Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2022

Severe Thunderstorm Warning 45, NWS Philadelphia/Mount Holly

May 20, 20224 counties in Pennsylvania; 4 counties in New Jersey

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at May 20, 2022, 3:41 PM EDT for 4 counties in Pennsylvania; 4 counties in New Jersey. It was in force for 49 min. 1 report 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, 3:41 PM EDT (19:41 UTC)
Expired: May 20, 2022, 4:30 PM EDT
In force: 49 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon
Damage threat: Considerable
Hail: 1.0 in
Wind: 70.0 mph

Counties Hunterdon County, NJ, Mercer County, NJ, Somerset County, NJ, Warren County, NJ, Bucks County, PA, Lehigh County, PA, Montgomery County, PA, Northampton County, PA

The radar

The Philadelphia radar (KDIX), 80 km from the middle of the area, began a volume at 19:43 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, 4:18 PM EDT	TSTM WND DMG	1 Se Furlong, PA	TREES DOWN.

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, 7.7 hours before the alert went out and 260 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.

114 
WUUS51 KPHI 201941
SVRPHI
NJC019-021-035-041-PAC017-077-091-095-202030-
/O.NEW.KPHI.SV.W.0045.220520T1941Z-220520T2030Z/

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

The National Weather Service in Mount Holly NJ has issued a

* Severe Thunderstorm Warning for...
  Hunterdon County in northwestern New Jersey...
  Southwestern Warren County in northwestern New Jersey...
  Northwestern Mercer County in central New Jersey...
  Southwestern Somerset County in northern New Jersey...
  Southeastern Lehigh County in eastern Pennsylvania...
  Northeastern Montgomery County in southeastern Pennsylvania...
  Bucks County in southeastern Pennsylvania...
  South central Northampton County in eastern Pennsylvania...

* Until 430 PM EDT.

* At 340 PM EDT, severe thunderstorms were located along a line
  extending from near Emmaus to near Green Lane to Trappe, moving
  east at 50 mph.

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

  SOURCE...Radar indicated.

  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, Trenton, Bethlehem, Ewing, Lansdale, Princeton, Emmaus,
  Quakertown, Perkasie, Doylestown, Byram, Souderton, Bedminster,
  Hellertown, Flemington, Chalfont, Tinicum, High Bridge, Hatfield
  and East Greenville.

This includes the following highways...
 Northeast Extension between mile markers 28 and 55.
 Interstate 78 in Pennsylvania between mile markers 56 and 71.
 Interstate 78 in New Jersey near mile marker 2, and between mile
markers 7 and 25.
 Interstate 295 in New Jersey between mile markers 64 and 76.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Tornado Watch remains in effect until 700 PM EDT for central,
northern and northwestern New Jersey...and eastern and southeastern
Pennsylvania.

Prepare immediately for large hail and damaging winds. People outside
should move immediately to shelter inside a strong building. Stay
away from windows.

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

A Tornado Watch remains in effect until 700 PM EDT for central,
northern and northwestern New Jersey...and eastern and southeastern
Pennsylvania.

&&

LAT...LON 4073 7478 4038 7463 4023 7470 4021 7554
      4033 7549 4057 7558
TIME...MOT...LOC 1940Z 265DEG 42KT 4056 7546 4034 7540 4022 7546 

THUNDERSTORM DAMAGE THREAT...CONSIDERABLE
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...70 MPH

$$

Staarmann

2 follow-up statements

551 
WWUS51 KPHI 202006
SVSPHI

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

NJC041-PAC077-095-202016-
/O.CAN.KPHI.SV.W.0045.000000T0000Z-220520T2030Z/
Warren NJ-Lehigh PA-Northampton PA-
406 PM EDT Fri May 20 2022

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHWESTERN WARREN...
SOUTHEASTERN LEHIGH AND SOUTH CENTRAL NORTHAMPTON COUNTIES IS
CANCELLED...

The storms which prompted the warning have moved out of the warned 
area. Therefore, the warning has been cancelled.

A Tornado Watch remains in effect until 700 PM EDT for central,
northern and northwestern New Jersey...and southeastern Pennsylvania.

LAT...LON 4073 7478 4038 7463 4023 7470 4022 7532
      4036 7523 4051 7534
TIME...MOT...LOC 2006Z 264DEG 42KT 4053 7507 4037 7501 4025 7510 

$$

NJC019-021-035-PAC017-091-202030-
/O.CON.KPHI.SV.W.0045.000000T0000Z-220520T2030Z/
Hunterdon NJ-Mercer NJ-Somerset NJ-Montgomery PA-Bucks PA-
406 PM EDT Fri May 20 2022

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 430 PM EDT
FOR HUNTERDON...NORTHWESTERN MERCER...SOUTHWESTERN SOMERSET...EAST
CENTRAL MONTGOMERY AND CENTRAL BUCKS COUNTIES...

At 406 PM EDT, severe thunderstorms were located along a line
extending from Frenchtown to near New Hope to near Ivyland, moving
east at 50 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...
Trenton, Ewing, Lansdale, Princeton, Doylestown, Byram, Bedminster,
Flemington, Chalfont, Tinicum, High Bridge, Clinton, Pennington, New
Hope, Yardley, Newtown, Dublin, Hopewell, Ferndale and Frenchtown.

This includes the following highways...
 Interstate 78 in New Jersey between mile markers 12 and 25.
 Interstate 295 in New Jersey between mile markers 64 and 76.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Tornado Watch remains in effect until 700 PM EDT for central,
northern and northwestern New Jersey...and southeastern Pennsylvania.

Prepare immediately for large hail and damaging winds. People outside
should seek shelter inside a well-built structure and away from
windows.

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

&&

LAT...LON 4073 7478 4038 7463 4023 7470 4022 7532
      4036 7523 4051 7534
TIME...MOT...LOC 2006Z 264DEG 42KT 4053 7507 4037 7501 4025 7510 

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

$$

Staarmann

797 
WWUS51 KPHI 202020
SVSPHI

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

PAC091-202029-
/O.CAN.KPHI.SV.W.0045.000000T0000Z-220520T2030Z/
Montgomery PA-
420 PM EDT Fri May 20 2022

...THE SEVERE THUNDERSTORM WARNING FOR EAST CENTRAL MONTGOMERY COUNTY
IS CANCELLED...

The storms which prompted the warning have moved out of the warned 
area. Therefore, the warning has been cancelled.

A Tornado Watch remains in effect until 700 PM EDT for central,
northern and northwestern New Jersey...and southeastern Pennsylvania.

LAT...LON 4073 7478 4038 7463 4023 7470 4023 7512
      4041 7505 4055 7512
TIME...MOT...LOC 2019Z 264DEG 41KT 4054 7489 4038 7485 4026 7492 

$$

NJC019-021-035-PAC017-202030-
/O.CON.KPHI.SV.W.0045.000000T0000Z-220520T2030Z/
Hunterdon NJ-Mercer NJ-Somerset NJ-Bucks PA-
420 PM EDT Fri May 20 2022

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 430 PM EDT
FOR HUNTERDON...NORTHWESTERN MERCER...SOUTHWESTERN SOMERSET AND
CENTRAL BUCKS COUNTIES...

At 419 PM EDT, severe thunderstorms were located along a line
extending from near Flemington to near Hopewell to near Newtown,
moving east at 45 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...
Trenton, Ewing, Princeton, Flemington, High Bridge, Clinton,
Pennington, New Hope, Yardley, Hopewell, Frenchtown, Lebanon,
Milford, Rocky Hill, Stockton, Washington Crossing, Skillman,
Lumberville, Woodside and Sergeantsville.

This includes the following highways...
 Interstate 78 in New Jersey between mile markers 15 and 25.
 Interstate 295 in New Jersey between mile markers 64 and 76.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Tornado Watch remains in effect until 700 PM EDT for central,
northern and northwestern New Jersey...and southeastern Pennsylvania.

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

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

&&

LAT...LON 4073 7478 4038 7463 4023 7470 4023 7512
      4041 7505 4055 7512
TIME...MOT...LOC 2019Z 264DEG 41KT 4054 7489 4038 7485 4026 7492 

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

$$

Staarmann

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, 2:22 PM EDT	Severe Thunderstorm Warning	PHI	Berks, Bucks, Chester, Lehigh, Montgomery	53 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, 3:52 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
May 20, 12:30 PM EDT	Marine Dense Fog Advisory	PHI		6 hr
May 20, 3:48 PM EDT	Special Weather Statement	PHI	Monmouth	27 min
May 20, 4:11 PM EDT	Special Weather Statement	PHI	Sussex	34 min
May 20, 4:32 PM EDT	Special Weather Statement	PHI	Mercer, Middlesex	28 min
May 20, 4:33 PM EDT	Severe Thunderstorm Warning	PHI	Burlington, Camden, Ocean	42 min
May 20, 4:56 PM EDT	Special Weather Statement	PHI	Middlesex, Monmouth	49 min
May 20, 5:11 PM EDT	Severe Thunderstorm Warning Considerable damage threat	PHI	Burlington, Camden, Ocean	64 min
May 20, 5:15 PM EDT	Special Marine Warning	PHI		45 min
May 20, 5:20 PM EDT	Severe Thunderstorm Warning	PHI	Monmouth, Ocean	27 min
May 20, 5:51 PM EDT	Special Marine Warning	PHI		32 min
May 20, 5:54 PM EDT	Severe Thunderstorm Warning	PHI	Ocean	28 min

Nearby

Severe Thunderstorm Warnings in Pennsylvania, 2022 Severe Thunderstorm Warnings in New Jersey, 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.