Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2019

Severe Thunderstorm Warning 34, NWS Philadelphia/Mount Holly

May 19, 2019Berks County, Lehigh County, Montgomery County, Pennsylvania

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at May 19, 2019, 8:37 PM EDT for Berks County, Lehigh County, Montgomery County, Pennsylvania. It was in force for 38 min. 6 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 19, 2019, 8:37 PM EDT (00:37 UTC)
Expired: May 19, 2019, 9:15 PM EDT
In force: 38 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon
Tornado: Possible
Hail: 1.0 in
Wind: 60.0 mph

Counties Berks County, PA, Lehigh County, PA, Montgomery County, PA

The radar

The Philadelphia radar (KDIX), 131 km from the middle of the area, began a volume at 00:49 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 19, 8:51 PM EDT	TSTM WND GST 60	Laureldale, PA	TRAINED SPOTTER ESTIMATED 60 TO 65 MPH WIND GUSTS WITH VERY HEAVY RAINFALL AND NO HAIL.
May 19, 8:57 PM EDT	HAIL 1	Sinking Spring, PA	QUARTER SIZE HAIL AND ESTIMATED 30-40 MPH WIND GUSTS REPORTED IN SINKING SPRING. TIME ESTIMATED FROM RADAR.
May 19, 9:01 PM EDT	TSTM WND DMG	1 Wnw Temple, PA	TREE DOWN IN BERN TWP NEAR ROUTE 61 AND CROSS KEYS ROAD. TIME ESTIMATED FROM RADAR.
May 19, 9:14 PM EDT	TSTM WND DMG	1 Sse Bechtelsville, PA	TREE DOWN ON TOWNSHIP LINE ROAD 1 MILE FROM ROUTE 100. TIME ESTIMATED FROM RADAR.
May 19, 9:15 PM EDT	TSTM WND DMG	1 Wnw Washington Twp, PA	TREE DOWN ON WIRES ON FORGE DALE ROAD. TIME ESTIMATED FROM RADAR.
May 19, 9:17 PM EDT	TSTM WND DMG	Boyertown, PA	TREE AND POWER LINES DOWN ON E PHILADELPHIA AVENUE. TIME ESTIMATED FROM RADAR.

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 19, 2:36 PM EDT	Severe Thunderstorm Watch	SPC	8 hr

The nearest sounding before it

Washington/Dulle, VA (KIAD), launched 00:00Z, 0.6 hours before the alert went out and 213 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: 953 J/kg
Mixed-layer CIN: -17 J/kg
Mixed-layer LCL: 1793 m above ground
0-6 km bulk shear: 33 kt
0-1 km storm-relative helicity: 146 m²/s²
0-3 km storm-relative helicity: 237 m²/s²
Significant tornado parameter: 0.1
Supercell composite: 3.8

Open this sounding in Storm Lab

The text

As transmitted.

969 
WUUS51 KPHI 200037
SVRPHI
PAC011-077-091-200115-
/O.NEW.KPHI.SV.W.0034.190520T0037Z-190520T0115Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mount Holly NJ
837 PM EDT Sun May 19 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...
  Central Lehigh County in eastern Pennsylvania...

* Until 915 PM EDT.

* At 837 PM EDT, severe thunderstorms were located along a line
  extending from near Strausstown to near Fleetwood to near Reading,
  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...
  Allentown, Reading, Emmaus, Wyomissing, Birdsboro, Kutztown,
  Hamburg, Fleetwood, Sinking Spring, Laureldale, East Greenville,
  Womelsdorf, Wernersville, Newmanstown, Topton, Leesport,
  Shoemakersville, Bally, Bernville and Bechtelsville.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

In addition to large hail and damaging winds, frequent cloud to
ground lightning is occurring with these storms. Move indoors
immediately. Remember, if you can hear thunder, you are close enough
to be struck by lightning.

&&

LAT...LON 4067 7581 4061 7548 4043 7547 4042 7548
      4041 7546 4035 7546 4020 7597 4031 7614
      4036 7621 4037 7623 4042 7632
TIME...MOT...LOC 0037Z 241DEG 23KT 4048 7615 4043 7587 4033 7586 

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

Robertson

1 follow-up statement

615 
WWUS51 KPHI 200054
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
854 PM EDT Sun May 19 2019

PAC011-077-091-200115-
/O.CON.KPHI.SV.W.0034.000000T0000Z-190520T0115Z/
Berks PA-Montgomery PA-Lehigh PA-
854 PM EDT Sun May 19 2019

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 915 PM EDT
FOR BERKS...NORTHWESTERN MONTGOMERY AND SOUTHWESTERN LEHIGH
COUNTIES...

At 854 PM EDT, severe thunderstorms were located along a line
extending from near Bernville to Topton to Bechtelsville, moving
northeast 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...
Allentown, Reading, Emmaus, Wyomissing, Birdsboro, Kutztown,
Fleetwood, Sinking Spring, Laureldale, East Greenville, Womelsdorf,
Wernersville, Newmanstown, Topton, Leesport, Shoemakersville, Bally,
Bernville, Bechtelsville and Lyons.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4061 7548 4043 7547 4042 7548 4041 7546
      4035 7546 4020 7597 4031 7614 4036 7621
      4037 7623 4042 7632 4064 7567
TIME...MOT...LOC 0054Z 240DEG 24KT 4039 7610 4049 7572 4037 7566 

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

Robertson

The office that day

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

Issued	Product	Office	Counties	Lasted
May 19, 8:14 PM EDT	Special Weather Statement	PHI	Lehigh	46 min
May 19, 8:35 PM EDT	Tornado Warning	PHI	Berks	25 min
May 19, 8:43 PM EDT	Flash Flood Warning	PHI	Berks	3 hr
May 19, 9:09 PM EDT	Severe Thunderstorm Warning	PHI	Berks, Bucks, Chester, Lehigh, Montgomery, Northampton	51 min
May 19, 9:29 PM EDT	Flash Flood Warning	PHI	Berks, Bucks, Lehigh, Montgomery, Northampton	4 hr
May 19, 9:46 PM EDT	Severe Thunderstorm Warning	PHI	Bucks, Chester, Montgomery, Northampton	44 min
May 19, 10:27 PM EDT	Severe Thunderstorm Warning	PHI	Bucks	48 min
May 19, 10:34 PM EDT	Areal Flood Advisory	PHI	Bucks, Lehigh, Northampton	3 hr
May 19, 10:48 PM EDT	Flash Flood Warning	PHI	Berks	117 min
May 19, 11:00 PM EDT	Severe Thunderstorm Warning	PHI	Berks, Carbon, Lehigh, Monroe, Northampton	60 min
May 19, 11:15 PM EDT	Flash Flood Warning	PHI	Carbon, Lehigh, Monroe, Northampton	3 hr
May 19, 11:41 PM EDT	Severe Thunderstorm Warning	PHI	Northampton	53 min
May 19, 11:54 PM EDT	Severe Thunderstorm Warning	PHI	Lehigh, Northampton	39 min
May 20, 12:57 AM EDT	Areal Flood Advisory	PHI	Berks	3 hr
May 20, 1:21 AM EDT	Areal Flood Advisory	PHI	Berks, Montgomery	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.