Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2010

Severe Thunderstorm Warning 17, NWS Philadelphia/Mount Holly

May 14, 2010Bucks County, Lehigh County, Northampton County, Pennsylvania

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at May 14, 2010, 5:04 PM EDT for Bucks County, Lehigh County, Northampton County, Pennsylvania. It was in force for 56 min. 10 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 14, 2010, 5:04 PM EDT (21:04 UTC)
Expired
May 14, 2010, 6:00 PM EDT
In force
56 min
Issued by
NWS Philadelphia/Mount Holly
Area
Storm-based polygon

Counties Bucks County, PA, Lehigh County, PA, Northampton County, PA

The radar

The Philadelphia radar (KDIX), 133 km from the middle of the area, began a volume at 21:03 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 14, 5:20 PM EDTHAIL 2.5New Tripoli, PA
May 14, 5:35 PM EDTHAIL 2.52 Se Claussville, PA2.5 INCH HAIL FELL IN UPPER MACUNGIE TOWNSHIP.
May 14, 5:45 PM EDTHAIL 1.25Schnecksville, PAHALF DOLLAR SIZE HAIL FELL IN SCHNECKSVILLE.
May 14, 5:46 PM EDTHAIL 1.75Allentown, PAGOLF BALL SIZE HAIL IN WEST ALLENTOWN.
May 14, 5:50 PM EDTHAIL 1Allentown, PAQUARTER SIZE HAIL IN ALLENTOWN
May 14, 5:50 PM EDTHAIL 1.758 W Allentown, PAGOLF BALL SIZE HAIL IN FOGELSVILLE.
May 14, 5:50 PM EDTHAIL 2.53 Se Claussville, PADAMAGE TO VEHICLES, SOME WINDOWS DAMAGED.
May 14, 5:55 PM EDTTSTM WND GST 60Allentown, PAA FEW TREES DOWN
May 14, 5:55 PM EDTHAIL 1.75Allentown, PAHAIL AS LARGE AS GOLF BALLS IN THE ALLENTOWN AREA, ALSO A FEW TREES DOWN IN LEHIGH COUNTY.
May 14, 5:57 PM EDTFUNNEL CLOUDEmmaus, PAA COUPLE OF FUNNEL CLOUD SIGHTINGS IN LEHIGH COUNTY

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 14, 3:43 PM EDTSevere Thunderstorm WatchSPC6 hr

The nearest sounding before it

Phillips Aaf/Abe, MD (KAPG), launched 12:00Z, 9.1 hours before the alert went out and 138 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 2010-05-14Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1 joules per kilogram.LCLEL10008507005003002001001 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 2010-05-14The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 160 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
1 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
557 m above ground
0-6 km bulk shear
50 kt
0-1 km storm-relative helicity
160 m²/s²
0-3 km storm-relative helicity
187 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.

035 
WUUS51 KPHI 142104
SVRPHI
PAC017-077-095-142200-
/O.NEW.KPHI.SV.W.0017.100514T2104Z-100514T2200Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
504 PM EDT FRI MAY 14 2010

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  LEHIGH COUNTY IN EASTERN PENNSYLVANIA...
  THIS INCLUDES THE CITY OF ALLENTOWN...
  SOUTHWESTERN NORTHAMPTON COUNTY IN EASTERN PENNSYLVANIA...
  NORTHWESTERN BUCKS COUNTY IN SOUTHEAST PENNSYLVANIA...

* UNTIL 600 PM EDT

* AT 459 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 9 MILES
  WEST OF WANAMAKERS...OR 17 MILES SOUTHWEST OF LEHIGHTON...AND
  MOVING EAST AT 40 MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  WANAMAKERS AROUND 515 PM EDT...
  NEW TRIPOLI AND JORDAN VALLEY AROUND 520 PM EDT...
  CLAUSSVILLE...SCHNECKSVILLE AND NEFFS AROUND 530 PM EDT...
  COFFEETOWN AROUND 535 PM EDT...
  NORTHAMPTON AROUND 540 PM EDT...
  ALLENTOWN AND EMMAUS AROUND 545 PM EDT...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 1000 PM EDT
FRIDAY EVENING FOR DELAWARE AND NORTHEASTERN MARYLAND AND NEW JERSEY
AND EASTERN PENNSYLVANIA.

&&

LAT...LON 4068 7590 4074 7578 4075 7575 4077 7572
      4070 7524 4047 7530 4055 7571
TIME...MOT...LOC 2104Z 284DEG 33KT 4070 7595

$$

HAYES
1 follow-up statement
515 
WWUS51 KPHI 142125
SVSPHI

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
525 PM EDT FRI MAY 14 2010

PAC017-077-095-142200-
/O.CON.KPHI.SV.W.0017.000000T0000Z-100514T2200Z/
LEHIGH PA-NORTHAMPTON PA-BUCKS PA-
525 PM EDT FRI MAY 14 2010

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 600 PM EDT
FOR NORTHWESTERN BUCKS...SOUTHERN NORTHAMPTON AND LEHIGH COUNTIES...

AT 520 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE
HAIL...AND DAMAGING WINDS IN EXCESS OF 60 MPH.  THIS STORM WAS
LOCATED NEAR NEW TRIPOLI...OR 12 MILES SOUTH OF LEHIGHTON...MOVING
EAST AT 40 MPH.

THE SEVERE THUNDERSTORM WILL BE NEAR...
  CLAUSSVILLE...SCHNECKSVILLE AND NEFFS BY 530 PM EDT...
  COFFEETOWN BY 535 PM EDT...
  HOKENDAUQUA...COPLAY AND NORTHAMPTON BY 540 PM EDT...
  ALLENTOWN...FULLERTON AND CATASAUQUA BY 545 PM EDT...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 1000 PM EDT
FRIDAY EVENING FOR DELAWARE AND NORTHEASTERN MARYLAND AND NEW JERSEY
AND EASTERN PENNSYLVANIA.

&&

LAT...LON 4068 7590 4074 7578 4075 7575 4077 7572
      4070 7524 4047 7530 4055 7571
TIME...MOT...LOC 2125Z 284DEG 33KT 4065 7570

$$

HAYES

The office that day

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

IssuedProductOfficeCountiesLasted
May 14, 3:52 PM EDTSpecial Weather StatementPHICarbon, Monroe53 min
May 14, 4:18 PM EDTSpecial Weather StatementPHICarbon57 min
May 14, 4:26 PM EDTSpecial Weather StatementPHICarbon, Northampton64 min
May 14, 4:42 PM EDTSevere Thunderstorm WarningPHIBerks63 min
May 14, 5:07 PM EDTSpecial Weather StatementPHINorthampton53 min
May 14, 5:38 PM EDTTornado WarningPHIBerks, Lehigh37 min
May 14, 5:49 PM EDTSevere Thunderstorm WarningPHIBerks, Chester, Montgomery56 min
May 14, 5:53 PM EDTSevere Thunderstorm WarningPHIBerks, Bucks, Lehigh, Northampton67 min
May 14, 6:11 PM EDTSpecial Weather StatementPHICarbon64 min
May 14, 6:25 PM EDTSevere Thunderstorm WarningPHIBucks, Chester, Montgomery, Philadelphia65 min
May 14, 6:35 PM EDTSevere Thunderstorm WarningPHIChester, Delaware55 min

Nearby

Severe Thunderstorm Warnings in Pennsylvania, 2010Every severe thunderstorm warning in 2010

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.