Alert archive / New Jersey / Severe Thunderstorm Warnings in 2017

Severe Thunderstorm Warning 15, NWS Philadelphia/Mount Holly

February 25, 201711 counties in New Jersey; Bucks County, Montgomery County, Philadelphia County, Pennsylvania

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Feb 25, 2017, 5:17 PM EST for 11 counties in New Jersey; Bucks County, Montgomery County, Philadelphia County, Pennsylvania. It was in force for 43 min. 1 report 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: Feb 25, 2017, 5:17 PM EST (22:17 UTC)
Expired: Feb 25, 2017, 6:00 PM EST
In force: 43 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

Counties Atlantic County, NJ, Burlington County, NJ, Camden County, NJ, Cumberland County, NJ, Gloucester County, NJ, Mercer County, NJ, Middlesex County, NJ, Monmouth County, NJ, Ocean County, NJ, Salem County, NJ, Somerset County, NJ, Bucks County, PA, Montgomery County, PA, Philadelphia County, PA

The radar

The Philadelphia radar (KDIX), 32 km from the middle of the area, began a volume at 22:16 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
Feb 25, 5:20 PM EST	TSTM WND GST 60	Turnersville, NJ

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
Feb 25, 1:30 PM EST	Severe Thunderstorm Watch	SPC	6 hr
Feb 25, 2:46 PM EST	Severe Thunderstorm Watch	SPC	5 hr

The nearest sounding before it

Brookhaven, NY (KOKX), launched 12:00Z, 10.3 hours before the alert went out and 188 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: 576 m above ground
0-6 km bulk shear: 29 kt
0-1 km storm-relative helicity: 95 m²/s²
0-3 km storm-relative helicity: 87 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

865 
WUUS51 KPHI 252217
SVRPHI
NJC001-005-007-011-015-021-023-025-029-033-035-PAC017-091-101-252300-
/O.NEW.KPHI.SV.W.0015.170225T2217Z-170225T2300Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mount Holly NJ
517 PM EST SAT FEB 25 2017

The National Weather Service in Mount Holly NJ  has issued a

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

* Until 600 PM EST

* At 517 PM EST, severe thunderstorms were located along a line
  extending from near Germantown to near Woodbury Heights to near
  Seabrook Farms, moving northeast at 50 mph.

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

  SOURCE...Radar indicated. 

  IMPACT...Expect damage to roofs, siding, and trees. 

* Severe thunderstorms will be near,
  Deptford, Woodbury, Jenkintown, Woodbury Heights, National Park, 
  Rockledge, Abington, Wissinoming, Tacony and Kensington around 520 
  PM EST. 
  Gloucester City, Bellmawr, Riverside, Westville, Brooklawn, Bryn 
  Athyn, Audubon Park, Northeast Philadelphia, Willow Grove and 
  Turnersville around 525 PM EST. 
  Philadelphia, Camden, Vineland, Cherry Hill, Bensalem, Voorhees, 
  Lindenwold, Berlin, Magnolia and Beverly around 530 PM EST. 
  Evesham, Mount Laurel, Burlington, Bristol, Clayton, Palmyra, 
  Newtown, Langhorne, Langhorn and Marlton around 535 PM EST. 
  Medford, Yardley, Tullytown, Woodside, Monroe Township, 
  Williamstown, Levittown and Sicklerville around 540 PM EST. 
  Trenton, Ewing, Willingboro, Lumberton, Mount Holly, Washington 
  Crossing, Washington Crossing and Leisuretowne around 545 PM EST. 
  Florence, Pennington, Chesilhurst, Pemberton, Lawrenceville, 
  Jacksonville, Atco, Mercerville-Hamilton Square, Marlton Lakes and 
  White Horse around 550 PM EST. 
  Hammonton, Princeton, Wrightstown, Jobstown, Atsion, Columbus, 
  Edinburg, Windsor and Florence-Roebling around 555 PM EST. 

Other locations impacted by these severe thunderstorms include
Country Lake Estates, Oak Valley, Cornwells Heights-Eddington,
Churchville, Hulmeville, Moorestown-Lenola, Merchantville, Tavistock,
Gibbsboro and Pennsauken.

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.

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

&&

LAT...LON 4018 7440 3978 7452 3944 7533 3976 7520
      4011 7518 4061 7438
TIME...MOT...LOC 2217Z 235DEG 44KT 4006 7516 3978 7517 3952 7525 

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

DRAG

2 follow-up statements

975 
WWUS51 KPHI 252242
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
542 PM EST SAT FEB 25 2017

NJC001-011-015-033-PAC091-101-252250-
/O.CAN.KPHI.SV.W.0015.000000T0000Z-170225T2300Z/
Atlantic NJ-Cumberland NJ-Salem NJ-Gloucester NJ-Montgomery PA-
Philadelphia PA-
542 PM EST SAT FEB 25 2017

...THE SEVERE THUNDERSTORM WARNING FOR NORTH CENTRAL ATLANTIC...
NORTHWESTERN CUMBERLAND...EAST CENTRAL SALEM...GLOUCESTER...EAST
CENTRAL MONTGOMERY AND 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 EST for
southern New Jersey. A severe thunderstorm watch also remains in
effect until 900 PM EST for central, northern and southern New
Jersey...and southeastern Pennsylvania.

LAT...LON 4000 7445 3990 7449 3976 7491 3990 7493
      4022 7494 4060 7438 4018 7440
TIME...MOT...LOC 2240Z 235DEG 64KT 4027 7478 4014 7478 3996 7477 

$$

NJC005-007-021-023-025-029-035-PAC017-252300-
/O.CON.KPHI.SV.W.0015.000000T0000Z-170225T2300Z/
Ocean NJ-Camden NJ-Mercer NJ-Burlington NJ-Somerset NJ-Monmouth NJ-
Middlesex NJ-Bucks PA-
542 PM EST SAT FEB 25 2017

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 600 PM EST
FOR NORTHWESTERN OCEAN...CENTRAL CAMDEN...MERCER...NORTHERN
BURLINGTON...SOUTHEASTERN SOMERSET...SOUTHWESTERN MONMOUTH...WESTERN
MIDDLESEX AND SOUTHEASTERN BUCKS COUNTIES...

At 540 PM EST, severe thunderstorms were located along a line
extending from Ewing to near Florence-Roebling to near Lumberton,
moving northeast around 60 mph.

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

SOURCE...Radar indicated. 

IMPACT...Expect damage to roofs, siding, and trees. 

These severe storms will be near...
  Pennington, White Horse, Lawrenceville and Crosswicks around 545 
  PM EST. 
  Princeton, Allentown, Rocky Hill, Windsor, Kingston, Edinburg, 
  Plainsboro Center, Princeton Meadows, Mercerville-Hamilton Square 
  and Browns Mills around 550 PM EST. 
  South Brunswick, North Brunswick, Hightstown, Cranbury, Roosevelt, 
  Dayton, Twin Rivers, Kendall Park, Clearbrook Park and Cream Ridge 
  around 555 PM EST. 
  New Brunswick, Somerset, East Brunswick, Manalapan, Jamesburg, Six 
  Flags Theme Park, Whittingham, North Brunswick Township, 
  Clarksburg and Society Hill around 600 PM EST. 

Other locations impacted by these severe thunderstorms include
Country Lake Estates, Hulmeville, Princeton Junction, Milltown,
Pemberton Heights, New Egypt, Yardville-Groveville, Monmouth
Junction, Heathcote and Medford Lakes.

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.

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

&&

LAT...LON 4000 7445 3990 7449 3976 7491 3990 7493
      4022 7494 4060 7438 4018 7440
TIME...MOT...LOC 2240Z 235DEG 64KT 4027 7478 4014 7478 3996 7477 

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

DRAG

756 
WWUS51 KPHI 252250
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
550 PM EST SAT FEB 25 2017

NJC007-252259-
/O.CAN.KPHI.SV.W.0015.000000T0000Z-170225T2300Z/
Camden NJ-
550 PM EST SAT FEB 25 2017

...THE SEVERE THUNDERSTORM WARNING FOR CENTRAL CAMDEN COUNTY 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 EST for
southern New Jersey. A severe thunderstorm watch also remains in
effect until 900 PM EST for central, northern and southern New
Jersey...and southeastern Pennsylvania.

LAT...LON 4000 7445 3996 7447 3988 7470 4010 7480
      4033 7478 4060 7438 4018 7440
TIME...MOT...LOC 2249Z 228DEG 51KT 4038 7467 4020 7468 4002 7467 

$$

NJC005-021-023-025-029-035-PAC017-252300-
/O.CON.KPHI.SV.W.0015.000000T0000Z-170225T2300Z/
Ocean NJ-Mercer NJ-Burlington NJ-Somerset NJ-Monmouth NJ-
Middlesex NJ-Bucks PA-
550 PM EST SAT FEB 25 2017

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 600 PM EST
FOR NORTHWESTERN OCEAN...MERCER...NORTHEASTERN BURLINGTON...
SOUTHEASTERN SOMERSET...SOUTHWESTERN MONMOUTH...WESTERN MIDDLESEX AND
EASTERN BUCKS COUNTIES...

At 549 PM EST, severe thunderstorms were located along a line
extending from Princeton to White Horse to Jobstown, moving northeast
at nearly 60 mph.

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

SOURCE...Radar indicated. 

IMPACT...Expect damage to roofs, siding, and trees. 

These severe storms will be near...
  South Brunswick, Princeton, Rocky Hill, Windsor, Kingston and 
  Dayton around 555 PM EST. 
  New Brunswick, Somerset, East Brunswick, North Brunswick, 
  Manalapan, Jamesburg, Hightstown, Cranbury, Roosevelt and Kendall 
  Park around 600 PM EST. 

Other locations impacted by these severe thunderstorms include
Country Lake Estates, Highland Park, South Plainfield, Concordia,
Fieldsboro, Princeton Junction, Princeton North, Milltown, Pemberton
Heights and New Egypt.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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 4000 7445 3996 7447 3988 7470 4010 7480
      4033 7478 4060 7438 4018 7440
TIME...MOT...LOC 2249Z 228DEG 51KT 4038 7467 4020 7468 4002 7467 

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

DRAG

The office that day

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

Issued	Product	Office	Counties	Lasted
Feb 24, 9:50 PM EST	Marine Dense Fog Advisory	PHI		20 hr
Feb 25, 4:17 PM EST	Severe Thunderstorm Warning	PHI	Hunterdon, Morris, Warren	43 min
Feb 25, 4:24 PM EST	Special Marine Warning	PHI		66 min
Feb 25, 4:40 PM EST	Severe Thunderstorm Warning	PHI	Camden, Cumberland, Gloucester, Salem	50 min
Feb 25, 4:54 PM EST	Severe Thunderstorm Warning	PHI	Hunterdon, Morris, Somerset, Sussex, Warren	51 min
Feb 25, 4:59 PM EST	Special Marine Warning	PHI		61 min
Feb 25, 5:01 PM EST	Special Weather Statement	PHI	Mercer, Somerset	44 min
Feb 25, 5:23 PM EST	Severe Thunderstorm Warning	PHI	Atlantic, Burlington, Cape May, Cumberland, Gloucester, Salem	52 min
Feb 25, 5:38 PM EST	Special Marine Warning	PHI		67 min
Feb 25, 6:04 PM EST	Special Weather Statement	PHI	Middlesex, Monmouth, Ocean	41 min
Feb 25, 6:09 PM EST	Special Marine Warning	PHI		66 min
Feb 25, 6:14 PM EST	Special Weather Statement	PHI	Atlantic	31 min
Feb 25, 6:20 PM EST	Special Marine Warning	PHI		85 min
Feb 25, 2:22 PM EST	Special Weather Statement	PHI	Lebanon	53 min
Feb 25, 2:47 PM EST	Severe Thunderstorm Warning	PHI	Berks	43 min
Feb 25, 2:55 PM EST	Special Weather Statement	PHI	Carbon	50 min
Feb 25, 3:02 PM EST	Special Weather Statement	PHI	Berks	58 min
Feb 25, 3:19 PM EST	Severe Thunderstorm Warning	PHI	Berks, Carbon, Lehigh, Northampton	41 min
Feb 25, 3:26 PM EST	Severe Thunderstorm Warning	PHI	Berks, Chester	64 min
Feb 25, 3:57 PM EST	Special Weather Statement	PHI	Lehigh, Montgomery	48 min
Feb 25, 4:04 PM EST	Severe Thunderstorm Warning	PHI	Chester, Delaware	41 min
Feb 25, 4:05 PM EST	Severe Thunderstorm Warning	PHI	Carbon, Lehigh, Monroe	40 min
Feb 25, 4:34 PM EST	Special Weather Statement	PHI	Monroe	41 min
Feb 25, 6:10 PM EST	Special Weather Statement	PHI	Delaware	35 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.