHI	Berks, Bucks, Carbon, Chester, Lehigh, Monroe and 2 more	51 min
May 29, 4:35 PM EDT	Special Weather Statement	PHI	Berks, Carbon, Lehigh, Monroe, Northampton	25 min
May 29, 4:42 PM EDT	Severe Thunderstorm Warning	PHI	Carbon, Lehigh, Monroe, Northampton	48 min
May 29, 4:50 PM EDT	Severe Thunderstorm Warning	PHI	Berks, Carbon, Chester, Lehigh, Montgomery, Northampton	40 min
May 29, 4:53 PM EDT	Severe Thunderstorm Warning	PHI	Bucks, Montgomery	67 min
May 29, 4:55 PM EDT	Flash Flood Warning	PHI	Berks, Bucks, Chester, Lehigh, Montgomery	4 hr
May 29, 5:08 PM EDT	Tornado Warning	PHI	Bucks, Montgomery	27 min
May 29, 5:14 PM EDT	Flash Flood Warning	PHI	Berks, Bucks, Carbon, Lehigh, Monroe, Northampton	3 hr
May 29, 5:23 PM EDT	Severe Thunderstorm Warning	PHI	Berks, Bucks, Chester, Lehigh, Monroe, Montgomery and 1 more	34 min
May 29, 5:27 PM EDT	Flash Flood Warning	PHI	Bucks, Chester, Montgomery, Philadelphia	4 hr
May 29, 5:33 PM EDT	Tornado Warning	PHI	Bucks	27 min
May 29, 5:39 PM EDT	Severe Thunderstorm Warning	PHI	Bucks	66 min
May 29, 6:06 PM EDT	Flash Flood Warning	PHI	Bucks	4 hr
May 29, 6:06 PM EDT	Severe Thunderstorm Warning	PHI	Bucks, Montgomery, Philadelphia	24 min
May 29, 6:22 PM EDT	Severe Thunderstorm Warning	PHI	Chester, Delaware, Montgomery, Philadelphia	53 min
May 29, 6:35 PM EDT	Flash Flood Warning	PHI	Berks, Chester, Delaware, Montgomery, Philadelphia	3 hr
May 29, 7:12 PM EDT	Areal Flood Advisory	PHI	Chester	3 hr
May 29, 6:02 PM EDT	Special Weather Statement	PHI	New Castle	28 min
May 29, 6:11 PM EDT	Severe Thunderstorm Warning	PHI	Kent, New Castle	34 min
May 29, 6:30 PM EDT	Special Weather Statement	PHI	Kent	30 min
May 29, 6:58 PM EDT	Special Weather Statement	PHI	Kent	32 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.