Alert archive / New Jersey / Severe Thunderstorm Warnings in 2017

Severe Thunderstorm Warning 87, NWS Philadelphia/Mount Holly

July 13, 20175 counties in New Jersey; Bucks County, Philadelphia County, Pennsylvania

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Jul 13, 2017, 5:21 PM EDT for 5 counties in New Jersey; Bucks County, Philadelphia County, Pennsylvania. It was in force for 54 min. 4 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 13, 2017, 5:21 PM EDT (21:21 UTC)
Expired: Jul 13, 2017, 6:15 PM EDT
In force: 54 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Burlington County, NJ, Mercer County, NJ, Middlesex County, NJ, Monmouth County, NJ, Ocean County, NJ, Bucks County, PA, Philadelphia County, PA

The radar

The Philadelphia radar (KDIX), 43 km from the middle of the area, began a volume at 21:24 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
Jul 13, 5:26 PM EDT	HAIL 0.25	Allentown, NJ
Jul 13, 5:55 PM EDT	TSTM WND DMG	1 Ese Shacks Corner, NJ	DOWNED UTILITY POLES BLOCKING TRAFFIC ON ROUTE 33
Jul 13, 6:05 PM EDT	TSTM WND DMG	1 Wnw West Long Branch, NJ	DOWNED TREE PARITALLY BLOCKING NORTHBOUND NJ 71 AT NJ 36. TIME ESTIMATED FROM RADAR
Jul 13, 6:13 PM EDT	TSTM WND DMG	Long Branch, NJ	UTILITY POLES AND WIRES DOWN IN LONG BRANCH

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 13, 2:57 PM EDT	Severe Thunderstorm Watch	SPC	6 hr

The nearest sounding before it

Brookhaven, NY (KOKX), launched 12:00Z, 9.4 hours before the alert went out and 135 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: 572 J/kg
Mixed-layer CIN: -82 J/kg
Mixed-layer LCL: 1449 m above ground
0-6 km bulk shear: 30 kt
0-1 km storm-relative helicity: 103 m²/s²
0-3 km storm-relative helicity: 140 m²/s²
Significant tornado parameter: 0.1
Supercell composite: 2.3

Open this sounding in Storm Lab

The text

As transmitted.

725 
WUUS51 KPHI 132121
SVRPHI
NJC005-021-023-025-029-PAC017-101-132215-
/O.NEW.KPHI.SV.W.0087.170713T2121Z-170713T2215Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mount Holly NJ
521 PM EDT THU JUL 13 2017

The National Weather Service in Mount Holly NJ has issued a

* Severe Thunderstorm Warning for...
  Northern Ocean County in southern New Jersey...
  Mercer County in central New Jersey...
  Northern Burlington County in southern New Jersey...
  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 615 PM EDT

* At 521 PM EDT, severe thunderstorms were located along a line
  extending from North Brunswick Township to near Jenkintown, moving
  east at 40 mph.

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

  SOURCE...Radar indicated. 

  IMPACT...Minor damage to vehicles is possible. Expect damage to 
           trees and power lines. 

* Locations impacted include...
  Philadelphia, Toms River, Trenton, New Brunswick, Long Branch,
  Asbury Park, Sandy Hook, Lakewood, Middletown, Old Bridge,
  Bensalem, Jackson, Howell, East Brunswick, South Brunswick,
  Sayreville, North Brunswick, Marlboro, Manalapan and Ewing.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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 this storm. Move indoors
immediately. Remember...if you can hear thunder...you are close
enough to be struck by lightning.

&&

LAT...LON 4013 7401 3998 7415 4005 7515 4006 7510
      4010 7507 4052 7438 4051 7426 4050 7428
      4046 7426 4044 7420 4046 7418 4045 7413
      4041 7398 4048 7402 4048 7401 4043 7397
TIME...MOT...LOC 2121Z 276DEG 35KT 4043 7449 4010 7517 

HAIL...1.00IN
WIND...60MPH
 
$$

MWG

1 follow-up statement

164 
WWUS51 KPHI 132146
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
546 PM EDT THU JUL 13 2017

PAC101-132155-
/O.CAN.KPHI.SV.W.0087.000000T0000Z-170713T2215Z/
Philadelphia PA-
546 PM EDT THU JUL 13 2017

...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN PHILADELPHIA
COUNTY IS CANCELLED...

The storms which prompted the warning have weakened. Therefore, the 
warning has been cancelled.

A severe thunderstorm watch remains in effect until 900 PM EDT for
southern, central and northern New Jersey...and southeastern
Pennsylvania.

LAT...LON 4013 7401 3998 7415 4006 7489 4009 7487
      4046 7426 4044 7420 4046 7418 4041 7403
      4040 7399 4041 7398 4048 7402 4048 7401
      4043 7397
TIME...MOT...LOC 2145Z 276DEG 35KT 4040 7419 4008 7487 

$$

NJC005-021-023-025-029-PAC017-132215-
/O.CON.KPHI.SV.W.0087.000000T0000Z-170713T2215Z/
Ocean NJ-Mercer NJ-Burlington NJ-Monmouth NJ-Middlesex NJ-Bucks PA-
546 PM EDT THU JUL 13 2017

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 615 PM EDT
FOR NORTHERN OCEAN...SOUTHEASTERN MERCER...NORTHEASTERN BURLINGTON...
MONMOUTH...SOUTHEASTERN MIDDLESEX AND SOUTHEASTERN BUCKS COUNTIES...

At 545 PM EDT, severe thunderstorms were located along a line
extending from near Matawan to Burlington, moving east at 40 mph.

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

SOURCE...Radar indicated. 

IMPACT...Minor damage to vehicles is possible. Expect damage to 
         trees and power lines. 

Locations impacted include...
Toms River, Long Branch, Asbury Park, Sandy Hook, Lakewood,
Middletown, Old Bridge, Jackson, Howell, Marlboro, Manalapan, Tinton
Falls, Holmdel, Red Bank, Florence, Burlington, Bristol, Matawan,
Jamesburg and Manasquan.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Frequent cloud to ground lightning is occurring with this storm...and
the storm will affect the beaches. For your safety...immediately move
off the beach and seek shelter indoors.

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

&&

LAT...LON 4013 7401 3998 7415 4006 7489 4009 7487
      4046 7426 4044 7420 4046 7418 4041 7403
      4040 7399 4041 7398 4048 7402 4048 7401
      4043 7397
TIME...MOT...LOC 2145Z 276DEG 35KT 4040 7419 4008 7487 

HAIL...1.00IN
WIND...60MPH
 
$$

MWG

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 12, 8:22 PM EDT	Special Weather Statement	PHI	Morris	53 min
Jul 12, 9:17 PM EDT	Special Weather Statement	PHI	Morris	28 min
Jul 13, 3:25 PM EDT	Special Weather Statement	PHI	Sussex	50 min
Jul 13, 3:28 PM EDT	Special Weather Statement	PHI	Middlesex	47 min
Jul 13, 3:58 PM EDT	Areal Flood Advisory	PHI	Sussex	4 hr
Jul 13, 4:06 PM EDT	Areal Flood Advisory	PHI	Hunterdon, Morris, Somerset, Sussex, Warren	114 min
Jul 13, 4:40 PM EDT	Special Weather Statement	PHI	Hunterdon, Middlesex, Somerset	50 min
Jul 13, 4:50 PM EDT	Severe Thunderstorm Warning	PHI	Hunterdon, Mercer, Middlesex, Monmouth, Morris, Somerset	55 min
Jul 13, 4:50 PM EDT	Severe Thunderstorm Warning	PHI	Burlington	40 min
Jul 13, 4:58 PM EDT	Special Marine Warning	PHI		62 min
Jul 13, 5:07 PM EDT	Areal Flood Advisory	PHI	Burlington, Camden, Mercer, Middlesex, Monmouth, Ocean	7 hr
Jul 13, 5:14 PM EDT	Special Weather Statement	PHI	Mercer	46 min
Jul 13, 5:31 PM EDT	Flash Flood Warning	PHI	Burlington, Mercer, Middlesex, Monmouth, Ocean	3 hr
Jul 13, 5:33 PM EDT	Special Marine Warning	PHI		87 min
Jul 13, 5:39 PM EDT	Special Weather Statement	PHI	Mercer	36 min
Jul 13, 6:07 PM EDT	Special Weather Statement	PHI	Atlantic	23 min
Jul 13, 6:07 PM EDT	Severe Thunderstorm Warning	PHI	Monmouth, Ocean	25 min
Jul 13, 6:09 PM EDT	Special Marine Warning	PHI		66 min
Jul 13, 6:20 PM EDT	Special Weather Statement	PHI	Burlington	40 min
Jul 13, 6:28 PM EDT	Special Weather Statement	PHI	Mercer	47 min
Jul 13, 6:44 PM EDT	Severe Thunderstorm Warning	PHI	Burlington, Monmouth, Ocean	45 min
Jul 13, 6:55 PM EDT	Special Marine Warning	PHI		95 min
Jul 13, 7:00 PM EDT	Special Marine Warning	PHI		90 min
Jul 13, 7:12 PM EDT	Special Weather Statement	PHI	Camden	48 min
Jul 13, 7:55 PM EDT	Special Weather Statement	PHI	Ocean	35 min
Jul 13, 7:58 PM EDT	Special Weather Statement	PHI	Cumberland	32 min
Jul 13, 3:25 PM EDT	Areal Flood Advisory	PHI	Berks, Carbon, Lehigh, Monroe, Northampton	4 hr
Jul 13, 3:30 PM EDT	Special Weather Statement	PHI	Lehigh, Northampton	45 min
Jul 13, 4:06 PM EDT	Special Weather Statement	PHI	Northampton	39 min
Jul 13, 4:08 PM EDT	Special Weather Statement	PHI	Schuylkill	37 min
Jul 13, 4:09 PM EDT	Special Weather Statement	PHI	Montgomery	36 min
Jul 13, 4:15 PM EDT	Severe Thunderstorm Warning	PHI	Berks	60 min
Jul 13, 4:34 PM EDT	Special Weather Statement	PHI	Chester	41 min
Jul 13, 4:36 PM EDT	Special Weather Statement	PHI	Lehigh	24 min
Jul 13, 4:42 PM EDT	Special Weather Statement	PHI	Montgomery, Philadelphia	48 min
Jul 13, 4:50 PM EDT	Areal Flood Advisory	PHI	Berks, Bucks, Chester, Montgomery	115 min
Jul 13, 5:08 PM EDT	Severe Thunderstorm Warning	PHI	Chester, Delaware, Montgomery	35 min
Jul 13, 5:08 PM EDT	Tornado Warning	PHI	Berks	22 min
Jul 13, 5:25 PM EDT	Flash Flood Warning	PHI	Berks, Lehigh	3 hr
Jul 13, 5:26 PM EDT	Tornado Warning	PHI	Berks, Chester, Montgomery	28 min
Jul 13, 5:30 PM EDT	Special Weather Statement	PHI	Delaware, Philadelphia	45 min
Jul 13, 5:36 PM EDT	Special Weather Statement	PHI	Montgomery	39 min
Jul 13, 5:44 PM EDT	Severe Thunderstorm Warning	PHI	Bucks, Montgomery	46 min
Jul 13, 5:56 PM EDT	Special Weather Statement	PHI	Berks	34 min
Jul 13, 6:34 PM EDT	Special Weather Statement	PHI	Delaware, Montgomery, Philadelphia	41 min
Jul 13, 7:03 PM EDT	Areal Flood Advisory	PHI	Chester, Montgomery	117 min
Jul 13, 7:26 PM EDT	Special Weather Statement	PHI	Berks, Montgomery	64 min

Nearby

Severe Thunderstorm Warnings in New Jersey, 2017 Severe Thunderstorm Warnings in Pennsylvania, 2017 Every severe thunderstorm warning in 2017

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.