Alert archive / New Jersey / Severe Thunderstorm Warnings in 2019

Severe Thunderstorm Warning 14, NWS Philadelphia/Mount Holly

April 15, 2019Bucks County, Philadelphia County, Pennsylvania; 8 counties in New Jersey

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Apr 15, 2019, 3:39 AM EDT for Bucks County, Philadelphia County, Pennsylvania; 8 counties in New Jersey. It was in force for 37 min. 16 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: Apr 15, 2019, 3:39 AM EDT (07:39 UTC)
Expired: Apr 15, 2019, 4:16 AM EDT
In force: 37 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon
Tornado: Possible
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, Ocean County, NJ, Somerset County, NJ, Bucks County, PA, Philadelphia County, PA

The radar

The Philadelphia radar (KDIX), 48 km from the middle of the area, began a volume at 07:39 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
Apr 15, 3:40 AM EDT	TSTM WND DMG	1 Ssw Haddonfield, NJ	HALF OF A TREE ROUGHLY 1-2 FEET IN DIAMETER FELL ON A CAR AND FENCE IN A RESIDENTIAL AREA. TIME ESTIMATED FROM RADAR.
Apr 15, 3:41 AM EDT	TSTM WND GST 58	Northeast Philadelphia, PA
Apr 15, 3:48 AM EDT	TSTM WND GST 59	Burlington, NJ
Apr 15, 3:55 AM EDT	TSTM WND GST 60	Eastampton Twp, NJ
Apr 15, 4:00 AM EDT	TSTM WND DMG	2 Sse Hamilton Twp, NJ	CORRECTS PREVIOUS TSTM WND DMG REPORT FROM 2 SSE HAMILTON TWP. DOWNED TREE ON I-295 SOUTHBOUND RAMP TO EXIT 61 - ARENA DR (HAMILTON TWP) RAMP CLOSED. TIME ESTIMATED FROM RADAR.
Apr 15, 4:00 AM EDT	TSTM WND DMG	2 Sse Hamilton Twp, NJ	DOWNED TREE ON I-295 SOUTHBOUND RAMP TO EXIT 61 - ARENA DR (HAMILTON TWP) RAMP CLOSED. TIME ESTIMATED FROM RADAR.
Apr 15, 4:00 AM EDT	TSTM WND DMG	2 W Robbinsville Twp., NJ	CORRECTS PREVIOUS TSTM WND DMG REPORT FROM 2 W ROBBINSVILLE TWP.. TREE DOWN. TIME ESTIMATED FROM RADAR.
Apr 15, 4:00 AM EDT	TSTM WND DMG	2 W Robbinsville Twp., NJ	TREE DOWN. TIME ESTIMATED FROM RADAR.
Apr 15, 4:00 AM EDT	TSTM WND DMG	Hamilton Twp, NJ	MULTIPLE LARGE TREES DOWN.
Apr 15, 4:03 AM EDT	TSTM WND DMG	Robbinsville Twp., NJ	ROOF BLOWN OFF OF A SHED. SEVERAL TREES DOWN, INCLUDING ONE ONTO A VEHICLE. TIME ESTIMATED FROM RADAR.
Apr 15, 4:07 AM EDT	TSTM WND DMG	1 Wsw East Windsor Twp, NJ	ROOF DAMAGE TO A BARN AT COOP SITE (TURKEY FARM). TIME ESTIMATED FROM RADAR.
Apr 15, 4:07 AM EDT	TSTM WND DMG	1 Wsw East Windsor Twp, NJ	SEVERAL LARGE TREES UPROOTED ON SHAGBARK LANE. ONE TREE FELL ONTO A HOUSE CAUSING CONSIDERABLE STRUCTURAL DAMAGE.
Apr 15, 4:07 AM EDT	TSTM WND DMG	2 Nne Windsor, NJ	TREE FELL ONTO A HOUSE. TIME ESTIMATED FROM RADAR.
Apr 15, 4:10 AM EDT	TSTM WND DMG	3 Nne East Windsor Twp, NJ	NUMEROUS TREES UPROOTED AND DOWNED IN CARNBURY TWP. TIME ESTIMATED FROM RADAR.
Apr 15, 4:10 AM EDT	TSTM WND DMG	3 Nne East Windsor Twp, NJ	NUMEROUS TREES UPROOTED AND DOWNED IN CRANBURY TWP. TIME ESTIMATED FROM RADAR.
Apr 15, 4:20 AM EDT	TSTM WND DMG	2 W Robbinsville Twp., NJ	TREE DOWN. 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
Apr 15, 1:05 AM EDT	Tornado Watch	SPC	5 hr

The nearest sounding before it

Brookhaven, NY (KOKX), launched 00:00Z, 7.7 hours before the alert went out and 158 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: 7 J/kg
Mixed-layer CIN: -95 J/kg
Mixed-layer LCL: 437 m above ground
0-6 km bulk shear: 57 kt
0-1 km storm-relative helicity: 236 m²/s²
0-3 km storm-relative helicity: 268 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.2

Open this sounding in Storm Lab

The text

As transmitted.

157 
WUUS51 KPHI 150739
SVRPHI
NJC005-007-015-021-023-025-029-035-PAC017-101-150830-
/O.NEW.KPHI.SV.W.0014.190415T0739Z-190415T0830Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mount Holly NJ
339 AM EDT MON APR 15 2019

The National Weather Service in Mount Holly NJ has issued a

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

* Until 430 AM EDT.

* At 338 AM EDT, severe thunderstorms were located along a line
  extending from near Newtown to Bellmawr, moving northeast at 60
  mph.

  HAZARD...60 mph wind gusts and penny size hail.

  SOURCE...Radar indicated.

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

* Locations impacted include...
  Philadelphia, Trenton, Camden, New Brunswick, Perth Amboy,
  Gloucester City, Somerset, Edison, Cherry Hill, Old Bridge,
  Bensalem, East Brunswick, South Brunswick, Sayreville, Mount
  Laurel, North Brunswick, Manalapan, Ewing, Willingboro and
  Carteret.

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.

Intense thunderstorm lines can produce brief tornadoes and widespread
significant wind damage. Although a tornado is not immediately
likely, it is best to move to an interior room on the lowest floor of
a building. These storms may cause serious injury and significant
property damage.

&&

A tornado watch remains in effect until 700 AM EDT for southern,
central, northern and northwestern New Jersey...and southeastern
Pennsylvania.

LAT...LON 4050 7426 4050 7428 4046 7426 4013 7437
      3976 7516 4012 7503 4013 7502 4014 7503
      4031 7497 4034 7490 4035 7486 4037 7486
      4060 7439 4061 7431 4059 7429 4060 7422
TIME...MOT...LOC 0738Z 237DEG 52KT 4027 7494 3986 7508 

TORNADO...POSSIBLE
HAIL...0.75IN
WIND...60MPH
 
$$

SFJ

2 follow-up statements

969 
WWUS51 KPHI 150802
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
402 AM EDT MON APR 15 2019

NJC007-015-PAC101-150811-
/O.CAN.KPHI.SV.W.0014.000000T0000Z-190415T0830Z/
Camden NJ-Gloucester NJ-Philadelphia PA-
402 AM EDT MON APR 15 2019

...THE SEVERE THUNDERSTORM WARNING FOR NORTHWESTERN CAMDEN...NORTH
CENTRAL GLOUCESTER 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 tornado watch remains in effect until 700 AM EDT for southern,
central and northern New Jersey...and southeastern Pennsylvania.

LAT...LON 4050 7426 4050 7428 4046 7426 4013 7437
      3990 7486 4044 7471 4060 7439 4061 7431
      4059 7429 4060 7422
TIME...MOT...LOC 0801Z 237DEG 52KT 4043 7461 4002 7475 

$$

NJC005-021-023-025-029-035-PAC017-150830-
/O.CON.KPHI.SV.W.0014.000000T0000Z-190415T0830Z/
Ocean NJ-Mercer NJ-Burlington NJ-Somerset NJ-Monmouth NJ-
Middlesex NJ-Bucks PA-
402 AM EDT MON APR 15 2019

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 430 AM EDT
FOR NORTHWESTERN OCEAN...MERCER...NORTH CENTRAL BURLINGTON...
SOUTHEASTERN SOMERSET...SOUTHWESTERN MONMOUTH...MIDDLESEX AND EASTERN
BUCKS COUNTIES...

At 401 AM EDT, severe thunderstorms were located along a line
extending from near Rocky Hill to Jacksonville, moving northeast at
60 mph.

HAZARD...60 mph wind gusts and penny size hail.

SOURCE...Radar indicated.

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

Locations impacted include...
Trenton, New Brunswick, Perth Amboy, Somerset, Edison, Old Bridge,
East Brunswick, South Brunswick, Sayreville, North Brunswick,
Manalapan, Ewing, Carteret, Lumberton, Princeton, Florence, Mount
Holly, Jamesburg, Hightstown and Bordentown.

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.

Intense thunderstorm lines can produce brief tornadoes and widespread
significant wind damage. Although a tornado is not immediately
likely, it is best to move to an interior room on the lowest floor of
a building. These storms may cause serious injury and significant
property damage.

&&

A tornado watch remains in effect until 700 AM EDT for southern,
central and northern New Jersey...and southeastern Pennsylvania.

LAT...LON 4050 7426 4050 7428 4046 7426 4013 7437
      3990 7486 4044 7471 4060 7439 4061 7431
      4059 7429 4060 7422
TIME...MOT...LOC 0801Z 237DEG 52KT 4043 7461 4002 7475 

TORNADO...POSSIBLE
HAIL...0.75IN
WIND...60MPH
 
$$

SFJ

014 
WWUS51 KPHI 150816
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
416 AM EDT MON APR 15 2019

NJC005-021-023-025-029-035-PAC017-150826-
/O.CAN.KPHI.SV.W.0014.000000T0000Z-190415T0830Z/
Ocean NJ-Mercer NJ-Burlington NJ-Somerset NJ-Monmouth NJ-
Middlesex NJ-Bucks PA-
416 AM EDT MON APR 15 2019

...THE SEVERE THUNDERSTORM WARNING FOR NORTHWESTERN OCEAN...MERCER...
NORTH CENTRAL BURLINGTON...SOUTHEASTERN SOMERSET...SOUTHWESTERN
MONMOUTH...MIDDLESEX AND EASTERN BUCKS COUNTIES IS CANCELLED...
            
The storms which prompted the warning have weakened below severe
limits, and no longer pose an immediate threat to life or property.
Therefore, the warning has been cancelled.  However gusty winds are
still possible with these thunderstorms.

A tornado watch remains in effect until 700 AM EDT for southern,
central and northern New Jersey.

LAT...LON 4050 7426 4050 7428 4046 7426 4013 7437
      3990 7486 4044 7471 4060 7439 4061 7431
      4059 7429 4060 7422
TIME...MOT...LOC 0814Z 237DEG 52KT 4054 7439 4013 7453 

$$

SFJ

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 14, 9:19 PM EDT	Areal Flood Advisory	PHI	Berks	3 hr
Apr 15, 12:03 AM EDT	Special Weather Statement	PHI	Monroe	27 min
Apr 15, 1:10 AM EDT	Special Weather Statement	PHI	Schuylkill	50 min
Apr 15, 1:26 AM EDT	Areal Flood Advisory	PHI	Carbon, Monroe	4 hr
Apr 15, 1:28 AM EDT	Severe Thunderstorm Warning	PHI	Carbon, Monroe	47 min
Apr 15, 1:43 AM EDT	Areal Flood Advisory	PHI	Berks	4 hr
Apr 15, 1:58 AM EDT	Special Weather Statement	PHI	Berks, Carbon, Monroe	47 min
Apr 15, 2:21 AM EDT	Areal Flood Advisory	PHI	Lehigh, Northampton	4 hr
Apr 15, 2:28 AM EDT	Special Weather Statement	PHI	Chester	32 min
Apr 15, 2:34 AM EDT	Special Weather Statement	PHI	Berks, Chester, Lehigh, Northampton	41 min
Apr 15, 2:46 AM EDT	Severe Thunderstorm Warning	PHI	Delaware	44 min
Apr 15, 3:03 AM EDT	Severe Thunderstorm Warning	PHI	Bucks, Lehigh, Montgomery, Northampton	20 min
Apr 15, 3:11 AM EDT	Special Weather Statement	PHI	Bucks, Montgomery, Northampton	49 min
Apr 15, 3:19 AM EDT	Tornado Warning	PHI	Delaware, Montgomery, Philadelphia	26 min
Apr 15, 3:19 AM EDT	Wind Advisory	PHI	Berks, Bucks, Carbon, Chester, Delaware, Lehigh and 4 more	18 hr
Apr 15, 3:27 AM EDT	Severe Thunderstorm Warning	PHI	Bucks, Chester, Montgomery	32 min
Apr 15, 3:59 AM EDT	Areal Flood Advisory	PHI	Montgomery	4 hr
Apr 15, 12:31 AM EDT	Marine Dense Fog Advisory	PHI		5 hr
Apr 15, 2:47 AM EDT	Special Marine Warning	PHI		58 min
Apr 15, 3:00 AM EDT	Areal Flood Advisory	PHI	Sussex, Warren	4 hr
Apr 15, 3:07 AM EDT	Severe Thunderstorm Warning	PHI	Camden, Cumberland, Gloucester, Salem	38 min
Apr 15, 3:08 AM EDT	Special Marine Warning	PHI		67 min
Apr 15, 3:41 AM EDT	Severe Thunderstorm Warning	PHI	Atlantic, Burlington, Camden, Cape May, Cumberland, Gloucester and 2 more	64 min
Apr 15, 3:42 AM EDT	Special Marine Warning	PHI		63 min
Apr 15, 3:57 AM EDT	Severe Thunderstorm Warning	PHI	Middlesex, Morris, Somerset	13 min
Apr 15, 4:16 AM EDT	Special Marine Warning	PHI		59 min
Apr 15, 4:40 AM EDT	Special Marine Warning	PHI		65 min
Apr 15, 4:47 AM EDT	Special Weather Statement	PHI	Atlantic	28 min
Apr 15, 5:07 AM EDT	Special Marine Warning	PHI		53 min
Apr 15, 5:30 AM EDT	Coastal Flood Statement	PHI	Ocean	7 hr
Apr 15, 6:59 AM EDT	Areal Flood Warning	PHI	Hunterdon	4 hr

Nearby

Severe Thunderstorm Warnings in New Jersey, 2019 Severe Thunderstorm Warnings in Pennsylvania, 2019 Every severe thunderstorm warning in 2019

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.