Alert archive / New Jersey / Severe Thunderstorm Warnings in 2015

Severe Thunderstorm Warning 19, NWS Philadelphia/Mount Holly

May 31, 2015Hunterdon County, Warren County, New Jersey; Northampton County, Pennsylvania

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at May 31, 2015, 1:00 PM EDT for Hunterdon County, Warren County, New Jersey; Northampton County, Pennsylvania. It was in force for 45 min. 3 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
May 31, 2015, 1:00 PM EDT (17:00 UTC)
Expired
May 31, 2015, 1:45 PM EDT
In force
45 min
Issued by
NWS Philadelphia/Mount Holly
Area
Storm-based polygon

Counties Hunterdon County, NJ, Warren County, NJ, Northampton County, PA

The radar

The Philadelphia radar (KDIX), 103 km from the middle of the area, began a volume at 17:03 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
May 31, 1:12 PM EDTTSTM WND DMGPhillipsburg, NJMULTIPLE TREES REPORTED DOWN ON ROUTE 621/RIVER ROAD NORTH OF HARMONY STATION.
May 31, 1:15 PM EDTTSTM WND GST 57Forks Twp, PA
May 31, 1:15 PM EDTHAIL 0.25Forks Twp, PAPEA SIZE HAIL REPORTED IN FORKS TWP.

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, 5.0 hours before the alert went out and 185 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 2015-05-31Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 106 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 2015-05-31The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 41 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
106 J/kg
Mixed-layer CIN
-105 J/kg
Mixed-layer LCL
746 m above ground
0-6 km bulk shear
12 kt
0-1 km storm-relative helicity
41 m²/s²
0-3 km storm-relative helicity
41 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

967 
WUUS51 KPHI 311700
SVRPHI
NJC019-041-PAC095-311745-
/O.NEW.KPHI.SV.W.0019.150531T1700Z-150531T1745Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
100 PM EDT SUN MAY 31 2015

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ  HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  SOUTHWESTERN WARREN COUNTY IN NORTHWESTERN NEW JERSEY...
  NORTHWESTERN HUNTERDON COUNTY IN NORTHWESTERN NEW JERSEY...
  CENTRAL NORTHAMPTON COUNTY IN EASTERN PENNSYLVANIA...

* UNTIL 145 PM EDT

* AT 1259 PM EDT...DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM
  CAPABLE OF PRODUCING QUARTER SIZE HAIL AND DAMAGING WINDS IN EXCESS
  OF 60 MPH. THIS STORM WAS LOCATED OVER FORKS...OR OVER EASTON...AND
  MOVING NORTHEAST AT 20 MPH.  THERE ARE OTHER POTENTIALLY SEVERE
  STORMS IN SOUTHERN WARREN COUNTY AND SOUTHWEST NORTHAMPTON COUNTY.

* LOCATIONS IMPACTED INCLUDE...
  EASTON...BETHLEHEM...FORKS...WILSON...WASHINGTON...HELLERTOWN...
  NAZARETH...BELVIDERE...HARMONY...OXFORD...ALPHA...HOPE...GLEN
  GARDNER...BELFAST...HAMPTON...WEST EASTON...TATAMY...CALIFON...
  BLOOMSBURY AND RIEGELSVILLE.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

SEVERE THUNDERSTORMS PRODUCE DAMAGING WINDS...LARGE HAIL...DEADLY
LIGHTNING AND VERY HEAVY RAIN. FOR YOUR PROTECTION...MOVE TO AN
INTERIOR ROOM ON THE LOWEST FLOOR OF YOUR HOME OR BUSINESS. HEAVY
RAINS FLOOD ROADS QUICKLY SO DO NOT DRIVE INTO AREAS WHERE WATER
COVERS THE ROAD.

HEAVY RAINFALL IS ALSO OCCURRING WITH THIS STORM...AND MAY LEAD TO 
FLASH FLOODING. DO NOT DRIVE YOUR VEHICLE THROUGH FLOODED ROADWAYS.

&&

LAT...LON 4095 7495 4080 7486 4079 7489 4075 7482
      4071 7480 4060 7519 4061 7520 4058 7527
      4056 7532 4070 7540
TIME...MOT...LOC 1659Z 244DEG 17KT 4070 7524 

$$
2 follow-up statements
428 
WWUS51 KPHI 311730
SVSPHI

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
130 PM EDT SUN MAY 31 2015

PAC095-311738-
/O.CAN.KPHI.SV.W.0019.000000T0000Z-150531T1745Z/
NORTHAMPTON PA-
130 PM EDT SUN MAY 31 2015

...THE SEVERE THUNDERSTORM WARNING FOR CENTRAL NORTHAMPTON COUNTY IS
CANCELLED...
    
THE SEVERE THUNDERSTORM WHICH PROMPTED THE WARNING HAS MOVED OUT OF 
THE WARNED AREA. THEREFORE THE WARNING HAS BEEN CANCELLED. A WIND
GUST OF 57 MPH WAS REPORTED IN FORKS TOWNSHIP.

LAT...LON 4074 7487 4061 7516 4066 7519 4068 7517
      4069 7520 4075 7519 4078 7517 4077 7513
      4082 7508 4085 7510 4086 7505 4088 7506
      4093 7498
TIME...MOT...LOC 1728Z 240DEG 21KT 4073 7514 

$$

NJC019-041-311745-
/O.CON.KPHI.SV.W.0019.000000T0000Z-150531T1745Z/
WARREN NJ-HUNTERDON NJ-
130 PM EDT SUN MAY 31 2015

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 145 PM EDT
FOR SOUTHWESTERN WARREN AND NORTHWESTERN HUNTERDON COUNTIES...

AT 128 PM EDT...TRAINED WEATHER SPOTTERS REPORTED A SEVERE
THUNDERSTORM PRODUCING QUARTER SIZE HAIL AND DAMAGING WINDS IN EXCESS
OF 60 MPH. THIS STORM WAS LOCATED OVER HARMONY...OR NEAR EASTON...
MOVING NORTHEAST AT 25 MPH.

A WIND GUST OF 57 MPH WAS REPORTED WITH THIS STORM BY A SKYWARN
SPOTTER IN FORKS TOWNSHIP.

LOCATIONS IMPACTED INCLUDE...
WASHINGTON...BELVIDERE...HARMONY...OXFORD...ALPHA...HOPE...GLEN
GARDNER...HAMPTON...BLOOMSBURY...PLEASANT VALLEY...ROXBURG...BRASS
CASTLE AND PHILLIPSBURG.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

SEVERE THUNDERSTORMS PRODUCE DAMAGING WINDS...LARGE HAIL...DEADLY
LIGHTNING AND VERY HEAVY RAIN. FOR YOUR PROTECTION MOVE TO AN
INTERIOR ROOM ON THE LOWEST FLOOR OF YOUR HOME OR BUSINESS. HEAVY
RAINS FLOOD ROADS QUICKLY SO DO NOT DRIVE INTO AREAS WHERE WATER
COVERS THE ROAD.

TORRENTIAL RAINFALL IS ALSO OCCURRING WITH THIS STORM...AND MAY LEAD
TO FLASH FLOODING. DO NOT DRIVE YOUR VEHICLE THROUGH FLOODED
ROADWAYS.

&&

LAT...LON 4074 7487 4061 7516 4066 7519 4068 7517
      4069 7520 4075 7519 4078 7517 4077 7513
      4082 7508 4085 7510 4086 7505 4088 7506
      4093 7498
TIME...MOT...LOC 1728Z 240DEG 21KT 4073 7514 

$$
795 
WWUS51 KPHI 311743
SVSPHI

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
143 PM EDT SUN MAY 31 2015

NJC019-041-311753-
/O.EXP.KPHI.SV.W.0019.000000T0000Z-150531T1745Z/
WARREN NJ-HUNTERDON NJ-
143 PM EDT SUN MAY 31 2015

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHWESTERN WARREN AND
NORTHWESTERN HUNTERDON COUNTIES WILL EXPIRE AT 145 PM EDT...
    
THE SEVERE THUNDERSTORM WHICH PROMPTED THE WARNING HAS WEAKENED.   
THEREFORE THE WARNING WILL BE ALLOWED TO EXPIRE.

LAT...LON 4074 7487 4061 7516 4066 7519 4068 7517
      4069 7520 4075 7519 4078 7517 4077 7513
      4082 7508 4085 7510 4086 7505 4088 7506
      4093 7498
TIME...MOT...LOC 1740Z 244DEG 17KT 4073 7514 

$$

The office that day

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

IssuedProductOfficeCountiesLasted
May 31, 1:11 PM EDTFlash Flood WatchPHIHunterdon, Middlesex, Morris, Somerset, Sussex, Warren13 hr
May 31, 1:24 PM EDTSpecial Weather StatementPHIMonmouth36 min
May 31, 2:00 PM EDTSpecial Weather StatementPHIMonmouth45 min
May 31, 4:33 PM EDTSevere Thunderstorm WarningPHIWarren42 min
May 31, 5:57 PM EDTSmall Craft AdvisoryPHI6 hr
May 31, 6:11 PM EDTAreal Flood AdvisoryPHIMiddlesex, Somerset3 hr
May 31, 6:37 PM EDTFlash Flood WarningPHIMiddlesex5 hr
May 31, 6:50 PM EDTSevere Thunderstorm WarningPHIMiddlesex, Monmouth40 min
May 31, 7:57 PM EDTAreal Flood AdvisoryPHIHunterdon, Morris, Somerset, Sussex, Warren6 hr
May 30, 8:19 PM EDTSpecial Weather StatementPHICarbon56 min
May 30, 8:46 PM EDTSpecial Weather StatementPHILebanon29 min
May 30, 9:03 PM EDTAreal Flood AdvisoryPHIBerks3 hr
May 30, 9:11 PM EDTSpecial Weather StatementPHILebanon64 min
May 30, 9:20 PM EDTSpecial Weather StatementPHICarbon55 min
May 30, 9:36 PM EDTAreal Flood AdvisoryPHICarbon3 hr
May 31, 5:12 PM EDTSevere Thunderstorm WarningPHIMonroe63 min
May 31, 5:23 PM EDTSevere Thunderstorm WarningPHIBerks37 min
May 31, 5:42 PM EDTFlash Flood WarningPHICarbon, Monroe6 hr
May 31, 7:08 PM EDTSpecial Weather StatementPHILehigh82 min
May 31, 7:27 PM EDTAreal Flood AdvisoryPHIBerks, Lehigh5 hr
May 31, 7:46 PM EDTFlash Flood WarningPHIBerks, Lehigh4 hr
May 31, 7:48 PM EDTSevere Thunderstorm WarningPHIBerks35 min

Nearby

Severe Thunderstorm Warnings in New Jersey, 2015Severe Thunderstorm Warnings in Pennsylvania, 2015Every severe thunderstorm warning in 2015

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.