Alert archive / New Jersey / Severe Thunderstorm Warnings in 2019

Severe Thunderstorm Warning 239, NWS Philadelphia/Mount Holly

July 21, 20195 counties in New Jersey

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Jul 21, 2019, 6:49 PM EDT for 5 counties in New Jersey. It was in force for 41 min. 20 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: Jul 21, 2019, 6:49 PM EDT (22:49 UTC)
Expired: Jul 21, 2019, 7:30 PM EDT
In force: 41 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

Counties Hunterdon County, NJ, Middlesex County, NJ, Morris County, NJ, Somerset County, NJ, Warren County, NJ

The radar

The Philadelphia radar (KDIX), 78 km from the middle of the area, began a volume at 22:50 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.

What was reported inside it

Time	Report	Where	Remark
Jul 21, 7:00 PM EDT	TSTM WND DMG	1 Wsw Peapack And Glads, NJ	DOWNED TREE AND WIRES ON FOWLER ROAD IN BEDMINSTER TWP. TIME ESTIMATED FROM RADAR.
Jul 21, 7:05 PM EDT	TSTM WND DMG	Far Hills, NJ	MPING REPORT OF DOWNED TREE LIMBS AND POWER POLES AT THIS LOCATION. TIME ESTIMATED FROM RADAR.
Jul 21, 7:14 PM EDT	TSTM WND DMG	2 Wnw Martinsville, NJ	SEVERAL DOWNED TREES AND POWER LINES ALONG AND EAST OF CRIM ROAD. TIME ESTIMATED FROM RADAR.
Jul 21, 7:16 PM EDT	TSTM WND DMG	1 Ssw Martinsville, NJ	SEVERAL REPORTS OF DOWNED TREES AND WIRES IN THE CHIMNEY ROCK AREA NEAR WASHINGTON VALLEY PARK AND RESERVOIR. TIME ESTIMATED FROM RADAR.
Jul 21, 7:17 PM EDT	TSTM WND DMG	1 Ese Martinsville, NJ	SEVERAL REPORTS OF DOWNED TREES ON PRIMROSE LANE. TIME ESTIMATED FROM RADAR.
Jul 21, 7:20 PM EDT	TSTM WND DMG	Bridgewater, NJ	PICTURE VIA SOCIAL MEDIA OF A TREE OR LARGE LIMB DOWN ONTO AND DAMAGING A DECK. TIME ESTIMATED FROM RADAR.
Jul 21, 7:21 PM EDT	TSTM WND DMG	Somerville, NJ	REPORTS OF TREES DOWN. PEA-SIZED HAIL ALSO REPORTED. TIME ESTIMATED FROM RADAR.
Jul 21, 7:21 PM EDT	HAIL 0.75	Bridgewater, NJ
Jul 21, 7:22 PM EDT	TSTM WND DMG	1 Wnw Bound Brook, NJ	WIRES DOWN WITH A TRANSFORMER FIRE ON WEST FRANKLIN ST.
Jul 21, 7:23 PM EDT	TSTM WND DMG	1 E Bridgewater, NJ	POLES AND WIRES DOWN ON NORTH BRIDGE ST. TIME ESTIMATED FROM RADAR.
Jul 21, 7:27 PM EDT	TSTM WND DMG	South Bound Brook, NJ	REPORTS OF LARGE TREES AND POWER LINES DOWN NEAR CHARLOTTE AVENUE AND MAPLE AVENUE. TIME ESTIMATED FROM RADAR AND NEARBY REPORTS.
Jul 21, 7:28 PM EDT	HAIL 0.75	1 S South Bound Brook, NJ
Jul 21, 7:29 PM EDT	TSTM WND DMG	2 Nne Manville, NJ	SEVERAL DOWNED TREES AND WIRES ON FOOTHILL ROAD NEAR ASCOT LANE AND JAMESTOWN ROAD. TIME ESTIMATED FROM RADAR.
Jul 21, 7:30 PM EDT	TSTM WND DMG	2 Nne Manville, NJ	WIRES DOWN AND BURNING ON FOOTHILL RD.
Jul 21, 7:31 PM EDT	TSTM WND DMG	1 Wnw Bound Brook, NJ	DOWNED TREE ON STATE HIGHWAY 28 BETWEEN VOSSELLER AVENUE AND MOUNTAIN AVENUE. ALL LANES CLOSED. TIME ESTIMATED FROM RADAR.
Jul 21, 7:32 PM EDT	HAIL 0.25	Bound Brook, NJ	MPING REPORT.
Jul 21, 7:32 PM EDT	HAIL 0.5	1 W Bound Brook, NJ	MPING REPORT.
Jul 21, 7:33 PM EDT	TSTM WND DMG	1 Wnw Bound Brook, NJ	TREE DOWN ON A HOUSE ON WASHINGTON STREET. TIME ESTIMATED FROM RADAR.
Jul 21, 7:35 PM EDT	HAIL 0.25	Middlesex, NJ	SOCIAL MEDIA PHOTO OF PEA SIZE HAIL ON A DECK. TIME ESTIMATED FROM RADAR.
Jul 21, 7:36 PM EDT	TSTM WND DMG	Bound Brook, NJ	DOWNED TREE AND WIRES AT A RESIDENCE ON HAMILTON STREET. 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, 10.8 hours before the alert went out and 139 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: 751 J/kg
Mixed-layer CIN: -122 J/kg
Mixed-layer LCL: 1554 m above ground
0-6 km bulk shear: 17 kt
0-1 km storm-relative helicity: 98 m²/s²
0-3 km storm-relative helicity: 136 m²/s²
Significant tornado parameter: 0.1
Supercell composite: 9.9

Open this sounding in Storm Lab

The text

As transmitted.

672 
WUUS51 KPHI 212249
SVRPHI
NJC019-023-027-035-041-212330-
/O.NEW.KPHI.SV.W.0239.190721T2249Z-190721T2330Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mount Holly NJ
649 PM EDT Sun Jul 21 2019

The National Weather Service in Mount Holly NJ has issued a

* Severe Thunderstorm Warning for...
  Southern Morris County in northern New Jersey...
  Northern Hunterdon County in northwestern New Jersey...
  Southern Warren County in northwestern New Jersey...
  Northern Somerset County in northern New Jersey...
  Northeastern Middlesex County in northern New Jersey...

* Until 730 PM EDT.

* At 648 PM EDT, severe thunderstorms were located along a line
  extending from near Peapack And Gladstone to near Lebanon to near
  Hampton, moving east at 35 mph.

  HAZARD...60 mph wind gusts.

  SOURCE...Radar indicated.

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

* Locations impacted include...
  Perth Amboy, Morristown, Somerville, Edison, Bridgewater, Carteret,
  Madison, Middlesex, Bound Brook, Manville, Chatham, Washington,
  Mendham, High Bridge, Clinton, Peapack And Gladstone, Glen Gardner,
  Chester, Hampton and Lebanon.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Wind damage with these storms will occur before any rain or
lightning. Do not wait for the sound of thunder before taking cover.
SEEK SHELTER IMMEDIATELY inside a sturdy structure and stay away from
windows.

&&

LAT...LON 4055 7425 4052 7425 4053 7494 4070 7516
      4081 7490 4086 7463 4074 7437 4067 7446
      4066 7445 4066 7440 4063 7442 4060 7446
      4060 7422 4056 7421
TIME...MOT...LOC 2248Z 287DEG 28KT 4075 7465 4067 7480 4068 7501 

HAIL...<.75IN
WIND...60MPH
 
$$

SFJ

2 follow-up statements

767 
WWUS51 KPHI 212258
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
658 PM EDT Sun Jul 21 2019

NJC019-023-027-035-041-212330-
/O.CON.KPHI.SV.W.0239.000000T0000Z-190721T2330Z/
Morris NJ-Hunterdon NJ-Warren NJ-Somerset NJ-Middlesex NJ-
658 PM EDT Sun Jul 21 2019

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 730 PM EDT
FOR SOUTHERN MORRIS...NORTHERN HUNTERDON...SOUTH CENTRAL WARREN...
NORTHERN SOMERSET AND NORTHEASTERN MIDDLESEX COUNTIES...

At 658 PM EDT, severe thunderstorms were located along a line
extending from Basking Ridge to near White House Station to High
Bridge, moving east at 30 mph.

HAZARD...60 mph wind gusts.

SOURCE...Radar indicated.

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

Locations impacted include...
Perth Amboy, Morristown, Somerville, Edison, Bridgewater, Carteret,
Madison, Middlesex, Bound Brook, Manville, Chatham, Mendham, High
Bridge, Clinton, Peapack And Gladstone, Glen Gardner, Chester,
Hampton, Lebanon and Califon.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Wind damage with these storms will occur before any rain or
lightning. Do not wait for the sound of thunder before taking cover.
SEEK SHELTER IMMEDIATELY inside a sturdy structure and stay away from
windows.

Frequent cloud to ground lightning is occurring with these storms.
Move indoors immediately. Lightning is one of nature's leading
killers. Remember, if you can hear thunder, you are close enough to
be struck by lightning.

&&

LAT...LON 4055 7425 4052 7425 4053 7494 4067 7512
      4077 7488 4082 7454 4074 7437 4067 7446
      4066 7445 4066 7440 4063 7442 4060 7446
      4060 7422 4056 7421
TIME...MOT...LOC 2258Z 287DEG 28KT 4073 7456 4065 7471 4066 7492 

HAIL...<.75IN
WIND...60MPH
 
$$

SFJ

735 
WWUS51 KPHI 212313
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
713 PM EDT Sun Jul 21 2019

NJC041-212322-
/O.CAN.KPHI.SV.W.0239.000000T0000Z-190721T2330Z/
Warren NJ-
713 PM EDT Sun Jul 21 2019

...THE SEVERE THUNDERSTORM WARNING FOR SOUTH CENTRAL WARREN COUNTY IS
CANCELLED...

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

LAT...LON 4055 7425 4052 7425 4053 7487 4065 7489
      4080 7450 4074 7437 4067 7446 4066 7445
      4066 7440 4063 7442 4060 7446 4060 7422
      4056 7421
TIME...MOT...LOC 2312Z 288DEG 24KT 4070 7447 4062 7462 4063 7483 

$$

NJC019-023-027-035-212330-
/O.CON.KPHI.SV.W.0239.000000T0000Z-190721T2330Z/
Morris NJ-Hunterdon NJ-Somerset NJ-Middlesex NJ-
713 PM EDT Sun Jul 21 2019

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 730 PM EDT
FOR SOUTHEASTERN MORRIS...EAST CENTRAL HUNTERDON...NORTHERN SOMERSET
AND NORTHEASTERN MIDDLESEX COUNTIES...

At 712 PM EDT, severe thunderstorms were located along a line
extending from near Millington to near Bridgewater to Lebanon, moving
east at 25 mph.

HAZARD...60 mph wind gusts.

SOURCE...Radar indicated.

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

Locations impacted include...
Perth Amboy, Morristown, Somerville, Edison, Bridgewater, Carteret,
Madison, Middlesex, Bound Brook, Manville, Chatham, Mendham, Peapack
And Gladstone, Lebanon, Far Hills, Colonia, Martinsville, Millington,
White House Station and Society Hill.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Wind damage with these storms will occur before any rain or
lightning. Do not wait for the sound of thunder before taking cover.
SEEK SHELTER IMMEDIATELY inside a sturdy structure and stay away from
windows.

Frequent cloud to ground lightning is occurring with these storms.
Move indoors immediately. Lightning is one of nature's leading
killers. Remember, if you can hear thunder, you are close enough to
be struck by lightning.

&&

LAT...LON 4055 7425 4052 7425 4053 7487 4065 7489
      4080 7450 4074 7437 4067 7446 4066 7445
      4066 7440 4063 7442 4060 7446 4060 7422
      4056 7421
TIME...MOT...LOC 2312Z 288DEG 24KT 4070 7447 4062 7462 4063 7483 

HAIL...<.75IN
WIND...60MPH
 
$$

SFJ

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 21, 3:15 AM EDT	Flash Flood Watch	PHI	Atlantic, Burlington, Camden, Cape May, Cumberland, Gloucester and 10 more	51 hr
Jul 21, 3:09 PM EDT	Heat Advisory	PHI	Burlington, Camden, Cape May, Cumberland, Gloucester, Mercer and 1 more	27 hr
Jul 21, 5:04 PM EDT	Special Weather Statement	PHI	Sussex	41 min
Jul 21, 5:34 PM EDT	Special Weather Statement	PHI	Sussex	41 min
Jul 21, 6:14 PM EDT	Special Weather Statement	PHI	Morris, Sussex, Warren	46 min
Jul 21, 6:16 PM EDT	Severe Thunderstorm Warning	PHI	Morris, Sussex	44 min
Jul 21, 6:38 PM EDT	Special Weather Statement	PHI	Hunterdon, Somerset	37 min
Jul 21, 7:23 PM EDT	Severe Thunderstorm Warning	PHI	Middlesex, Monmouth, Somerset	52 min

Nearby

Severe Thunderstorm Warnings in New Jersey, 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.