Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2007

Severe Thunderstorm Warning 43, NWS Philadelphia/Mount Holly

June 1, 2007Lehigh County, Pennsylvania

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Jun 1, 2007, 6:39 PM EDT for Lehigh County, Pennsylvania. It was in force for 58 min. 2 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
Jun 1, 2007, 6:39 PM EDT (22:39 UTC)
Expired
Jun 1, 2007, 7:37 PM EDT
In force
58 min
Issued by
NWS Philadelphia/Mount Holly
Area
Counties, with a storm outline in the text

County Lehigh County, PA

The radar

The Philadelphia radar (KDIX), 114 km from the middle of the area, began a volume at 22:40 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 1, 6:45 PM EDTTSTM WND DMG5 Se Allentown, PATREES DOWN IN UPPER SAUCON TOWNSHIP
Jun 1, 6:55 PM EDTTSTM WND DMG4 Nnw Ancient Oaks, PATREES DOWN IN UPPER MACUNGIE TOWNSHIP

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Phillips Aaf/Abe, MD (KAPG), launched 12:00Z, 10.7 hours before the alert went out and 134 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°0°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 012239
SVRPHI
PAC077-020015-
/O.NEW.KPHI.SV.W.0043.070601T2239Z-070602T0015Z/

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

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  SOUTHERN LEHIGH COUNTY IN EASTERN PENNSYLVANIA...
  THIS INCLUDES THE CITY OF ALLENTOWN...

* UNTIL 815 PM EDT

* AT 635 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING NICKEL SIZE HAIL...AND
  DAMAGING WINDS IN EXCESS OF 60 MPH.  THIS STORM WAS LOCATED 10
  MILES WEST OF ANCIENT OAKS...OR ABOUT 15 MILES NORTHEAST OF
  READING...AND MOVING EAST AT 15 MPH. IN ADDITION ANOTHER NEAR
  SEVERE THUNDERSTORM WAS IN EXTREME SOUTHEAST LEHIGH COUNTY.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  ANCIENT OAKS BY 705 PM EDT...
  EMMAUS BY 720 PM EDT...
  ALLENTOWN BY 725 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.

THUNDERSTORMS ARE CAPABLE OF PRODUCING HEAVY RAINFALL WHICH MAY
RESULT IN LOCALIZED AREAS OF FLOODING. DO NOT DRIVE IN AREAS WHERE
WATER IS CROSSING THE ROAD.

IN ADDITION TO LARGE HAIL AND DAMAGING WINDS...CONTINUOUS CLOUD TO
GROUND LIGHTNING IS OCCURRING WITH THIS STORM. MOVE INDOORS
IMMEDIATELY LIGHTNING IS ONE OF NATURES NUMBER ONE KILLERS.
REMEMBER...IF YOU CAN HEAR THUNDER...YOU ARE CLOSE ENOUGH TO BE
STRUCK BY LIGHTNING.

LAT...LON 4065 7543 4063 7541 4059 7541 4058 7541
      4056 7540 4051 7539 4050 7541 4051 7563
      4058 7573

$$
 
TFG
2 follow-up statements
000 
WWUS51 KPHI 012257
SVSPHI

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

PAC077-020015-
/O.CON.KPHI.SV.W.0043.000000T0000Z-070602T0015Z/
LEHIGH PA-
651 PM EDT FRI JUN 1 2007

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 815 PM EDT
FOR SOUTHERN LEHIGH COUNTY...

AT 644 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 8 MILES WEST OF ANCIENT OAKS...OR ABOUT 14 MILES WEST OF 
ALLENTOWN...MOVING EAST AT 15 MPH. IN ADDITION TO THIS 
STORM...ANOTHER SEVERE STORM IS INDICATED NEAR EMMAUS AND UPPER 
SAUCON TOWNSHIPS IN THE SOUTHEASTERN PORTION OF THE COUNTY. 

THE SEVERE THUNDERSTORM WILL BE NEAR...
  ANCIENT OAKS BY 710 PM EDT...
  MACUNGIE BY 715 PM EDT...
  EMMAUS BY 725 PM EDT...
  ALLENTOWN AND FULLERTON BY 730 PM EDT...
  COOPERSBURG BY 740 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.

THUNDERSTORMS ARE CAPABLE OF PRODUCING HEAVY RAINFALL WHICH MAY
RESULT IN LOCALIZED AREAS OF FLOODING. DO NOT DRIVE IN AREAS WHERE
WATER IS CROSSING THE ROAD.

IN ADDITION TO LARGE HAIL AND DAMAGING WINDS...CONTINUOUS CLOUD TO
GROUND LIGHTNING IS OCCURRING WITH THIS STORM. MOVE INDOORS
IMMEDIATELY LIGHTNING IS ONE OF NATURES NUMBER ONE KILLERS.
REMEMBER...IF YOU CAN HEAR THUNDER...YOU ARE CLOSE ENOUGH TO BE
STRUCK BY LIGHTNING.

LAT...LON 4065 7543 4063 7541 4059 7541 4058 7541
      4056 7540 4049 7538 4051 7563 4058 7573

$$

ROBERTSON
000 
WWUS51 KPHI 012337
SVSPHI

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

PAC077-012346-
/O.CAN.KPHI.SV.W.0043.000000T0000Z-070602T0015Z/
LEHIGH PA-
736 PM EDT FRI JUN 1 2007

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHERN LEHIGH COUNTY IS
CANCELLED...

THE SEVERE THUNDERSTORM HAS MOVED SOUTH OF THE COUNTY. 


LAT...LON 4065 7543 4063 7541 4059 7541 4058 7541
      4056 7540 4049 7538 4051 7563 4058 7573

$$
 
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, 3:53 PM EDTSevere Thunderstorm WarningPHINorthampton82 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, 6:50 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.