Alert archive / New Jersey / Severe Thunderstorm Warnings in 2019

Severe Thunderstorm Warning 360, NWS Philadelphia/Mount Holly

August 18, 2019Monroe County, Northampton County, Pennsylvania; 5 counties in New Jersey

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Aug 18, 2019, 6:40 PM EDT for Monroe County, Northampton County, Pennsylvania; 5 counties in New Jersey. It was in force for 54 min. 2 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 18, 2019, 6:40 PM EDT (22:40 UTC)
Expired: Aug 18, 2019, 7:34 PM EDT
In force: 54 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Hunterdon County, NJ, Morris County, NJ, Somerset County, NJ, Sussex County, NJ, Warren County, NJ, Monroe County, PA, Northampton County, PA

The radar

The Philadelphia radar (KDIX), 118 km from the middle of the area, began a volume at 22:42 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 18, 6:42 PM EDT	TSTM WND DMG	Blairstown, NJ	MULTIPLE REPORTS OF TREES AND WIRES DOWN ACROSS BLAIRSTOWN. TIME ESTIMATED FROM RADAR.
Aug 18, 6:50 PM EDT	TSTM WND DMG	1 Nw Allamuchy-Panther, NJ	SEVERAL REPORTS OF TREES DOWN ACROSS ALLAMUCHY. TIME ESTIMATED FROM RADAR.

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, 10.7 hours before the alert went out and 147 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: 1275 J/kg
Mixed-layer CIN: -19 J/kg
Mixed-layer LCL: 622 m above ground
0-6 km bulk shear: 28 kt
0-1 km storm-relative helicity: 50 m²/s²
0-3 km storm-relative helicity: 70 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.0

Open this sounding in Storm Lab

The text

As transmitted.

761 
WUUS51 KPHI 182240
SVRPHI
NJC019-027-035-037-041-PAC089-095-182345-
/O.NEW.KPHI.SV.W.0360.190818T2240Z-190818T2345Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mount Holly NJ
640 PM EDT Sun Aug 18 2019

The National Weather Service in Mount Holly NJ has issued a

* Severe Thunderstorm Warning for...
  Morris County in northern New Jersey...
  Northeastern Hunterdon County in northwestern New Jersey...
  Sussex County in northwestern New Jersey...
  Warren County in northwestern New Jersey...
  Northern Somerset County in northern New Jersey...
  East central Monroe County in northeastern Pennsylvania...
  Northeastern Northampton County in eastern Pennsylvania...

* Until 745 PM EDT.

* At 640 PM EDT, severe thunderstorms were located along a line
  extending from Flatbrookville to Hope to Belvidere, moving east at
  45 mph.

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

  SOURCE...Radar indicated.

  IMPACT...Minor damage to vehicles is possible. Wind damage to 
           roofs, siding, trees, and power lines is possible.

* Locations impacted include...
  Morristown, Port Jervis, Newton, Dover, Madison, Hopatcong, Florham
  Park, East Hanover, Lincoln Park, Kinnelon, Hackettstown, Chatham,
  Boonton, Butler, Wharton, Washington, Rockaway, Blairstown, Morris
  Plains and Bangor.

This includes the following highways...
 Interstate 287 in New Jersey between mile markers 22 and 54.
 Interstate 78 in New Jersey between mile markers 32 and 43.
 Interstate 80 in New Jersey between mile markers 1 and 47.

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 these storms. 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 4120 7437 4110 7449 4104 7450 4105 7445
      4102 7443 4100 7430 4090 7427 4091 7433
      4075 7436 4067 7446 4066 7440 4060 7445
      4082 7532 4096 7513 4113 7507 4108 7503
      4116 7490 4135 7475 4136 7469
TIME...MOT...LOC 2240Z 281DEG 40KT 4112 7495 4091 7501 4083 7509 

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

Staarmann

3 follow-up statements

141 
WWUS51 KPHI 182307
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
707 PM EDT Sun Aug 18 2019

PAC089-182317-
/O.CAN.KPHI.SV.W.0360.000000T0000Z-190818T2345Z/
Monroe PA-
707 PM EDT Sun Aug 18 2019

...THE SEVERE THUNDERSTORM WARNING FOR EAST CENTRAL MONROE COUNTY IS
CANCELLED...

The storms which prompted the warning have moved out of the warned 
area. Therefore, the warning has been cancelled.

LAT...LON 4120 7437 4110 7449 4104 7450 4105 7445
      4102 7443 4100 7430 4090 7427 4091 7433
      4075 7436 4067 7446 4082 7522 4095 7509
      4102 7496 4108 7487 4120 7468 4128 7453
TIME...MOT...LOC 2307Z 269DEG 34KT 4120 7444 4101 7462 4088 7480 

$$

NJC019-027-035-037-041-PAC095-182345-
/O.CON.KPHI.SV.W.0360.000000T0000Z-190818T2345Z/
Morris NJ-Hunterdon NJ-Sussex NJ-Warren NJ-Somerset NJ-
Northampton PA-
707 PM EDT Sun Aug 18 2019

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 745 PM EDT
FOR MORRIS...NORTHEASTERN HUNTERDON...SUSSEX...CENTRAL WARREN...NORTH
CENTRAL SOMERSET AND NORTHEASTERN NORTHAMPTON COUNTIES...

At 707 PM EDT, severe thunderstorms were located along a line
extending from near Highland Lake to near Lake Mohawk to near
Hackettstown, moving east at 40 mph.

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

SOURCE...Radar indicated.

IMPACT...Minor damage to vehicles is possible. Wind damage to roofs, 
         siding, trees, and power lines is possible.

Locations impacted include...
Morristown, Newton, Dover, Madison, Hopatcong, Florham Park, East
Hanover, Lincoln Park, Kinnelon, Hackettstown, Chatham, Boonton,
Butler, Wharton, Rockaway, Blairstown, Morris Plains, Mount
Arlington, Franklin and Mendham.

This includes the following highways...
 Interstate 287 in New Jersey between mile markers 27 and 54.
 Interstate 80 in New Jersey between mile markers 4 and 47.

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 4120 7437 4110 7449 4104 7450 4105 7445
      4102 7443 4100 7430 4090 7427 4091 7433
      4075 7436 4067 7446 4082 7522 4095 7509
      4102 7496 4108 7487 4120 7468 4128 7453
TIME...MOT...LOC 2307Z 269DEG 34KT 4120 7444 4101 7462 4088 7480 

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

Staarmann

476 
WWUS51 KPHI 182325
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
725 PM EDT Sun Aug 18 2019

NJC019-035-041-PAC095-182335-
/O.CAN.KPHI.SV.W.0360.000000T0000Z-190818T2345Z/
Hunterdon NJ-Warren NJ-Somerset NJ-Northampton PA-
725 PM EDT Sun Aug 18 2019

...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN HUNTERDON...
CENTRAL WARREN...NORTH CENTRAL SOMERSET AND NORTHEASTERN NORTHAMPTON
COUNTIES IS CANCELLED...

The storms which prompted the warning have moved out of the warned 
area. Therefore, the warning has been cancelled.

LAT...LON 4084 7434 4091 7474 4108 7455 4124 7445
      4120 7437 4110 7449 4104 7450 4105 7445
      4102 7443 4100 7430 4090 7427 4091 7433
TIME...MOT...LOC 2325Z 267DEG 32KT 4119 7431 4101 7442 4091 7457 

$$

NJC027-037-182345-
/O.CON.KPHI.SV.W.0360.000000T0000Z-190818T2345Z/
Morris NJ-Sussex NJ-
725 PM EDT Sun Aug 18 2019

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 745 PM EDT
FOR NORTHEASTERN MORRIS AND SOUTHEASTERN SUSSEX COUNTIES...

At 725 PM EDT, severe thunderstorms were located along a line
extending from near Greenwood Lake to near Kinnelon to Wharton,
moving east at 35 mph.

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

SOURCE...Radar indicated.

IMPACT...Damage to roofs, siding, trees, and power lines is 
         possible.

Locations impacted include...
Dover, Hopatcong, Lincoln Park, Kinnelon, Boonton, Butler, Wharton,
Rockaway, Mount Arlington, Mountain Lakes, Stanhope, Riverdale,
Netcong, Victory Gardens, Parsippany, Pequannock Township, Lake
Telemark, Green Pond, Highland Lake and Upper Greenwood Lake.

This includes the following highways...
 Interstate 287 in New Jersey between mile markers 42 and 54.
 Interstate 80 in New Jersey near mile marker 25, and between mile
markers 30 and 47.

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 4084 7434 4091 7474 4108 7455 4124 7445
      4120 7437 4110 7449 4104 7450 4105 7445
      4102 7443 4100 7430 4090 7427 4091 7433
TIME...MOT...LOC 2325Z 267DEG 32KT 4119 7431 4101 7442 4091 7457 

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

Staarmann

516 
WWUS51 KPHI 182334
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
734 PM EDT Sun Aug 18 2019

NJC027-037-182343-
/O.CAN.KPHI.SV.W.0360.000000T0000Z-190818T2345Z/
Morris NJ-Sussex NJ-
734 PM EDT Sun Aug 18 2019

...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN MORRIS AND
SOUTHEASTERN SUSSEX COUNTIES IS CANCELLED...
    
The storms which prompted the warning have weakened below severe 
limits and have exited the warned area. Therefore, the warning has 
been cancelled.  However heavy rain is still possible with these 
thunderstorms.

LAT...LON 4084 7434 4091 7474 4108 7455 4124 7445
      4120 7437 4110 7449 4104 7450 4105 7445
      4102 7443 4100 7430 4090 7427 4091 7433
TIME...MOT...LOC 2330Z 281DEG 40KT 4118 7423 4100 7434 4090 7449 

$$

Staarmann

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 17, 8:32 PM EDT	Special Weather Statement	PHI	Carbon, Monroe	73 min
Aug 18, 3:32 AM EDT	Heat Advisory	PHI	Berks, Bucks, Chester, Delaware, Lehigh, Montgomery and 2 more	4 days
Aug 18, 4:22 PM EDT	Special Weather Statement	PHI	Berks	38 min
Aug 18, 4:34 PM EDT	Severe Thunderstorm Warning	PHI	Berks, Montgomery	41 min
Aug 18, 4:36 PM EDT	Special Weather Statement	PHI	Bucks	24 min
Aug 18, 5:01 PM EDT	Areal Flood Advisory	PHI	Berks, Montgomery	3 hr
Aug 18, 5:16 PM EDT	Special Weather Statement	PHI	Berks	29 min
Aug 18, 5:25 PM EDT	Special Weather Statement	PHI	Carbon, Monroe, Northampton	65 min
Aug 18, 5:29 PM EDT	Areal Flood Advisory	PHI	Bucks, Lehigh, Northampton	2 hr
Aug 18, 5:36 PM EDT	Severe Thunderstorm Warning	PHI	Bucks	39 min
Aug 18, 5:38 PM EDT	Severe Thunderstorm Warning	PHI	Bucks, Lehigh, Northampton	52 min
Aug 18, 5:42 PM EDT	Special Weather Statement	PHI	Berks	48 min
Aug 18, 6:28 PM EDT	Special Weather Statement	PHI	Northampton	47 min
Aug 18, 7:03 PM EDT	Special Weather Statement	PHI	Berks	27 min
Aug 18, 7:23 PM EDT	Special Weather Statement	PHI	Berks	67 min
Aug 17, 10:37 PM EDT	Special Weather Statement	PHI	Morris	23 min
Aug 17, 10:50 PM EDT	Special Weather Statement	PHI	Morris	25 min
Aug 17, 11:19 PM EDT	Special Weather Statement	PHI	Morris	26 min
Aug 18, 3:03 PM EDT	Special Weather Statement	PHI	Burlington	27 min
Aug 18, 3:15 PM EDT	Special Weather Statement	PHI	Burlington	30 min
Aug 18, 3:21 PM EDT	Severe Thunderstorm Warning	PHI	Burlington, Ocean	39 min
Aug 18, 3:35 PM EDT	Special Weather Statement	PHI	Burlington	25 min
Aug 18, 4:48 PM EDT	Special Weather Statement	PHI	Somerset	27 min
Aug 18, 4:49 PM EDT	Special Weather Statement	PHI	Warren	26 min
Aug 18, 5:01 PM EDT	Special Weather Statement	PHI	Monmouth	29 min
Aug 18, 5:05 PM EDT	Special Weather Statement	PHI	Hunterdon	25 min
Aug 18, 5:18 PM EDT	Special Weather Statement	PHI	Somerset	27 min
Aug 18, 5:32 PM EDT	Severe Thunderstorm Warning	PHI	Hunterdon, Middlesex, Morris, Somerset	43 min
Aug 18, 5:46 PM EDT	Special Weather Statement	PHI	Warren	44 min
Aug 18, 5:57 PM EDT	Severe Thunderstorm Warning	PHI	Hunterdon, Morris, Warren	48 min
Aug 18, 7:09 PM EDT	Areal Flood Advisory	PHI	Morris, Sussex, Warren	3 hr

Nearby

Severe Thunderstorm Warnings in New Jersey, 2019 Severe Thunderstorm Warnings in Pennsylvania, 2019 Every severe thunderstorm warning in 2019

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.