Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2015

Severe Thunderstorm Warning 20, NWS Philadelphia/Mount Holly

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

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at May 31, 2015, 4:33 PM EDT for Monroe County, Northampton County, Pennsylvania; Warren County, New Jersey. It was in force for 42 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
May 31, 2015, 4:33 PM EDT (20:33 UTC)
Expired
May 31, 2015, 5:15 PM EDT
In force
42 min
Issued by
NWS Philadelphia/Mount Holly
Area
Storm-based polygon

Counties Warren County, NJ, Monroe County, PA, Northampton County, PA

The radar

The Philadelphia radar (KDIX), 141 km from the middle of the area, began a volume at 20:33 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, 4:40 PM EDTTSTM WND DMG1 Ssw Hamilton Square, PALIMBS DOWN ON LINES

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, 8.6 hours before the alert went out and 191 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.

337 
WUUS51 KPHI 312033
SVRPHI
NJC041-PAC089-095-312115-
/O.NEW.KPHI.SV.W.0020.150531T2033Z-150531T2115Z/

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

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ  HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTHWESTERN WARREN COUNTY IN NORTHWESTERN NEW JERSEY...
  EASTERN MONROE COUNTY IN NORTHEASTERN PENNSYLVANIA...
  NORTHEASTERN NORTHAMPTON COUNTY IN EASTERN PENNSYLVANIA...

* UNTIL 515 PM EDT

* AT 432 PM EDT...DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM
  CAPABLE OF PRODUCING DAMAGING WINDS IN EXCESS OF 60 MPH. THIS STORM
  WAS LOCATED OVER PEN ARGYL...OR 14 MILES NORTH OF EASTON...AND
  MOVING NORTHEAST AT 30 MPH. PENNY SIZE HAIL MAY ALSO ACCOMPANY THE
  DAMAGING WINDS.

* THIS SEVERE THUNDERSTORM WILL BE NEAR...
  COLUMBIA AROUND 445 PM EDT.
  EAST STROUDSBURG...DELAWARE WATER GAP...DELAWARE WATER GAP AND
  ANALOMINK AROUND 450 PM EDT.
  HERNYVILLE AROUND 455 PM EDT.
  ALPINE MOUNTAIN AROUND 500 PM EDT.
  ECHO LAKE AND WERRY LAKE AROUND 505 PM EDT.
  MILLBROOK AROUND 510 PM EDT.

OTHER LOCATIONS IMPACTED BY THIS SEVERE THUNDERSTORM INCLUDE
BARTONSVILLE...HIDDEN LAKE...STROUDSBURG...SHAWNEE...MARSHALLS
CREEK...ROSETO...ARLINGTON HEIGHTS AND PORTLAND.

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.

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

&&

LAT...LON 4115 7515 4114 7513 4114 7509 4108 7503
      4110 7497 4104 7491 4082 7525 4089 7539
      4123 7515 4124 7513
TIME...MOT...LOC 2032Z 215DEG 25KT 4090 7526 

$$
1 follow-up statement
760 
WWUS51 KPHI 312058
SVSPHI

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

NJC041-PAC095-312106-
/O.CAN.KPHI.SV.W.0020.000000T0000Z-150531T2115Z/
WARREN NJ-NORTHAMPTON PA-
458 PM EDT SUN MAY 31 2015

...THE SEVERE THUNDERSTORM WARNING FOR NORTHWESTERN WARREN AND
NORTHEASTERN NORTHAMPTON COUNTIES IS CANCELLED...
    
THE SEVERE THUNDERSTORM WHICH PROMPTED THE WARNING HAS MOVED OUT OF 
NORTHAMPTON COUNTY AND SHOULD STAY OUT OF WESTERN WARREN COUNTY.

LAT...LON 4108 7503 4109 7497 4106 7502 4104 7503
      4099 7513 4097 7514 4097 7512 4095 7515
      4093 7522 4090 7523 4086 7530 4091 7538
      4115 7520
TIME...MOT...LOC 2056Z 207DEG 12KT 4097 7522 

$$

PAC089-312115-
/O.CON.KPHI.SV.W.0020.000000T0000Z-150531T2115Z/
MONROE PA-
458 PM EDT SUN MAY 31 2015

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 515 PM EDT
FOR SOUTHEASTERN MONROE COUNTY...

AT 456 PM EDT...DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM 
CAPABLE OF PRODUCING DAMAGING WINDS TO 60 MPH. THIS STORM WAS 
LOCATED OVER STORMVILLE...OR 12 MILES SOUTHEAST OF MOUNT POCONO... 
MOVING NORTHEAST AT 15 MPH.

THIS SEVERE STORM WILL BE NEAR...
  DELAWARE WATER GAP AROUND 505 PM EDT.
  DELAWARE WATER GAP AROUND 510 PM EDT.
  EAST STROUDSBURG...ANALOMINK...HERNYVILLE...ALPINE MOUNTAIN AND
ECHO LAKE AROUND 515 PM EDT.

OTHER LOCATIONS IMPACTED BY THIS SEVERE THUNDERSTORM INCLUDE
BARTONSVILLE...HIDDEN LAKE...STROUDSBURG...SHAWNEE...MARSHALLS CREEK
AND ARLINGTON HEIGHTS.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

SEVERE THUNDERSTORMS PRODUCE DAMAGING WINDS...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 4108 7503 4109 7497 4106 7502 4104 7503
      4099 7513 4097 7514 4097 7512 4095 7515
      4093 7522 4090 7523 4086 7530 4091 7538
      4115 7520
TIME...MOT...LOC 2056Z 207DEG 12KT 4097 7522 

$$

The office that day

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

IssuedProductOfficeCountiesLasted
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, 1:00 PM EDTSevere Thunderstorm WarningPHINorthampton45 min
May 31, 1:11 PM EDTFlash Flood WatchPHIBerks, Bucks, Carbon, Lehigh, Monroe, Northampton13 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
May 31, 7:57 PM EDTAreal Flood AdvisoryPHILehigh, Northampton6 hr
May 31, 1:24 PM EDTSpecial Weather StatementPHIMonmouth36 min
May 31, 2:00 PM EDTSpecial Weather StatementPHIMonmouth45 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

Nearby

Severe Thunderstorm Warnings in Pennsylvania, 2015Severe Thunderstorm Warnings in New Jersey, 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.