Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2019

Severe Thunderstorm Warning 89, NWS Philadelphia/Mount Holly

May 29, 20196 counties in Pennsylvania

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at May 29, 2019, 4:18 PM EDT for 6 counties in Pennsylvania. It was in force for 42 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 29, 2019, 4:18 PM EDT (20:18 UTC)
Expired
May 29, 2019, 5:00 PM EDT
In force
42 min
Issued by
NWS Philadelphia/Mount Holly
Area
Storm-based polygon
Hail
1.5 in
Wind
70.0 mph

Counties Berks County, PA, Bucks County, PA, Chester County, PA, Lehigh County, PA, Montgomery County, PA, Northampton County, PA

The radar

The Philadelphia radar (KDIX), 110 km from the middle of the area, began a volume at 20:21 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

TimeReportWhereRemark
May 29, 4:18 PM EDTTSTM WND DMG1 Sw Huffs Church, PADELAYED REPORT OF TREES AND POWER LINES DOWN ON LONG LANE IN HEREFORD TWP. TIME ESTIMATED FROM RADAR.
May 29, 4:18 PM EDTTSTM WND DMG1 Wsw Huffs Church, PADELAYED REPORT. SEVERAL REPORTS OF TREES DOWN ON CONRAD ROAD IN DISTRICT TWP. TIME ESTIMATED FROM RADAR.
May 29, 4:32 PM EDTTSTM WND DMG2 Nnw Geryville, PADOWNED TREE ON WIRES ON VERA CRUZ RD. TIME ESTIMATED FROM RADAR.
May 29, 4:37 PM EDTTSTM WND DMGEarl Twp, PADELAYED REPORT. SEVERAL REPORTS OF TREES DOWN IN EARL TWP AND OLEY TWP, INCLUDING ON SHEEP HILL ROAD, PINE ROAD, AND SAW MILL ROAD IN EARL TWP AND MAIN STREET AND KAUFFMAN ROAD IN OLEY TWP. TIME ESTIMATED FROM RADAR.
May 29, 4:40 PM EDTTSTM WND DMGDouglass Twp, PADELAYED REPORT. SEVERAL REPORTS OF TREES AND WIRES DOWN IN DOUGLASS TWP, INCLUDING ON POPLAR ROAD, READING AVENUE, AND TROUT RUN ROAD. TIME ESTIMATED FROM RADAR.
May 29, 4:40 PM EDTHAIL 1Boyertown, PADELAYED REPORT FROM WEDNESDAY. TIME ESTIMATED FROM RADAR.
May 29, 4:48 PM EDTTSTM WND DMGPerkasie, PAAT LEAST ONE LARGE TREE DOWN. TIME ESTIMATED FROM RADAR.
May 29, 4:50 PM EDTHAIL 0.25Boyertown, PA
May 29, 4:55 PM EDTTSTM WND DMG1 Se Green Lane, PANUMEROUS TREES DOWN. TIME ESTIMATED FROM RADAR.
May 29, 4:55 PM EDTTSTM WND DMG3 W Lower Frederick Twp, PANEIFFER RD CLOSED FROM RTE 73 TO RIDGE PIKE DUE TO DOWNED TREES. TIME ESTIMATED FROM RADAR.
May 29, 4:55 PM EDTTSTM WND DMGGreen Lane, PAREPORT OF TREES DOWN. TIME ESTIMATED FROM RADAR.
May 29, 4:55 PM EDTTSTM WND DMGPerkiomenville, PAMULTIPLE REPORTS OF SEVERAL TREES UPROOTED OR SNAPPED. TIME ESTIMATED FROM RADAR.
May 29, 4:55 PM EDTTSTM WND DMGPerkiomenville, PASEVERAL TREES AND POWER LINES DOWN. TIME ESTIMATED FROM RADAR.
May 29, 4:56 PM EDTTSTM WND GST 551 N Green Lane, PA
May 29, 4:56 PM EDTHAIL 1Green Lane, PA
May 29, 5:00 PM EDTTSTM WND DMGUpper Salford Twp, PATREES DOWN IN WOXALL/UPPER SALFORD TWP.

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.

IssuedProductOfficeLasted
May 29, 1:10 PM EDTTornado WatchSPC8 hr

The nearest sounding before it

Brookhaven, NY (KOKX), launched 12:00Z, 8.3 hours before the alert went out and 228 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-pSkew-T log-p diagram, Brookhaven, NY at 12:00Z on 2019-05-29Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCLEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Brookhaven, NY at 12:00Z on 2019-05-29The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -157 square meters per square second.19395878Sfc1 km3 km6 km9 kmRMLM
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
415 m above ground
0-6 km bulk shear
47 kt
0-1 km storm-relative helicity
-157 m²/s²
0-3 km storm-relative helicity
-76 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

442 
WUUS51 KPHI 292018
SVRPHI
PAC011-017-029-077-091-095-292100-
/O.NEW.KPHI.SV.W.0089.190529T2018Z-190529T2100Z/

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

The National Weather Service in Mount Holly NJ has issued a

* Severe Thunderstorm Warning for...
  Eastern Berks County in eastern Pennsylvania...
  Montgomery County in southeastern Pennsylvania...
  Southeastern Lehigh County in eastern Pennsylvania...
  Northwestern Bucks County in southeastern Pennsylvania...
  Northeastern Chester County in southeastern Pennsylvania...
  South central Northampton County in eastern Pennsylvania...

* Until 500 PM EDT.

* At 417 PM EDT, a severe thunderstorm was located over Laureldale,
  or near Reading, moving east at 40 mph.

  HAZARD...70 mph wind gusts and ping pong ball size hail.

  SOURCE...Radar indicated.

  IMPACT...People and animals outdoors will be injured. Expect hail 
           damage to roofs, siding, windows, and vehicles. Expect 
           considerable tree damage. Wind damage is also likely to 
           mobile homes, roofs, and outbuildings.

* Locations impacted include...
  Allentown, Bethlehem, Pottstown, Lansdale, East Norriton, Emmaus,
  Quakertown, Perkasie, Doylestown, Souderton, Bedminster, Ambler,
  Hellertown, Collegeville, Royersford, Chalfont, Trappe, Hatfield,
  East Greenville and Dublin.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A tornado watch remains in effect until 800 PM EDT for northwestern
New Jersey...and eastern and southeastern Pennsylvania.

A tornado watch remains in effect for the warned area. Tornadoes can
develop quickly from severe thunderstorms. Although a tornado is not
immediately likely, if one is spotted, act quickly and move to a
place of safety inside a sturdy structure such as a basement or small
interior room.

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

&&

LAT...LON 4062 7572 4065 7558 4055 7509 4013 7518
      4021 7580
TIME...MOT...LOC 2017Z 277DEG 35KT 4037 7587 

HAIL...1.50IN
WIND...70MPH
 
$$

Iovino

The office that day

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

IssuedProductOfficeCountiesLasted
May 28, 8:23 PM EDTTornado WarningPHIMonroe37 min
May 28, 9:17 PM EDTRiver Flood WarningPHIChester101 min
May 29, 3:18 AM EDTFlash Flood WatchPHIBerks, Bucks, Carbon, Chester, Delaware, Lehigh and 4 more18 hr
May 29, 2:19 PM EDTSpecial Weather StatementPHILehigh41 min
May 29, 2:26 PM EDTSpecial Weather StatementPHIMontgomery34 min
May 29, 2:30 PM EDTSevere Thunderstorm WarningPHIBerks, Bucks, Lehigh, Montgomery, Northampton60 min
May 29, 2:48 PM EDTSpecial Weather StatementPHIMonroe27 min
May 29, 2:59 PM EDTSevere Thunderstorm WarningPHICarbon, Monroe46 min
May 29, 3:10 PM EDTSevere Thunderstorm WarningPHIBucks, Lehigh, Northampton65 min
May 29, 3:17 PM EDTTornado WarningPHIBucks, Lehigh28 min
May 29, 3:29 PM EDTSevere Thunderstorm WarningPHICarbon, Monroe, Northampton46 min
May 29, 3:29 PM EDTSevere Thunderstorm WarningPHICarbon, Lehigh, Monroe, Northampton46 min
May 29, 3:38 PM EDTTornado WarningPHIBucks37 min
May 29, 3:43 PM EDTFlash Flood WarningPHICarbon, Monroe4 hr
May 29, 3:43 PM EDTSevere Thunderstorm WarningPHIBerks, Lehigh62 min
May 29, 3:43 PM EDTSevere Thunderstorm WarningPHIMonroe, Northampton47 min
May 29, 4:04 PM EDTSevere Thunderstorm WarningPHIBucks41 min
May 29, 4:09 PM EDTSevere Thunderstorm WarningPHIMonroe, Northampton51 min
May 29, 4:13 PM EDTSevere Thunderstorm WarningPHIBucks, Lehigh, Northampton47 min
May 29, 4:16 PM EDTSevere Thunderstorm WarningPHICarbon, Lehigh, Monroe, Northampton27 min
May 29, 4:27 PM EDTAreal Flood AdvisoryPHIBerks, Bucks, Carbon, Chester, Lehigh, Monroe and 2 more51 min
May 29, 4:35 PM EDTSpecial Weather StatementPHIBerks, Carbon, Lehigh, Monroe, Northampton25 min
May 29, 4:42 PM EDTSevere Thunderstorm WarningPHICarbon, Lehigh, Monroe, Northampton48 min
May 29, 4:50 PM EDTSevere Thunderstorm WarningPHIBerks, Carbon, Chester, Lehigh, Montgomery, Northampton40 min
May 29, 4:53 PM EDTSevere Thunderstorm WarningPHIBucks, Montgomery67 min
May 29, 4:55 PM EDTFlash Flood WarningPHIBerks, Bucks, Chester, Lehigh, Montgomery4 hr
May 29, 5:08 PM EDTTornado WarningPHIBucks, Montgomery27 min
May 29, 5:14 PM EDTFlash Flood WarningPHIBerks, Bucks, Carbon, Lehigh, Monroe, Northampton3 hr
May 29, 5:23 PM EDTSevere Thunderstorm WarningPHIBerks, Bucks, Chester, Lehigh, Monroe, Montgomery and 1 more34 min
May 29, 5:27 PM EDTFlash Flood WarningPHIBucks, Chester, Montgomery, Philadelphia4 hr
May 29, 5:33 PM EDTTornado WarningPHIBucks27 min
May 29, 5:39 PM EDTSevere Thunderstorm WarningPHIBucks66 min
May 29, 5:49 PM EDTSevere Thunderstorm WarningPHIBerks, Chester, Delaware, Montgomery, Philadelphia41 min
May 29, 6:06 PM EDTFlash Flood WarningPHIBucks4 hr
May 29, 6:06 PM EDTSevere Thunderstorm WarningPHIBucks, Montgomery, Philadelphia24 min
May 29, 6:22 PM EDTSevere Thunderstorm WarningPHIChester, Delaware, Montgomery, Philadelphia53 min
May 29, 6:35 PM EDTFlash Flood WarningPHIBerks, Chester, Delaware, Montgomery, Philadelphia3 hr
May 29, 7:12 PM EDTAreal Flood AdvisoryPHIChester3 hr

Nearby

Severe Thunderstorm Warnings in Pennsylvania, 2019Every 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.