Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2010

Severe Thunderstorm Warning 152, NWS Philadelphia/Mount Holly

September 22, 20104 counties in Pennsylvania

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Sep 22, 2010, 6:23 PM EDT for 4 counties in Pennsylvania. It was in force for 67 min. 4 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: Sep 22, 2010, 6:23 PM EDT (22:23 UTC)
Expired: Sep 22, 2010, 7:30 PM EDT
In force: 67 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon

Counties Berks County, PA, Carbon County, PA, Lehigh County, PA, Northampton County, PA

What was reported inside it

Time	Report	Where	Remark
Sep 22, 7:10 PM EDT	TSTM WND DMG	Greenwich Twp, PA	TREES DOWN IN GREENWICH TOWNSHIP.
Sep 22, 7:10 PM EDT	TSTM WND GST 60	Allentown, PA	ESTIMATED GUST OF 60 MPH NEAR ALLENTOWN.
Sep 22, 7:10 PM EDT	HAIL 0.75	Nne Allentown, PA	PEA TO PENNY SIZE HAIL REPORTED IN ALLENTOWN.
Sep 22, 7:20 PM EDT	HAIL 0.75	Bernville, PA	PENNY SIZE HAIL REPORTED IN BERNVILLE.

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
Sep 22, 3:43 PM EDT	Severe Thunderstorm Watch	SPC	7 hr

The nearest sounding before it

Phillips Aaf/Abe, MD (KAPG), launched 12:00Z, 10.4 hours before the alert went out and 125 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: 997 m above ground
0-6 km bulk shear: 21 kt
0-1 km storm-relative helicity: 147 m²/s²
0-3 km storm-relative helicity: 140 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.

649 
WUUS51 KPHI 222223
SVRPHI
PAC011-025-077-095-222330-
/O.NEW.KPHI.SV.W.0152.100922T2223Z-100922T2330Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
623 PM EDT WED SEP 22 2010

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  BERKS COUNTY IN EASTERN PENNSYLVANIA...
  THIS INCLUDES THE CITY OF READING...
  LEHIGH COUNTY IN EASTERN PENNSYLVANIA...
  THIS INCLUDES THE CITY OF ALLENTOWN...
  SOUTHWESTERN NORTHAMPTON COUNTY IN EASTERN PENNSYLVANIA...
  SOUTHERN CARBON COUNTY IN NORTHEAST PENNSYLVANIA...
  THIS INCLUDES THE CITY OF LEHIGHTON...

* UNTIL 730 PM EDT

* AT 619 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING DAMAGING WINDS IN
  EXCESS OF 60 MPH.  THESE STORMS WERE LOCATED ALONG A LINE EXTENDING
  FROM 9 MILES WEST OF NESQUEHONING TO 11 MILES NORTHWEST OF HAMBURG
  TO 24 MILES WEST OF STRAUSSTOWN...OR ALONG A LINE EXTENDING FROM 14
  MILES WEST OF LEHIGHTON TO 20 MILES SOUTHWEST OF LEHIGHTON TO 41
  MILES NORTHWEST OF READING...AND MOVING EAST AT 40 MPH.

* SEVERE THUNDERSTORMS WILL BE NEAR...
  NESQUEHONING AROUND 630 PM EDT...
  NEW MAHONING AND WANAMAKERS AROUND 635 PM EDT...
  LEHIGHTON AND NEW TRIPOLI AROUND 640 PM EDT...
  EMERALD...JORDAN VALLEY...STRAUSSTOWN AND LENHARTSVILLE AROUND 645
  PM EDT...
  SLATINGTON AROUND 650 PM EDT...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

IN ADDITION TO LARGE HAIL AND DAMAGING WINDS...CONTINUOUS CLOUD TO
GROUND LIGHTNING IS OCCURRING WITH THIS STORM. MOVE INDOORS
IMMEDIATELY! LIGHTNING IS ONE OF NATURES GREATEST KILLERS.
REMEMBER...IF YOU CAN HEAR THUNDER...YOU ARE CLOSE ENOUGH TO BE
STRUCK BY LIGHTNING.

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

&&

LAT...LON 4051 7643 4054 7618 4060 7605 4059 7603
      4064 7600 4074 7578 4084 7594 4090 7600
      4092 7599 4068 7527 4051 7539 4025 7606
      4036 7621 4036 7624 4049 7644
TIME...MOT...LOC 2223Z 291DEG 37KT 4082 7594 4069 7602
          4056 7658

$$
DRAG

1 follow-up statement

197 
WWUS51 KPHI 222252
SVSPHI

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
652 PM EDT WED SEP 22 2010

PAC011-025-077-095-222330-
/O.CON.KPHI.SV.W.0152.000000T0000Z-100922T2330Z/
BERKS PA-LEHIGH PA-NORTHAMPTON PA-CARBON PA-
652 PM EDT WED SEP 22 2010

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 730 PM EDT
FOR EXTREME SOUTH CENTRAL CARBON...SOUTHERN NORTHAMPTON...LEHIGH AND
BERKS COUNTIES...

AT 650 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING QUARTER
SIZE HAIL...AND DAMAGING WINDS IN EXCESS OF 60 MPH.  THESE STORMS
WERE LOCATED ALONG A LINE EXTENDING FROM WALNUTPORT TO CLAUSSVILLE TO
STRAUSSTOWN...OR ALONG A LINE EXTENDING FROM 10 MILES SOUTHEAST OF
LEHIGHTON TO 9 MILES WEST OF ALLENTOWN TO 19 MILES NORTHWEST OF
READING...MOVING EAST AT 40 MPH.

SEVERE THUNDERSTORMS WILL BE NEAR...
  TOPTON...NORTH CATASAUQUA...LEESPORT AND HOKENDAUQUA BY 700 PM
  EDT...
  LYONS...WERNERSVILLE...MACUNGIE AND FOUNTAIN HILL BY 705 PM EDT...
  ZIONSVILLE AND WYOMISSING HILLS BY 710 PM EDT...

THESE STORMS HAVE PRODUCED WIND DAMAGE ACROSS SCHUYLKILL COUNTY.

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.

IN ADDITION TO LARGE HAIL AND DAMAGING WINDS...FREQUENT CLOUD TO
GROUND LIGHTNING IS OCCURRING WITH THIS STORM. MOVE INDOORS
IMMEDIATELY! LIGHTNING IS ONE OF NATURES NUMBER ONE KILLERS.
REMEMBER...IF YOU CAN HEAR THUNDER...YOU ARE CLOSE ENOUGH TO BE
STRUCK BY LIGHTNING.

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

&&

LAT...LON 4051 7643 4054 7618 4060 7605 4059 7603
      4064 7600 4074 7578 4077 7582 4079 7578
      4068 7527 4051 7539 4025 7606 4036 7621
      4036 7624 4049 7644
TIME...MOT...LOC 2251Z 291DEG 37KT 4072 7556 4057 7563
          4046 7623

$$

GORSE

The office that day

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

Issued	Product	Office	Counties	Lasted
Sep 22, 4:23 PM EDT	Special Weather Statement	PHI	Chester	52 min
Sep 22, 4:32 PM EDT	Special Weather Statement	PHI	Carbon	58 min
Sep 22, 4:49 PM EDT	Special Weather Statement	PHI	Chester	56 min
Sep 22, 5:11 PM EDT	Severe Thunderstorm Warning	PHI	Carbon, Lehigh, Monroe, Northampton	64 min
Sep 22, 5:48 PM EDT	Special Weather Statement	PHI	Monroe, Northampton	87 min
Sep 22, 5:58 PM EDT	Special Weather Statement	PHI	Berks, Lehigh	62 min
Sep 22, 6:18 PM EDT	Severe Thunderstorm Warning	PHI	Carbon, Monroe, Northampton	42 min
Sep 22, 7:07 PM EDT	Severe Thunderstorm Warning	PHI	Berks, Bucks, Lehigh, Monroe, Montgomery, Northampton	53 min

Nearby

Severe Thunderstorm Warnings in Pennsylvania, 2010 Every severe thunderstorm warning in 2010

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.