Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2022

Severe Thunderstorm Warning 36, NWS Philadelphia/Mount Holly

May 20, 20225 counties in Pennsylvania

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at May 20, 2022, 2:22 PM EDT for 5 counties in Pennsylvania. It was in force for 53 min. 3 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 20, 2022, 2:22 PM EDT (18:22 UTC)
Expired: May 20, 2022, 3:15 PM EDT
In force: 53 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Berks County, PA, Bucks County, PA, Chester County, PA, Lehigh County, PA, Montgomery County, PA

The radar

The Philadelphia radar (KDIX), 110 km from the middle of the area, began a volume at 18:24 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 20, 2:33 PM EDT	HAIL 1	Boyertown, PA	ESTIMATED 55 MPH WIND GUST REPORTED AS WELL.
May 20, 2:33 PM EDT	HAIL 1	Boyertown, PA
May 20, 3:00 PM EDT	TSTM WND DMG	1 Sse Salford Twp, PA	A LARGE TREE LIMB ESTIMATED TO BE OVER 8 INCHES IN DIAMETER TOOK DOWN POWER LINES ALONG THE SOUTHBOUND SIDE OF ALLENTOWN ROAD NEAR GREEN HILL ROAD AND RISING SUN ROAD. 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 20, 11:35 AM EDT	Tornado Watch	SPC	7 hr

The nearest sounding before it

Washington/Dulle, VA (KIAD), launched 12:00Z, 6.4 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: 1 J/kg
Mixed-layer CIN: -226 J/kg
Mixed-layer LCL: 1469 m above ground
0-6 km bulk shear: 34 kt
0-1 km storm-relative helicity: 106 m²/s²
0-3 km storm-relative helicity: 169 m²/s²
Significant tornado parameter: 0.0
Supercell composite: -0.2

Open this sounding in Storm Lab

The text

As transmitted.

497 
WUUS51 KPHI 201822
SVRPHI
PAC011-017-029-077-091-201915-
/O.NEW.KPHI.SV.W.0036.220520T1822Z-220520T1915Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mount Holly NJ
222 PM EDT Fri May 20 2022

The National Weather Service in Mount Holly NJ has issued a

* Severe Thunderstorm Warning for...
  Southeastern Berks County in eastern Pennsylvania...
  Southeastern Lehigh County in eastern Pennsylvania...
  Northwestern Montgomery County in southeastern Pennsylvania...
  West central Bucks County in southeastern Pennsylvania...
  Northern Chester County in southeastern Pennsylvania...

* Until 315 PM EDT.

* At 222 PM EDT, a severe thunderstorm was located near Birdsboro, or
  10 miles east of Reading, 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...
  Pottstown, Emmaus, Souderton, Birdsboro, Hatfield, East Greenville,
  Schwenksville, Bally, Bechtelsville, Green Lane, Zionsville, Spring
  Mount, Geryville, Gilbertsville, Cedarville, Stowe, Telford,
  Sellersville, Boyertown and Pennsburg.

This includes Northeast Extension between mile markers 32 and 51.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Tornado Watch remains in effect until 700 PM EDT for eastern and
southeastern Pennsylvania.

A tornado watch remains in effect for the warned area. Tornadoes can
develop quickly from severe thunderstorms. Although a tornado is not
immediately likely, if one is spotted, act quickly and move to a
place of safety inside a sturdy structure such as a basement or small
interior room.

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

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

A Tornado Watch remains in effect until 700 PM EDT for eastern and
southeastern Pennsylvania.

&&

LAT...LON 4019 7576 4032 7585 4055 7546 4029 7525
TIME...MOT...LOC 1822Z 244DEG 26KT 4029 7574 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

MPS

4 follow-up statements

109 
WWUS51 KPHI 201829
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
229 PM EDT Fri May 20 2022

PAC011-017-029-077-091-201915-
/O.CON.KPHI.SV.W.0036.000000T0000Z-220520T1915Z/
Berks PA-Lehigh PA-Montgomery PA-Bucks PA-Chester PA-
229 PM EDT Fri May 20 2022

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 315 PM EDT
FOR SOUTHEASTERN BERKS...SOUTHEASTERN LEHIGH...NORTHWESTERN
MONTGOMERY...WEST CENTRAL BUCKS AND NORTHERN CHESTER COUNTIES...

At 228 PM EDT, a severe thunderstorm was located near Gilbertsville,
or 13 miles east of Reading, moving northeast at 30 mph.

HAZARD...Ping pong ball size hail and 60 mph wind gusts.

SOURCE...Radar indicated.

IMPACT...People and animals outdoors will be injured. Expect hail 
         damage to roofs, siding, windows, and vehicles. Wind damage 
         to roofs, siding, trees, and power lines is possible.

Locations impacted include...
Pottstown, Quakertown, Souderton, East Greenville, Schwenksville,
Bally, Bechtelsville, Green Lane, Zionsville, Spring Mount,
Geryville, Gilbertsville, Cedarville, Stowe, Telford, Sellersville,
Boyertown, Pennsburg, Red Hill and Trumbauersville.

This includes Northeast Extension between mile markers 34 and 50.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Tornado Watch remains in effect until 700 PM EDT for eastern and
southeastern Pennsylvania.

A tornado watch remains in effect for the warned area. Tornadoes can
develop quickly from severe thunderstorms. Although a tornado is not
immediately likely, if one is spotted act quickly and move to a place
of safety inside a sturdy structure, such as a basement or small
interior room.

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

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

&&

LAT...LON 4020 7571 4034 7581 4043 7567 4053 7544
      4032 7527 4022 7559
TIME...MOT...LOC 1828Z 244DEG 26KT 4031 7568 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.50 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

MPS

734 
WWUS51 KPHI 201844
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
244 PM EDT Fri May 20 2022

PAC029-077-201853-
/O.CAN.KPHI.SV.W.0036.000000T0000Z-220520T1915Z/
Lehigh PA-Chester PA-
244 PM EDT Fri May 20 2022

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN LEHIGH AND
NORTHERN CHESTER COUNTIES IS CANCELLED...
    
The severe thunderstorm which prompted the warning has moved out of 
the warned area. Therefore, the warning has been cancelled.

A Tornado Watch remains in effect until 700 PM EDT for eastern and
southeastern Pennsylvania.

LAT...LON 4039 7567 4043 7550 4042 7549 4044 7547
      4046 7537 4032 7527 4022 7559 4024 7560
      4022 7561 4024 7564
TIME...MOT...LOC 1843Z 260DEG 24KT 4032 7555 

$$

PAC011-017-091-201915-
/O.CON.KPHI.SV.W.0036.000000T0000Z-220520T1915Z/
Berks PA-Montgomery PA-Bucks PA-
244 PM EDT Fri May 20 2022

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 315 PM EDT
FOR EAST CENTRAL BERKS...NORTHWESTERN MONTGOMERY AND WEST CENTRAL
BUCKS COUNTIES...

At 243 PM EDT, a severe thunderstorm was located over Gilbertsville,
or 19 miles east of Reading, 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...
Pottstown, Quakertown, Perkasie, Souderton, East Greenville,
Schwenksville, Bally, Bechtelsville, Green Lane, Geryville, Spring
Mount, Gilbertsville, Telford, Sellersville, Boyertown, Pennsburg,
Red Hill, Trumbauersville, Pottsgrove and Sanatoga.

This includes Northeast Extension between mile markers 34 and 44.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Tornado Watch remains in effect until 700 PM EDT for eastern and
southeastern Pennsylvania.

A tornado watch remains in effect for the warned area. Tornadoes can
develop quickly from severe thunderstorms. Although a tornado is not
immediately likely, if one is spotted act quickly and move to a place
of safety inside a sturdy structure, such as a basement or small
interior room.

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

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

&&

LAT...LON 4039 7567 4043 7550 4042 7549 4044 7547
      4046 7537 4032 7527 4022 7559 4024 7560
      4022 7561 4024 7564
TIME...MOT...LOC 1843Z 260DEG 24KT 4032 7555 

HAIL THREAT...OBSERVED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

MPS

385 
WWUS51 KPHI 201856
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
256 PM EDT Fri May 20 2022

PAC011-201906-
/O.CAN.KPHI.SV.W.0036.000000T0000Z-220520T1915Z/
Berks PA-
256 PM EDT Fri May 20 2022

...THE SEVERE THUNDERSTORM WARNING FOR EAST CENTRAL BERKS COUNTY IS
CANCELLED...
    
The severe thunderstorm which prompted the warning has moved out of 
the warned area. Therefore, the warning has been cancelled.

A Tornado Watch remains in effect until 700 PM EDT for southeastern
Pennsylvania.

LAT...LON 4025 7549 4040 7553 4044 7536 4032 7527
TIME...MOT...LOC 1856Z 257DEG 30KT 4033 7542 

$$

PAC017-091-201915-
/O.CON.KPHI.SV.W.0036.000000T0000Z-220520T1915Z/
Montgomery PA-Bucks PA-
256 PM EDT Fri May 20 2022

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 315 PM EDT
FOR NORTH CENTRAL MONTGOMERY AND WEST CENTRAL BUCKS COUNTIES...

At 256 PM EDT, a severe thunderstorm was located over Green Lane, or
18 miles south of Allentown, moving east at 35 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...
Quakertown, Perkasie, Souderton, East Greenville, Schwenksville,
Green Lane, Spring Mount, Telford, Sellersville, Pennsburg, Red Hill,
Trumbauersville and Harleysville.

This includes Northeast Extension between mile markers 34 and 42.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Tornado Watch remains in effect until 700 PM EDT for southeastern
Pennsylvania.

A tornado watch remains in effect for the warned area. Tornadoes can
develop quickly from severe thunderstorms. Although a tornado is not
immediately likely, if one is spotted act quickly and move to a place
of safety inside a sturdy structure, such as a basement or small
interior room.

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

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

&&

LAT...LON 4025 7549 4040 7553 4044 7536 4032 7527
TIME...MOT...LOC 1856Z 257DEG 30KT 4033 7542 

HAIL THREAT...OBSERVED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

MPS

380 
WWUS51 KPHI 201906
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
306 PM EDT Fri May 20 2022

PAC017-091-201915-
/O.EXP.KPHI.SV.W.0036.000000T0000Z-220520T1915Z/
Montgomery PA-Bucks PA-
306 PM EDT Fri May 20 2022

...THE SEVERE THUNDERSTORM WARNING FOR NORTH CENTRAL MONTGOMERY AND
WEST CENTRAL BUCKS COUNTIES WILL EXPIRE AT 315 PM EDT...
        
The storm which prompted the warning has moved out of the area.
Therefore, the warning will be allowed to expire.  However small hail
and gusty winds are still possible with this thunderstorm.

A Tornado Watch remains in effect until 700 PM EDT for 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.

Remember, a Severe Thunderstorm Warning still remains in effect for 
portions of Montgomery and Bucks counties.

LAT...LON 4025 7549 4040 7553 4044 7536 4032 7527
TIME...MOT...LOC 1905Z 244DEG 26KT 4035 7536 

$$

MPS

The office that day

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

Issued	Product	Office	Counties	Lasted
May 20, 3:15 AM EDT	Heat Advisory	PHI	Bucks, Chester, Delaware, Montgomery, Philadelphia	59 hr
May 20, 1:45 PM EDT	Severe Thunderstorm Warning	PHI	Berks, Chester, Montgomery	45 min
May 20, 2:27 PM EDT	Severe Thunderstorm Warning	PHI	Chester, Delaware, Montgomery, Philadelphia	48 min
May 20, 2:30 PM EDT	Severe Thunderstorm Warning	PHI	Berks	45 min
May 20, 2:53 PM EDT	Severe Thunderstorm Warning	PHI	Berks, Lehigh, Montgomery	52 min
May 20, 3:00 PM EDT	Severe Thunderstorm Warning	PHI	Delaware, Philadelphia	31 min
May 20, 3:05 PM EDT	Severe Thunderstorm Warning	PHI	Bucks, Montgomery	29 min
May 20, 3:10 PM EDT	Severe Thunderstorm Warning	PHI	Berks, Bucks, Chester, Lehigh, Montgomery	50 min
May 20, 3:25 PM EDT	Severe Thunderstorm Warning	PHI	Berks, Carbon, Lehigh, Monroe, Northampton	50 min
May 20, 3:28 PM EDT	Special Weather Statement	PHI	Philadelphia	32 min
May 20, 3:37 PM EDT	Severe Thunderstorm Warning	PHI	Bucks, Chester, Delaware, Montgomery, Philadelphia	53 min
May 20, 3:41 PM EDT	Severe Thunderstorm Warning Considerable damage threat	PHI	Bucks, Lehigh, Montgomery, Northampton	49 min
May 20, 3:52 PM EDT	Areal Flood Advisory	PHI	Bucks, Chester, Delaware, Lehigh, Montgomery, Philadelphia	3 hr
May 20, 3:55 PM EDT	Areal Flood Advisory	PHI	Berks, Bucks, Carbon, Chester, Lehigh, Monroe and 2 more	3 hr
May 20, 4:26 PM EDT	Areal Flood Advisory	PHI	Bucks, Philadelphia	3 hr
May 20, 5:37 PM EDT	Areal Flood Warning	PHI	Bucks, Montgomery	68 min

Nearby

Severe Thunderstorm Warnings in Pennsylvania, 2022 Every severe thunderstorm warning in 2022

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.