Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 92, NWS Philadelphia/Mount Holly

July 15, 20124 counties in Pennsylvania; Hunterdon County, Warren County, New Jersey

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Jul 15, 2012, 7:04 PM EDT for 4 counties in Pennsylvania; Hunterdon County, Warren County, New Jersey. It was in force for 56 min. 3 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 15, 2012, 7:04 PM EDT (23:04 UTC)
Expired: Jul 15, 2012, 8:00 PM EDT
In force: 56 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon

Counties Hunterdon County, NJ, Warren County, NJ, Bucks County, PA, Lehigh County, PA, Monroe County, PA, Northampton County, PA

The radar

The Philadelphia radar (KDIX), 117 km from the middle of the area, began a volume at 23:05 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 15, 7:25 PM EDT	TSTM WND DMG	Tatamy, PA	TREE DOWN
Jul 15, 7:30 PM EDT	TSTM WND DMG	Forks Twp, PA	TREE DOWN.
Jul 15, 7:35 PM EDT	TSTM WND DMG	Easton, PA	WIRES DOWN. NORTHAMPTON COUNTY REPORTED A FEW TREES DOWN WITHIN THE COUNTY.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Brookhaven, NY (KOKX), launched 12:00Z, 11.1 hours before the alert went out and 207 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: 88 J/kg
Mixed-layer CIN: -110 J/kg
Mixed-layer LCL: 912 m above ground
0-6 km bulk shear: 22 kt
0-1 km storm-relative helicity: 79 m²/s²
0-3 km storm-relative helicity: 97 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.

086 
WUUS51 KPHI 152304
SVRPHI
NJC019-041-PAC017-077-089-095-160000-
/O.NEW.KPHI.SV.W.0092.120715T2304Z-120716T0000Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
704 PM EDT SUN JUL 15 2012

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A

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

* UNTIL 800 PM EDT

* AT 701 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING DESTRUCTIVE WINDS IN
  EXCESS OF 70 MPH.  THIS STORM WAS LOCATED 7 MILES NORTH OF
  COFFEETOWN...OR 8 MILES SOUTHEAST OF LEHIGHTON...AND MOVING EAST AT
  40 MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  BEERSVILLE AND NORTHAMPTON AROUND 710 PM EDT...
  BATH AROUND 715 PM EDT...
  NAZARETH...TATAMY AND BELFAST AROUND 725 PM EDT...
  FORKS...EASTON...WILSON AND GLENDON AROUND 730 PM EDT...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THIS IS A DANGEROUS STORM. IF YOU ARE IN ITS PATH...PREPARE
IMMEDIATELY FOR DAMAGING WINDS...LARGE HAIL...AND DEADLY CLOUD TO
GROUND LIGHTNING. PEOPLE OUTSIDE SHOULD MOVE TO A SHELTER...
PREFERABLY INSIDE A STRONG BUILDING BUT AWAY FROM WINDOWS.

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.

&&

LAT...LON 4049 7498 4060 7561 4080 7555 4082 7547
      4089 7553 4090 7553 4091 7491
TIME...MOT...LOC 2304Z 279DEG 37KT 4074 7557

$$

AMC

2 follow-up statements

642 
WWUS51 KPHI 152336
SVSPHI

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
736 PM EDT SUN JUL 15 2012

PAC089-152345-
/O.CAN.KPHI.SV.W.0092.000000T0000Z-120716T0000Z/
MONROE PA-
736 PM EDT SUN JUL 15 2012

...THE SEVERE THUNDERSTORM WARNING FOR SOUTH CENTRAL MONROE COUNTY IS
CANCELLED...

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.

LAT...LON 4049 7498 4060 7561 4080 7555 4082 7548
      4082 7543 4087 7528 4091 7523 4091 7491
TIME...MOT...LOC 2335Z 279DEG 37KT 4065 7526

$$

NJC019-041-PAC017-077-095-160000-
/O.CON.KPHI.SV.W.0092.000000T0000Z-120716T0000Z/
WARREN NJ-HUNTERDON NJ-BUCKS PA-LEHIGH PA-NORTHAMPTON PA-
736 PM EDT SUN JUL 15 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 800 PM EDT
FOR NORTHAMPTON...CENTRAL LEHIGH...NORTH CENTRAL BUCKS...NORTHWESTERN
HUNTERDON AND SOUTHERN WARREN COUNTIES...

AT 731 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A SEVERE THUNDERSTORM CAPABLE OF PRODUCING DAMAGING WINDS IN
EXCESS OF 60 MPH.  THIS STORM WAS LOCATED NEAR FREEMANSBURG...OR NEAR
EASTON...MOVING EAST AT 45 MPH.

THE SEVERE THUNDERSTORM WILL BE NEAR...
  ALPHA...RIEGELSVILLE...PHILLIPSBURG AND 7 MILES NORTH OF FERNDALE
  BY 740 PM EDT...
  BLOOMSBURY BY 745 PM EDT...
  MILFORD...6 MILES NORTH OF FRENCHTOWN AND 9 MILES SOUTH OF PLEASANT
  VALLEY BY 750 PM EDT...
  7 MILES SOUTH OF HAMPTON BY 755 PM EDT...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THIS STORM HAS A HISTORY OF PRODUCING DAMAGING WINDS WITH TREES AND 
WIRES DOWN IN LEHIGH COUNTY. SEEK SHELTER NOW INSIDE A STURDY 
STRUCTURE AND STAY AWAY FROM WINDOWS!

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.

&&

LAT...LON 4049 7498 4060 7561 4080 7555 4082 7548
      4082 7543 4087 7528 4091 7523 4091 7491
TIME...MOT...LOC 2335Z 279DEG 37KT 4065 7526

$$

AMC

120 
WWUS51 KPHI 152354
SVSPHI

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
754 PM EDT SUN JUL 15 2012

NJC019-041-PAC017-077-095-160002-
/O.EXP.KPHI.SV.W.0092.000000T0000Z-120716T0000Z/
WARREN NJ-HUNTERDON NJ-BUCKS PA-LEHIGH PA-NORTHAMPTON PA-
754 PM EDT SUN JUL 15 2012

...THE SEVERE THUNDERSTORM WARNING FOR NORTHAMPTON...CENTRAL
LEHIGH...NORTH CENTRAL BUCKS...NORTHWESTERN HUNTERDON AND SOUTHERN
WARREN COUNTIES WILL EXPIRE AT 800 PM EDT...

AT THIS TIME IT APPEARS THAT MOST THUNDERSTORMS IN THE WARNED AREA 
HAVE WEAKENED TO BELOW SEVERE LEVELS.

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.

LAT...LON 4049 7498 4060 7561 4080 7555 4082 7548
      4082 7543 4087 7528 4091 7523 4091 7491
TIME...MOT...LOC 2352Z 279DEG 37KT 4062 7503

$$

AMC

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 15, 12:51 PM EDT	Special Weather Statement	PHI	Lehigh	39 min
Jul 15, 1:31 PM EDT	Special Weather Statement	PHI	Berks, Carbon, Lehigh, Monroe, Northampton	59 min
Jul 15, 2:34 PM EDT	Special Weather Statement	PHI	Bucks	56 min
Jul 15, 2:41 PM EDT	Special Weather Statement	PHI	Carbon	64 min
Jul 15, 2:50 PM EDT	Special Weather Statement	PHI	Carbon	55 min
Jul 15, 3:29 PM EDT	Special Weather Statement	PHI	Bucks	61 min
Jul 15, 3:44 PM EDT	Excessive Heat Warning	PHI	Delaware, Philadelphia	4 days
Jul 15, 5:07 PM EDT	Special Weather Statement	PHI	Carbon, Monroe	53 min
Jul 15, 5:58 PM EDT	Special Weather Statement	PHI	Monroe	62 min
Jul 15, 6:13 PM EDT	Severe Thunderstorm Warning	PHI	Carbon	62 min
Jul 15, 6:40 PM EDT	Severe Thunderstorm Warning	PHI	Lehigh, Northampton	65 min
Jul 15, 7:58 PM EDT	Special Weather Statement	PHI	Berks, Bucks	62 min
Jul 15, 4:01 PM EDT	Special Weather Statement	PHI	Mercer	59 min
Jul 15, 4:59 PM EDT	Special Weather Statement	PHI	Ocean	61 min
Jul 15, 6:10 PM EDT	Special Marine Warning	PHI		65 min
Jul 15, 6:54 PM EDT	Special Marine Warning	PHI		24 min
Jul 15, 7:44 PM EDT	Special Weather Statement	PHI	Hunterdon, Somerset	61 min

Nearby

Severe Thunderstorm Warnings in Pennsylvania, 2012 Severe Thunderstorm Warnings in New Jersey, 2012 Every severe thunderstorm warning in 2012

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.