Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2014

Severe Thunderstorm Warning 104, NWS Philadelphia/Mount Holly

July 8, 2014Bucks County, Lehigh County, Northampton County, Pennsylvania

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Jul 8, 2014, 8:25 PM EDT for Bucks County, Lehigh County, Northampton County, Pennsylvania. It was in force for 59 min. 9 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: Jul 8, 2014, 8:25 PM EDT (00:25 UTC)
Expired: Jul 8, 2014, 9:24 PM EDT
In force: 59 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), 88 km from the middle of the area, began a volume at 00:28 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

Time	Report	Where	Remark
Jul 8, 8:35 PM EDT	TSTM WND DMG	Coopersburg, PA	NUMEROUS TREES AND WIRES DOWN COUNTYWIDE.
Jul 8, 8:36 PM EDT	TSTM WND DMG	Lehigh Twp, PA	TREES REPORTED DOWN NEAR DANIELSVILLE.
Jul 8, 8:38 PM EDT	TSTM WND GST 47	Allentown Airport, PA
Jul 8, 8:40 PM EDT	TSTM WND GST 56	S Allentown, PA
Jul 8, 8:42 PM EDT	TSTM WND DMG	Buckingham, PA	LARGE OAK TREE DOWN IN RESIDENTS YARD.
Jul 8, 8:42 PM EDT	TSTM WND DMG	Moore Twp, PA	LARGE TREE LIMBS DOWN.
Jul 8, 8:42 PM EDT	TSTM WND DMG	Williams Twp, PA	TREES AND WIRES DOWN ON MORVALE ROAD AND DELAWARE DRIVE.
Jul 8, 8:45 PM EDT	TSTM WND DMG	Bushkill Twp, PA	TREES DOWN ACROSS ROADWAYS.
Jul 8, 8:54 PM EDT	TSTM WND DMG	Levittown, PA	TREES DOWN AND SOME TRANSFORMERS BLOWING.

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.

Issued	Product	Office	Lasted
Jul 8, 5:05 PM EDT	Severe Thunderstorm Watch	SPC	5 hr

The nearest sounding before it

Brookhaven, NY (KOKX), launched 00:00Z, 0.4 hours before the alert went out and 192 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 342 J/kg
Mixed-layer CIN: -179 J/kg
Mixed-layer LCL: 1109 m above ground
0-6 km bulk shear: 34 kt
0-1 km storm-relative helicity: 114 m²/s²
0-3 km storm-relative helicity: 124 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.4

Open this sounding in Storm Lab

The text

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

250 
WUUS51 KPHI 090025
SVRPHI
PAC017-077-095-090215-
/O.NEW.KPHI.SV.W.0104.140709T0025Z-140709T0215Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
825 PM EDT TUE JUL 8 2014

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  BUCKS COUNTY IN SOUTHEAST PENNSYLVANIA...
  LEHIGH COUNTY IN EASTERN PENNSYLVANIA...
  NORTHAMPTON COUNTY IN EASTERN PENNSYLVANIA...

* UNTIL 1015 PM EDT

* AT 822 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM. THE STORM WAS NEAR TRUMBAUERSVILLE...MOVING
  NORTHEAST AT 50 MPH. THIS STORM IS CAPABLE OF PRODUCING GOLF BALL
  SIZE HAIL...AND DAMAGING WINDS IN EXCESS OF 60 MPH. 

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  BEDMINSTER AND DUBLIN AROUND 840 PM EDT...
  TINICUM AND PIPERSVILLE AROUND 845 PM EDT...
  ERWINNA AND LUMBERVILLE AROUND 850 PM EDT...
  WASHINGTON CROSSING AND YARDLEY AROUND 855 PM EDT...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THIS IS A DANGEROUS STORM. OTHER STORMS WILL BE MOVING INTO LEHIGH 
AND NORTHAMPTON COUNTIES. IF YOU ARE IN THE PATH OF THESE STORMS 
MOVE INDOORS TO A STURDY BUILDING AND STAY AWAY FROM WINDOWS. WHEN 
IT IS SAFE TO DO SO...REPORT SEVERE WEATHER TO LOCAL LAW ENFORCEMENT 
OR TO THE NATIONAL WEATHER SERVICE.

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 1100 PM EDT
TUESDAY EVENING FOR DELAWARE AND NORTHEASTERN MARYLAND AND NEW JERSEY
AND EASTERN PENNSYLVANIA. A SEVERE THUNDERSTORM WATCH ALSO REMAINS IN
EFFECT UNTIL MIDNIGHT EDT WEDNESDAY MORNING FOR NORTHEAST NEW JERSEY.

&&

LAT...LON 4086 7505 4085 7509 4078 7513 4075 7520
      4058 7520 4056 7509 4042 7506 4039 7496
      4034 7495 4021 7477 4015 7473 4013 7482
      4008 7487 4005 7497 4012 7497 4068 7589
      4078 7568 4086 7529 4093 7521 4096 7512
TIME...MOT...LOC 0024Z 247DEG 55KT 4038 7533

$$

FORECASTER:JJM

1 follow-up statement

933 
WWUS51 KPHI 090124
SVSPHI

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
924 PM EDT TUE JUL 8 2014

PAC017-077-095-090134-
/O.CAN.KPHI.SV.W.0104.000000T0000Z-140709T0215Z/
BUCKS PA-LEHIGH PA-NORTHAMPTON PA-
924 PM EDT TUE JUL 8 2014

...THE SEVERE THUNDERSTORM WARNING FOR NORTHAMPTON...LEHIGH AND BUCKS
COUNTIES IS CANCELLED...

THE THUNDERSTORMS RESPONSIBLE FOR THE WARNING HAVE EXITED THE 
AREA...SO THE WARNING HAS BEEN CANCELLED.

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 1100 PM EDT
TUESDAY EVENING FOR DELAWARE AND NORTHEASTERN MARYLAND AND NEW JERSEY
AND EASTERN PENNSYLVANIA. A SEVERE THUNDERSTORM WATCH ALSO REMAINS IN
EFFECT UNTIL MIDNIGHT EDT WEDNESDAY MORNING FOR NORTHEAST NEW JERSEY.

LAT...LON 4086 7505 4085 7509 4078 7513 4075 7520
      4058 7520 4056 7509 4042 7506 4039 7496
      4034 7495 4021 7477 4015 7473 4013 7482
      4008 7487 4005 7497 4012 7497 4068 7589
      4078 7568 4086 7529 4093 7521 4096 7512
TIME...MOT...LOC 0124Z 247DEG 55KT 4073 7422

$$

JJM

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 8, 8:06 PM EDT	Severe Thunderstorm Warning	PHI	Delaware, Montgomery, Philadelphia	84 min
Jul 8, 8:38 PM EDT	Severe Thunderstorm Warning	PHI	Berks, Chester	25 min
Jul 9, 2:04 PM EDT	Special Weather Statement	PHI	Lehigh	41 min
Jul 9, 2:40 PM EDT	Special Weather Statement	PHI	Lehigh	65 min
Jul 9, 2:48 PM EDT	Special Weather Statement	PHI	Monroe	72 min
Jul 9, 4:43 PM EDT	Special Weather Statement	PHI	Northampton	62 min
Jul 9, 5:07 PM EDT	Severe Thunderstorm Warning	PHI	Carbon, Monroe, Northampton	53 min
Jul 9, 5:28 PM EDT	Special Weather Statement	PHI	Berks, Lehigh, Northampton	92 min
Jul 9, 5:42 PM EDT	Severe Thunderstorm Warning	PHI	Lehigh, Monroe, Northampton	48 min

Nearby

Severe Thunderstorm Warnings in Pennsylvania, 2014 Every severe thunderstorm warning in 2014

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.