Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 43, NWS Philadelphia/Mount Holly

May 15, 2011Lehigh County, Monroe County, Northampton County, Pennsylvania

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at May 15, 2011, 5:03 PM EDT for Lehigh County, Monroe County, Northampton 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
May 15, 2011, 5:03 PM EDT (21:03 UTC)
Expired
May 15, 2011, 6:00 PM EDT
In force
57 min
Issued by
NWS Philadelphia/Mount Holly
Area
Storm-based polygon

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

The radar

The Philadelphia radar (KDIX), 127 km from the middle of the area, began a volume at 21:05 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

Brookhaven, NY (KOKX), launched 12:00Z, 9.1 hours before the alert went out and 216 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 2011-05-15Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 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 2011-05-15The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 143 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
504 m above ground
0-6 km bulk shear
30 kt
0-1 km storm-relative helicity
143 m²/s²
0-3 km storm-relative helicity
236 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.

763 
WUUS51 KPHI 152103
SVRPHI
PAC077-089-095-152200-
/O.NEW.KPHI.SV.W.0043.110515T2103Z-110515T2200Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
503 PM EDT SUN MAY 15 2011

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A

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

* UNTIL 600 PM EDT

* AT 501 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE HAIL.  THIS
  STORM WAS LOCATED NEAR NORTHAMPTON...OR 8 MILES NORTHWEST OF
  ALLENTOWN...AND MOVING NORTHEAST AT 20 MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  BEERSVILLE AROUND 515 PM EDT...
  BATH AROUND 525 PM EDT...
  NAZARETH AROUND 535 PM EDT...
  ROSSLAND AROUND 540 PM EDT...
  BELFAST AROUND 545 PM EDT...
  WIND GAP AROUND 550 PM 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 4076 7559 4097 7523 4083 7510 4063 7548
      4073 7561
TIME...MOT...LOC 2104Z 231DEG 18KT 4070 7553

$$

HAYES
3 follow-up statements
297 
WWUS51 KPHI 152125
SVSPHI

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
525 PM EDT SUN MAY 15 2011

PAC077-089-095-152200-
/O.CON.KPHI.SV.W.0043.000000T0000Z-110515T2200Z/
LEHIGH PA-NORTHAMPTON PA-MONROE PA-
525 PM EDT SUN MAY 15 2011

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 600 PM EDT
FOR SOUTH CENTRAL MONROE...NORTHAMPTON AND NORTH CENTRAL LEHIGH
COUNTIES...

AT 522 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE
HAIL.  THIS STORM WAS LOCATED NEAR CHAPMAN...OR 11 MILES WEST OF
EASTON...MOVING NORTHEAST AT 20 MPH.

THE SEVERE THUNDERSTORM WILL BE NEAR...
  EASTLAWN GARDENS BY 535 PM EDT...
  BELFAST AND STOCKERTOWN BY 540 PM EDT...
  WIND GAP BY 545 PM EDT...
  6 MILES SOUTHEAST OF SAYLORSBURG BY 550 PM EDT...
  BANGOR...ROSETO AND PEN ARGYL BY 555 PM EDT...
  EAST BANGOR BY 600 PM EDT...

LAT...LON 4076 7559 4097 7523 4083 7510 4063 7548
      4073 7561
TIME...MOT...LOC 2126Z 234DEG 18KT 4076 7538

$$

HAYES
555 
WWUS51 KPHI 152135
SVSPHI

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
535 PM EDT SUN MAY 15 2011

PAC077-152145-
/O.CAN.KPHI.SV.W.0043.000000T0000Z-110515T2200Z/
LEHIGH PA-
535 PM EDT SUN MAY 15 2011

...THE SEVERE THUNDERSTORM WARNING FOR NORTH CENTRAL LEHIGH COUNTY IS
CANCELLED...

THE STORM THAT PROMPTED THE WARNING HAS EXITED THE AREA.

LAT...LON 4080 7550 4076 7559 4097 7523 4083 7510
      4069 7537
TIME...MOT...LOC 2135Z 234DEG 18KT 4078 7533

$$

PAC089-095-152200-
/O.CON.KPHI.SV.W.0043.000000T0000Z-110515T2200Z/
NORTHAMPTON PA-MONROE PA-
535 PM EDT SUN MAY 15 2011

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 600 PM EDT
FOR SOUTH CENTRAL MONROE AND NORTHERN NORTHAMPTON COUNTIES...

AT 530 PM EDT...A SEVERE THUNDERSTORM WAS REPORTED CAPABLE OF
PRODUCING QUARTER SIZE HAIL.  THIS STORM WAS LOCATED NEAR CHAPMAN...
OR 9 MILES NORTHWEST OF EASTON...MOVING NORTHEAST AT 20 MPH.

THE SEVERE THUNDERSTORM WILL BE NEAR...
  BELFAST AND STOCKERTOWN BY 540 PM EDT...
  WIND GAP BY 545 PM EDT...
  6 MILES SOUTHEAST OF SAYLORSBURG BY 550 PM EDT...
  PEN ARGYL BY 555 PM EDT...
  BANGOR...EAST BANGOR...ROSETO AND 7 MILES SOUTH OF STORMVILLE BY
  600 PM EDT...

LAT...LON 4080 7550 4076 7559 4097 7523 4083 7510
      4069 7537
TIME...MOT...LOC 2135Z 234DEG 18KT 4078 7533

$$

HAYES
246 
WWUS51 KPHI 152152
SVSPHI

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
552 PM EDT SUN MAY 15 2011

PAC089-095-152202-
/O.EXP.KPHI.SV.W.0043.000000T0000Z-110515T2200Z/
NORTHAMPTON PA-MONROE PA-
552 PM EDT SUN MAY 15 2011

...THE SEVERE THUNDERSTORM WARNING FOR SOUTH CENTRAL MONROE AND
NORTHERN NORTHAMPTON COUNTIES WILL EXPIRE AT 600 PM EDT...

THE STORM IS WEAKENING AND ABOUT TO MOVE OUT OF THE AREA.

LAT...LON 4080 7550 4076 7559 4097 7523 4083 7510
      4069 7537
TIME...MOT...LOC 2152Z 234DEG 18KT 4083 7524

$$

HAYES

The office that day

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

IssuedProductOfficeCountiesLasted
May 14, 11:46 PM EDTSpecial Weather StatementPHIBerks, Chester, Delaware, Montgomery89 min
May 15, 12:52 AM EDTSpecial Weather StatementPHIBucks, Carbon, Lehigh, Monroe, Montgomery, Northampton and 1 more83 min
May 15, 2:26 PM EDTSpecial Weather StatementPHIBerks64 min
May 15, 2:46 PM EDTSpecial Weather StatementPHISchuylkill59 min
May 15, 2:55 PM EDTSpecial Weather StatementPHIDelaware65 min
May 15, 3:30 PM EDTSpecial Weather StatementPHIBerks60 min
May 15, 3:37 PM EDTSevere Thunderstorm WarningPHIBucks53 min
May 15, 3:39 PM EDTSevere Thunderstorm WarningPHIBerks, Lehigh44 min
May 15, 4:14 PM EDTSpecial Weather StatementPHILehigh61 min
May 15, 4:19 PM EDTSevere Thunderstorm WarningPHIBerks, Lehigh56 min
May 15, 4:31 PM EDTSpecial Weather StatementPHIDelaware, Philadelphia59 min
May 15, 4:35 PM EDTSpecial Weather StatementPHILehigh55 min
May 15, 4:52 PM EDTSpecial Weather StatementPHINorthampton68 min
May 15, 5:33 PM EDTSpecial Weather StatementPHIBerks, Carbon, Lehigh57 min
May 15, 5:37 PM EDTSpecial Weather StatementPHIBucks53 min
May 15, 5:46 PM EDTSevere Thunderstorm WarningPHIBucks59 min
May 15, 6:39 PM EDTSpecial Weather StatementPHIBerks66 min
May 15, 7:20 PM EDTAreal Flood AdvisoryPHIBerks, Lehigh3 hr
May 15, 7:28 PM EDTSpecial Weather StatementPHIDelaware, Montgomery, Philadelphia62 min
May 15, 7:37 PM EDTSpecial Weather StatementPHIBerks53 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.