Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2019

Severe Thunderstorm Warning 35, NWS Philadelphia/Mount Holly

May 19, 20196 counties in Pennsylvania

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at May 19, 2019, 9:09 PM EDT for 6 counties in Pennsylvania. It was in force for 51 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, 9:09 PM EDT (01:09 UTC)
Expired: May 19, 2019, 10:00 PM EDT
In force: 51 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, Bucks County, PA, Chester County, PA, Lehigh County, PA, Montgomery County, PA, Northampton County, PA

The radar

The Philadelphia radar (KDIX), 107 km from the middle of the area, began a volume at 01:09 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, 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.
May 19, 9:40 PM EDT	TSTM WND DMG	2 S Glendon, PA	* 1 INJ * LARGE TREE DOWN ONTO A HOUSE IN THE 2700 BLOCK OF MORGAN HILL ROAD IN WILLIAMS TOWNSHIP. A SECTION OF THE HOME WAS ESSENTIALLY DESTROYED. A WOMAN IN THE HOME HAD MINOR INJURIES. TIME ESTIMATED FROM RADAR.
May 19, 9:51 PM EDT	TSTM WND DMG	2 Ne Ottsville, PA	CALLER REPORTS DOZENS OF TREES UPROOTED AND DAMAGED ON HIS PROPERTY WITH POWER POLES AND LINES DOWN AS WELL. TIME ESTIMATED FROM RADAR.
May 19, 9:51 PM EDT	TORNADO	2 Ne Ottsville, PA	A STORM SURVEY TEAM DETERMINED A TORNADO BRIEFLY TOUCHED DOWN OVER THE BEAVER VALLEY CAMPGROUNDS IN TINICUM TOWNSHIP, BUCKS COUNTY, PA NEAR OTTSVILLE ON SUNDAY EVENING. THE TORNADO TRACKED FROM SOUTHWEST TO NORTHEAST ACROSS THE PROPERTY FOR APPROXIMATELY ONE Q

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

Brookhaven, NY (KOKX), launched 00:00Z, 1.2 hours before the alert went out and 224 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: 61 J/kg
Mixed-layer CIN: -284 J/kg
Mixed-layer LCL: 581 m above ground
0-6 km bulk shear: 18 kt
0-1 km storm-relative helicity: 147 m²/s²
0-3 km storm-relative helicity: 224 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.7

Open this sounding in Storm Lab

The text

As transmitted.

330 
WUUS51 KPHI 200109
SVRPHI
PAC011-017-029-077-091-095-200200-
/O.NEW.KPHI.SV.W.0035.190520T0109Z-190520T0200Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mount Holly NJ
909 PM EDT Sun May 19 2019

The National Weather Service in Mount Holly NJ has issued a

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

* Until 1000 PM EDT.

* At 908 PM EDT, severe thunderstorms were located along a line
  extending from near Zionsville to near Fleetwood to near Terre
  Hill, 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...
  Allentown, Reading, Easton, Bethlehem, Pottstown, Forks, Emmaus,
  Wyomissing, Quakertown, Perkasie, Wilson, Souderton, Bedminster,
  Hellertown, Birdsboro, Kutztown, Royersford, Fleetwood, Sinking
  Spring and Tinicum.

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 4045 7597 4072 7524 4067 7518 4065 7520
      4057 7519 4058 7512 4054 7507 4043 7507
      4013 7559 4012 7586 4030 7613
TIME...MOT...LOC 0108Z 255DEG 27KT 4045 7552 4042 7585 4015 7610 

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

Robertson

1 follow-up statement

708 
WWUS51 KPHI 200133
SVSPHI

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

PAC011-017-029-077-091-095-200200-
/O.CON.KPHI.SV.W.0035.000000T0000Z-190520T0200Z/
Berks PA-Montgomery PA-Lehigh PA-Bucks PA-Chester PA-Northampton PA-
933 PM EDT Sun May 19 2019

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1000 PM EDT
FOR SOUTHEASTERN BERKS...NORTHWESTERN MONTGOMERY...SOUTHEASTERN
LEHIGH...NORTHWESTERN BUCKS...NORTH CENTRAL CHESTER AND SOUTH CENTRAL
NORTHAMPTON COUNTIES...

At 932 PM EDT, severe thunderstorms were located along a line
extending from near Old Orchard to Spring Mount to near New Morgan,
moving east at 40 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, Easton, Bethlehem, Pottstown, Forks, Emmaus,
Quakertown, Perkasie, Wilson, Souderton, Bedminster, Hellertown,
Birdsboro, Royersford, Tinicum, Trappe, East Greenville, Dublin and
Topton.

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 these storms.
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 4013 7572 4012 7586 4022 7600 4044 7579
      4062 7551 4072 7524 4071 7523 4067 7518
      4065 7520 4057 7519 4058 7512 4054 7507
      4043 7507 4013 7559
TIME...MOT...LOC 0132Z 253DEG 36KT 4062 7527 4028 7544 4016 7590 

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, 8:37 PM EDT	Severe Thunderstorm Warning	PHI	Berks, Lehigh, Montgomery	38 min
May 19, 8:43 PM EDT	Flash Flood Warning	PHI	Berks	3 hr
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.