Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2020

Severe Thunderstorm Warning 156, NWS Philadelphia/Mount Holly

July 22, 20204 counties in Pennsylvania

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Jul 22, 2020, 4:10 PM EDT for 4 counties in Pennsylvania. It was in force for 65 min. 12 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: Jul 22, 2020, 4:10 PM EDT (20:10 UTC)
Expired: Jul 22, 2020, 5:15 PM EDT
In force: 65 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, Lehigh County, PA, Northampton County, PA

The radar

The Philadelphia radar (KDIX), 143 km from the middle of the area, began a volume at 20:11 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
Jul 22, 4:17 PM EDT	TSTM WND DMG	1 Wsw Hamburg, PA	DOWNED WIRES NEAR STATE STREET IN WEST HAMBURG. TIME ESTIMATED FROM RADAR.
Jul 22, 4:26 PM EDT	TSTM WND DMG	3 S Lynn Twp, PA	DOWNED TREE ON ROUTE 863 NEAR KISTLER VALLEY ROAD. TIME ESTIMATED FROM RADAR.
Jul 22, 4:28 PM EDT	TSTM WND DMG	1 Ssw East Penn Twp, PA	DOWNED TREES AND WIRES NEAR BAKE OVEN ROAD IN EAST PENN TWP. TIME ESTIMATED FROM RADAR.
Jul 22, 4:29 PM EDT	TSTM WND DMG	2 Wnw Washington Twp, PA	DOWNED TREES AND WIRES NEAR SWAMP HOLLOW ROAD IN WASHINGTON TWP. TIME ESTIMATED FROM RADAR.
Jul 22, 4:30 PM EDT	TSTM WND DMG	2 Nw Richmond Twp, PA	DOWNED TREE ON MOSELEM SPRINGS RD. TIME ESTIMATED FROM RADAR.
Jul 22, 4:49 PM EDT	TSTM WND DMG	2 Ssw Claussville, PA	DOWNED WIRES ON SEIPSTOWN ROAD IN SEIPSTOWN. TIME ESTIMATED FROM RADAR.
Jul 22, 4:51 PM EDT	TSTM WND DMG	1 Ne Delps, PA	DOWNED TREES AND WIRES NEAR WABASSO AVENUE IN DELPS. TIME ESTIMATED FROM RADAR.
Jul 22, 4:51 PM EDT	TSTM WND DMG	2 Wsw Bushkill Twp, PA	SEVERAL REPORTS OF TREES AND WIRES DOWN WEST OF BELFAST IN THE BUSHKILL TWP AREA, WITH NUMEROUS POWER OUTAGES AND A FEW ROAD CLOSURES IN THE AREA. TIME ESTIMATED FROM RADAR.
Jul 22, 4:51 PM EDT	TSTM WND DMG	2 Wsw Bushkill Twp, PA	DOWNED TREES AND WIRES NEAR BUSHKILL DRIVE IN BUSHKILL TWP. TIME ESTIMATED FROM RADAR.
Jul 22, 4:54 PM EDT	TSTM WND DMG	2 Nw Breinigsville, PA	DOWNED TREE AND WIRES NEAR ARROWHEAD LANE NEAR BREINIGSVILLE. TIME ESTIMATED FROM RADAR.
Jul 22, 5:01 PM EDT	TSTM WND DMG	3 Wsw West Catasauqua, PA	DOWNED TREES AND WIRES NEAR LAPP ROAD IN STETLERSVILLE. TIME ESTIMATED FROM RADAR.
Jul 22, 5:06 PM EDT	TSTM WND DMG	North Catasauqua, PA	DOWNED WIRES NEAR CLOVER STREET IN NORTH CATASAUQUA. 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
Jul 22, 2:57 PM EDT	Severe Thunderstorm Watch	SPC	7 hr

The nearest sounding before it

Washington/Dulle, VA (KIAD), launched 12:00Z, 8.2 hours before the alert went out and 237 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: 248 J/kg
Mixed-layer CIN: -214 J/kg
Mixed-layer LCL: 1163 m above ground
0-6 km bulk shear: 18 kt
0-1 km storm-relative helicity: 20 m²/s²
0-3 km storm-relative helicity: 44 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

746 
WUUS51 KPHI 222010
SVRPHI
PAC011-025-077-095-222115-
/O.NEW.KPHI.SV.W.0156.200722T2010Z-200722T2115Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mount Holly NJ
410 PM EDT Wed Jul 22 2020

The National Weather Service in Mount Holly NJ has issued a

* Severe Thunderstorm Warning for...
  Northeastern Berks County in eastern Pennsylvania...
  Lehigh County in eastern Pennsylvania...
  Southeastern Carbon County in northeastern Pennsylvania...
  West central Northampton County in eastern Pennsylvania...

* Until 515 PM EDT.

* At 409 PM EDT, severe thunderstorms were located along a line
  extending from Lehighton to near Hamburg, moving east at 15 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, Lehighton, Northampton, Palmerton, Kutztown, Jim Thorpe,
  Hamburg, Slatington, Bath, Walnutport, Topton, Shoemakersville,
  Lyons, Lenhartsville, New Mahoning, Neffs, Coffeetown, New Tripoli,
  Berlinsville and Emerald.

This includes the following highways...
 Northeast Extension between mile markers 57 and 79.
 Interstate 78 in Pennsylvania between mile markers 26 and 54.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Protecting yourself from immediate threats to life and safety shall
take priority.  Whenever possible, as long as it does not cause
greater harm, all COVID-19 protective action guidance should be
followed.

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 4058 7606 4058 7601 4065 7598 4070 7583
      4074 7576 4081 7586 4091 7576 4083 7548
      4081 7547 4082 7543 4079 7532 4048 7567
      4050 7603 4054 7611
TIME...MOT...LOC 2009Z 281DEG 14KT 4084 7571 4053 7606 

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

CMS

3 follow-up statements

089 
WWUS51 KPHI 222031
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
431 PM EDT Wed Jul 22 2020

PAC011-025-077-095-222115-
/O.CON.KPHI.SV.W.0156.000000T0000Z-200722T2115Z/
Berks PA-Lehigh PA-Carbon PA-Northampton PA-
431 PM EDT Wed Jul 22 2020

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 515 PM EDT
FOR NORTHEASTERN BERKS...LEHIGH...SOUTHEASTERN CARBON AND WEST
CENTRAL NORTHAMPTON COUNTIES...

At 431 PM EDT, severe thunderstorms were located along a line
extending from Palmerton to Shoemakersville, moving east at 15 mph.

HAZARD...70 mph wind gusts and quarter size hail.

SOURCE...Law enforcement.

IMPACT...Minor damage to vehicles is possible. Expect considerable 
         tree damage. Wind damage is also likely to mobile homes, 
         roofs, and outbuildings.

Locations impacted include...
Allentown, Lehighton, Northampton, Palmerton, Kutztown, Hamburg,
Slatington, Bath, Walnutport, Topton, Shoemakersville, Lyons,
Lenhartsville, Neffs, Coffeetown, New Tripoli, Berlinsville, Emerald,
Claussville and Danielsville.

This includes the following highways...
 Northeast Extension between mile markers 57 and 78.
 Interstate 78 in Pennsylvania between mile markers 33 and 54.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Protecting yourself from immediate threats to life and safety shall
take priority.  Whenever possible, as long as it does not cause
greater harm, all COVID-19 protective action guidance should be
followed.

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

Frequent 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 4070 7583 4074 7576 4078 7581 4088 7568
      4083 7548 4081 7547 4082 7543 4079 7532
      4048 7567 4050 7603
TIME...MOT...LOC 2031Z 281DEG 14KT 4082 7561 4051 7596 

HAIL...1.00IN
WIND...70MPH
 
$$

CMS

441 
WWUS51 KPHI 222059
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
459 PM EDT Wed Jul 22 2020

PAC011-025-077-095-222115-
/O.CON.KPHI.SV.W.0156.000000T0000Z-200722T2115Z/
Berks PA-Lehigh PA-Carbon PA-Northampton PA-
459 PM EDT Wed Jul 22 2020

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 515 PM EDT
FOR NORTHEASTERN BERKS...CENTRAL LEHIGH...SOUTHEASTERN CARBON AND
WEST CENTRAL NORTHAMPTON COUNTIES...

At 458 PM EDT, severe thunderstorms were located along a line
extending from near Kunkletown to Lyons, moving east at 15 mph.

HAZARD...70 mph wind gusts and quarter size hail.

SOURCE...Law enforcement. Several reports of wind damage have been 
         received from western portions of Lehigh County with these 
         storms.

IMPACT...Minor damage to vehicles is possible. Expect considerable 
         tree damage. Wind damage is also likely to mobile homes, 
         roofs, and outbuildings.

Locations impacted include...
Allentown, Northampton, Palmerton, Kutztown, Slatington, Bath,
Walnutport, Topton, Neffs, Coffeetown, Berlinsville, Emerald,
Claussville, Danielsville, Jordan Valley, Beersville, Schnecksville,
Ancient Oaks, Catasauqua and Coplay.

This includes the following highways...
 Northeast Extension between mile markers 57 and 72.
 Interstate 78 in Pennsylvania between mile markers 43 and 54.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Protecting yourself from immediate threats to life and safety shall
take priority.  Whenever possible, as long as it does not cause
greater harm, all COVID-19 protective action guidance should be
followed.

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

Frequent 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 4071 7573 4086 7561 4083 7548 4081 7547
      4082 7543 4079 7532 4048 7567 4049 7582
TIME...MOT...LOC 2058Z 277DEG 14KT 4080 7543 4049 7578 

HAIL...1.00IN
WIND...70MPH
 
$$

CMS

048 
WWUS51 KPHI 222111
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
511 PM EDT Wed Jul 22 2020

PAC011-025-077-095-222121-
/O.EXP.KPHI.SV.W.0156.000000T0000Z-200722T2115Z/
Berks PA-Lehigh PA-Carbon PA-Northampton PA-
511 PM EDT Wed Jul 22 2020

...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN BERKS...CENTRAL
LEHIGH...SOUTHEASTERN CARBON AND WEST CENTRAL NORTHAMPTON COUNTIES
WILL EXPIRE AT 515 PM EDT...
    
The storms which prompted the warning have moved out of the area.
Therefore, the warning will be allowed to expire.  However, gusty 
winds and heavy rain are still possible with these thunderstorms.

A Severe Thunderstorm Watch remains in effect until 1000 PM EDT for
eastern and northeastern Pennsylvania.

LAT...LON 4071 7573 4086 7561 4083 7548 4081 7547
      4082 7543 4079 7532 4048 7567 4049 7582
TIME...MOT...LOC 2111Z 281DEG 14KT 4079 7538 4048 7573 

$$

CMS

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 21, 8:45 PM EDT	Special Weather Statement	PHI	Berks	30 min
Jul 21, 9:20 PM EDT	Special Weather Statement	PHI	Montgomery	25 min
Jul 22, 1:36 PM EDT	Special Weather Statement	PHI	Carbon	24 min
Jul 22, 1:58 PM EDT	Special Weather Statement	PHI	Monroe	32 min
Jul 22, 2:10 PM EDT	Severe Thunderstorm Warning	PHI	Monroe, Northampton	50 min
Jul 22, 3:29 PM EDT	Special Weather Statement	PHI	Lebanon	46 min
Jul 22, 3:39 PM EDT	Severe Thunderstorm Warning	PHI	Berks	51 min
Jul 22, 4:01 PM EDT	Severe Thunderstorm Warning	PHI	Chester	22 min
Jul 22, 4:25 PM EDT	Severe Thunderstorm Warning	PHI	Berks, Bucks, Chester, Lehigh, Montgomery	50 min
Jul 22, 4:38 PM EDT	Severe Thunderstorm Warning	PHI	Chester	52 min
Jul 22, 4:49 PM EDT	Severe Thunderstorm Warning	PHI	Berks, Bucks, Carbon, Lehigh, Monroe, Northampton	56 min
Jul 22, 5:09 PM EDT	Severe Thunderstorm Warning	PHI	Berks, Bucks, Chester, Delaware, Lehigh, Montgomery and 1 more	66 min
Jul 22, 5:16 PM EDT	Severe Thunderstorm Warning	PHI	Bucks, Monroe, Northampton	59 min
Jul 22, 5:23 PM EDT	Areal Flood Advisory	PHI	Northampton	3 hr
Jul 22, 5:33 PM EDT	Severe Thunderstorm Warning	PHI	Chester, Delaware, Montgomery, Philadelphia	57 min
Jul 22, 5:40 PM EDT	Severe Thunderstorm Warning	PHI	Bucks, Montgomery, Philadelphia	65 min

Nearby

Severe Thunderstorm Warnings in Pennsylvania, 2020 Every severe thunderstorm warning in 2020

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.