Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2017

Severe Thunderstorm Warning 39, NWS Philadelphia/Mount Holly

June 19, 20174 counties in Pennsylvania

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Jun 19, 2017, 2:49 PM EDT for 4 counties in Pennsylvania. It was in force for 41 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: Jun 19, 2017, 2:49 PM EDT (18:49 UTC)
Expired: Jun 19, 2017, 3:30 PM EDT
In force: 41 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon
Tornado: Possible
Hail: 0.75 in
Wind: 60.0 mph

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

The radar

The Philadelphia radar (KDIX), 127 km from the middle of the area, began a volume at 18:51 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
Jun 19, 2:56 PM EDT	TSTM WND GST 55	Reading Regional Airpor, PA
Jun 19, 3:12 PM EDT	TSTM WND DMG	Lyon Valley, PA	TREE AND BUILDING DAMAGE AT THE INTERSECTION OF ROUTE 100 AND LYON VALLEY ROAD
Jun 19, 3:12 PM EDT	TSTM WND DMG	Topton, PA	TREES SNAPPED AND UPROOTED.
Jun 19, 3:14 PM EDT	TSTM WND DMG	Lyon Valley, PA	WRECKED PATIO FURNITURE AND METAL FLASHING TORN FROM A ROOF ON CARPET ROAD
Jun 19, 3:17 PM EDT	TSTM WND DMG	Claussville, PA	TREE AND BUILDING DAMAGE AT INTERSECTION OF ROUTE 100 AND KEARNSVILLE ROAD
Jun 19, 3:18 PM EDT	TSTM WND DMG	Schnecksville, PA	DOWNED TREES AND WIRES THROUGHOUT THE COUNTY.

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
Jun 19, 11:13 AM EDT	Severe Thunderstorm Watch	SPC	9 hr

The nearest sounding before it

Washington/Dulle, VA (KIAD), launched 12:00Z, 6.8 hours before the alert went out and 220 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: 448 J/kg
Mixed-layer CIN: -97 J/kg
Mixed-layer LCL: 1049 m above ground
0-6 km bulk shear: 24 kt
0-1 km storm-relative helicity: 73 m²/s²
0-3 km storm-relative helicity: 82 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.2

Open this sounding in Storm Lab

The text

As transmitted.

811 
WUUS51 KPHI 191849
SVRPHI
PAC011-077-091-095-191930-
/O.NEW.KPHI.SV.W.0039.170619T1849Z-170619T1930Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mount Holly NJ
249 PM EDT MON JUN 19 2017

The National Weather Service in Mount Holly NJ has issued a

* Severe Thunderstorm Warning for...
  Eastern Berks County in eastern Pennsylvania...
  Northwestern Montgomery County in southeastern Pennsylvania...
  Lehigh County in eastern Pennsylvania...
  West central Northampton County in eastern Pennsylvania...

* Until 330 PM EDT

* At 249 PM EDT, severe thunderstorms were located along a line
  extending from near Lenhartsville to Leesport to near Fairview Hgts
  to near Sinking Spring, moving northeast at 35 mph.

  HAZARD...60 mph wind gusts. 

  SOURCE...Radar indicated. 

  IMPACT...Expect damage to trees and power lines. 

* Severe thunderstorms will be near,
  Lenhartsville around 255 PM EDT. 
  Wanamakers around 300 PM EDT. 
  Kutztown around 305 PM EDT. 
  Fleetwood and New Tripoli around 310 PM EDT. 
  Lyons and Schnecksville around 315 PM EDT. 
  Topton, Neffs and Claussville around 320 PM EDT. 
  Bechtelsville around 325 PM EDT. 
  Allentown, Emmaus, Northampton, East Greenville, Bally, Ancient 
  Oaks, Beersville, Coffeetown and Zionsville around 330 PM EDT. 

Other locations impacted by these severe thunderstorms include
Wyomissing Hills, West Lawn, Alburtis, Coplay, Fullerton, West
Reading, Kenhorst, Mount Penn, Hokendauqua and Reiffton.

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 this storm. Move indoors
immediately. Remember...if you can hear thunder...you are close
enough to be struck by lightning.

Torrential rainfall is occurring with these storms, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.

&&

LAT...LON 4042 7603 4063 7600 4077 7547 4058 7546
      4043 7547 4042 7548 4037 7547 4026 7601
      4036 7607
TIME...MOT...LOC 1849Z 245DEG 31KT 4061 7594 4045 7595 4040 7602 4029
7601

TORNADO...POSSIBLE
HAIL...<.75IN
WIND...60MPH
 
$$

Drag

2 follow-up statements

824 
WWUS51 KPHI 191902
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
302 PM EDT MON JUN 19 2017

PAC011-077-091-095-191930-
/O.CON.KPHI.SV.W.0039.000000T0000Z-170619T1930Z/
Berks PA-Montgomery PA-Lehigh PA-Northampton PA-
302 PM EDT MON JUN 19 2017

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 330 PM EDT
FOR NORTHEASTERN BERKS...NORTHWESTERN MONTGOMERY...LEHIGH AND WEST
CENTRAL NORTHAMPTON COUNTIES...

At 302 PM EDT, severe thunderstorms were located along a line
extending from Wanamakers to near Fleetwood to near Leesport to
Reading, moving northeast at 35 mph.

HAZARD...60 mph wind gusts. 

SOURCE...Radar indicated. 

IMPACT...Expect damage to trees and power lines. 

These severe storms will be near...
  Wanamakers around 305 PM EDT. 
  Kutztown, Fleetwood and New Tripoli around 310 PM EDT. 
  Lyons around 315 PM EDT. 
  Neffs and Schnecksville around 320 PM EDT. 
  Topton, Bechtelsville, Ancient Oaks and Claussville around 325 PM 
  EDT. 
  Allentown, Emmaus, Northampton, East Greenville, Bally, 
  Beersville, Coffeetown and Zionsville around 330 PM EDT. 

Other locations impacted by these severe thunderstorms include
Alburtis, Coplay, Fullerton, West Reading, Mount Penn, Hokendauqua,
Reiffton, Red Hill, Macungie and North Catasauqua.

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 this storm. Move indoors
immediately. Remember...if you can hear thunder...you are close
enough to be struck by lightning.

Torrential rainfall is occurring with these storms, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.

&&

LAT...LON 4041 7598 4054 7599 4065 7592 4077 7547
      4058 7546 4043 7547 4042 7548 4037 7547
      4028 7592 4037 7598
TIME...MOT...LOC 1902Z 245DEG 31KT 4065 7584 4049 7585 4044 7592 4033
7591

TORNADO...POSSIBLE
HAIL...<.75IN
WIND...60MPH
 
$$

Drag

576 
WWUS51 KPHI 191920
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
320 PM EDT MON JUN 19 2017

PAC011-077-091-095-191930-
/O.CON.KPHI.SV.W.0039.000000T0000Z-170619T1930Z/
Berks PA-Montgomery PA-Lehigh PA-Northampton PA-
320 PM EDT MON JUN 19 2017

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 330 PM EDT
FOR NORTHEASTERN BERKS...NORTHWESTERN MONTGOMERY...LEHIGH AND WEST
CENTRAL NORTHAMPTON COUNTIES...

At 319 PM EDT, severe thunderstorms were located along a line
extending from Neffs to Ancient Oaks to Topton to near Bechtelsville,
moving east at 35 mph.

HAZARD...60 mph wind gusts. 

SOURCE...Radar indicated. 

IMPACT...Expect damage to trees and power lines. 

These severe storms will be near...
  Allentown, Northampton, Neffs and Coffeetown around 325 PM EDT. 
  Emmaus, East Greenville, Beersville and Zionsville around 330 PM 
  EDT. 

Other locations impacted by these severe thunderstorms include
Macungie, North Catasauqua, Alburtis, Coplay, Fullerton, Catasauqua,
Pennsburg, Hokendauqua, Red Hill and Boyertown.

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 this storm. Move indoors
immediately. Remember...if you can hear thunder...you are close
enough to be struck by lightning.

Torrential rainfall is occurring with these storms, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.

&&

LAT...LON 4043 7579 4055 7578 4070 7573 4077 7547
      4058 7546 4043 7547 4042 7548 4037 7547
      4031 7578 4038 7579
TIME...MOT...LOC 1919Z 254DEG 30KT 4071 7559 4055 7560 4050 7567 4034
7570

TORNADO...POSSIBLE
HAIL...<.75IN
WIND...60MPH
 
$$
Drag

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 19, 12:24 PM EDT	Special Weather Statement	PHI	Monroe	21 min
Jun 19, 12:44 PM EDT	Special Weather Statement	PHI	Carbon	31 min
Jun 19, 12:46 PM EDT	Special Weather Statement	PHI	Berks	29 min
Jun 19, 12:55 PM EDT	Severe Thunderstorm Warning	PHI	Carbon, Monroe	50 min
Jun 19, 1:25 PM EDT	Special Weather Statement	PHI	Lehigh	35 min
Jun 19, 1:29 PM EDT	Areal Flood Advisory	PHI	Berks, Carbon, Lehigh, Monroe, Northampton	4 hr
Jun 19, 1:42 PM EDT	Special Weather Statement	PHI	Berks	63 min
Jun 19, 2:08 PM EDT	Severe Thunderstorm Warning	PHI	Berks	52 min
Jun 19, 2:20 PM EDT	Special Weather Statement	PHI	Northampton	40 min
Jun 19, 2:25 PM EDT	Special Weather Statement	PHI	Berks	50 min
Jun 19, 2:38 PM EDT	Special Weather Statement	PHI	Philadelphia	22 min
Jun 19, 2:43 PM EDT	Special Weather Statement	PHI	Berks, Lehigh, Northampton	47 min
Jun 19, 2:53 PM EDT	Severe Thunderstorm Warning	PHI	Carbon, Monroe	52 min
Jun 19, 2:57 PM EDT	Severe Thunderstorm Warning	PHI	Monroe, Northampton	48 min
Jun 19, 3:08 PM EDT	Severe Thunderstorm Warning	PHI	Berks, Chester, Montgomery	52 min
Jun 19, 3:17 PM EDT	Flash Flood Warning	PHI	Monroe	3 hr
Jun 19, 3:24 PM EDT	Flash Flood Warning	PHI	Carbon, Lehigh, Monroe, Northampton	3 hr
Jun 19, 3:25 PM EDT	Special Weather Statement	PHI	Chester	50 min
Jun 19, 3:35 PM EDT	Areal Flood Advisory	PHI	Berks, Bucks, Chester, Delaware, Montgomery, Philadelphia	3 hr
Jun 19, 3:35 PM EDT	Severe Thunderstorm Warning	PHI	Lehigh, Monroe, Northampton	25 min
Jun 19, 3:53 PM EDT	Severe Thunderstorm Warning	PHI	Monroe, Northampton	37 min
Jun 19, 3:56 PM EDT	Severe Thunderstorm Warning	PHI	Bucks, Northampton	49 min
Jun 19, 4:07 PM EDT	Severe Thunderstorm Warning	PHI	Chester, Delaware, Montgomery	38 min
Jun 19, 4:07 PM EDT	Severe Thunderstorm Warning	PHI	Delaware	38 min
Jun 19, 4:34 PM EDT	Severe Thunderstorm Warning	PHI	Bucks, Chester, Delaware, Montgomery, Philadelphia	41 min
Jun 19, 5:09 PM EDT	Severe Thunderstorm Warning	PHI	Bucks, Philadelphia	51 min

Nearby

Severe Thunderstorm Warnings in Pennsylvania, 2017 Every severe thunderstorm warning in 2017

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.