Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 51, NWS Philadelphia/Mount Holly

May 19, 20114 counties in Pennsylvania

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at May 19, 2011, 3:12 PM EDT for 4 counties in Pennsylvania. It was in force for 63 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
May 19, 2011, 3:12 PM EDT (19:12 UTC)
Expired
May 19, 2011, 4:15 PM EDT
In force
63 min
Issued by
NWS Philadelphia/Mount Holly
Area
Storm-based polygon

Counties Carbon County, PA, Lehigh County, PA, Monroe County, PA, Northampton County, PA

The radar

The Philadelphia radar (KDIX), 133 km from the middle of the area, began a volume at 19:13 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 19, 3:14 PM EDTHAIL 0.5Breinigsville, PA
May 19, 3:20 PM EDTHAIL 0.25Fogelsville, PA

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

The watch it was issued in

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

IssuedProductOfficeLasted
May 19, 12:20 PM EDTSevere Thunderstorm WatchSPC8 hr

The nearest sounding before it

Phillips Aaf/Abe, MD (KAPG), launched 12:00Z, 7.2 hours before the alert went out and 152 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 2011-05-19Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 143 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 2011-05-19The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -13 square meters per square second.19395878Sfc1 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
143 J/kg
Mixed-layer CIN
-55 J/kg
Mixed-layer LCL
819 m above ground
0-6 km bulk shear
33 kt
0-1 km storm-relative helicity
-13 m²/s²
0-3 km storm-relative helicity
53 m²/s²
Significant tornado parameter
-0.0
Supercell composite
-0.1

Open this sounding in Storm Lab

The text

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

845 
WUUS51 KPHI 191912
SVRPHI
PAC025-077-089-095-192015-
/O.NEW.KPHI.SV.W.0051.110519T1912Z-110519T2015Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
312 PM EDT THU MAY 19 2011

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  CENTRAL LEHIGH COUNTY IN EASTERN PENNSYLVANIA...
  WESTERN NORTHAMPTON COUNTY IN EASTERN PENNSYLVANIA...
  SOUTHEASTERN CARBON COUNTY IN NORTHEAST PENNSYLVANIA...
  SOUTH CENTRAL MONROE COUNTY IN NORTHEAST PENNSYLVANIA...

* UNTIL 415 PM EDT

* AT 309 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE HAIL.  THIS
  STORM WAS LOCATED NEAR CLAUSSVILLE...OR 11 MILES WEST OF
  ALLENTOWN...AND MOVING NORTHEAST AT 25 MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  SCHNECKSVILLE AND COFFEETOWN AROUND 330 PM EDT...
  NEFFS AROUND 335 PM EDT...
  WALNUTPORT...SLATINGTON...EMERALD AND NORTHAMPTON AROUND 340 PM
  EDT...
  WALNUTPORT AROUND 345 PM EDT...
  BEERSVILLE AND PALMERTON AROUND 350 PM EDT...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THIS STORM HAS A HISTORY OF PRODUCING DESTRUCTIVE WINDS AND LARGE
DAMAGING HAIL. SEEK SHELTER NOW INSIDE A STURDY STRUCTURE AND STAY
AWAY FROM WINDOWS!

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 800 PM EDT
THURSDAY EVENING FOR NEW JERSEY AND EASTERN PENNSYLVANIA.

&&

LAT...LON 4092 7563 4089 7541 4075 7526 4052 7561
      4061 7579
TIME...MOT...LOC 1912Z 215DEG 20KT 4060 7569

$$

HEAVENER
2 follow-up statements
280 
WWUS51 KPHI 191929
SVSPHI

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
329 PM EDT THU MAY 19 2011

PAC025-077-089-095-192015-
/O.CON.KPHI.SV.W.0051.000000T0000Z-110519T2015Z/
LEHIGH PA-NORTHAMPTON PA-CARBON PA-MONROE PA-
329 PM EDT THU MAY 19 2011

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 415 PM EDT
FOR SOUTHWESTERN MONROE...SOUTHEASTERN CARBON...WEST CENTRAL
NORTHAMPTON AND NORTHERN LEHIGH COUNTIES...

AT 326 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE
HAIL.  THIS STORM WAS LOCATED NEAR SCHNECKSVILLE...OR 9 MILES
NORTHWEST OF ALLENTOWN...MOVING NORTHEAST AT 25 MPH.

THE SEVERE THUNDERSTORM WILL BE NEAR...
  WALNUTPORT...SLATINGTON...EMERALD AND NORTHAMPTON BY 340 PM EDT...
  PALMERTON...7 MILES SOUTHEAST OF BOWMANSTOWN AND 8 MILES SOUTHEAST
  OF PARRYVILLE BY 345 PM EDT...
  BEERSVILLE BY 350 PM EDT...
  6 MILES NORTHWEST OF CHAPMAN AND 7 MILES SOUTHEAST OF BELTZVILLE
  STATE PARK BY 400 PM EDT...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THIS STORM HAS A HISTORY OF PRODUCING LARGE DAMAGING HAIL. SEEK 
SHELTER NOW INSIDE A STURDY STRUCTURE AND STAY AWAY FROM WINDOWS!

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 800 PM EDT
THURSDAY EVENING FOR NEW JERSEY AND EASTERN PENNSYLVANIA.

&&

LAT...LON 4089 7546 4078 7535 4060 7559 4065 7577
      4092 7563
TIME...MOT...LOC 1929Z 215DEG 20KT 4068 7562

$$

HEAVENER
516 
WWUS51 KPHI 191951
SVSPHI

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
351 PM EDT THU MAY 19 2011

PAC025-077-089-095-192015-
/O.CON.KPHI.SV.W.0051.000000T0000Z-110519T2015Z/
LEHIGH PA-NORTHAMPTON PA-CARBON PA-MONROE PA-
351 PM EDT THU MAY 19 2011

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 415 PM EDT
FOR SOUTHWESTERN MONROE...SOUTHEASTERN CARBON...WEST CENTRAL
NORTHAMPTON AND NORTH CENTRAL LEHIGH COUNTIES...

AT 347 PM EDT...A SEVERE THUNDERSTORM WAS REPORTED CAPABLE OF
PRODUCING QUARTER SIZE HAIL.  THIS STORM WAS LOCATED NEAR
WALNUTPORT...OR 10 MILES SOUTHEAST OF LEHIGHTON...MOVING NORTHEAST AT
25 MPH.

THE SEVERE THUNDERSTORM WILL BE NEAR...
  6 MILES NORTHWEST OF CHAPMAN AND 7 MILES SOUTHEAST OF BELTZVILLE
  STATE PARK BY 400 PM EDT...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 800 PM EDT
THURSDAY EVENING FOR NEW JERSEY AND EASTERN PENNSYLVANIA.

&&

LAT...LON 4077 7570 4092 7563 4089 7546 4078 7535
      4068 7549
TIME...MOT...LOC 1951Z 215DEG 20KT 4078 7553

$$

HEAVENER

The office that day

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

IssuedProductOfficeCountiesLasted
May 19, 12:31 PM EDTSpecial Weather StatementPHIBerks89 min
May 19, 1:26 PM EDTAreal Flood AdvisoryPHIBerks5 hr
May 19, 1:29 PM EDTSevere Thunderstorm WarningPHIBerks61 min
May 19, 2:22 PM EDTSevere Thunderstorm WarningPHIBerks41 min
May 19, 2:54 PM EDTAreal Flood AdvisoryPHIBerks, Carbon, Lehigh, Northampton3 hr
May 19, 3:00 PM EDTSpecial Weather StatementPHICarbon60 min
May 19, 3:01 PM EDTAreal Flood AdvisoryPHIChester, Delaware, Montgomery, Philadelphia3 hr
May 19, 3:05 PM EDTSpecial Weather StatementPHILehigh, Northampton55 min
May 19, 3:15 PM EDTSpecial Weather StatementPHIChester, Delaware, Montgomery, Philadelphia60 min
May 19, 3:37 PM EDTSevere Thunderstorm WarningPHIMonroe, Northampton53 min
May 19, 3:40 PM EDTAreal Flood AdvisoryPHIBucks, Lehigh, Monroe, Northampton5 hr
May 19, 3:52 PM EDTCoastal Flood StatementPHIDelaware, Philadelphia8 hr
May 19, 4:06 PM EDTSevere Thunderstorm WarningPHIPhiladelphia54 min
May 19, 4:18 PM EDTSpecial Weather StatementPHIMonroe57 min
May 19, 4:20 PM EDTSevere Thunderstorm WarningPHIBucks, Northampton55 min
May 19, 4:28 PM EDTSpecial Weather StatementPHIBucks62 min
May 19, 4:31 PM EDTSpecial Weather StatementPHIBucks59 min
May 19, 4:39 PM EDTFlash Flood WarningPHIBucks, Monroe, Northampton4 hr
May 19, 4:50 PM EDTSpecial Weather StatementPHIMonroe55 min
May 19, 5:08 PM EDTSevere Thunderstorm WarningPHIMonroe, Northampton50 min
May 19, 7:23 PM EDTAreal Flood WarningPHIMontgomery, Philadelphia82 min
May 19, 7:50 PM EDTSpecial Weather StatementPHIPhiladelphia55 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.