Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 26, NWS Philadelphia/Mount Holly

April 28, 2011Carbon County, Monroe County, Pennsylvania

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Apr 28, 2011, 6:18 AM EDT for Carbon County, Monroe County, Pennsylvania. It was in force for 57 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
Apr 28, 2011, 6:18 AM EDT (10:18 UTC)
Expired
Apr 28, 2011, 7:15 AM EDT
In force
57 min
Issued by
NWS Philadelphia/Mount Holly
Area
Storm-based polygon

Counties Carbon County, PA, Monroe County, PA

The radar

The Binghamton radar (KBGM), 132 km from the middle of the area, began a volume at 10:21 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 watch it was issued in

The SPC watch in force over the same counties when this warning went out.

IssuedProductOfficeLasted
Apr 28, 4:05 AM EDTSevere Thunderstorm WatchSPC6 hr

The nearest sounding before it

Brookhaven, NY (KOKX), launched 00:00Z, 10.3 hours before the alert went out and 221 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 00:00Z on 2011-04-28Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 172 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, Brookhaven, NY at 00:00Z on 2011-04-28The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 207 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
172 J/kg
Mixed-layer CIN
-34 J/kg
Mixed-layer LCL
447 m above ground
0-6 km bulk shear
32 kt
0-1 km storm-relative helicity
207 m²/s²
0-3 km storm-relative helicity
246 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.

697 
WUUS51 KPHI 281018
SVRPHI
PAC025-089-281115-
/O.NEW.KPHI.SV.W.0026.110428T1018Z-110428T1115Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
618 AM EDT THU APR 28 2011

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  CARBON COUNTY IN NORTHEAST PENNSYLVANIA...
  THIS INCLUDES THE CITY OF LEHIGHTON...
  MONROE COUNTY IN NORTHEAST PENNSYLVANIA...
  THIS INCLUDES THE CITY OF MOUNT POCONO...

* UNTIL 715 AM EDT

* AT 614 AM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING DAMAGING WINDS IN
  EXCESS OF 60 MPH.  THESE STORMS WERE LOCATED ALONG A LINE EXTENDING
  FROM 22 MILES SOUTHWEST OF WILKES-BARRE TO 8 MILES SOUTHWEST OF 
  LEHIGHTON...AND MOVING NORTHEAST AT 45 MPH.

* SEVERE THUNDERSTORMS WILL BE NEAR...
  PALMERTON...BELTZVILLE STATE PARK AND WHITE HAVEN AROUND 625 AM
  EDT...
  PENN FOREST RESERVOIR AND CHRISTMANS AROUND 630 AM EDT...
  ROSSLAND...GILBERT...BRODHEADSVILLE AND MECKESVILLE AROUND 635 AM
  EDT...
  SAYLORSBURG AROUND 640 AM EDT...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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 4116 7516 4115 7509 4108 7502 4103 7505
      4089 7529 4074 7578 4091 7600 4098 7586
      4100 7575 4105 7578 4110 7577 4114 7570
      4113 7564 4121 7557 4125 7550 4126 7514
TIME...MOT...LOC 1018Z 223DEG 55KT 4107 7611 4098 7588
          4080 7578

$$

HAYES
2 follow-up statements
690 
WWUS51 KPHI 281037
SVSPHI

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
637 AM EDT THU APR 28 2011

PAC025-089-281115-
/O.CON.KPHI.SV.W.0026.000000T0000Z-110428T1115Z/
CARBON PA-MONROE PA-
637 AM EDT THU APR 28 2011

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 715 AM EDT
FOR MONROE AND CARBON COUNTIES...

AT 635 AM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING DAMAGING
WINDS IN EXCESS OF 60 MPH.  THESE STORMS WERE LOCATED ALONG A LINE
EXTENDING FROM 14 MILES NORTH OF EAST SIDE TO BLAKESLEE TO JIM
THORPE...OR ALONG A LINE EXTENDING FROM WILKES-BARRE TO 14 MILES WEST
OF MOUNT POCONO TO 6 MILES NORTH OF LEHIGHTON...MOVING NORTHEAST AT
45 MPH.

SEVERE THUNDERSTORMS WILL BE NEAR...
  SAYLORSBURG...ROSSLAND...GILBERT AND BRODHEADSVILLE BY 645 AM
  EDT...
  STORMVILLE...REEDERS...POCONO RACEWAY AND LONG POND BY 650 AM
  EDT...
  SCOTRUN AND ANALOMINK BY 655 AM EDT...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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 4116 7516 4115 7509 4108 7502 4103 7505
      4089 7529 4074 7578 4091 7600 4098 7586
      4100 7575 4105 7578 4110 7577 4114 7570
      4113 7564 4121 7557 4125 7550 4126 7514
TIME...MOT...LOC 1037Z 223DEG 55KT 4127 7583 4118 7560
          4093 7566

$$

HAYES
007 
WWUS51 KPHI 281115
SVSPHI

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
715 AM EDT THU APR 28 2011

PAC025-089-281124-
/O.EXP.KPHI.SV.W.0026.000000T0000Z-110428T1115Z/
CARBON PA-MONROE PA-
715 AM EDT THU APR 28 2011

...THE SEVERE THUNDERSTORM WARNING FOR MONROE AND CARBON COUNTIES
WILL EXPIRE AT 715 AM EDT...

THE THUNDERSTORMS HAVE WEAKENED BUT HAVE TRANSITIONED MORE INTO A 
HEAVY RAIN THREAT.

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 1000 AM EDT
THURSDAY MORNING FOR DELAWARE AND NORTHEASTERN MARYLAND AND WESTERN
NEW JERSEY AND EASTERN PENNSYLVANIA.

LAT...LON 4116 7516 4115 7509 4108 7502 4103 7505
      4089 7529 4074 7578 4091 7600 4098 7586
      4100 7575 4105 7578 4110 7577 4114 7570
      4113 7564 4121 7557 4125 7550 4126 7514
TIME...MOT...LOC 1114Z 223DEG 55KT 4168 7531 4159 7508
          4134 7515

$$

GORSE

The office that day

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

IssuedProductOfficeCountiesLasted
Apr 28, 4:24 AM EDTSpecial Weather StatementPHIBerks, Carbon, Lehigh, Northampton66 min
Apr 28, 4:36 AM EDTSevere Thunderstorm WarningPHIBerks, Carbon, Lehigh, Monroe, Northampton54 min
Apr 28, 5:31 AM EDTSpecial Weather StatementPHICarbon, Monroe59 min
Apr 28, 5:49 AM EDTSpecial Weather StatementPHICarbon56 min
Apr 28, 5:58 AM EDTAreal Flood AdvisoryPHIBerks, Carbon, Lehigh, Monroe, Northampton3 hr
Apr 28, 6:12 AM EDTSpecial Weather StatementPHIChester, Delaware, Philadelphia63 min
Apr 28, 6:23 AM EDTSpecial Weather StatementPHIBerks, Chester, Lehigh, Montgomery52 min
Apr 28, 6:56 AM EDTSevere Thunderstorm WarningPHIBerks, Bucks, Chester, Delaware, Lehigh, Montgomery and 2 more34 min
Apr 28, 7:06 AM EDTFlash Flood WarningPHICarbon, Monroe6 hr
Apr 28, 7:35 AM EDTSpecial Weather StatementPHIBucks55 min
Apr 28, 8:17 AM EDTSpecial Weather StatementPHIBerks58 min
Apr 28, 8:55 AM EDTSevere Thunderstorm WarningPHIBerks, Lehigh65 min
Apr 28, 8:59 AM EDTAreal Flood AdvisoryPHIBerks, Lehigh4 hr
Apr 28, 9:11 AM EDTSpecial Weather StatementPHICarbon, Monroe49 min
Apr 28, 9:33 AM EDTSevere Thunderstorm WarningPHICarbon, Lehigh, Monroe, Northampton57 min
Apr 28, 10:00 AM EDTSevere Thunderstorm WarningPHIBerks, Bucks, Chester, Lehigh, Montgomery60 min
Apr 28, 10:25 AM EDTSevere Thunderstorm WarningPHIBucks, Carbon, Lehigh, Monroe, Northampton50 min
Apr 28, 10:48 AM EDTAreal Flood AdvisoryPHIBucks, Chester, Montgomery, Northampton3 hr
Apr 28, 10:57 AM EDTSevere Thunderstorm WarningPHIBerks, Bucks, Chester, Lehigh, Montgomery, Northampton63 min
Apr 28, 10:58 AM EDTTornado WarningPHIBucks, Northampton32 min
Apr 28, 11:11 AM EDTSevere Thunderstorm WarningPHINorthampton64 min
Apr 28, 12:03 PM EDTSpecial Weather StatementPHIMontgomery, Philadelphia57 min
Apr 28, 12:11 PM EDTSevere Thunderstorm WarningPHIBucks, Chester, Delaware, Montgomery31 min
Apr 28, 12:42 PM EDTSpecial Weather StatementPHIDelaware63 min
Apr 28, 12:45 PM EDTSpecial Weather StatementPHIBucks, Delaware, Montgomery, Philadelphia60 min
Apr 28, 1:23 PM EDTAreal Flood AdvisoryPHIPhiladelphia103 min

Nearby

Severe Thunderstorm Warnings in Pennsylvania, 2011Every severe thunderstorm warning in 2011

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.