Alert archive / New Jersey / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 114, NWS Philadelphia/Mount Holly

July 1, 20218 counties in New Jersey; Bucks County, Philadelphia County, Pennsylvania

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Jul 1, 2021, 4:59 PM EDT for 8 counties in New Jersey; Bucks County, Philadelphia County, Pennsylvania. It was in force for 46 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: Jul 1, 2021, 4:59 PM EDT (20:59 UTC)
Expired: Jul 1, 2021, 5:45 PM EDT
In force: 46 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

Counties Burlington County, NJ, Camden County, NJ, Gloucester County, NJ, Mercer County, NJ, Middlesex County, NJ, Monmouth County, NJ, Salem County, NJ, Somerset County, NJ, Bucks County, PA, Philadelphia County, PA

The radar

The Philadelphia radar (KDIX), 36 km from the middle of the area, began a volume at 21:00 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 1, 4:59 PM EDT	TSTM WND DMG	1 Se Fairless Hills, PA	SEVERAL REPORTS OF DOWNED POWER LINES NEAR FAIRLESS HILLS. TIME ESTIMATED FROM RADAR.
Jul 1, 5:19 PM EDT	TSTM WND DMG	2 Wsw Yardville, NJ	DOWNED WIRES ON GRAND AVENUE. TIME ESTIMATED FROM RADAR.
Jul 1, 5:27 PM EDT	TSTM WND DMG	2 E North Hanover Twp, NJ	WIRES DOWN NEAR CROSSWICK CREEK STREAM VALLEY IN CREAM RIDGE. 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 1, 12:46 PM EDT	Severe Thunderstorm Watch	SPC	7 hr

The nearest sounding before it

Brookhaven, NY (KOKX), launched 12:00Z, 9.0 hours before the alert went out and 196 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: 286 J/kg
Mixed-layer CIN: -126 J/kg
Mixed-layer LCL: 978 m above ground
0-6 km bulk shear: 38 kt
0-1 km storm-relative helicity: 22 m²/s²
0-3 km storm-relative helicity: 84 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.1

Open this sounding in Storm Lab

The text

As transmitted.

149 
WUUS51 KPHI 012059
SVRPHI
NJC005-007-015-021-023-025-033-035-PAC017-101-012145-
/O.NEW.KPHI.SV.W.0114.210701T2059Z-210701T2145Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mount Holly NJ
459 PM EDT Thu Jul 1 2021

The National Weather Service in Mount Holly NJ has issued a

* Severe Thunderstorm Warning for...
  East central Salem County in southern New Jersey...
  Camden County in southern New Jersey...
  Mercer County in central New Jersey...
  Central Gloucester County in southern New Jersey...
  Northwestern Burlington County in southern New Jersey...
  South central Somerset County in northern New Jersey...
  Southwestern Monmouth County in central New Jersey...
  Southwestern Middlesex County in northern New Jersey...
  Southeastern Bucks County in southeastern Pennsylvania...
  Northeastern Philadelphia County in southeastern Pennsylvania...

* Until 545 PM EDT.

* At 459 PM EDT, severe thunderstorms were located along a line
  extending from Pennington to near Woodstown, moving east at 30 mph.

  HAZARD...60 mph wind gusts.

  SOURCE...Radar indicated.

  IMPACT...Damage to roofs, siding, trees, and power lines is 
           possible.

* Locations impacted include...
  Philadelphia, Trenton, Camden, Gloucester City, Cherry Hill, Old
  Bridge, Bensalem, East Brunswick, Evesham, South Brunswick, Mount
  Laurel, Ewing, Willingboro, Deptford, Voorhees, Medford, Glassboro,
  Lindenwold, Lumberton and Princeton.

This includes the following highways...
 New Jersey Turnpike between exits 3 and 9.
 Pennsylvania Turnpike between mile markers 351 and 359.
 Interstate 95 in Pennsylvania between mile markers 29 and 40.
 Interstate 76 in New Jersey between mile markers 0 and 2.
 Interstate 195 in New Jersey between mile markers 0 and 12.
 Interstate 295 in New Jersey between mile markers 25 and 76.
 Interstate 676 in New Jersey near mile marker 0.
 Atlantic City Expressway between mile markers 30 and 44.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3963 7485 3960 7489 3956 7532 4038 7484
      4040 7480 4043 7432
TIME...MOT...LOC 2059Z 263DEG 26KT 4035 7479 3961 7527 

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

CMS

1 follow-up statement

793 
WWUS51 KPHI 012120
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
520 PM EDT Thu Jul 1 2021

NJC033-PAC101-012130-
/O.CAN.KPHI.SV.W.0114.000000T0000Z-210701T2145Z/
Salem NJ-Philadelphia PA-
520 PM EDT Thu Jul 1 2021

...THE SEVERE THUNDERSTORM WARNING FOR EAST CENTRAL SALEM AND
NORTHEASTERN PHILADELPHIA 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
southern, central and northern New Jersey...and southeastern
Pennsylvania.

LAT...LON 3963 7485 3960 7489 3958 7509 3961 7511
      4040 7472 4043 7432
TIME...MOT...LOC 2120Z 261DEG 21KT 4037 7453 3966 7493 

$$

NJC005-007-015-021-023-025-035-PAC017-012145-
/O.CON.KPHI.SV.W.0114.000000T0000Z-210701T2145Z/
Camden NJ-Mercer NJ-Gloucester NJ-Burlington NJ-Somerset NJ-
Monmouth NJ-Middlesex NJ-Bucks PA-
520 PM EDT Thu Jul 1 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 545 PM EDT
FOR EASTERN CAMDEN...MERCER...SOUTHEASTERN GLOUCESTER...NORTHWESTERN
BURLINGTON...SOUTH CENTRAL SOMERSET...SOUTHWESTERN MONMOUTH...
SOUTHWESTERN MIDDLESEX AND SOUTHEASTERN BUCKS COUNTIES...

At 520 PM EDT, severe thunderstorms were located along a line
extending from Dayton to near Monroe Township, moving east at 25 mph.

HAZARD...60 mph wind gusts.

SOURCE...Radar indicated.

IMPACT...Damage to roofs, siding, trees, and power lines is 
         possible.

Locations impacted include...
Trenton, Old Bridge, East Brunswick, Evesham, South Brunswick, Mount
Laurel, Ewing, Willingboro, Voorhees, Medford, Glassboro, Lindenwold,
Lumberton, Princeton, Florence, Burlington, Bristol, Mount Holly,
Clayton and Berlin.

This includes the following highways...
 New Jersey Turnpike between exits 5 and 9.
 Pennsylvania Turnpike between mile markers 358 and 359.
 Interstate 195 in New Jersey between mile markers 0 and 12.
 Interstate 295 in New Jersey between mile markers 39 and 71.
 Atlantic City Expressway between mile markers 30 and 42.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Remain alert for a possible tornado! Tornadoes can develop quickly
from severe thunderstorms. If you spot a tornado go at once into the
basement or small central room in a sturdy structure.

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

&&

LAT...LON 3963 7485 3960 7489 3958 7509 3961 7511
      4040 7472 4043 7432
TIME...MOT...LOC 2120Z 261DEG 21KT 4037 7453 3966 7493 

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

CMS

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 30, 8:37 PM EDT	Severe Thunderstorm Warning	PHI	Hunterdon, Mercer	38 min
Jun 30, 8:56 PM EDT	Special Marine Warning	PHI		94 min
Jun 30, 9:05 PM EDT	Special Weather Statement	PHI	Somerset	40 min
Jun 30, 9:21 PM EDT	Special Weather Statement	PHI	Salem	39 min
Jun 30, 9:49 PM EDT	Special Weather Statement	PHI	Monmouth	26 min
Jun 30, 9:51 PM EDT	Special Marine Warning	PHI		60 min
Jul 1, 2:58 AM EDT	Small Craft Advisory	PHI		17 hr
Jul 1, 1:10 PM EDT	Special Weather Statement	PHI	Monmouth	50 min
Jul 1, 1:16 PM EDT	Special Weather Statement	PHI	Atlantic	29 min
Jul 1, 1:28 PM EDT	Special Marine Warning	PHI		62 min
Jul 1, 1:31 PM EDT	Special Weather Statement	PHI	Cumberland	29 min
Jul 1, 4:21 PM EDT	Special Marine Warning	PHI		114 min
Jul 1, 4:27 PM EDT	Severe Thunderstorm Warning	PHI	Burlington, Camden, Gloucester, Hunterdon, Mercer, Salem and 1 more	48 min
Jul 1, 4:55 PM EDT	Severe Thunderstorm Warning	PHI	Cape May, Cumberland, Salem	80 min
Jul 1, 5:02 PM EDT	Tornado Warning	PHI	Burlington, Mercer	28 min
Jul 1, 5:27 PM EDT	Severe Thunderstorm Warning	PHI	Atlantic, Burlington, Camden, Cape May, Cumberland, Gloucester and 5 more	93 min
Jul 1, 5:35 PM EDT	Tornado Warning	PHI	Mercer, Monmouth, Ocean	25 min
Jul 1, 5:40 PM EDT	Special Marine Warning	PHI		65 min
Jul 1, 5:46 PM EDT	Special Marine Warning	PHI		119 min
Jul 1, 6:13 PM EDT	Special Marine Warning	PHI		92 min
Jun 30, 8:16 PM EDT	Special Weather Statement	PHI	Bucks, Montgomery	44 min
Jul 1, 2:51 PM EDT	Special Weather Statement	PHI	Chester, Montgomery	39 min
Jul 1, 3:13 PM EDT	Severe Thunderstorm Warning	PHI	Berks, Bucks, Chester, Lehigh, Montgomery	47 min
Jul 1, 3:23 PM EDT	Areal Flood Advisory	PHI	Chester, Montgomery	77 min
Jul 1, 3:48 PM EDT	Areal Flood Advisory	PHI	Bucks, Delaware, Montgomery, Philadelphia	112 min
Jul 1, 3:50 PM EDT	Severe Thunderstorm Warning	PHI	Bucks, Chester, Delaware, Montgomery, Philadelphia	40 min

Nearby

Severe Thunderstorm Warnings in New Jersey, 2021 Severe Thunderstorm Warnings in Pennsylvania, 2021 Every severe thunderstorm warning in 2021

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.