Alert archive / New Jersey / Severe Thunderstorm Warnings in 2017

Severe Thunderstorm Warning 152, NWS Philadelphia/Mount Holly

August 3, 2017Burlington County, Mercer County, New Jersey; Bucks County, Pennsylvania

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Aug 3, 2017, 5:42 PM EDT for Burlington County, Mercer County, New Jersey; Bucks County, Pennsylvania. It was in force for 48 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: Aug 3, 2017, 5:42 PM EDT (21:42 UTC)
Expired: Aug 3, 2017, 6:30 PM EDT
In force: 48 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, Bucks County, PA

The radar

The Philadelphia radar (KDIX), 25 km from the middle of the area, began a volume at 21:42 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, 5:42 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, 9.7 hours before the alert went out and 169 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.

905 
WUUS51 KPHI 032142
SVRPHI
NJC005-021-PAC017-032230-
/O.NEW.KPHI.SV.W.0152.170803T2142Z-170803T2230Z/

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

The National Weather Service in Mount Holly NJ has issued a

* Severe Thunderstorm Warning for...
  Southeastern Mercer County in central New Jersey...
  Northeastern Burlington County in southern New Jersey...
  Southeastern Bucks County in southeastern Pennsylvania...

* Until 630 PM EDT

* At 541 PM EDT, a severe thunderstorm was located over Columbus, or
  8 miles south of Trenton, moving east at 5 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...
  Trenton, Florence, Mount Holly, Bordentown, Tullytown, Allentown,
  Wrightstown, Crosswicks, White Horse, Florence-Roebling, Jobstown,
  Columbus, Jacksonville, Georgetown, Browns Mills, Levittown,
  Mercerville-Hamilton Square, Fieldsboro, Yardville-Groveville and
  Fort Dix.

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 3997 7451 3999 7481 4017 7484 4024 7454
      4022 7454 4019 7456 4018 7459 4018 7461
      4002 7452
TIME...MOT...LOC 2141Z 275DEG 6KT 4010 7474 

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

CMS

1 follow-up statement

571 
WWUS51 KPHI 032158
SVSPHI

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

NJC021-032208-
/O.CAN.KPHI.SV.W.0152.000000T0000Z-170803T2230Z/
Mercer NJ-
558 PM EDT THU AUG 3 2017

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN MERCER COUNTY IS
CANCELLED...
    
The severe thunderstorm which prompted the warning has moved out of 
the warned area. Therefore, the warning has been cancelled.

LAT...LON 3999 7481 4007 7483 4018 7478 4017 7473
      4015 7472 4017 7471 4015 7463 4013 7458
      4002 7452 3997 7452
TIME...MOT...LOC 2158Z 300DEG 6KT 4008 7471 

$$

NJC005-PAC017-032230-
/O.CON.KPHI.SV.W.0152.000000T0000Z-170803T2230Z/
Burlington NJ-Bucks PA-
558 PM EDT THU AUG 3 2017

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 630 PM EDT
FOR NORTHEASTERN BURLINGTON AND SOUTHEASTERN BUCKS COUNTIES...

At 558 PM EDT, a severe thunderstorm was located over Columbus, or 10
miles south of Trenton, moving southeast at 5 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...
Florence, Mount Holly, Bordentown, Tullytown, Wrightstown,
Crosswicks, Florence-Roebling, Jobstown, Columbus, Jacksonville,
Georgetown, Browns Mills, Fieldsboro, Fort Dix, McGuire AFB 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 this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.

&&

LAT...LON 3999 7481 4007 7483 4018 7478 4017 7473
      4015 7472 4017 7471 4015 7463 4013 7458
      4002 7452 3997 7452
TIME...MOT...LOC 2158Z 300DEG 6KT 4008 7471 

HAIL...1.00IN
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, 5:07 PM EDT	Severe Thunderstorm Warning	PHI	Burlington, Mercer, Monmouth, Ocean	38 min
Aug 3, 5:17 PM EDT	Flash Flood Warning	PHI	Burlington, Mercer	4 hr
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.