Alert archive / New Jersey / Severe Thunderstorm Warnings in 2017

Severe Thunderstorm Warning 151, NWS Philadelphia/Mount Holly

August 3, 20174 counties in New Jersey; Bucks County, Pennsylvania

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Aug 3, 2017, 5:07 PM EDT for 4 counties in New Jersey; Bucks County, Pennsylvania. It was in force for 38 min. 6 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: Aug 3, 2017, 5:07 PM EDT (21:07 UTC)
Expired: Aug 3, 2017, 5:45 PM EDT
In force: 38 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon
Hail: 1.25 in
Wind: 60.0 mph

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

The radar

The Philadelphia radar (KDIX), 36 km from the middle of the area, began a volume at 21:09 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
Aug 3, 5:27 PM EDT	TSTM WND DMG	Florence, NJ	THREE TREES DOWN BLOCKING RAILROAD TRACKS BETWEEN FLORENCE AND ROEBLING.
Aug 3, 5:27 PM EDT	TSTM WND DMG	Florence, NJ	TREE DOWN ON RAILROAD TRACKS BETWEEN FLORENCE AND ROEBLING.
Aug 3, 5:28 PM EDT	TSTM WND DMG	Tullytown, PA	APPROXIMATELY 20-FOOT TREE SNAPPED AND A LARGE DOWNED LIMB DAMAGED A CAR. TIME ESTIMATED FROM RADAR.
Aug 3, 5:30 PM EDT	HAIL 0.75	Bordentown, NJ	DIME SIZE HAIL REPORTED. TIME ESTIMATED FROM RADAR.
Aug 3, 5:32 PM EDT	HAIL 0.5	Florence, NJ
Aug 3, 5:42 PM EDT	TSTM WND GST 43	Newbold Nos, PA

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Brookhaven, NY (KOKX), launched 12:00Z, 9.1 hours before the alert went out and 181 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: 207 J/kg
Mixed-layer CIN: -75 J/kg
Mixed-layer LCL: 895 m above ground
0-6 km bulk shear: 11 kt
0-1 km storm-relative helicity: 42 m²/s²
0-3 km storm-relative helicity: 54 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

497 
WUUS51 KPHI 032107
SVRPHI
NJC005-021-025-029-PAC017-032145-
/O.NEW.KPHI.SV.W.0151.170803T2107Z-170803T2145Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mount Holly NJ
507 PM EDT THU AUG 3 2017

The National Weather Service in Mount Holly NJ has issued a

* Severe Thunderstorm Warning for...
  Northwestern Ocean County in southern New Jersey...
  Mercer County in central New Jersey...
  Northern Burlington County in southern New Jersey...
  Southwestern Monmouth County in central New Jersey...
  Southeastern Bucks County in southeastern Pennsylvania...

* Until 545 PM EDT

* At 506 PM EDT, a severe thunderstorm was located over Florence, or
  7 miles south of Trenton, moving northeast at 15 mph.

  HAZARD...60 mph wind gusts and half dollar size hail. 

  SOURCE...Radar indicated. 

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

* Locations impacted include...
  Trenton, Bensalem, Ewing, Willingboro, Lumberton, Princeton,
  Florence, Burlington, Bristol, Mount Holly, Riverside, Bordentown,
  Pennington, Beverly, Yardley, Tullytown, Allentown, Langhorne,
  Wrightstown and Florence-Roebling.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

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

&&

LAT...LON 4010 7439 4000 7458 3996 7486 4006 7499
      4008 7496 4012 7496 4012 7498 4028 7487
      4038 7467
TIME...MOT...LOC 2106Z 226DEG 11KT 4012 7478 

HAIL...1.25IN
WIND...60MPH
 
$$

CMS

1 follow-up statement

243 
WWUS51 KPHI 032122
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
522 PM EDT THU AUG 3 2017

NJC029-032131-
/O.CAN.KPHI.SV.W.0151.000000T0000Z-170803T2145Z/
Ocean NJ-
522 PM EDT THU AUG 3 2017

...THE SEVERE THUNDERSTORM WARNING FOR NORTHWESTERN OCEAN COUNTY IS
CANCELLED...
    
The severe thunderstorm which prompted the warning is no longer 
expected to affect the warned area. Therefore, the warning has been 
cancelled.

LAT...LON 4002 7489 4017 7495 4029 7459 4002 7454
TIME...MOT...LOC 2121Z 264DEG 5KT 4011 7476 

$$

NJC005-021-025-PAC017-032145-
/O.CON.KPHI.SV.W.0151.000000T0000Z-170803T2145Z/
Mercer NJ-Burlington NJ-Monmouth NJ-Bucks PA-
522 PM EDT THU AUG 3 2017

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 545 PM EDT
FOR SOUTHEASTERN MERCER...NORTHEASTERN BURLINGTON...SOUTHWESTERN
MONMOUTH AND SOUTHEASTERN BUCKS COUNTIES...

At 521 PM EDT, a severe thunderstorm was located over Florence, or 7
miles south of Trenton, moving east at 5 mph.

HAZARD...60 mph wind gusts and half dollar size hail. 55 mph wind 
         gusts have been reported with this storm.

SOURCE...Radar indicated. 

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

Locations impacted include...
Trenton, Willingboro, Florence, Burlington, Bristol, Bordentown,
Tullytown, Allentown, Langhorne, Wrightstown, Windsor,
Florence-Roebling, Jacksonville, Georgetown, Edinburg, Crosswicks,
White Horse, Mercerville-Hamilton Square, Langhorn and Levittown.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

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

&&

LAT...LON 4002 7489 4017 7495 4029 7459 4002 7454
TIME...MOT...LOC 2121Z 264DEG 5KT 4011 7476 

HAIL...1.25IN
WIND...60MPH
 
$$

CMS

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 3, 2:47 PM EDT	Special Marine Warning	PHI		58 min
Aug 3, 3:35 PM EDT	Special Marine Warning	PHI		85 min
Aug 3, 4:44 PM EDT	Special Weather Statement	PHI	Mercer	31 min
Aug 3, 4:47 PM EDT	Special Marine Warning	PHI		88 min
Aug 3, 4:51 PM EDT	Special Weather Statement	PHI	Salem	24 min
Aug 3, 5:17 PM EDT	Flash Flood Warning	PHI	Burlington, Mercer	4 hr
Aug 3, 5:42 PM EDT	Severe Thunderstorm Warning	PHI	Burlington, Mercer	48 min
Aug 3, 5:54 PM EDT	Special Weather Statement	PHI	Somerset	36 min
Aug 3, 6:06 PM EDT	Severe Thunderstorm Warning	PHI	Burlington	39 min
Aug 3, 6:38 PM EDT	Areal Flood Advisory	PHI	Burlington, Camden	4 hr
Aug 3, 6:50 PM EDT	Special Weather Statement	PHI	Mercer	55 min
Aug 3, 6:54 PM EDT	Special Weather Statement	PHI	Hunterdon	66 min
Aug 3, 7:25 PM EDT	Areal Flood Advisory	PHI	Hunterdon, Mercer	4 hr
Aug 3, 7:34 PM EDT	Special Weather Statement	PHI	Hunterdon, Mercer	41 min
Aug 3, 7:47 PM EDT	Special Weather Statement	PHI	Morris	43 min
Aug 3, 3:31 PM EDT	Special Weather Statement	PHI	Bucks, Philadelphia	44 min
Aug 3, 5:57 PM EDT	Special Weather Statement	PHI	Delaware	33 min
Aug 3, 6:15 PM EDT	Special Weather Statement	PHI	Philadelphia	30 min
Aug 3, 6:34 PM EDT	Special Weather Statement	PHI	Lehigh	41 min
Aug 3, 7:16 PM EDT	Special Weather Statement	PHI	Lehigh	44 min
Aug 3, 7:37 PM EDT	Special Weather Statement	PHI	Lehigh	38 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.