Alert archive / New Jersey / Severe Thunderstorm Warnings in 2017

Severe Thunderstorm Warning 80, NWS Philadelphia/Mount Holly

July 1, 2017Bucks County, Pennsylvania; 7 counties in New Jersey

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Jul 1, 2017, 5:50 PM EDT for Bucks County, Pennsylvania; 7 counties in New Jersey. It was in force for 40 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Jul 1, 2017, 5:50 PM EDT (21:50 UTC)
Expired: Jul 1, 2017, 6:30 PM EDT
In force: 40 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

Counties Hunterdon County, NJ, Mercer County, NJ, Middlesex County, NJ, Morris County, NJ, Somerset County, NJ, Sussex County, NJ, Warren County, NJ, Bucks County, PA

The radar

The Philadelphia radar (KDIX), 98 km from the middle of the area, began a volume at 21:50 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.

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 1, 1:34 PM EDT	Severe Thunderstorm Watch	SPC	7 hr

The nearest sounding before it

Brookhaven, NY (KOKX), launched 12:00Z, 9.8 hours before the alert went out and 137 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: 361 J/kg
Mixed-layer CIN: -56 J/kg
Mixed-layer LCL: 752 m above ground
0-6 km bulk shear: 37 kt
0-1 km storm-relative helicity: 98 m²/s²
0-3 km storm-relative helicity: 104 m²/s²
Significant tornado parameter: 0.1
Supercell composite: 1.0

Open this sounding in Storm Lab

The text

As transmitted.

349 
WUUS51 KPHI 012150
SVRPHI
NJC019-021-023-027-035-037-041-PAC017-012230-
/O.NEW.KPHI.SV.W.0080.170701T2150Z-170701T2230Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mount Holly NJ
550 PM EDT SAT JUL 1 2017

The National Weather Service in Mount Holly NJ has issued a

* Severe Thunderstorm Warning for...
  Morris County in northern New Jersey...
  Hunterdon County in northwestern New Jersey...
  Southern Sussex County in northwestern New Jersey...
  Northeastern Warren County in northwestern New Jersey...
  Mercer County in central New Jersey...
  Somerset County in northern New Jersey...
  Western Middlesex County in northern New Jersey...
  East central Bucks County in southeastern Pennsylvania...

* Until 630 PM EDT

* At 549 PM EDT, severe thunderstorms were located along a line
  extending from Great Meadows-Vienna to near Flemington to near
  Washington Crossing, moving northeast at 35 mph.

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

  SOURCE...Radar indicated. 

  IMPACT...Expect damage to trees and power lines. 

* Locations impacted include...
  Trenton, New Brunswick, Morristown, Somerville, Newton, Somerset,
  East Brunswick, Bridgewater, South Brunswick, North Brunswick,
  Ewing, Dover, Madison, Hopatcong, Middlesex, Princeton, Florham
  Park, East Hanover, Bound Brook and Manville.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4120 7437 4110 7449 4104 7450 4105 7445
      4102 7443 4100 7434 4091 7432 4082 7434
      4079 7437 4075 7436 4067 7446 4065 7440
      4060 7446 4060 7438 4032 7443 4018 7501
      4051 7491 4091 7502 4125 7446
TIME...MOT...LOC 2149Z 227DEG 31KT 4086 7491 4056 7484 4028 7492 

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

SFJ

2 follow-up statements

600 
WWUS51 KPHI 012210
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
610 PM EDT SAT JUL 1 2017

PAC017-012220-
/O.CAN.KPHI.SV.W.0080.000000T0000Z-170701T2230Z/
Bucks PA-
610 PM EDT SAT JUL 1 2017

...THE SEVERE THUNDERSTORM WARNING FOR EAST CENTRAL BUCKS 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 900 PM EDT for
central, northern and northwestern New Jersey...and southeastern
Pennsylvania.

LAT...LON 4120 7437 4109 7450 4104 7450 4105 7445
      4102 7443 4100 7434 4091 7432 4079 7437
      4075 7436 4067 7446 4065 7441 4060 7446
      4060 7438 4032 7443 4023 7480 4025 7483
      4059 7475 4098 7490
TIME...MOT...LOC 2210Z 234DEG 33KT 4096 7470 4066 7463 4038 7471 

$$

NJC019-021-023-027-035-037-041-012230-
/O.CON.KPHI.SV.W.0080.000000T0000Z-170701T2230Z/
Morris NJ-Hunterdon NJ-Sussex NJ-Warren NJ-Mercer NJ-Somerset NJ-
Middlesex NJ-
610 PM EDT SAT JUL 1 2017

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 630 PM EDT
FOR MORRIS...NORTHEASTERN HUNTERDON...SOUTHEASTERN SUSSEX...
NORTHEASTERN WARREN...CENTRAL MERCER...SOMERSET AND WESTERN MIDDLESEX
COUNTIES...

At 610 PM EDT, severe thunderstorms were located along a line
extending from near Hopatcong to near Far Hills to near Hopewell,
moving northeast at 40 mph.

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

SOURCE...Radar indicated. 

IMPACT...Expect damage to trees and power lines. 

Locations impacted include...
Trenton, New Brunswick, Morristown, Somerville, Newton, Somerset,
East Brunswick, Bridgewater, South Brunswick, North Brunswick, Ewing,
Dover, Madison, Hopatcong, Middlesex, Princeton, Florham Park, East
Hanover, Bound Brook and Manville.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4120 7437 4109 7450 4104 7450 4105 7445
      4102 7443 4100 7434 4091 7432 4079 7437
      4075 7436 4067 7446 4065 7441 4060 7446
      4060 7438 4032 7443 4023 7480 4025 7483
      4059 7475 4098 7490
TIME...MOT...LOC 2210Z 234DEG 33KT 4096 7470 4066 7463 4038 7471 

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

SFJ

069 
WWUS51 KPHI 012221
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
621 PM EDT SAT JUL 1 2017

NJC019-021-023-027-035-037-041-012230-
/O.EXP.KPHI.SV.W.0080.000000T0000Z-170701T2230Z/
Morris NJ-Hunterdon NJ-Sussex NJ-Warren NJ-Mercer NJ-Somerset NJ-
Middlesex NJ-
621 PM EDT SAT JUL 1 2017

...THE SEVERE THUNDERSTORM WARNING FOR MORRIS...NORTHEASTERN
HUNTERDON...SOUTHEASTERN SUSSEX...NORTHEASTERN WARREN...CENTRAL
MERCER...SOMERSET AND WESTERN MIDDLESEX COUNTIES WILL EXPIRE AT 630
PM EDT...
            
The storms which prompted the warning have weakened below severe
limits, and no longer pose an immediate threat to life or property.
Therefore the warning will be allowed to expire.  However gusty winds
are still possible with these thunderstorms.

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

LAT...LON 4120 7437 4109 7450 4104 7450 4105 7445
      4102 7443 4100 7434 4091 7432 4079 7437
      4075 7436 4067 7446 4065 7441 4060 7446
      4060 7438 4032 7443 4023 7480 4025 7483
      4059 7475 4098 7490
TIME...MOT...LOC 2220Z 227DEG 31KT 4101 7463 4071 7456 4043 7464 

$$

SFJ

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 30, 8:09 PM EDT	Special Weather Statement	PHI	Montgomery	51 min
Jun 30, 8:32 PM EDT	Areal Flood Advisory	PHI	Berks, Bucks, Lehigh, Montgomery	118 min
Jun 30, 9:17 PM EDT	Special Weather Statement	PHI	Bucks	43 min
Jul 1, 2:38 PM EDT	Special Weather Statement	PHI	Berks	52 min
Jul 1, 3:22 PM EDT	Special Weather Statement	PHI	Berks, Carbon	23 min
Jul 1, 3:24 PM EDT	Areal Flood Advisory	PHI	Berks, Lehigh	3 hr
Jul 1, 3:41 PM EDT	Severe Thunderstorm Warning	PHI	Berks, Lehigh, Northampton	49 min
Jul 1, 4:05 PM EDT	Special Weather Statement	PHI	Chester	40 min
Jul 1, 4:20 PM EDT	Flash Flood Warning	PHI	Berks, Lehigh	4 hr
Jul 1, 4:24 PM EDT	Severe Thunderstorm Warning	PHI	Berks, Bucks, Chester, Lehigh, Montgomery, Northampton	51 min
Jul 1, 5:00 PM EDT	Areal Flood Advisory	PHI	Bucks, Lehigh, Northampton	4 hr
Jul 1, 5:01 PM EDT	Severe Thunderstorm Warning	PHI	Bucks, Chester, Delaware, Montgomery, Philadelphia	44 min
Jul 1, 5:08 PM EDT	Severe Thunderstorm Warning	PHI	Bucks, Lehigh, Montgomery, Northampton	52 min
Jul 1, 5:30 PM EDT	Areal Flood Advisory	PHI	Bucks, Chester, Delaware, Montgomery, Philadelphia	4 hr
Jul 1, 5:35 PM EDT	Severe Thunderstorm Warning	PHI	Bucks, Delaware, Montgomery, Philadelphia	40 min
Jul 1, 6:17 PM EDT	Areal Flood Advisory	PHI	Monroe, Northampton	4 hr
Jun 30, 9:48 PM EDT	Special Weather Statement	PHI	Middlesex	42 min
Jun 30, 9:55 PM EDT	Special Weather Statement	PHI	Middlesex	20 min
Jun 30, 10:32 PM EDT	Special Weather Statement	PHI	Middlesex	28 min
Jul 1, 9:48 AM EDT	Marine Dense Fog Advisory	PHI		5 hr
Jul 1, 5:10 PM EDT	Special Marine Warning	PHI		95 min
Jul 1, 5:29 PM EDT	Special Weather Statement	PHI	Sussex	31 min
Jul 1, 5:41 PM EDT	Special Weather Statement	PHI	Atlantic, Cape May, Cumberland, Salem	34 min
Jul 1, 6:07 PM EDT	Special Weather Statement	PHI	Burlington, Camden, Gloucester, Mercer	23 min
Jul 1, 6:22 PM EDT	Special Weather Statement	PHI	Middlesex, Monmouth, Morris	23 min
Jul 1, 6:33 PM EDT	Special Weather Statement	PHI	Burlington, Camden, Cumberland, Gloucester	27 min
Jul 1, 6:59 PM EDT	Special Marine Warning	PHI		61 min
Jul 1, 7:01 PM EDT	Special Weather Statement	PHI	Atlantic, Burlington, Ocean	29 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.