Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2007

Severe Thunderstorm Warning 39, NWS Philadelphia/Mount Holly

June 1, 2007Northampton County, Pennsylvania

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Jun 1, 2007, 3:53 PM EDT for Northampton County, Pennsylvania. It was in force for 82 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued
Jun 1, 2007, 3:53 PM EDT (19:53 UTC)
Expired
Jun 1, 2007, 5:15 PM EDT
In force
82 min
Issued by
NWS Philadelphia/Mount Holly
Area
Counties, with a storm outline in the text

County Northampton County, PA

The radar

The Philadelphia radar (KDIX), 120 km from the middle of the area, began a volume at 19:53 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.

The nearest sounding before it

Phillips Aaf/Abe, MD (KAPG), launched 12:00Z, 7.9 hours before the alert went out and 177 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, Phillips Aaf/Abe, MD at 12:00Z on 2007-06-01Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 116 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, Phillips Aaf/Abe, MD at 12:00Z on 2007-06-01The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 43 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
116 J/kg
Mixed-layer CIN
-220 J/kg
Mixed-layer LCL
1070 m above ground
0-6 km bulk shear
10 kt
0-1 km storm-relative helicity
43 m²/s²
0-3 km storm-relative helicity
104 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.

000 
WUUS51 KPHI 011953
SVRPHI
PAC095-012115-
/O.NEW.KPHI.SV.W.0039.070601T1953Z-070601T2115Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
353 PM EDT FRI JUN 1 2007

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTHEASTERN NORTHAMPTON COUNTY IN EASTERN PENNSYLVANIA...

* UNTIL 515 PM EDT

* AT 349 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE HAIL...AND
  DAMAGING WINDS IN EXCESS OF 60 MPH.  THIS STORM WAS LOCATED 8 MILES
  NORTH OF EAST BANGOR...AND MOVING SOUTHEAST AT 10 MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  EAST BANGOR BY 425 PM EDT...

THIS IS A DANGEROUS STORM. IF YOU ARE IN ITS PATH...PREPARE
IMMEDIATELY FOR DAMAGING WINDS...DESTRUCTIVE HAIL...AND DEADLY CLOUD
TO GROUND LIGHTNING. PEOPLE OUTSIDE SHOULD MOVE TO A SHELTER...
PREFERABLY INSIDE A STRONG BUILDING BUT AWAY FROM WINDOWS.

THIS STORM HAS A HISTORY OF PRODUCING DESTRUCTIVE WINDS AND LARGE
HAIL IN SMITHFIELD TOWNSHIP IN MONORE COUNTY. SEEK SHELTER NOW 
INSIDE A STURDY STRUCTURE AND STAY AWAY FROM WINDOWS

LAT...LON 4094 7512 4091 7509 4086 7505 4084 7510
      4081 7509 4079 7511 4080 7512 4091 7524
      4093 7521 4096 7514

$$

TFG
1 follow-up statement
000 
WWUS51 KPHI 012030
SVSPHI

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
430 PM EDT FRI JUN 1 2007

PAC095-012115-
/O.CON.KPHI.SV.W.0039.000000T0000Z-070601T2115Z/
NORTHAMPTON PA-
430 PM EDT FRI JUN 1 2007

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 515 PM EDT
FOR NORTHEASTERN NORTHAMPTON COUNTY...

AT 425 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A SEVERE THUNDERSTORM CAPABLE OF PRODUCING NICKEL SIZE
HAIL...AND DAMAGING WINDS IN EXCESS OF 60 MPH.  THIS STORM WAS
LOCATED 7 MILES NORTH OF EAST BANGOR...OR ABOUT 25 MILES NORTHEAST OF
BETHLEHEM...MOVING SOUTHEAST AT 5 MPH.

THE SEVERE THUNDERSTORM WILL BE NEAR...
  6 MILES NORTHEAST OF EAST BANGOR BY 505 PM EDT...

THIS IS A DANGEROUS STORM. IF YOU ARE IN ITS PATH...PREPARE
IMMEDIATELY FOR DAMAGING WINDS...DESTRUCTIVE HAIL...AND DEADLY CLOUD
TO GROUND LIGHTNING. PEOPLE OUTSIDE SHOULD MOVE TO A SHELTER...
PREFERABLY INSIDE A STRONG BUILDING BUT AWAY FROM WINDOWS.

LAT...LON 4094 7512 4091 7509 4086 7505 4084 7510
      4081 7509 4079 7511 4080 7512 4091 7524
      4093 7521 4096 7514

$$

 
TFG

The office that day

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

IssuedProductOfficeCountiesLasted
May 31, 8:19 PM EDTFlash Flood WarningPHIBerks, Lehigh116 min
May 31, 8:30 PM EDTSevere Thunderstorm WarningPHIBerks, Lehigh45 min
May 31, 8:50 PM EDTSevere Thunderstorm WarningPHILehigh40 min
May 31, 9:33 PM EDTSevere Thunderstorm WarningPHILehigh34 min
May 31, 9:50 PM EDTFlash Flood WarningPHILehigh3 hr
May 31, 11:27 PM EDTFlash Flood WarningPHILehigh93 min
Jun 1, 2:36 PM EDTSevere Thunderstorm WarningPHIMonroe54 min
Jun 1, 3:37 PM EDTSevere Thunderstorm WarningPHIMonroe38 min
Jun 1, 4:24 PM EDTSevere Thunderstorm WarningPHIMonroe66 min
Jun 1, 4:31 PM EDTFlash Flood WarningPHIMonroe3 hr
Jun 1, 5:33 PM EDTSevere Thunderstorm WarningPHIBerks87 min
Jun 1, 6:00 PM EDTFlash Flood WarningPHIBerks3 hr
Jun 1, 6:39 PM EDTSevere Thunderstorm WarningPHILehigh58 min
Jun 1, 6:50 PM EDTSevere Thunderstorm WarningPHIBerks62 min
Jun 1, 7:02 PM EDTSevere Thunderstorm WarningPHIBucks88 min
Jun 1, 7:03 PM EDTFlash Flood WarningPHILehigh3 hr

Nearby

Severe Thunderstorm Warnings in Pennsylvania, 2007Every severe thunderstorm warning in 2007

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.