Alert archive / New Jersey / Severe Thunderstorm Warnings in 2018

Severe Thunderstorm Warning 83, NWS Philadelphia/Mount Holly

August 17, 20185 counties in New Jersey; Bucks County, Pennsylvania

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Aug 17, 2018, 8:17 PM EDT for 5 counties in New Jersey; Bucks County, Pennsylvania. It was in force for 43 min. 6 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 17, 2018, 8:17 PM EDT (00:17 UTC)
Expired
Aug 17, 2018, 9:00 PM EDT
In force
43 min
Issued by
NWS Philadelphia/Mount Holly
Area
Storm-based polygon
Hail
0.75 in
Wind
60.0 mph

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

The radar

The Philadelphia radar (KDIX), 106 km from the middle of the area, began a volume at 00:19 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 17, 8:17 PM EDTTSTM WND DMG1 Ne Penwell, NJTREE DOWN NEAR INTERSECTION OF RT 57 AND WATTERS RD. TIME ESTIMATED FROM RADAR.
Aug 17, 8:19 PM EDTTSTM WND DMG1 Ne Beattyestown, NJDOWNED TREE NEAR INTERSECTION OF ALLEN ROAD AND SUNNYVIEW AVENUE IN MANSFIELD TWP. ANOTHER DOWNED TREE AT ROUTE 57 NEAR WATTERS ROAD. TIME ESTIMATED FROM RADAR.
Aug 17, 8:19 PM EDTTSTM WND DMGWashington, NJSEVERAL REPORTS OF LARGE TREES DOWN IN WASHINGTON TWP...INCLUDING ON BRASS CASTLE ROAD AND ON BARTELY ROAD. TIME ESTIMATED FROM RADAR.
Aug 17, 8:23 PM EDTTSTM WND DMGHampton Junction, NJTREES DOWN ONTO WIRES. WIRES DOWNED.
Aug 17, 8:35 PM EDTTSTM WND GST 65Lebanon, NJ
Aug 17, 8:50 PM EDTTSTM WND DMGFar Hills, NJREPORT OF TREES DOWN IN FAR HILLS AND BRIDGEWATER TOWNSHIP. 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 17, 3:44 PM EDTSevere Thunderstorm WatchSPC7 hr

The nearest sounding before it

Brookhaven, NY (KOKX), launched 00:00Z, 0.3 hours before the alert went out and 168 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 00:00Z on 2018-08-18Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 802 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 00:00Z on 2018-08-18The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 59 square meters per square second.1939Sfc1 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
802 J/kg
Mixed-layer CIN
-65 J/kg
Mixed-layer LCL
900 m above ground
0-6 km bulk shear
14 kt
0-1 km storm-relative helicity
59 m²/s²
0-3 km storm-relative helicity
119 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

141 
WUUS51 KPHI 180017
SVRPHI
NJC019-027-035-037-041-PAC017-180100-
/O.NEW.KPHI.SV.W.0083.180818T0017Z-180818T0100Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mount Holly NJ
817 PM EDT FRI AUG 17 2018

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...
  Southwestern Sussex County in northwestern New Jersey...
  Warren County in northwestern New Jersey...
  Western Somerset County in northern New Jersey...
  North central Bucks County in southeastern Pennsylvania...

* Until 900 PM EDT.

* At 816 PM EDT, severe thunderstorms were located along a line
  extending from Blairstown to Beatyestown to Milford, moving
  northeast at 40 mph.

  HAZARD...60 mph wind gusts.

  SOURCE...Radar indicated.

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

* Locations impacted include...
  Morristown, Somerville, Newton, Bridgewater, Dover, Hopatcong,
  Manville, Hackettstown, Wharton, Washington, Rockaway, Blairstown,
  Morris Plains, Mount Arlington, Franklin, Mendham, Flemington,
  Mountain Lakes, Tinicum and High Bridge.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

To report severe weather, contact your nearest law enforcement
agency. They will send your report to the National Weather Service
office in Mount Holly NJ.

Torrential rainfall is occurring with these storms, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.

&&

LAT...LON 4114 7460 4092 7443 4045 7464 4043 7520
      4075 7508 4085 7507 4086 7505 4096 7506
TIME...MOT...LOC 0016Z 242DEG 36KT 4100 7498 4080 7484 4057 7508 

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

CMS
3 follow-up statements
357 
WWUS51 KPHI 180035
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
835 PM EDT FRI AUG 17 2018

NJC019-027-035-037-041-PAC017-180100-
/O.CON.KPHI.SV.W.0083.000000T0000Z-180818T0100Z/
Morris NJ-Hunterdon NJ-Sussex NJ-Warren NJ-Somerset NJ-Bucks PA-
835 PM EDT FRI AUG 17 2018

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 900 PM EDT
FOR MORRIS...HUNTERDON...SOUTHWESTERN SUSSEX...EASTERN WARREN...
WESTERN SOMERSET AND NORTH CENTRAL BUCKS COUNTIES...

At 835 PM EDT, severe thunderstorms were located along a line
extending from near Newton to Succasunna-Kenvil to near Byram, moving
northeast at 40 mph.

HAZARD...70 mph wind gusts.

SOURCE...Radar indicated.

IMPACT...Expect considerable tree damage. Damage is likely to mobile 
         homes, roofs, and outbuildings.

Locations impacted include...
Morristown, Somerville, Newton, Bridgewater, Dover, Hopatcong,
Manville, Hackettstown, Wharton, Washington, Rockaway, Morris Plains,
Mount Arlington, Franklin, Mendham, Flemington, Mountain Lakes,
Tinicum, High Bridge and Stanhope.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Remain alert for a possible tornado! Tornadoes can develop quickly
from severe thunderstorms. If you spot a tornado go at once into the
basement or small central room in a sturdy structure.

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

To report severe weather contact your nearest law enforcement agency.
They will send your report to the National Weather Service office in
Mount Holly NJ.

Torrential rainfall is occurring with these storms, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.

&&

LAT...LON 4114 7460 4092 7443 4045 7464 4043 7520
      4057 7515 4077 7496 4104 7485
TIME...MOT...LOC 0035Z 236DEG 36KT 4108 7478 4088 7464 4046 7501 

TORNADO...POSSIBLE
HAIL...<.75IN
WIND...70MPH
 
$$

CMS
874 
WWUS51 KPHI 180052
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
852 PM EDT FRI AUG 17 2018

NJC041-PAC017-180101-
/O.CAN.KPHI.SV.W.0083.000000T0000Z-180818T0100Z/
Warren NJ-Bucks PA-
852 PM EDT FRI AUG 17 2018

...THE SEVERE THUNDERSTORM WARNING FOR EASTERN WARREN AND NORTH
CENTRAL BUCKS COUNTIES 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 1100 PM EDT for
northern and northwestern New Jersey.

LAT...LON 4114 7460 4092 7443 4045 7464 4044 7490
      4044 7502 4059 7499 4078 7484 4091 7478
      4091 7477 4092 7478 4110 7469
TIME...MOT...LOC 0051Z 242DEG 36KT 4115 7460 4095 7446 4053 7483 

$$

NJC019-027-035-037-180100-
/O.CON.KPHI.SV.W.0083.000000T0000Z-180818T0100Z/
Morris NJ-Hunterdon NJ-Sussex NJ-Somerset NJ-
852 PM EDT FRI AUG 17 2018

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 900 PM EDT
FOR CENTRAL MORRIS...EASTERN HUNTERDON...SOUTH CENTRAL SUSSEX AND
WESTERN SOMERSET COUNTIES...

At 851 PM EDT, severe thunderstorms were located along a line
extending from Hamburg to near Lake Telemark to near Flemington,
moving northeast at 40 mph.

HAZARD...70 mph wind gusts.

SOURCE...Emergency management. Several reports of wind damage have 
         been received from Warren and Hunterdon Counties.

IMPACT...Expect considerable tree damage. Damage is likely to mobile 
         homes, roofs, and outbuildings.

Locations impacted include...
Morristown, Somerville, Bridgewater, Dover, Hopatcong, Manville,
Wharton, Rockaway, Morris Plains, Mount Arlington, Franklin, Mendham,
Flemington, Mountain Lakes, High Bridge, Stanhope, Netcong, Clinton,
Peapack And Gladstone and Ogdensburg.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Remain alert for a possible tornado! Tornadoes can develop quickly
from severe thunderstorms. If you spot a tornado go at once into the
basement or small central room in a sturdy structure.

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

To report severe weather contact your nearest law enforcement agency.
They will send your report to the National Weather Service office in
Mount Holly NJ.

Torrential rainfall is occurring with these storms, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.

&&

LAT...LON 4114 7460 4092 7443 4045 7464 4044 7490
      4044 7502 4059 7499 4078 7484 4091 7478
      4091 7477 4092 7478 4110 7469
TIME...MOT...LOC 0051Z 242DEG 36KT 4115 7460 4095 7446 4053 7483 

TORNADO...POSSIBLE
HAIL...<.75IN
WIND...70MPH
 
$$

CMS
110 
WWUS51 KPHI 180059
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
859 PM EDT FRI AUG 17 2018

NJC019-027-035-037-180109-
/O.EXP.KPHI.SV.W.0083.000000T0000Z-180818T0100Z/
Morris NJ-Hunterdon NJ-Sussex NJ-Somerset NJ-
859 PM EDT FRI AUG 17 2018

...THE SEVERE THUNDERSTORM WARNING FOR CENTRAL MORRIS...EASTERN
HUNTERDON...SOUTH CENTRAL SUSSEX AND WESTERN SOMERSET COUNTIES WILL
EXPIRE AT 900 PM EDT...
    
A severe thunderstorm watch remains in effect until 1100 PM EDT for
northern and northwestern New Jersey.

To report severe weather, contact your nearest law enforcement
agency. They will relay your report to the National Weather Service
in Mount Holly NJ.

Remember, a Severe Thunderstorm Warning remains in effect for 
portions of Morris, Sussex, Somerset, and Hunterdon Counties until 
930 pm.

LAT...LON 4114 7460 4092 7443 4045 7464 4044 7490
      4044 7502 4059 7499 4078 7484 4091 7478
      4091 7477 4092 7478 4110 7469
TIME...MOT...LOC 0059Z 242DEG 36KT 4118 7452 4098 7438 4056 7475 

$$

CMS

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 17, 8:47 PM EDTSevere Thunderstorm WarningPHIHunterdon, Mercer, Middlesex, Morris, Somerset, Sussex43 min
Aug 17, 8:48 PM EDTSpecial Weather StatementPHISussex27 min
Aug 17, 9:26 PM EDTSpecial Weather StatementPHIMercer, Middlesex, Somerset34 min
Aug 17, 10:59 PM EDTAreal Flood AdvisoryPHIHunterdon, Middlesex, Morris, Somerset, Warren75 min
Aug 17, 11:25 PM EDTSpecial Weather StatementPHISomerset35 min
Aug 17, 11:30 PM EDTFlash Flood WarningPHIHunterdon, Middlesex, Morris, Somerset4 hr
Aug 17, 11:41 PM EDTSevere Thunderstorm WarningPHIMiddlesex, Morris, Somerset34 min
Aug 17, 11:52 PM EDTSpecial Weather StatementPHIMiddlesex23 min
Aug 18, 12:56 AM EDTAreal Flood AdvisoryPHIGloucester, Salem4 hr
Aug 18, 2:37 AM EDTSpecial Weather StatementPHIOcean23 min
Aug 18, 2:38 AM EDTSpecial Marine WarningPHI52 min
Aug 18, 2:41 AM EDTSpecial Weather StatementPHIAtlantic, Cumberland34 min
Aug 18, 2:46 AM EDTSevere Thunderstorm WarningPHIOcean14 min
Aug 18, 3:15 AM EDTSpecial Marine WarningPHI30 min
Aug 18, 3:16 AM EDTFlash Flood WatchPHIBurlington, Camden, Gloucester, Hunterdon, Mercer, Middlesex and 7 more20 hr
Aug 18, 3:34 PM EDTSpecial Weather StatementPHISussex41 min
Aug 18, 3:40 PM EDTSmall Craft AdvisoryPHI45 hr
Aug 18, 4:14 PM EDTSpecial Weather StatementPHISussex46 min
Aug 18, 4:33 PM EDTSpecial Weather StatementPHIGloucester42 min
Aug 18, 5:16 PM EDTSpecial Weather StatementPHIBurlington, Camden44 min
Aug 18, 5:44 PM EDTAreal Flood AdvisoryPHIBurlington, Camden98 min
Aug 18, 5:55 PM EDTSpecial Weather StatementPHIBurlington35 min
Aug 18, 6:17 PM EDTSevere Thunderstorm WarningPHIBurlington, Ocean43 min
Aug 18, 6:31 PM EDTSpecial Marine WarningPHI119 min
Aug 18, 6:44 PM EDTSevere Thunderstorm WarningPHIOcean29 min
Aug 17, 8:04 PM EDTSpecial Weather StatementPHIMonroe41 min
Aug 17, 8:54 PM EDTSpecial Weather StatementPHICarbon, Monroe36 min
Aug 18, 3:20 PM EDTSpecial Weather StatementPHIChester40 min
Aug 18, 4:54 PM EDTSpecial Weather StatementPHIPhiladelphia21 min

Nearby

Severe Thunderstorm Warnings in New Jersey, 2018Severe Thunderstorm Warnings in Pennsylvania, 2018Every severe thunderstorm warning in 2018

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.