Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2019

Severe Thunderstorm Warning 92, NWS Philadelphia/Mount Holly

May 29, 20196 counties in Pennsylvania

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at May 29, 2019, 4:50 PM EDT for 6 counties in Pennsylvania. It was in force for 40 min. 9 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, 4:50 PM EDT (20:50 UTC)
Expired: May 29, 2019, 5:30 PM EDT
In force: 40 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

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

The radar

The Philadelphia radar (KDIX), 150 km from the middle of the area, began a volume at 20:53 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, 4:50 PM EDT	HAIL 0.25	Boyertown, PA
May 29, 4:51 PM EDT	TSTM WND GST 77	2 Wsw Lenhartsville, PA
May 29, 5:12 PM EDT	TSTM WND GST 66	1 Ene Hamburg, PA	MEASURED BY A PERSONAL WEATHER STATION. TIME ESTIMATED FROM RADAR.
May 29, 5:19 PM EDT	TSTM WND DMG	2 Wsw Laureldale, PA	DELAYED REPORT OF TREE AND WIRES DOWN ON RIVER ROAD IN MUHLENBERG TWP. TIME ESTIMATED FROM RADAR.
May 29, 5:24 PM EDT	TSTM WND DMG	1 Nnw Shillington, PA	DELAYED REPORT OF TREES DOWN ON MUSEUM ROAD BETWEEN LANCASTER AVENUE AND OLD MILL ROAD. TIME ESTIMATED FROM RADAR.
May 29, 5:34 PM EDT	TSTM WND DMG	2 Ene Robeson Twp, PA	DELAYED REPORT OF DOWNED TREE BLOCKING THE ROADWAY ON CEDAR HILL ROAD NORTH OF COCALICO ROAD. TIME ESTIMATED FROM RADAR.
May 29, 5:35 PM EDT	TSTM WND DMG	Boyertown, PA	TREES REPORTED DOWN IN BOYERTOWN. TIME ESTIMATED FROM RADAR.
May 29, 5:39 PM EDT	TSTM WND DMG	1 Wsw Stowe, PA	DELAYED REPORT. DOWNED TREE ON ROUTE 724 NEAR THE CHESTER COUNTY LINE. TIME ESTIMATED FROM RADAR.
May 29, 5:40 PM EDT	HAIL 0.25	1 N Colebrookdale Twp, PA

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, 8.8 hours before the alert went out and 215 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.

609 
WUUS51 KPHI 292050
SVRPHI
PAC011-025-029-077-091-095-292130-
/O.NEW.KPHI.SV.W.0092.190529T2050Z-190529T2130Z/

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

The National Weather Service in Mount Holly NJ has issued a

* Severe Thunderstorm Warning for...
  Berks County in eastern Pennsylvania...
  Northwestern Montgomery County in southeastern Pennsylvania...
  Lehigh County in eastern Pennsylvania...
  Southwestern Carbon County in northeastern Pennsylvania...
  North central Chester County in southeastern Pennsylvania...
  Southwestern Northampton County in eastern Pennsylvania...

* Until 530 PM EDT.

* At 450 PM EDT, severe thunderstorms were located along a line
  extending from near Lehighton to near Hummelstown, moving southeast
  at 50 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...
  Allentown, Reading, Bethlehem, Pottstown, Emmaus, Wyomissing,
  Northampton, Birdsboro, Kutztown, Jim Thorpe, Hamburg, Slatington,
  Fleetwood, Sinking Spring, Laureldale, Womelsdorf, Wernersville,
  Newmanstown, Walnutport and Topton.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A tornado watch remains in effect until 800 PM EDT for eastern,
southeastern and northeastern Pennsylvania.

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

&&

LAT...LON 4049 7643 4052 7625 4057 7602 4065 7598
      4070 7583 4074 7576 4089 7597 4090 7595
      4065 7531 4024 7568 4013 7587 4036 7621
      4037 7623
TIME...MOT...LOC 2050Z 321DEG 46KT 4084 7576 4024 7668 

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

NC

2 follow-up statements

348 
WWUS51 KPHI 292116
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
516 PM EDT Wed May 29 2019

PAC025-292125-
/O.CAN.KPHI.SV.W.0092.000000T0000Z-190529T2130Z/
Carbon PA-
516 PM EDT Wed May 29 2019

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHWESTERN CARBON 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 800 PM EDT for eastern and
southeastern Pennsylvania.

LAT...LON 4049 7643 4052 7625 4057 7602 4065 7598
      4070 7583 4078 7565 4065 7531 4024 7568
      4013 7587 4036 7621 4037 7623
TIME...MOT...LOC 2115Z 321DEG 46KT 4059 7550 3999 7642 

$$

PAC011-029-077-091-095-292130-
/O.CON.KPHI.SV.W.0092.000000T0000Z-190529T2130Z/
Berks PA-Montgomery PA-Lehigh PA-Chester PA-Northampton PA-
516 PM EDT Wed May 29 2019

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 530 PM EDT
FOR BERKS...NORTHWESTERN MONTGOMERY...LEHIGH...NORTH CENTRAL CHESTER
AND SOUTHWESTERN NORTHAMPTON COUNTIES...

At 515 PM EDT, severe thunderstorms were located along a line
extending from Allentown to near Mountville, moving southeast 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...
Allentown, Reading, Bethlehem, Pottstown, Emmaus, Wyomissing,
Northampton, Birdsboro, Kutztown, Hamburg, Slatington, Fleetwood,
Sinking Spring, Laureldale, Womelsdorf, Wernersville, Newmanstown,
Walnutport, Topton and Leesport.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

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

&&

LAT...LON 4049 7643 4052 7625 4057 7602 4065 7598
      4070 7583 4078 7565 4065 7531 4024 7568
      4013 7587 4036 7621 4037 7623
TIME...MOT...LOC 2115Z 321DEG 46KT 4059 7550 3999 7642 

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

NC

030 
WWUS51 KPHI 292128
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
528 PM EDT Wed May 29 2019

PAC011-029-077-091-095-292137-
/O.EXP.KPHI.SV.W.0092.000000T0000Z-190529T2130Z/
Berks PA-Montgomery PA-Lehigh PA-Chester PA-Northampton PA-
528 PM EDT Wed May 29 2019

...THE SEVERE THUNDERSTORM WARNING FOR BERKS...NORTHWESTERN
MONTGOMERY...LEHIGH...NORTH CENTRAL CHESTER AND SOUTHWESTERN
NORTHAMPTON COUNTIES WILL EXPIRE AT 530 PM EDT...
    
The storms which prompted the warning have moved out of the area.
Therefore, the warning will be allowed to expire.

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

To report severe weather, contact your nearest law enforcement
agency. They will relay your report to the National Weather Service
Mount Holly NJ.



LAT...LON 4049 7643 4052 7625 4057 7602 4065 7598
      4070 7583 4078 7565 4065 7531 4024 7568
      4013 7587 4036 7621 4037 7623
TIME...MOT...LOC 2127Z 321DEG 46KT 4059 7550 3999 7642 

$$

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, 4:53 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, 5:49 PM EDT	Severe Thunderstorm Warning	PHI	Berks, Chester, Delaware, Montgomery, Philadelphia	41 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

Nearby

Severe Thunderstorm Warnings in Pennsylvania, 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.