Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 143, NWS Philadelphia/Mount Holly

July 28, 20125 counties in Pennsylvania; Hunterdon County, New Jersey

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Jul 28, 2012, 8:05 PM EDT for 5 counties in Pennsylvania; Hunterdon County, New Jersey. It was in force for 55 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: Jul 28, 2012, 8:05 PM EDT (00:05 UTC)
Expired: Jul 28, 2012, 9:00 PM EDT
In force: 55 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon

Counties Hunterdon County, NJ, Berks County, PA, Bucks County, PA, Lehigh 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 00:06 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 28, 8:08 PM EDT	HAIL 1	Pennsburg, PA	QUARTER SIZE HAIL REPORTED IN PENNSBURG.

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 28, 1:36 PM EDT	Severe Thunderstorm Watch	SPC	8 hr

The nearest sounding before it

Brookhaven, NY (KOKX), launched 00:00Z, 0.1 hours before the alert went out and 217 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: 69 J/kg
Mixed-layer CIN: -143 J/kg
Mixed-layer LCL: 656 m above ground
0-6 km bulk shear: 23 kt
0-1 km storm-relative helicity: -7 m²/s²
0-3 km storm-relative helicity: 20 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.

008 
WUUS51 KPHI 290005
SVRPHI
NJC019-PAC011-017-077-091-095-290100-
/O.NEW.KPHI.SV.W.0143.120729T0005Z-120729T0100Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
805 PM EDT SAT JUL 28 2012

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTHEASTERN BERKS COUNTY IN EASTERN PENNSYLVANIA...
  LEHIGH COUNTY IN EASTERN PENNSYLVANIA...
  THIS INCLUDES THE CITY OF ALLENTOWN...
  SOUTHERN NORTHAMPTON COUNTY IN EASTERN PENNSYLVANIA...
  WEST CENTRAL HUNTERDON COUNTY IN NORTHWEST NEW JERSEY...
  NORTHWESTERN BUCKS COUNTY IN SOUTHEAST PENNSYLVANIA...
  NORTHWESTERN MONTGOMERY COUNTY IN SOUTHEAST PENNSYLVANIA...

* UNTIL 900 PM EDT

* AT 801 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
  ZIONSVILLE...OR 10 MILES SOUTHWEST OF ALLENTOWN...AND MOVING EAST
  AT 15 MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  ZIONSVILLE...EAST GREENVILLE AND EMMAUS AROUND 815 PM EDT...
  GERYVILLE AROUND 820 PM EDT...
  QUAKERTOWN AROUND 850 PM EDT...
  PLEASANT VALLEY AND 6 MILES NORTH OF PERKASIE AROUND 900 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 4065 7598 4067 7593 4067 7518 4065 7520
      4063 7519 4062 7520 4059 7519 4067 7507
      4067 7503 4036 7504 4035 7605
TIME...MOT...LOC 0005Z 270DEG 13KT 4046 7555

$$

HAYES

3 follow-up statements

945 
WWUS51 KPHI 290021
SVSPHI

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
821 PM EDT SAT JUL 28 2012

PAC011-290032-
/O.CAN.KPHI.SV.W.0143.000000T0000Z-120729T0100Z/
BERKS PA-
821 PM EDT SAT JUL 28 2012

...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN BERKS 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.

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 1000 PM EDT
SATURDAY EVENING FOR NORTHERN DELAWARE AND NORTHEASTERN MARYLAND AND
NEW JERSEY AND EASTERN PENNSYLVANIA.

LAT...LON 4036 7505 4036 7559 4038 7559 4044 7553
      4048 7558 4066 7556 4067 7518 4065 7520
      4059 7519 4067 7507 4067 7503
TIME...MOT...LOC 0022Z 270DEG 13KT 4046 7547

$$

NJC019-PAC017-077-091-095-290100-
/O.CON.KPHI.SV.W.0143.000000T0000Z-120729T0100Z/
HUNTERDON NJ-BUCKS PA-LEHIGH PA-MONTGOMERY PA-NORTHAMPTON PA-
821 PM EDT SAT JUL 28 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 900 PM EDT
FOR SOUTHERN NORTHAMPTON...NORTHWESTERN MONTGOMERY...SOUTHEASTERN
LEHIGH...NORTHWESTERN BUCKS AND WEST CENTRAL HUNTERDON COUNTIES...

AT 821 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE
HAIL...AND DAMAGING WINDS IN EXCESS OF 60 MPH.  THIS STORM WAS
LOCATED NEAR ZIONSVILLE...OR 9 MILES SOUTH OF ALLENTOWN...MOVING EAST
AT 15 MPH.

THE SEVERE THUNDERSTORM WILL BE NEAR...
  TRUMBAUERSVILLE AND COOPERSBURG BY 840 PM EDT...
  QUAKERTOWN AND 9 MILES SOUTH OF HELLERTOWN BY 850 PM EDT...
  RICHLANDTOWN AND PLEASANT VALLEY BY 855 PM EDT...
  6 MILES NORTH OF PERKASIE...6 MILES WEST OF BEDMINSTER...7 MILES
  SOUTH OF SPRINGTOWN AND 7 MILES WEST OF OTTSVILLE BY 900 PM EDT...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4036 7505 4036 7559 4038 7559 4044 7553
      4048 7558 4066 7556 4067 7518 4065 7520
      4059 7519 4067 7507 4067 7503
TIME...MOT...LOC 0022Z 270DEG 13KT 4046 7547

$$

HAYES

764 
WWUS51 KPHI 290036
SVSPHI

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
836 PM EDT SAT JUL 28 2012

PAC095-290046-
/O.CAN.KPHI.SV.W.0143.000000T0000Z-120729T0100Z/
NORTHAMPTON PA-
836 PM EDT SAT JUL 28 2012

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHERN NORTHAMPTON 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.

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 1000 PM EDT
SATURDAY EVENING FOR NORTHERN DELAWARE AND NORTHEASTERN MARYLAND AND
NEW JERSEY AND EASTERN PENNSYLVANIA.

LAT...LON 4036 7505 4036 7559 4038 7559 4044 7553
      4048 7558 4056 7556 4058 7540 4054 7533
      4059 7524 4059 7518 4061 7516 4061 7503
TIME...MOT...LOC 0036Z 270DEG 13KT 4046 7540

$$

NJC019-PAC017-077-091-290100-
/O.CON.KPHI.SV.W.0143.000000T0000Z-120729T0100Z/
HUNTERDON NJ-BUCKS PA-LEHIGH PA-MONTGOMERY PA-
836 PM EDT SAT JUL 28 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 900 PM EDT
FOR NORTHWESTERN MONTGOMERY...SOUTHEASTERN LEHIGH...NORTHWESTERN
BUCKS AND WEST CENTRAL HUNTERDON COUNTIES...

AT 833 PM EDT...A SEVERE THUNDERSTORM WAS REPORTED CAPABLE OF
PRODUCING QUARTER SIZE HAIL...AND DAMAGING WINDS IN EXCESS OF 60 MPH.
 THIS STORM WAS LOCATED NEAR TRUMBAUERSVILLE...OR 10 MILES SOUTH OF
ALLENTOWN...MOVING EAST AT 15 MPH.

THE SEVERE THUNDERSTORM WILL BE NEAR...
  QUAKERTOWN BY 850 PM EDT...
  RICHLANDTOWN AND PLEASANT VALLEY BY 855 PM EDT...
  6 MILES NORTH OF PERKASIE...6 MILES WEST OF BEDMINSTER...7 MILES
  SOUTH OF SPRINGTOWN AND 7 MILES WEST OF OTTSVILLE BY 900 PM EDT...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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 4036 7505 4036 7559 4038 7559 4044 7553
      4048 7558 4056 7556 4058 7540 4054 7533
      4059 7524 4059 7518 4061 7516 4061 7503
TIME...MOT...LOC 0036Z 270DEG 13KT 4046 7540

$$

HAYES

342 
WWUS51 KPHI 290053
SVSPHI

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
853 PM EDT SAT JUL 28 2012

NJC019-PAC017-077-091-290103-
/O.EXP.KPHI.SV.W.0143.000000T0000Z-120729T0100Z/
HUNTERDON NJ-BUCKS PA-LEHIGH PA-MONTGOMERY PA-
853 PM EDT SAT JUL 28 2012

...THE SEVERE THUNDERSTORM WARNING FOR NORTHWESTERN MONTGOMERY...
SOUTHEASTERN LEHIGH...NORTHWESTERN BUCKS AND WEST CENTRAL HUNTERDON
COUNTIES WILL EXPIRE AT 900 PM EDT...

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

LAT...LON 4036 7505 4036 7559 4038 7559 4044 7553
      4048 7558 4056 7556 4058 7540 4054 7533
      4059 7524 4059 7518 4061 7516 4061 7503
TIME...MOT...LOC 0053Z 270DEG 13KT 4046 7532

$$

HAYES

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 28, 8:02 PM EDT	Areal Flood Advisory	PHI	Bucks, Montgomery	2 hr
Jul 28, 8:19 PM EDT	Severe Thunderstorm Warning	PHI	Bucks, Montgomery	56 min
Jul 28, 8:26 PM EDT	Areal Flood Advisory	PHI	Bucks, Montgomery, Philadelphia	101 min
Jul 28, 8:38 PM EDT	Severe Thunderstorm Warning	PHI	Bucks	67 min
Jul 28, 8:41 PM EDT	Special Weather Statement	PHI	Delaware	64 min
Jul 28, 9:11 PM EDT	Special Weather Statement	PHI	Bucks, Philadelphia	64 min
Jul 29, 3:03 PM EDT	Special Weather Statement	PHI	Berks, Lehigh	57 min
Jul 29, 3:40 PM EDT	Areal Flood Advisory	PHI	Berks, Chester	74 min
Jul 29, 5:32 PM EDT	Special Weather Statement	PHI	Carbon, Lehigh, Northampton	58 min
Jul 29, 6:08 PM EDT	Areal Flood Advisory	PHI	Carbon	86 min
Jul 28, 8:11 PM EDT	Special Marine Warning	PHI		64 min
Jul 28, 8:43 PM EDT	Special Marine Warning	PHI		62 min
Jul 28, 9:14 PM EDT	Special Marine Warning	PHI		61 min
Jul 28, 9:21 PM EDT	Severe Thunderstorm Warning	PHI	Cape May	23 min
Jul 28, 9:24 PM EDT	Severe Thunderstorm Warning	PHI	Mercer, Middlesex, Monmouth	66 min
Jul 28, 9:42 PM EDT	Special Marine Warning	PHI		63 min
Jul 28, 9:46 PM EDT	Special Weather Statement	PHI	Burlington, Ocean	59 min
Jul 28, 9:52 PM EDT	Areal Flood Advisory	PHI	Middlesex, Monmouth	118 min
Jul 28, 9:52 PM EDT	Special Weather Statement	PHI	Camden	53 min
Jul 28, 10:09 PM EDT	Special Marine Warning	PHI		66 min
Jul 28, 10:23 PM EDT	Severe Thunderstorm Warning	PHI	Monmouth	32 min
Jul 28, 10:31 PM EDT	Special Marine Warning	PHI		59 min
Jul 28, 10:39 PM EDT	Special Weather Statement	PHI	Ocean	66 min
Jul 29, 12:22 AM EDT	Special Marine Warning	PHI		23 min
Jul 29, 1:20 PM EDT	Special Weather Statement	PHI	Atlantic	55 min
Jul 29, 1:42 PM EDT	Areal Flood Advisory	PHI	Cape May	2 hr
Jul 29, 2:59 PM EDT	Special Weather Statement	PHI	Cape May	61 min
Jul 29, 3:35 PM EDT	Special Weather Statement	PHI	Atlantic	55 min
Jul 29, 4:41 PM EDT	Special Weather Statement	PHI	Hunterdon, Morris, Somerset	64 min
Jul 29, 5:53 PM EDT	Special Weather Statement	PHI	Middlesex	52 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.