Alert archive / New Jersey / Severe Thunderstorm Warnings in 2017

Severe Thunderstorm Warning 97, NWS Philadelphia/Mount Holly

July 14, 20175 counties in New Jersey

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Jul 14, 2017, 3:43 PM EDT for 5 counties in New Jersey. It was in force for 47 min. 5 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 14, 2017, 3:43 PM EDT (19:43 UTC)
Expired: Jul 14, 2017, 4:30 PM EDT
In force: 47 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon
Tornado: Possible
Hail: 1.75 in
Wind: 60.0 mph

Counties Atlantic County, NJ, Burlington County, NJ, Camden County, NJ, Gloucester County, NJ, Salem County, NJ

The radar

The Philadelphia radar (KDIX), 71 km from the middle of the area, began a volume at 19:45 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 14, 3:45 PM EDT	TSTM WND DMG	Pittsgrove Twp, NJ	TREES AND WIRES DOWN IN ALLOWAY AND CARNEYS POINT AS WELL.
Jul 14, 3:45 PM EDT	TSTM WND DMG	Pittsgrove Twp, NJ	TRRES AND WIRES DOWN IN ALLOWAY AND CARNEYS POINT AS WELL.
Jul 14, 3:47 PM EDT	TSTM WND DMG	Alloway, NJ	DAMAGE REPORTED... TYPE UNKNOWN.
Jul 14, 4:00 PM EDT	TSTM WND DMG	1 N Woods Mills, NJ	DOWNED TREE AND WIRES BLOCKING US 40. TIME ESTIMATED FROM RADAR.
Jul 14, 4:21 PM EDT	TSTM WND DMG	Malaga, NJ	TREES DOWN NEAR ROUTE 322. TIME ESTIMATED.

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 14, 1:40 PM EDT	Severe Thunderstorm Watch	SPC	7 hr

The nearest sounding before it

Wallops Is Stn, VA (KWAL), launched 12:00Z, 7.7 hours before the alert went out and 189 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: 908 J/kg
Mixed-layer CIN: -100 J/kg
Mixed-layer LCL: 959 m above ground
0-6 km bulk shear: 23 kt
0-1 km storm-relative helicity: 56 m²/s²
0-3 km storm-relative helicity: 96 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.5

Open this sounding in Storm Lab

The text

As transmitted.

679 
WUUS51 KPHI 141943
SVRPHI
NJC001-005-007-015-033-142030-
/O.NEW.KPHI.SV.W.0097.170714T1943Z-170714T2030Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mount Holly NJ
343 PM EDT FRI JUL 14 2017

The National Weather Service in Mount Holly NJ has issued a

* Severe Thunderstorm Warning for...
  Northwestern Atlantic County in southern New Jersey...
  Central Salem County in southern New Jersey...
  Camden County in southern New Jersey...
  Gloucester County in southern New Jersey...
  Central Burlington County in southern New Jersey...

* Until 430 PM EDT

* At 342 PM EDT, severe thunderstorms were located along a line
  extending from Port Penn to near Woodstown to Swedesboro, moving
  east at 40 mph.

  HAZARD...Golf ball size hail and 60 mph wind gusts. 

  SOURCE...Radar indicated. 

  IMPACT...People and animals outdoors will be injured. Expect hail 
           damage to roofs, siding, windows, and vehicles. Expect 
           damage to trees and power lines. 

* Severe thunderstorms will be near,
  Mullica Hill around 350 PM EDT. 
  Deptford and Woodbury Heights around 355 PM EDT. 
  Glassboro, Woodbury, Pitman and Clayton around 400 PM EDT. 
  Magnolia, Woodstown, Williamstown, Monroe Township, Turnersville 
  and Sicklerville around 405 PM EDT. 
  Voorhees, Lindenwold, Echelon, Springdale and Ashland around 410 
  PM EDT. 
  Evesham, Berlin, Chesilhurst, Elmer, Marlton Lakes, Olivet, Atco 
  and Marlton around 415 PM EDT. 
  Franklinville around 420 PM EDT. 
  Medford, Hammonton, Newfield, Atsion and Malaga around 425 PM EDT. 

Other locations impacted by these severe thunderstorms include Laurel
Springs, Oak Valley, Glendora, Blackwood, Stratford, Pine Valley,
Collings Lakes, Gibbsboro, Clementon and Hi-Nella.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

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.

&&

LAT...LON 3955 7499 3955 7504 3956 7506 3955 7507
      3954 7522 3956 7524 3954 7526 3953 7557
      3963 7531 3978 7539 3994 7467 3967 7467
TIME...MOT...LOC 1942Z 258DEG 35KT 3954 7556 3965 7525 3975 7532 

TORNADO...POSSIBLE
HAIL...1.75IN
WIND...60MPH
 
$$

Drag

2 follow-up statements

226 
WWUS51 KPHI 142008
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
408 PM EDT FRI JUL 14 2017

NJC001-005-142017-
/O.CAN.KPHI.SV.W.0097.000000T0000Z-170714T2030Z/
Atlantic NJ-Burlington NJ-
408 PM EDT FRI JUL 14 2017

...THE SEVERE THUNDERSTORM WARNING FOR NORTHWESTERN ATLANTIC AND
CENTRAL BURLINGTON COUNTIES IS CANCELLED...

The storms which prompted the warning have weakend and moved out of 
the warned area. Therefore, the warning has been cancelled. However 
heavy rain and gusty winds remain possible with other storms. 
Another severe thunderstorm is in effect for portions of Atlantic 
county.

A severe thunderstorm watch remains in effect until 900 PM EDT for
southern New Jersey.

LAT...LON 3958 7491 3955 7499 3955 7503 3956 7506
      3955 7507 3954 7521 3956 7524 3954 7526
      3954 7542 3962 7533 3963 7531 3964 7531
      3978 7515 3970 7483
TIME...MOT...LOC 2007Z 321DEG 17KT 3943 7535 3955 7522 3969 7511 

$$

NJC007-015-033-142030-
/O.CON.KPHI.SV.W.0097.000000T0000Z-170714T2030Z/
Salem NJ-Camden NJ-Gloucester NJ-
408 PM EDT FRI JUL 14 2017

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 430 PM EDT
FOR EAST CENTRAL SALEM...SOUTH CENTRAL CAMDEN AND SOUTHEASTERN
GLOUCESTER COUNTIES...

At 407 PM EDT, severe thunderstorms were located along a line
extending from near Greenwich to near Olivet to Glassboro, moving
southeast at 20 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...
Glassboro, Pitman, Clayton, Alloway, Quinton, Newfield, Elmer,
Franklinville, Sicklerville, Williamstown, Malaga, Monroe Township,
Olivet and Turnersville.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

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

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.

&&

LAT...LON 3958 7491 3955 7499 3955 7503 3956 7506
      3955 7507 3954 7521 3956 7524 3954 7526
      3954 7542 3962 7533 3963 7531 3964 7531
      3978 7515 3970 7483
TIME...MOT...LOC 2007Z 321DEG 17KT 3943 7535 3955 7522 3969 7511 

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

Robertson

733 
WWUS51 KPHI 142023
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
423 PM EDT FRI JUL 14 2017

NJC007-015-033-142032-
/O.EXP.KPHI.SV.W.0097.000000T0000Z-170714T2030Z/
Salem NJ-Camden NJ-Gloucester NJ-
423 PM EDT FRI JUL 14 2017

...THE SEVERE THUNDERSTORM WARNING FOR EAST CENTRAL SALEM...SOUTH
CENTRAL CAMDEN AND SOUTHEASTERN GLOUCESTER COUNTIES WILL EXPIRE AT
430 PM EDT...
    
The storms which prompted this warning have weakened below severe 
limits, and have exited the warned area. Therefore the warning will 
be allowed to expire.  However a Severe Thunderstorm Warning still 
remains in effect for portions of Gloucester and Salem counties.

A severe thunderstorm watch remains in effect until 900 PM EDT for
southern New Jersey.


LAT...LON 3958 7491 3955 7499 3955 7503 3956 7506
      3955 7507 3954 7521 3956 7524 3954 7526
      3954 7542 3962 7533 3963 7531 3964 7531
      3978 7515 3970 7483
TIME...MOT...LOC 2022Z 258DEG 35KT 3946 7517 3958 7504 3972 7493 

$$

Robertson

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 13, 8:17 PM EDT	Special Weather Statement	PHI	Camden	43 min
Jul 13, 8:26 PM EDT	Special Weather Statement	PHI	Cape May	34 min
Jul 13, 8:27 PM EDT	Areal Flood Advisory	PHI	Atlantic, Burlington, Camden, Cape May, Cumberland, Gloucester and 2 more	4 hr
Jul 13, 8:49 PM EDT	Special Weather Statement	PHI	Cumberland	26 min
Jul 13, 8:51 PM EDT	Special Weather Statement	PHI	Atlantic	54 min
Jul 13, 9:07 PM EDT	Severe Thunderstorm Warning	PHI	Atlantic, Cape May, Cumberland, Gloucester, Salem	53 min
Jul 13, 9:46 PM EDT	Special Weather Statement	PHI	Atlantic	14 min
Jul 13, 9:50 PM EDT	Special Marine Warning	PHI		115 min
Jul 13, 9:57 PM EDT	Special Weather Statement	PHI	Cape May	33 min
Jul 13, 10:42 PM EDT	Special Marine Warning	PHI		93 min
Jul 14, 7:21 AM EDT	Areal Flood Advisory	PHI	Morris, Sussex, Warren	3 hr
Jul 14, 11:40 AM EDT	Flash Flood Watch	PHI	Atlantic, Camden, Cape May, Cumberland, Gloucester, Salem	11 hr
Jul 14, 2:57 PM EDT	Areal Flood Advisory	PHI	Burlington, Hunterdon, Mercer, Middlesex, Monmouth, Ocean and 1 more	3 hr
Jul 14, 3:07 PM EDT	Special Marine Warning	PHI		53 min
Jul 14, 3:18 PM EDT	Severe Thunderstorm Warning	PHI	Gloucester, Salem	12 min
Jul 14, 3:23 PM EDT	Severe Thunderstorm Warning	PHI	Gloucester, Salem	67 min
Jul 14, 3:25 PM EDT	Areal Flood Advisory	PHI	Burlington, Camden, Cumberland, Gloucester, Ocean, Salem	4 hr
Jul 14, 3:34 PM EDT	Flash Flood Warning	PHI	Gloucester, Salem	3 hr
Jul 14, 3:35 PM EDT	Severe Thunderstorm Warning	PHI	Atlantic, Cumberland, Gloucester	55 min
Jul 14, 3:47 PM EDT	Areal Flood Advisory	PHI	Atlantic, Burlington, Ocean	3 hr
Jul 14, 3:54 PM EDT	Severe Thunderstorm Warning	PHI	Cumberland, Gloucester, Salem	66 min
Jul 14, 4:12 PM EDT	Severe Thunderstorm Warning	PHI	Atlantic, Cape May	63 min
Jul 14, 4:13 PM EDT	Flash Flood Warning	PHI	Atlantic, Burlington, Camden, Cape May, Cumberland, Gloucester and 2 more	3 hr
Jul 14, 4:18 PM EDT	Special Marine Warning	PHI		57 min
Jul 14, 4:25 PM EDT	Special Marine Warning	PHI		95 min
Jul 14, 4:44 PM EDT	Severe Thunderstorm Warning	PHI	Atlantic, Cape May, Cumberland, Gloucester, Salem	61 min
Jul 14, 4:54 PM EDT	Special Marine Warning	PHI		66 min
Jul 14, 5:47 PM EDT	Special Weather Statement	PHI	Cape May	13 min
Jul 14, 5:53 PM EDT	Special Marine Warning	PHI		52 min
Jul 14, 6:32 PM EDT	Special Marine Warning	PHI		88 min
Jul 14, 7:08 PM EDT	Special Marine Warning	PHI		97 min
Jul 14, 7:28 PM EDT	Areal Flood Advisory	PHI	Atlantic, Camden, Cape May, Cumberland, Gloucester, Salem	3 hr

Nearby

Severe Thunderstorm Warnings in New Jersey, 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.