Alert archive / New Jersey / Severe Thunderstorm Warnings in 2017

Severe Thunderstorm Warning 45, NWS Philadelphia/Mount Holly

June 19, 20174 counties in New Jersey; Bucks County, Northampton County, Pennsylvania

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Jun 19, 2017, 3:56 PM EDT for 4 counties in New Jersey; Bucks County, Northampton County, Pennsylvania. It was in force for 49 min. 1 report 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
Jun 19, 2017, 3:56 PM EDT (19:56 UTC)
Expired
Jun 19, 2017, 4:45 PM EDT
In force
49 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, Warren County, NJ, Bucks County, PA, Northampton County, PA

The radar

The Philadelphia radar (KDIX), 90 km from the middle of the area, began a volume at 19:58 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
Jun 19, 4:15 PM EDTTSTM WND DMGKingwood Twp, NJA FEW TREES WERE BLOWN DOWN. 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
Jun 19, 11:13 AM EDTSevere Thunderstorm WatchSPC9 hr

The nearest sounding before it

Brookhaven, NY (KOKX), launched 12:00Z, 7.9 hours before the alert went out and 170 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 2017-06-19Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1007 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 2017-06-19The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 193 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
1007 J/kg
Mixed-layer CIN
-84 J/kg
Mixed-layer LCL
659 m above ground
0-6 km bulk shear
27 kt
0-1 km storm-relative helicity
193 m²/s²
0-3 km storm-relative helicity
184 m²/s²
Significant tornado parameter
0.2
Supercell composite
2.2

Open this sounding in Storm Lab

The text

As transmitted.

942 
WUUS51 KPHI 191956
SVRPHI
NJC019-027-035-041-PAC017-095-192045-
/O.NEW.KPHI.SV.W.0045.170619T1956Z-170619T2045Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mount Holly NJ
356 PM EDT MON JUN 19 2017

The National Weather Service in Mount Holly NJ has issued a

* Severe Thunderstorm Warning for...
  Southwestern Morris County in northern New Jersey...
  Hunterdon County in northwestern New Jersey...
  Southwestern Warren County in northwestern New Jersey...
  Northwestern Somerset County in northern New Jersey...
  Northwestern Bucks County in southeastern Pennsylvania...
  Southeastern Northampton County in eastern Pennsylvania...

* Until 445 PM EDT

* At 356 PM EDT, severe thunderstorms were located along a line
  extending from near Harmony to Riegelsville to Perkasie, moving
  northeast at 50 mph.

  HAZARD...60 mph wind gusts. 

  SOURCE...Radar indicated. 

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

* Severe thunderstorms will be near,
  Easton, Alpha and Milford around 400 PM EDT. 
  Washington, Bloomsbury, Pleasant Valley and Brass Castle around 
  405 PM EDT. 
  Byram, Tinicum, Clinton, Hampton and Ottsville around 410 PM EDT. 
  High Bridge, Glen Gardner, Frenchtown, Lebanon, Annandale and 
  Erwinna around 415 PM EDT. 
  Califon, Sand Brook, Long Valley and Sergeantsville around 420 PM 
  EDT. 
  Flemington around 425 PM EDT. 
  Peapack And Gladstone, Chester, Succasunna-Kenvil and Succasunna 
  around 430 PM EDT. 
  Dover, Wharton, Mendham and White House Station around 435 PM EDT. 

Other locations impacted by these severe thunderstorms include
Telford, Sellersville, Raritan, Bernardsville, Richlandtown,
Phillipsburg and Silverdale.

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 this storm. 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 4089 7458 4088 7451 4057 7456 4032 7533
      4052 7533 4070 7518
TIME...MOT...LOC 1956Z 242DEG 45KT 4071 7514 4059 7518 4035 7530 

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

Drag
1 follow-up statement
278 
WWUS51 KPHI 192016
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
416 PM EDT MON JUN 19 2017

PAC095-192026-
/O.CAN.KPHI.SV.W.0045.000000T0000Z-170619T2045Z/
Northampton PA-
416 PM EDT MON JUN 19 2017

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN NORTHAMPTON
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 800 PM EDT for
northern and northwestern New Jersey...and southeastern Pennsylvania.

LAT...LON 4089 7458 4088 7451 4057 7456 4036 7522
      4061 7507 4075 7503
TIME...MOT...LOC 2016Z 244DEG 31KT 4075 7503 4062 7501 4039 7514 

$$

NJC019-027-035-041-PAC017-192045-
/O.CON.KPHI.SV.W.0045.000000T0000Z-170619T2045Z/
Morris NJ-Hunterdon NJ-Warren NJ-Somerset NJ-Bucks PA-
416 PM EDT MON JUN 19 2017

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 445 PM EDT
FOR SOUTHWESTERN MORRIS...HUNTERDON...SOUTH CENTRAL WARREN...
NORTHWESTERN SOMERSET AND NORTH CENTRAL BUCKS COUNTIES...

At 416 PM EDT, severe thunderstorms were located along a line
extending from Pleasant Valley to near Bloomsbury to Gardenville,
moving northeast at 35 mph.

HAZARD...60 mph wind gusts. 

SOURCE...Radar indicated. 

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

These severe storms will be near...
  Washington, Glen Gardner, Hampton, Brass Castle and Pleasant 
  Valley around 420 PM EDT. 
  Clinton and Annandale around 425 PM EDT. 
  High Bridge, Frenchtown and Lebanon around 430 PM EDT. 
  Califon, Beatyestown and White House Station around 435 PM EDT. 
  Sand Brook and Long Valley around 440 PM EDT. 
  Mendham, Flemington, Peapack And Gladstone, Chester, Far Hills, 
  Succasunna and Succasunna-Kenvil around 445 PM EDT. 

Other locations impacted by these severe thunderstorms include
Raritan and Bernardsville.

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 this storm. 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 4089 7458 4088 7451 4057 7456 4036 7522
      4061 7507 4075 7503
TIME...MOT...LOC 2016Z 244DEG 31KT 4075 7503 4062 7501 4039 7514 

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

Drag

The office that day

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

IssuedProductOfficeCountiesLasted
Jun 19, 12:03 PM EDTSpecial Weather StatementPHISussex27 min
Jun 19, 2:33 PM EDTAreal Flood AdvisoryPHISussex4 hr
Jun 19, 2:57 PM EDTSevere Thunderstorm WarningPHISussex, Warren48 min
Jun 19, 3:17 PM EDTFlash Flood WarningPHISussex, Warren3 hr
Jun 19, 3:35 PM EDTSevere Thunderstorm WarningPHIWarren25 min
Jun 19, 3:45 PM EDTSpecial Weather StatementPHISussex15 min
Jun 19, 3:53 PM EDTSevere Thunderstorm WarningPHIMorris, Sussex, Warren37 min
Jun 19, 3:54 PM EDTAreal Flood AdvisoryPHIHunterdon, Mercer, Morris, Somerset, Warren3 hr
Jun 19, 4:07 PM EDTSevere Thunderstorm WarningPHIGloucester, Salem38 min
Jun 19, 4:24 PM EDTSpecial Marine WarningPHI36 min
Jun 19, 4:28 PM EDTSpecial Weather StatementPHISussex17 min
Jun 19, 4:34 PM EDTSevere Thunderstorm WarningPHICamden, Gloucester, Mercer, Salem41 min
Jun 19, 4:42 PM EDTAreal Flood AdvisoryPHIBurlington, Camden, Cumberland, Gloucester, Salem3 hr
Jun 19, 4:51 PM EDTSpecial Weather StatementPHIGloucester39 min
Jun 19, 4:58 PM EDTSpecial Weather StatementPHIUnion32 min
Jun 19, 5:05 PM EDTSpecial Marine WarningPHI55 min
Jun 19, 5:06 PM EDTAreal Flood AdvisoryPHIMercer, Middlesex, Monmouth, Somerset3 hr
Jun 19, 5:09 PM EDTSevere Thunderstorm WarningPHIBurlington, Camden, Gloucester, Mercer, Middlesex, Monmouth and 2 more51 min
Jun 19, 5:15 PM EDTSevere Thunderstorm WarningPHIBurlington, Camden, Cumberland, Gloucester, Salem45 min
Jun 19, 5:28 PM EDTSevere Thunderstorm WarningPHICumberland62 min
Jun 19, 5:41 PM EDTSpecial Marine WarningPHI64 min
Jun 19, 5:44 PM EDTAreal Flood AdvisoryPHIAtlantic, Burlington, Camden, Cape May, Cumberland, Gloucester and 1 more3 hr
Jun 19, 5:46 PM EDTAreal Flood AdvisoryPHIAtlantic, Burlington, Mercer, Middlesex, Monmouth, Ocean3 hr
Jun 19, 5:52 PM EDTSpecial Weather StatementPHIAtlantic, Monmouth, Ocean38 min
Jun 19, 5:53 PM EDTSpecial Marine WarningPHI67 min
Jun 19, 6:01 PM EDTSpecial Weather StatementPHICumberland44 min
Jun 19, 6:13 PM EDTSpecial Marine WarningPHI92 min
Jun 19, 6:47 PM EDTSevere Thunderstorm WarningPHIAtlantic, Cape May, Cumberland43 min
Jun 19, 7:08 PM EDTSpecial Marine WarningPHI52 min
Jun 19, 7:20 PM EDTSevere Thunderstorm WarningPHIAtlantic, Ocean25 min
Jun 19, 7:33 PM EDTSpecial Marine WarningPHI57 min
Jun 19, 12:24 PM EDTSpecial Weather StatementPHIMonroe21 min
Jun 19, 12:44 PM EDTSpecial Weather StatementPHICarbon31 min
Jun 19, 12:46 PM EDTSpecial Weather StatementPHIBerks29 min
Jun 19, 12:55 PM EDTSevere Thunderstorm WarningPHICarbon, Monroe50 min
Jun 19, 1:25 PM EDTSpecial Weather StatementPHILehigh35 min
Jun 19, 1:29 PM EDTAreal Flood AdvisoryPHIBerks, Carbon, Lehigh, Monroe, Northampton4 hr
Jun 19, 1:42 PM EDTSpecial Weather StatementPHIBerks63 min
Jun 19, 2:08 PM EDTSevere Thunderstorm WarningPHIBerks52 min
Jun 19, 2:20 PM EDTSpecial Weather StatementPHINorthampton40 min
Jun 19, 2:25 PM EDTSpecial Weather StatementPHIBerks50 min
Jun 19, 2:38 PM EDTSpecial Weather StatementPHIPhiladelphia22 min
Jun 19, 2:43 PM EDTSpecial Weather StatementPHIBerks, Lehigh, Northampton47 min
Jun 19, 2:49 PM EDTSevere Thunderstorm WarningPHIBerks, Lehigh, Montgomery, Northampton41 min
Jun 19, 2:53 PM EDTSevere Thunderstorm WarningPHICarbon, Monroe52 min
Jun 19, 3:08 PM EDTSevere Thunderstorm WarningPHIBerks, Chester, Montgomery52 min
Jun 19, 3:24 PM EDTFlash Flood WarningPHICarbon, Lehigh, Monroe, Northampton3 hr
Jun 19, 3:25 PM EDTSpecial Weather StatementPHIChester50 min
Jun 19, 3:35 PM EDTAreal Flood AdvisoryPHIBerks, Bucks, Chester, Delaware, Montgomery, Philadelphia3 hr
Jun 19, 4:07 PM EDTSevere Thunderstorm WarningPHIChester, Delaware, Montgomery38 min

Nearby

Severe Thunderstorm Warnings in New Jersey, 2017Severe Thunderstorm Warnings in Pennsylvania, 2017Every 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.