Alert archive / New Jersey / Severe Thunderstorm Warnings in 2019

Severe Thunderstorm Warning 337, NWS Philadelphia/Mount Holly

August 7, 20195 counties in New Jersey

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Aug 7, 2019, 5:02 PM EDT for 5 counties in New Jersey. It was in force for 22 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 7, 2019, 5:02 PM EDT (21:02 UTC)
Expired
Aug 7, 2019, 5:24 PM EDT
In force
22 min
Issued by
NWS Philadelphia/Mount Holly
Area
Storm-based polygon
Hail
0.75 in
Wind
60.0 mph

Counties Mercer County, NJ, Middlesex County, NJ, Monmouth County, NJ, Morris County, NJ, Somerset County, NJ

The radar

The Philadelphia radar (KDIX), 66 km from the middle of the area, began a volume at 21:03 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

TimeReportWhereRemark
Aug 7, 5:07 PM EDTTSTM WND DMGMiddlesex, NJDOWNED TREE AND WIRES ON NJ-28 BOTH DIRECTIONS NEAR JOHN F KENNEDY DR. ALL LANES CLOSED AND DETOURED. TIME ESTIMATED FROM RADAR.
Aug 7, 5:32 PM EDTTSTM WND DMG2 Sw Lyons, NJDOWNED TREE ON INTERSTATE 78 EASTBOUND WEST OF EXIT 33. LEFT LANE BLOCKED. TIME ESTIMATED FROM RADAR.

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

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

IssuedProductOfficeLasted
Aug 7, 2:10 PM EDTSevere Thunderstorm WatchSPC7 hr

The nearest sounding before it

Brookhaven, NY (KOKX), launched 12:00Z, 9.0 hours before the alert went out and 128 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-pSkew-T log-p diagram, Brookhaven, NY at 12:00Z on 2019-08-07Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1372 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Brookhaven, NY at 12:00Z on 2019-08-07The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 92 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
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
1372 J/kg
Mixed-layer CIN
-14 J/kg
Mixed-layer LCL
652 m above ground
0-6 km bulk shear
29 kt
0-1 km storm-relative helicity
92 m²/s²
0-3 km storm-relative helicity
73 m²/s²
Significant tornado parameter
0.4
Supercell composite
3.0

Open this sounding in Storm Lab

The text

As transmitted.

657 
WUUS51 KPHI 072102
SVRPHI
NJC021-023-025-027-035-072145-
/O.NEW.KPHI.SV.W.0337.190807T2102Z-190807T2145Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mount Holly NJ
502 PM EDT Wed Aug 7 2019

The National Weather Service in Mount Holly NJ has issued a

* Severe Thunderstorm Warning for...
  South central Morris County in northern New Jersey...
  North central Mercer County in central New Jersey...
  Central Somerset County in northern New Jersey...
  North central Monmouth County in central New Jersey...
  Middlesex County in northern New Jersey...

* Until 545 PM EDT.

* At 501 PM EDT, severe thunderstorms were located along a line
  extending from near Tottenville to near Rocky Hill, moving
  northeast at 20 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...
  New Brunswick, Perth Amboy, Somerville, Somerset, Edison, Old
  Bridge, East Brunswick, South Brunswick, Sayreville, North
  Brunswick, Carteret, Middlesex, Princeton, Bound Brook, Manville,
  Keansburg, Matawan, Rocky Hill, Millstone and Brownville.

This includes the following highways...
 Garden State Parkway between mile markers 118 and 133.
 Interstate 287 in New Jersey between mile markers 0 and 19.

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.

&&

LAT...LON 4041 7416 4033 7471 4066 7462 4071 7442
      4067 7446 4066 7445 4066 7440 4060 7446
      4059 7420 4056 7421 4055 7425 4050 7426
      4050 7428 4046 7426 4044 7420 4046 7418
      4045 7413
TIME...MOT...LOC 2101Z 203DEG 17KT 4049 7425 4043 7462 

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

SFJ
2 follow-up statements
331 
WWUS51 KPHI 072117
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
517 PM EDT Wed Aug 7 2019

NJC021-023-025-027-035-072145-
/O.CON.KPHI.SV.W.0337.000000T0000Z-190807T2145Z/
Morris NJ-Mercer NJ-Somerset NJ-Monmouth NJ-Middlesex NJ-
517 PM EDT Wed Aug 7 2019

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 545 PM EDT
FOR SOUTH CENTRAL MORRIS...NORTH CENTRAL MERCER...CENTRAL SOMERSET...
NORTH CENTRAL MONMOUTH AND MIDDLESEX COUNTIES...

At 517 PM EDT, severe thunderstorms were located along a line
extending from Carteret to Millstone, moving northeast at 20 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...
New Brunswick, Perth Amboy, Somerville, Somerset, Edison, Old Bridge,
East Brunswick, South Brunswick, Sayreville, North Brunswick,
Carteret, Middlesex, Princeton, Bound Brook, Manville, Keansburg,
Matawan, Rocky Hill, Millstone and Brownville.

This includes the following highways...
 Garden State Parkway between mile markers 118 and 133.
 Interstate 287 in New Jersey between mile markers 0 and 19.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4041 7416 4033 7471 4066 7462 4071 7442
      4067 7446 4066 7445 4066 7440 4060 7446
      4059 7420 4056 7421 4055 7425 4050 7426
      4050 7428 4046 7426 4044 7420 4046 7418
      4045 7413
TIME...MOT...LOC 2117Z 203DEG 17KT 4056 7421 4050 7458 

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

SFJ
382 
WWUS51 KPHI 072124
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
524 PM EDT Wed Aug 7 2019

NJC021-023-025-027-035-072134-
/O.CAN.KPHI.SV.W.0337.000000T0000Z-190807T2145Z/
Morris NJ-Mercer NJ-Somerset NJ-Monmouth NJ-Middlesex NJ-
524 PM EDT Wed Aug 7 2019

...THE SEVERE THUNDERSTORM WARNING FOR SOUTH CENTRAL MORRIS...NORTH
CENTRAL MERCER...CENTRAL SOMERSET...NORTH CENTRAL MONMOUTH AND
MIDDLESEX COUNTIES IS CANCELLED...
            
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 has been cancelled.  However gusty winds are
still possible with these thunderstorms.

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

LAT...LON 4041 7416 4033 7471 4066 7462 4071 7442
      4067 7446 4066 7445 4066 7440 4060 7446
      4059 7420 4056 7421 4055 7425 4050 7426
      4050 7428 4046 7426 4044 7420 4046 7418
      4045 7413
TIME...MOT...LOC 2122Z 203DEG 17KT 4058 7420 4052 7457 

$$

SFJ

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 6, 8:05 PM EDTSevere Thunderstorm WarningPHIHunterdon, Morris, Warren55 min
Aug 7, 10:02 AM EDTFlash Flood WatchPHIBurlington, Camden, Gloucester, Hunterdon, Mercer, Middlesex and 5 more11 hr
Aug 7, 12:55 PM EDTSpecial Weather StatementPHIHunterdon35 min
Aug 7, 1:02 PM EDTAreal Flood AdvisoryPHIHunterdon, Morris, Somerset, Warren4 hr
Aug 7, 1:12 PM EDTSpecial Weather StatementPHIMonmouth33 min
Aug 7, 1:22 PM EDTSevere Thunderstorm WarningPHIHunterdon, Morris, Somerset, Warren38 min
Aug 7, 1:26 PM EDTSevere Thunderstorm WarningPHIBurlington, Mercer49 min
Aug 7, 1:33 PM EDTSpecial Marine WarningPHI42 min
Aug 7, 1:38 PM EDTSevere Thunderstorm WarningPHICape May52 min
Aug 7, 1:40 PM EDTSevere Thunderstorm WarningPHIMercer, Middlesex, Somerset50 min
Aug 7, 1:44 PM EDTSevere Thunderstorm WarningPHIMonmouth, Ocean46 min
Aug 7, 1:46 PM EDTFlash Flood WarningPHIHunterdon, Morris4 hr
Aug 7, 1:50 PM EDTSpecial Marine WarningPHI55 min
Aug 7, 1:52 PM EDTSevere Thunderstorm WarningPHIHunterdon, Morris, Somerset55 min
Aug 7, 2:01 PM EDTAreal Flood AdvisoryPHIBurlington, Mercer, Middlesex, Somerset97 min
Aug 7, 2:03 PM EDTSpecial Marine WarningPHI34 min
Aug 7, 2:07 PM EDTSevere Thunderstorm WarningPHIMercer, Middlesex, Monmouth38 min
Aug 7, 2:16 PM EDTSpecial Weather StatementPHICape May29 min
Aug 7, 2:18 PM EDTAreal Flood AdvisoryPHIMorris, Somerset3 hr
Aug 7, 2:21 PM EDTSpecial Marine WarningPHI23 min
Aug 7, 2:23 PM EDTSevere Thunderstorm WarningPHICape May19 min
Aug 7, 2:27 PM EDTSevere Thunderstorm WarningPHISussex, Warren32 min
Aug 7, 2:30 PM EDTSevere Thunderstorm WarningPHIMiddlesex, Monmouth45 min
Aug 7, 2:57 PM EDTAreal Flood AdvisoryPHIMiddlesex, Monmouth, Somerset3 hr
Aug 7, 3:05 PM EDTSevere Thunderstorm WarningPHIAtlantic, Burlington, Camden40 min
Aug 7, 3:07 PM EDTSevere Thunderstorm WarningPHIMonmouth53 min
Aug 7, 3:18 PM EDTSevere Thunderstorm WarningPHIHunterdon42 min
Aug 7, 3:24 PM EDTSevere Thunderstorm WarningPHIWarren51 min
Aug 7, 3:38 PM EDTSevere Thunderstorm WarningPHIAtlantic, Burlington, Camden, Ocean67 min
Aug 7, 3:42 PM EDTSpecial Weather StatementPHIMiddlesex33 min
Aug 7, 3:49 PM EDTAreal Flood AdvisoryPHIMiddlesex, Monmouth3 hr
Aug 7, 3:54 PM EDTSevere Thunderstorm WarningPHIHunterdon, Morris, Warren51 min
Aug 7, 3:59 PM EDTSevere Thunderstorm WarningPHIMiddlesex, Monmouth46 min
Aug 7, 4:03 PM EDTFlash Flood WarningPHIMiddlesex, Monmouth4 hr
Aug 7, 4:03 PM EDTSpecial Weather StatementPHIMercer42 min
Aug 7, 4:06 PM EDTAreal Flood AdvisoryPHIMercer, Middlesex, Somerset4 hr
Aug 7, 4:09 PM EDTSevere Thunderstorm WarningPHIBurlington, Camden, Mercer, Middlesex, Somerset66 min
Aug 7, 4:14 PM EDTSevere Thunderstorm WarningPHIHunterdon, Morris, Somerset, Sussex, Warren46 min
Aug 7, 4:20 PM EDTFlash Flood WarningPHIMercer4 hr
Aug 7, 4:27 PM EDTSevere Thunderstorm WarningPHIGloucester, Salem63 min
Aug 7, 4:34 PM EDTSevere Thunderstorm WarningPHIMercer, Middlesex, Monmouth41 min
Aug 7, 4:39 PM EDTFlash Flood WarningPHIMercer, Middlesex, Somerset6 hr
Aug 7, 5:03 PM EDTSpecial Marine WarningPHI42 min
Aug 7, 5:16 PM EDTSevere Thunderstorm WarningPHIBurlington, Camden, Gloucester, Mercer, Salem59 min
Aug 7, 5:34 PM EDTSpecial Marine WarningPHI56 min
Aug 7, 5:39 PM EDTSevere Thunderstorm WarningPHIBurlington, Camden, Cumberland, Gloucester, Salem51 min
Aug 7, 5:41 PM EDTSevere Thunderstorm WarningPHIMonmouth49 min
Aug 7, 5:57 PM EDTSevere Thunderstorm WarningPHIBurlington, Camden, Gloucester, Mercer, Middlesex, Monmouth and 1 more78 min
Aug 7, 6:01 PM EDTAreal Flood AdvisoryPHIBurlington, Camden, Cumberland, Gloucester, Mercer, Middlesex and 3 more3 hr
Aug 7, 6:21 PM EDTSevere Thunderstorm WarningPHIAtlantic, Burlington, Camden, Cape May, Cumberland, Gloucester and 2 more69 min
Aug 7, 6:27 PM EDTSpecial Marine WarningPHI63 min
Aug 7, 6:56 PM EDTSpecial Marine WarningPHI2 hr
Aug 7, 7:09 PM EDTSpecial Marine WarningPHI2 hr
Aug 7, 7:15 PM EDTSevere Thunderstorm WarningPHIAtlantic, Burlington, Camden, Gloucester, Monmouth, Ocean75 min
Aug 7, 7:42 PM EDTAreal Flood WarningPHIMercer3 hr

Nearby

Severe Thunderstorm Warnings in New Jersey, 2019Every 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.