Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2014

Severe Thunderstorm Warning 102, NWS Philadelphia/Mount Holly

July 8, 2014Delaware County, Montgomery County, Philadelphia County, Pennsylvania

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Jul 8, 2014, 8:06 PM EDT for Delaware County, Montgomery County, Philadelphia County, Pennsylvania. It was in force for 84 min. 7 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, 8:06 PM EDT (00:06 UTC)
Expired: Jul 8, 2014, 9:30 PM EDT
In force: 84 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon

Counties Delaware County, PA, Montgomery County, PA, Philadelphia County, PA

The radar

The Philadelphia radar (KDIX), 87 km from the middle of the area, began a volume at 00:08 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, 8:12 PM EDT	TSTM WND DMG	Chadds Ford, PA	NUMEROUS LARGE TREE LIMBS DOWN.
Jul 8, 8:30 PM EDT	TSTM WND DMG	Upper Darby, PA	TREES DOWN IN PORTIONS OF THE TOWNSHIP.
Jul 8, 8:30 PM EDT	TSTM WND GST 60	Norwood, PA
Jul 8, 8:35 PM EDT	TSTM WND DMG	Mount Airy, PA	LARGE TREE SNAPPED AND FELL ONTO A CAR.
Jul 8, 8:36 PM EDT	TSTM WND GST 59	Philadelphia Intl Airpo, PA
Jul 8, 8:42 PM EDT	TSTM WND DMG	Lower Moreland Twp, PA	MULTIPLE TREES AND WIRES DOWN.
Jul 8, 8:46 PM EDT	TSTM WND GST 56	Northeast Philadelphia, 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.

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

The nearest sounding before it

Washington/Dulle, VA (KIAD), launched 00:00Z, 0.1 hours before the alert went out and 211 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 1479 m above ground
0-6 km bulk shear: 39 kt
0-1 km storm-relative helicity: 158 m²/s²
0-3 km storm-relative helicity: 178 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.

270 
WUUS51 KPHI 090006
SVRPHI
PAC045-091-101-090130-
/O.NEW.KPHI.SV.W.0102.140709T0006Z-140709T0130Z/

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

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  MONTGOMERY COUNTY IN SOUTHEAST PENNSYLVANIA...
  PHILADELPHIA COUNTY IN SOUTHEAST PENNSYLVANIA...
  DELAWARE COUNTY IN SOUTHEAST PENNSYLVANIA...

* UNTIL 930 PM EDT

* AT 802 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM. THE STORM WAS NEAR SOUTH POTTSTOWN...MOVING
  NORTHEAST AT 40 MPH. THIS STORM IS CAPABLE OF PRODUCING DAMAGING
  WINDS IN EXCESS OF 60 MPH. 

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  SOUDERTON AND EAST GREENVILLE AROUND 815 PM EDT...
  HATBORO AND WILLOW GROVE AROUND 820 PM EDT...
  NORTHEAST PHILADELPHIA AROUND 825 PM EDT...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THIS IS A DANGEROUS STORM. IF YOU ARE IN ITS PATH...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. OTHER STORMS WILL BE MOVING INTO DELAWARE 
AND PHILADELPHIA COUNTIES A LITTLE LATER.

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 4044 7553 4009 7495 4002 7502 3995 7514
      3988 7515 3985 7534 3980 7541 3983 7548
      3984 7560 3988 7560 4007 7536 4009 7546
      4012 7546 4014 7551 4016 7550 4015 7553
      4024 7560 4022 7561 4024 7570
TIME...MOT...LOC 0006Z 242DEG 63KT 4027 7558

$$

FORECASTER:JJM

2 follow-up statements

439 
WWUS51 KPHI 090033
SVSPHI

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

PAC045-091-101-090130-
/O.CON.KPHI.SV.W.0102.000000T0000Z-140709T0130Z/
MONTGOMERY PA-PHILADELPHIA PA-DELAWARE PA-
833 PM EDT TUE JUL 8 2014

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 930 PM EDT
FOR DELAWARE...PHILADELPHIA AND MONTGOMERY COUNTIES...

AT 830 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A SEVERE THUNDERSTORMS CAPABLE OF PRODUCING QUARTER SIZE
HAIL...AND DESTRUCTIVE WINDS IN EXCESS OF 70 MPH.  ONE STORM WAS
LOCATED NEAR DREXEL HILL...OR 9 MILES SOUTHWEST OF PHILADELPHIA...
MOVING EAST AT 50 MPH.

THE SEVERE THUNDERSTORM WILL BE NEAR...
  CENTER CITY...KENSINGTON...PHILADELPHIA AND GERMANTOWN BY 840 PM
  EDT...
  WISSINOMING...TACONY...6 MILES SOUTH OF ROCKLEDGE AND 8 MILES SOUTH
  OF JENKINTOWN BY 845 PM EDT...
  HOLMESBURG AND 6 MILES SOUTH OF NORTHEAST PHILADELPHIA BY 850 PM
  EDT...

THESE ARE DANGEROUS STORMS. IF YOU ARE IN THEIR PATH...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.

THESE STORMS HAVE A HISTORY OF PRODUCING DESTRUCTIVE WINDS AND LARGE
DAMAGING HAIL. SEEK SHELTER NOW INSIDE A STURDY STRUCTURE AND STAY 
AWAY FROM WINDOWS. NUMEROUS POWER OUTAGES HAVE BEEN REPORTED.

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 4044 7553 4009 7495 4002 7502 3995 7514
      3988 7515 3985 7534 3980 7541 3983 7548
      3984 7560 3988 7560 4007 7536 4009 7546
      4012 7546 4014 7551 4016 7550 4015 7553
      4024 7560 4022 7561 4024 7570
TIME...MOT...LOC 0032Z 255DEG 44KT 3995 7526

$$
JJM

322 
WWUS51 KPHI 090125
SVSPHI

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

PAC045-091-101-090135-
/O.EXP.KPHI.SV.W.0102.000000T0000Z-140709T0130Z/
MONTGOMERY PA-PHILADELPHIA PA-DELAWARE PA-
925 PM EDT TUE JUL 8 2014

...THE SEVERE THUNDERSTORM WARNING FOR DELAWARE...PHILADELPHIA AND
MONTGOMERY COUNTIES WILL EXPIRE AT 930 PM EDT...

THE THUNDERSTORMS RESPONSIBLE FOR THE WARNING HAVE EXITED THE 
REGION. THE WARNING WILL BE ALLOWED TO EXPIRE.

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 4044 7553 4009 7495 4002 7502 3995 7514
      3988 7515 3985 7534 3980 7541 3983 7548
      3984 7560 3988 7560 4007 7536 4009 7546
      4012 7546 4014 7551 4016 7550 4015 7553
      4024 7560 4022 7561 4024 7570
TIME...MOT...LOC 0125Z 255DEG 44KT 4012 7444

$$

JJM

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 8, 8:25 PM EDT	Severe Thunderstorm Warning	PHI	Bucks, Lehigh, Northampton	59 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.