Alert archive / New Jersey / Severe Thunderstorm Warnings in 2020

Severe Thunderstorm Warning 76, NWS Philadelphia/Mount Holly

June 27, 2020Bucks County, Lehigh County, Northampton County, Pennsylvania; 5 counties in New Jersey

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Jun 27, 2020, 3:37 PM EDT for Bucks County, Lehigh County, Northampton County, Pennsylvania; 5 counties in New Jersey. It was in force for 53 min. 8 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 27, 2020, 3:37 PM EDT (19:37 UTC)
Expired: Jun 27, 2020, 4:30 PM EDT
In force: 53 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon
Hail: 0.75 in
Wind: 70.0 mph

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

The radar

The Philadelphia radar (KDIX), 65 km from the middle of the area, began a volume at 19:38 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 27, 3:48 PM EDT	TSTM WND DMG	Flemington, NJ	DOWNED TREE LIMBS AND POWER LINES NEAR FLEMINGTON. TIME ESTIMATED FROM RADAR.
Jun 27, 3:50 PM EDT	TSTM WND DMG	4 W Allentown, PA	TREE DOWN ON AMHERST ROAD.
Jun 27, 3:50 PM EDT	TSTM WND DMG	Allentown, PA	TREE DOWN ON HAMILTON BLVD IN ALLENTOWN. TIME ESTIMATED FROM RADAR.
Jun 27, 3:54 PM EDT	TSTM WND DMG	Wertsville, NJ	TREES DOWN NEAR WERTSVILLE. TIME ESTIMATED FROM RADAR.
Jun 27, 4:04 PM EDT	TSTM WND DMG	1 Nw Skillman, NJ	TREE AND WIRES DOWN OVER HOLLOW ROAD.
Jun 27, 4:14 PM EDT	TSTM WND DMG	1 Nw Heathcote, NJ	DOWNED TREE CLOSING NJ ROUTE 27 IN BOTH DIRECTIONS JUST NORTH OF ROUTE 618. TIME ESTIMATED FROM RADAR.
Jun 27, 4:17 PM EDT	TSTM WND DMG	South Brunswick, NJ	TREES AND WIRES DOWN IN SOUTH BRUNSWICK. TIME ESTIMATED FROM RADAR.
Jun 27, 4:28 PM EDT	TSTM WND DMG	2 Sw Old Bridge, NJ	DOWNED TREE AND WIRES NEAR JOHN WALL 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
Jun 27, 3:16 PM EDT	Severe Thunderstorm Watch	SPC	5 hr

The nearest sounding before it

Brookhaven, NY (KOKX), launched 12:00Z, 7.6 hours before the alert went out and 168 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 1675 m above ground
0-6 km bulk shear: 30 kt
0-1 km storm-relative helicity: 63 m²/s²
0-3 km storm-relative helicity: 131 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

375 
WUUS51 KPHI 271937
SVRPHI
NJC019-021-023-035-041-PAC017-077-095-272030-
/O.NEW.KPHI.SV.W.0076.200627T1937Z-200627T2030Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mount Holly NJ
337 PM EDT Sat Jun 27 2020

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...
  Northern Mercer County in central New Jersey...
  Southwestern Somerset County in northern New Jersey...
  Southwestern Middlesex County in northern New Jersey...
  East central Lehigh County in eastern Pennsylvania...
  Northern Bucks County in southeastern Pennsylvania...
  South central Northampton County in eastern Pennsylvania...

* Until 430 PM EDT.

* At 337 PM EDT, severe thunderstorms were located along a line
  extending from near Flemington to near Hellertown, moving southeast
  at 50 mph.

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

  SOURCE...Radar indicated.

  IMPACT...Expect considerable tree damage. Damage is likely to 
           mobile homes, roofs, and outbuildings.

* Locations impacted include...
  Allentown, Bethlehem, Old Bridge, East Brunswick, South Brunswick,
  North Brunswick, Ewing, Princeton, Byram, Bedminster, Jamesburg,
  Hellertown, Flemington, Tinicum, Cranbury, Clinton, Pennington, New
  Hope, Hopewell and Ferndale.

This includes the following highways...
 New Jersey Turnpike near exit 9.
 Interstate 78 in Pennsylvania between mile markers 60 and 71.
 Interstate 78 in New Jersey between mile markers 13 and 18.
 Interstate 295 in New Jersey between mile markers 71 and 74.

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.

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

&&

LAT...LON 4036 7431 4030 7439 4028 7500 4061 7555
      4064 7503 4064 7484
TIME...MOT...LOC 1937Z 292DEG 42KT 4053 7493 4053 7537 

HAIL...0.75IN
WIND...70MPH
 
$$

CMS

3 follow-up statements

575 
WWUS51 KPHI 271947
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
347 PM EDT Sat Jun 27 2020

NJC019-021-023-035-041-PAC017-077-095-272030-
/O.CON.KPHI.SV.W.0076.000000T0000Z-200627T2030Z/
Hunterdon NJ-Warren NJ-Mercer NJ-Somerset NJ-Middlesex NJ-Lehigh PA-
Bucks PA-Northampton PA-
347 PM EDT Sat Jun 27 2020

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 430 PM EDT
FOR HUNTERDON...SOUTHWESTERN WARREN...NORTHERN MERCER...SOUTHWESTERN
SOMERSET...SOUTHWESTERN MIDDLESEX...EAST CENTRAL LEHIGH...NORTHERN
BUCKS AND SOUTH CENTRAL NORTHAMPTON COUNTIES...

At 347 PM EDT, severe thunderstorms were located along a line
extending from Cloverhill to near Pleasant Valley, moving east at 50
mph.

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

SOURCE...Law enforcement. Tree damage and power outages have been 
         reported near Allentown.

IMPACT...Expect considerable tree damage. Damage is likely to mobile 
         homes, roofs, and outbuildings.

Locations impacted include...
Allentown, Bethlehem, Old Bridge, East Brunswick, South Brunswick,
North Brunswick, Ewing, Princeton, Byram, Bedminster, Jamesburg,
Hellertown, Flemington, Tinicum, Cranbury, Clinton, Pennington, New
Hope, Hopewell and Ferndale.

This includes the following highways...
 New Jersey Turnpike near exit 9.
 Interstate 78 in Pennsylvania between mile markers 61 and 70.
 Interstate 78 in New Jersey between mile markers 13 and 18.
 Interstate 295 in New Jersey between mile markers 71 and 74.

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.

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

&&

LAT...LON 4036 7431 4030 7439 4028 7500 4060 7552
      4064 7503 4064 7484
TIME...MOT...LOC 1947Z 292DEG 42KT 4049 7480 4049 7524 

TORNADO...POSSIBLE
HAIL...0.75IN
WIND...70MPH
 
$$

JEO

205 
WWUS51 KPHI 272005
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
405 PM EDT Sat Jun 27 2020

NJC041-PAC077-095-272014-
/O.CAN.KPHI.SV.W.0076.000000T0000Z-200627T2030Z/
Warren NJ-Lehigh PA-Northampton PA-
405 PM EDT Sat Jun 27 2020

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHWESTERN WARREN...EAST
CENTRAL 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 Severe Thunderstorm Watch remains in effect until 800 PM EDT for
central, northern and northwestern New Jersey...and southeastern
Pennsylvania.

LAT...LON 4036 7431 4030 7439 4028 7500 4051 7537
      4057 7528 4055 7503 4059 7474
TIME...MOT...LOC 2004Z 292DEG 42KT 4042 7457 4042 7501 

$$

NJC019-021-023-035-PAC017-272030-
/O.CON.KPHI.SV.W.0076.000000T0000Z-200627T2030Z/
Hunterdon NJ-Mercer NJ-Somerset NJ-Middlesex NJ-Bucks PA-
405 PM EDT Sat Jun 27 2020

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

At 404 PM EDT, severe thunderstorms were located along a line
extending from Kendall Park to Stockton, moving east at 50 mph.

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

SOURCE...Law enforcement. Tree damage and power outages were 
         reported earlier near Allentown.

IMPACT...Expect considerable tree damage. Damage is likely to mobile 
         homes, roofs, and outbuildings.

Locations impacted include...
Old Bridge, East Brunswick, South Brunswick, North Brunswick, Ewing,
Princeton, Byram, Bedminster, Jamesburg, Flemington, Tinicum,
Cranbury, Pennington, New Hope, Hopewell, Ferndale, Frenchtown, Rocky
Hill, Stockton and Millstone.

This includes the following highways...
 New Jersey Turnpike near exit 9.
 Interstate 295 in New Jersey between mile markers 71 and 74.

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.

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

&&

LAT...LON 4036 7431 4030 7439 4028 7500 4051 7537
      4057 7528 4055 7503 4059 7474
TIME...MOT...LOC 2004Z 292DEG 42KT 4042 7457 4042 7501 

TORNADO...POSSIBLE
HAIL...0.75IN
WIND...70MPH
 
$$

JEO

858 
WWUS51 KPHI 272022
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
422 PM EDT Sat Jun 27 2020

NJC019-021-023-035-PAC017-272032-
/O.EXP.KPHI.SV.W.0076.000000T0000Z-200627T2030Z/
Hunterdon NJ-Mercer NJ-Somerset NJ-Middlesex NJ-Bucks PA-
422 PM EDT Sat Jun 27 2020

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHERN HUNTERDON...NORTHERN
MERCER...SOUTHWESTERN SOMERSET...SOUTHWESTERN MIDDLESEX AND NORTHERN
BUCKS COUNTIES WILL EXPIRE AT 430 PM EDT...
    
The storms which prompted the warning have moved out of the warned 
area. Therefore, the warning will be allowed to expire.

A Severe Thunderstorm Watch remains in effect until 800 PM EDT for
central, northern and northwestern New Jersey...and southeastern
Pennsylvania.

LAT...LON 4036 7431 4030 7439 4028 7500 4051 7537
      4057 7528 4055 7503 4059 7474
TIME...MOT...LOC 2022Z 292DEG 42KT 4035 7434 4035 7478 

$$

JEO

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 27, 2:51 PM EDT	Special Weather Statement	PHI	Lehigh, Northampton	24 min
Jun 27, 3:01 PM EDT	Severe Thunderstorm Warning	PHI	Bucks, Lehigh, Northampton	44 min
Jun 27, 3:32 PM EDT	Areal Flood Advisory	PHI	Bucks, Lehigh, Northampton	3 hr
Jun 27, 5:22 PM EDT	Special Weather Statement	PHI	Berks	23 min
Jun 27, 5:40 PM EDT	Special Weather Statement	PHI	Bucks	35 min
Jun 27, 4:17 PM EDT	Severe Thunderstorm Warning	PHI	Mercer, Middlesex, Monmouth, Ocean, Somerset	58 min
Jun 27, 4:33 PM EDT	Special Marine Warning	PHI		87 min
Jun 27, 4:51 PM EDT	Special Weather Statement	PHI	Mercer	24 min
Jun 27, 5:12 PM EDT	Areal Flood Advisory	PHI	Burlington, Mercer, Middlesex, Monmouth, Ocean	2 hr
Jun 27, 5:12 PM EDT	Severe Thunderstorm Warning	PHI	Burlington, Mercer, Monmouth, Ocean	48 min
Jun 27, 5:27 PM EDT	Special Marine Warning	PHI		63 min
Jun 27, 5:47 PM EDT	Special Weather Statement	PHI	Mercer	13 min
Jun 27, 6:14 PM EDT	Special Weather Statement	PHI	Cumberland	31 min
Jun 27, 6:54 PM EDT	Special Weather Statement	PHI	Cape May	51 min
Jun 27, 6:58 PM EDT	Special Marine Warning	PHI		32 min
Jun 27, 7:25 PM EDT	Special Marine Warning	PHI		30 min
Jun 27, 7:25 PM EDT	Special Marine Warning	PHI		65 min
Jun 27, 7:27 PM EDT	Special Weather Statement	PHI	Ocean	33 min

Nearby

Severe Thunderstorm Warnings in New Jersey, 2020 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.