Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2010

Severe Thunderstorm Warning 20, NWS Philadelphia/Mount Holly

May 14, 2010Burlington County, Hunterdon County, Mercer County, New Jersey; 4 counties in Pennsylvania

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at May 14, 2010, 6:25 PM EDT for Burlington County, Hunterdon County, Mercer County, New Jersey; 4 counties in Pennsylvania. It was in force for 65 min. 1 report 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, 6:25 PM EDT (22:25 UTC)
Expired
May 14, 2010, 7:30 PM EDT
In force
65 min
Issued by
NWS Philadelphia/Mount Holly
Area
Storm-based polygon

Counties Burlington County, NJ, Hunterdon County, NJ, Mercer County, NJ, Bucks County, PA, Chester County, PA, Montgomery County, PA, Philadelphia County, PA

The radar

The Philadelphia radar (KDIX), 63 km from the middle of the area, began a volume at 22:25 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, 6:28 PM EDTTSTM WND DMG3 N Fricks, PATREES DOWN ON WIRES IN HILLTOWN TOWNSHIP.

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, 10.4 hours before the alert went out and 128 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°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.

424 
WUUS51 KPHI 142225
SVRPHI
NJC005-019-021-PAC017-029-091-101-142330-
/O.NEW.KPHI.SV.W.0020.100514T2225Z-100514T2330Z/

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

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  WESTERN MERCER COUNTY IN CENTRAL NEW JERSEY...
  THIS INCLUDES THE CITY OF TRENTON...
  SOUTH CENTRAL HUNTERDON COUNTY IN NORTHWEST NEW JERSEY...
  BUCKS COUNTY IN SOUTHEAST PENNSYLVANIA...
  EXTREME NORTHEASTERN CHESTER COUNTY IN SOUTHEAST PENNSYLVANIA...
  MONTGOMERY COUNTY IN SOUTHEAST PENNSYLVANIA...
  NORTHERN PHILADELPHIA COUNTY IN SOUTHEAST PENNSYLVANIA...
  NORTHWESTERN BURLINGTON COUNTY IN SOUTHERN NEW JERSEY...

* UNTIL 730 PM EDT

* AT 621 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE HAIL.  THIS
  STORM WAS LOCATED NEAR GREEN LANE...OR 19 MILES SOUTH OF
  ALLENTOWN...AND MOVING SOUTHEAST AT 35 MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  SOUDERTON AROUND 635 PM EDT...
  LANSDALE...HATFIELD AND FRICKS AROUND 640 PM EDT...
  CHALFONT AROUND 645 PM EDT...
  AMBLER AROUND 650 PM EDT...
  HATBORO...WILLOW GROVE...IVYLAND AND ABINGTON AROUND 700 PM EDT...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

DOPPLER RADAR HAS INDICATED SOME ROTATION WITHIN THIS STORM. WHILE 
NOT IMMEDIATELY LIKELY...A TORNADO MAY STILL DEVELOP. IF A TORNADO 
IS SPOTTED...ACT QUICKLY AND MOVE TO A PLACE OF SAFETY IN A STURDY 
STRUCTURE...SUCH AS A BASEMENT OR SMALL INTERIOR ROOM.

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 1000 PM EDT
FRIDAY EVENING FOR DELAWARE AND NORTHEASTERN MARYLAND AND NEW JERSEY
AND EASTERN PENNSYLVANIA.

&&

LAT...LON 4035 7464 3996 7482 4019 7561 4051 7537
TIME...MOT...LOC 2225Z 296DEG 30KT 4030 7544

$$

HAYES
1 follow-up statement
103 
WWUS51 KPHI 142256
SVSPHI

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

NJC005-019-021-PAC017-029-091-101-142330-
/O.CON.KPHI.SV.W.0020.000000T0000Z-100514T2330Z/
HUNTERDON NJ-MERCER NJ-PHILADELPHIA PA-CHESTER PA-MONTGOMERY PA-
BUCKS PA-BURLINGTON NJ-
656 PM EDT FRI MAY 14 2010

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 730 PM EDT
FOR NORTHWESTERN BURLINGTON...BUCKS...MONTGOMERY...EXTREME
NORTHEASTERN CHESTER...NORTHERN PHILADELPHIA...WESTERN MERCER AND
SOUTH CENTRAL HUNTERDON COUNTIES...

AT 654 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE
HAIL.  THIS STORM WAS LOCATED NEAR HORSHAM...OR 13 MILES NORTH OF
PHILADELPHIA...MOVING SOUTHEAST AT 35 MPH.

THE SEVERE THUNDERSTORM WILL BE NEAR...
  BRYN ATHYN...CHURCHVILLE...RICHBORO AND ROCKLEDGE BY 705 PM EDT...
  FEASTERVILLE...NORTHEAST PHILADELPHIA AND VILLAGE SHIRES BY 710 PM
  EDT...
  BENSALEM...CORNWELLS HEIGHTS-EDDINGTON AND HULMEVILLE BY 715 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 4035 7464 3996 7482 4019 7561 4051 7537
TIME...MOT...LOC 2256Z 296DEG 30KT 4019 7514

$$

HAYES

The office that day

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

IssuedProductOfficeCountiesLasted
May 14, 4:18 PM EDTSpecial Weather StatementPHIWarren57 min
May 14, 5:07 PM EDTSpecial Weather StatementPHIMorris, Warren53 min
May 14, 5:53 PM EDTSevere Thunderstorm WarningPHIHunterdon, Somerset, Warren67 min
May 14, 6:09 PM EDTSpecial Weather StatementPHIMorris66 min
May 14, 6:11 PM EDTSpecial Weather StatementPHIWarren64 min
May 14, 6:58 PM EDTSpecial Weather StatementPHIMercer, Monmouth, Ocean62 min
May 14, 7:04 PM EDTSevere Thunderstorm WarningPHIBurlington, Mercer, Monmouth, Ocean56 min
May 14, 7:19 PM EDTSpecial Marine WarningPHI56 min
May 14, 7:19 PM EDTSevere Thunderstorm WarningPHIAtlantic, Burlington, Camden, Gloucester56 min
May 14, 7:27 PM EDTSevere Thunderstorm WarningPHICumberland, Salem63 min
May 14, 7:33 PM EDTSpecial Marine WarningPHI87 min
May 14, 7:48 PM EDTSevere Thunderstorm WarningPHIBurlington, Ocean57 min
May 14, 3:52 PM EDTSpecial Weather StatementPHICarbon, Monroe53 min
May 14, 4:26 PM EDTSpecial Weather StatementPHICarbon, Northampton64 min
May 14, 4:42 PM EDTSevere Thunderstorm WarningPHIBerks63 min
May 14, 5:04 PM EDTSevere Thunderstorm WarningPHIBucks, Lehigh, Northampton56 min
May 14, 5:38 PM EDTTornado WarningPHIBerks, Lehigh37 min
May 14, 5:49 PM EDTSevere Thunderstorm WarningPHIBerks, Chester, Montgomery56 min
May 14, 6:35 PM EDTSevere Thunderstorm WarningPHIChester, Delaware55 min

Nearby

Severe Thunderstorm Warnings in Pennsylvania, 2010Severe Thunderstorm Warnings in New Jersey, 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.