Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 164, NWS Philadelphia/Mount Holly

July 8, 20117 counties in Pennsylvania; Hunterdon County, Warren County, New Jersey

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Jul 8, 2011, 3:44 PM EDT for 7 counties in Pennsylvania; Hunterdon County, Warren County, New Jersey. It was in force for 76 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: Jul 8, 2011, 3:44 PM EDT (19:44 UTC)
Expired: Jul 8, 2011, 5:00 PM EDT
In force: 76 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon

Counties Hunterdon County, NJ, Warren County, NJ, Berks County, PA, Bucks County, PA, Carbon County, PA, Lehigh County, PA, Monroe County, PA, Montgomery County, PA, Northampton County, PA

The radar

The Philadelphia radar (KDIX), 112 km from the middle of the area, began a volume at 19:44 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 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, 1:51 PM EDT	Severe Thunderstorm Watch	SPC	7 hr

The nearest sounding before it

Phillips Aaf/Abe, MD (KAPG), launched 12:00Z, 7.7 hours before the alert went out and 161 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: 1352 J/kg
Mixed-layer CIN: -35 J/kg
Mixed-layer LCL: 668 m above ground
0-6 km bulk shear: 36 kt
0-1 km storm-relative helicity: 88 m²/s²
0-3 km storm-relative helicity: 134 m²/s²
Significant tornado parameter: 0.5
Supercell composite: 2.9

Open this sounding in Storm Lab

The text

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

888 
WUUS51 KPHI 081944
SVRPHI
NJC019-041-PAC011-017-025-077-089-091-095-082100-
/O.NEW.KPHI.SV.W.0164.110708T1944Z-110708T2100Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
344 PM EDT FRI JUL 8 2011

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  EASTERN BERKS COUNTY IN EASTERN PENNSYLVANIA...
  LEHIGH COUNTY IN EASTERN PENNSYLVANIA...
  THIS INCLUDES THE CITY OF ALLENTOWN...
  NORTHAMPTON COUNTY IN EASTERN PENNSYLVANIA...
  THIS INCLUDES THE CITY OF EASTON...
  SOUTHERN CARBON COUNTY IN NORTHEAST PENNSYLVANIA...
  THIS INCLUDES THE CITY OF LEHIGHTON...
  SOUTHERN MONROE COUNTY IN NORTHEAST PENNSYLVANIA...
  HUNTERDON COUNTY IN NORTHWEST NEW JERSEY...
  WARREN COUNTY IN NORTHWEST NEW JERSEY...
  NORTHWESTERN BUCKS COUNTY IN SOUTHEAST PENNSYLVANIA...
  NORTHWESTERN MONTGOMERY COUNTY IN SOUTHEAST PENNSYLVANIA...

* UNTIL 500 PM EDT

* AT 340 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 NEAR
  PERKASIE...OR 16 MILES SOUTH OF ALLENTOWN...AND MOVING NORTH AT 35
  MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  QUAKERTOWN AROUND 350 PM EDT...
  PLEASANT VALLEY AROUND 400 PM EDT...
  HELLERTOWN AND SPRINGTOWN AROUND 405 PM EDT...
  BETHLEHEM AROUND 410 PM EDT...
  OLD ORCHARD AROUND 415 PM EDT...
  BATH...NAZARETH AND BEERSVILLE AROUND 425 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.

IN ADDITION TO LARGE HAIL AND DAMAGING WINDS...HEAVY RAIN WILL OCCUR
WITH THESE STORMS AND CAUSE LOW-LYING AND POOR DRAINAGE FLOODING.

PLEASE REPORT HAIL OR STRONG WINDS TO THE NATIONAL WEATHER SERVICE BY
CALLING TOLL FREE...1-877-633-6772...WHEN YOU CAN DO SO SAFELY.

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 900 PM EDT FRIDAY
EVENING FOR DELAWARE AND NORTHEASTERN MARYLAND AND NEW JERSEY AND
EASTERN PENNSYLVANIA.

&&

LAT...LON 4097 7484 4081 7484 4078 7489 4075 7484
      4041 7484 4024 7573 4066 7595 4074 7578
      4082 7589 4105 7492
TIME...MOT...LOC 1944Z 180DEG 29KT 4041 7537

$$

NIERENBERG

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 7, 8:56 PM EDT	Special Weather Statement	PHI	Carbon	94 min
Jul 7, 9:10 PM EDT	Severe Thunderstorm Warning	PHI	Carbon	67 min
Jul 7, 9:47 PM EDT	Severe Thunderstorm Warning	PHI	Carbon, Lehigh, Northampton	73 min
Jul 7, 10:55 PM EDT	Severe Thunderstorm Warning	PHI	Lehigh, Northampton	28 min
Jul 8, 2:40 AM EDT	Special Weather Statement	PHI	Berks	65 min
Jul 8, 3:58 AM EDT	Flash Flood Watch	PHI	Berks, Carbon, Delaware, Lehigh, Monroe, Northampton and 1 more	19 hr
Jul 8, 12:56 PM EDT	Special Weather Statement	PHI	Philadelphia	64 min
Jul 8, 2:12 PM EDT	Special Weather Statement	PHI	Delaware, Philadelphia	93 min
Jul 8, 2:23 PM EDT	Special Weather Statement	PHI	Monroe, Northampton	82 min
Jul 8, 2:25 PM EDT	Areal Flood Advisory	PHI	Bucks, Chester, Delaware, Montgomery, Philadelphia	7 hr
Jul 8, 2:48 PM EDT	Severe Thunderstorm Warning	PHI	Monroe	57 min
Jul 8, 2:51 PM EDT	Severe Thunderstorm Warning	PHI	Bucks	54 min
Jul 8, 2:56 PM EDT	Areal Flood Advisory	PHI	Bucks, Chester, Montgomery	3 hr
Jul 8, 3:35 PM EDT	Special Weather Statement	PHI	Montgomery	55 min
Jul 8, 3:40 PM EDT	Areal Flood Advisory	PHI	Berks, Lehigh, Northampton	3 hr
Jul 8, 3:45 PM EDT	Flash Flood Warning	PHI	Philadelphia	3 hr
Jul 8, 4:18 PM EDT	Flash Flood Warning	PHI	Monroe	2 hr
Jul 8, 4:29 PM EDT	Areal Flood Advisory	PHI	Chester	4 hr
Jul 8, 5:33 PM EDT	Areal Flood Advisory	PHI	Bucks	3 hr
Jul 8, 5:44 PM EDT	Flash Flood Warning	PHI	Delaware, Philadelphia	3 hr
Jul 7, 8:40 PM EDT	Severe Thunderstorm Warning	PHI	Atlantic, Cape May, Cumberland	80 min
Jul 7, 8:42 PM EDT	Special Marine Warning	PHI		2 hr
Jul 7, 10:07 PM EDT	Special Weather Statement	PHI	Cape May	53 min
Jul 8, 4:34 AM EDT	Special Weather Statement	PHI	Hunterdon	56 min
Jul 8, 12:03 PM EDT	Special Weather Statement	PHI	Atlantic	57 min
Jul 8, 3:03 PM EDT	Special Weather Statement	PHI	Mercer	57 min
Jul 8, 3:14 PM EDT	Severe Thunderstorm Warning	PHI	Hunterdon, Mercer, Middlesex, Somerset	66 min
Jul 8, 3:33 PM EDT	Areal Flood Advisory	PHI	Mercer, Middlesex, Somerset	3 hr
Jul 8, 3:48 PM EDT	Flash Flood Warning	PHI	Camden	3 hr
Jul 8, 3:51 PM EDT	Severe Thunderstorm Warning	PHI	Hunterdon, Middlesex, Morris, Somerset, Sussex, Warren	69 min
Jul 8, 4:10 PM EDT	Flash Flood Warning	PHI	Hunterdon, Morris, Somerset, Sussex, Warren	3 hr
Jul 8, 4:42 PM EDT	Severe Thunderstorm Warning	PHI	Morris, Sussex, Warren	78 min
Jul 8, 4:50 PM EDT	Severe Thunderstorm Warning	PHI	Atlantic, Burlington, Camden	70 min
Jul 8, 5:03 PM EDT	Flash Flood Warning	PHI	Sussex	117 min
Jul 8, 5:03 PM EDT	Tornado Warning	PHI	Atlantic, Burlington, Camden	27 min
Jul 8, 6:32 PM EDT	Special Marine Warning	PHI		58 min
Jul 8, 7:13 PM EDT	Severe Thunderstorm Warning	PHI	Atlantic, Burlington, Cape May, Cumberland, Ocean	77 min
Jul 8, 7:24 PM EDT	Areal Flood Advisory	PHI	Atlantic, Burlington, Cape May, Cumberland, Monmouth, Ocean	3 hr
Jul 8, 7:26 PM EDT	Special Marine Warning	PHI		64 min
Jul 8, 7:50 PM EDT	Special Marine Warning	PHI		55 min

Nearby

Severe Thunderstorm Warnings in Pennsylvania, 2011 Severe Thunderstorm Warnings in New Jersey, 2011 Every 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.