Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 188, NWS Philadelphia/Mount Holly

August 9, 2012Berks County, Carbon County, Lehigh County, Pennsylvania

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Aug 9, 2012, 7:10 PM EDT for Berks County, Carbon County, Lehigh County, Pennsylvania. It was in force for 80 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: Aug 9, 2012, 7:10 PM EDT (23:10 UTC)
Expired: Aug 9, 2012, 8:30 PM EDT
In force: 80 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon

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

The radar

The Philadelphia radar (KDIX), 156 km from the middle of the area, began a volume at 23:10 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
Aug 9, 7:10 PM EDT	TSTM WND DMG	Tulpehocken Twp, PA	TREES AND WIRES DOWN IN WESTERN BERKS COUNTY.
Aug 9, 7:30 PM EDT	TSTM WND DMG	Tulpehocken Twp, PA	TREES AND WIRES DOWN.
Aug 9, 7:50 PM EDT	TSTM WND DMG	Upper Bern Twp, PA	TREE DOWN.
Aug 9, 8:30 PM EDT	TSTM WND DMG	Maiden Creek, PA	TREE DOWN.

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

The nearest sounding before it

Phillips Aaf/Abe, MD (KAPG), launched 12:00Z, 11.2 hours before the alert went out and 121 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: 1906 J/kg
Mixed-layer CIN: -18 J/kg
Mixed-layer LCL: 754 m above ground
0-6 km bulk shear: 10 kt
0-1 km storm-relative helicity: 46 m²/s²
0-3 km storm-relative helicity: 37 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.

810 
WUUS51 KPHI 092310
SVRPHI
PAC011-025-077-100030-
/O.NEW.KPHI.SV.W.0188.120809T2310Z-120810T0030Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
710 PM EDT THU AUG 9 2012

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A

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

* UNTIL 830 PM EDT

* AT 706 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED 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 11 MILES NORTH OF STRAUSSTOWN
  TO STRAUSSTOWN TO 10 MILES WEST OF WOMELSDORF...OR ALONG A LINE
  EXTENDING FROM 26 MILES NORTHWEST OF READING TO 21 MILES NORTHWEST
  OF READING TO 22 MILES NORTH OF LANCASTER...AND MOVING EAST AT 20
  MPH.

* SEVERE THUNDERSTORMS WILL BE NEAR...
  STRAUSSTOWN AROUND 725 PM EDT...
  WOMELSDORF AROUND 735 PM EDT...
  WERNERSVILLE AND BERNVILLE AROUND 750 PM EDT...
  SINKING SPRING AND HAMBURG AROUND 800 PM EDT...
  SHOEMAKERSVILLE AROUND 810 PM EDT...
  NEW MAHONING...WANAMAKERS AND LENHARTSVILLE AROUND 815 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.

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

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 4052 7636 4052 7624 4058 7606 4058 7602
      4065 7599 4074 7577 4084 7591 4090 7568
      4064 7573 4038 7582 4029 7613 4036 7621
      4038 7626 4045 7638
TIME...MOT...LOC 2310Z 248DEG 18KT 4066 7618 4048 7626
          4035 7636

$$

HEAVENER

3 follow-up statements

757 
WWUS51 KPHI 092347
SVSPHI

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
747 PM EDT THU AUG 9 2012

PAC025-092357-
/O.CAN.KPHI.SV.W.0188.000000T0000Z-120810T0030Z/
CARBON PA-
747 PM EDT THU AUG 9 2012

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHWESTERN CARBON 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 4052 7635 4052 7624 4058 7606 4058 7602
      4065 7599 4076 7571 4064 7573 4038 7582
      4029 7613 4036 7621 4045 7637 4046 7638
TIME...MOT...LOC 2347Z 248DEG 18KT 4073 7595 4055 7603
          4042 7613

$$

PAC011-077-100030-
/O.CON.KPHI.SV.W.0188.000000T0000Z-120810T0030Z/
BERKS PA-LEHIGH PA-
747 PM EDT THU AUG 9 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 830 PM EDT
FOR NORTHWESTERN LEHIGH AND WESTERN BERKS COUNTIES...

AT 744 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 8 MILES NORTHWEST OF
WANAMAKERS TO HAMBURG TO BERNVILLE...OR ALONG A LINE EXTENDING FROM
15 MILES SOUTHWEST OF LEHIGHTON TO 16 MILES NORTHWEST OF READING TO
13 MILES NORTHWEST OF READING...MOVING EAST AT 20 MPH.

SEVERE THUNDERSTORMS WILL BE NEAR...
  WHITFIELD...SINKING SPRING AND HAMBURG BY 755 PM EDT...
  WYOMISSING HILLS BY 800 PM EDT...
  CENTERPORT BY 805 PM EDT...
  WANAMAKERS...SHOEMAKERSVILLE AND LEESPORT BY 810 PM EDT...
  LAURELDALE AND WANAMAKERS BY 815 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.

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 4052 7635 4052 7624 4058 7606 4058 7602
      4065 7599 4076 7571 4064 7573 4038 7582
      4029 7613 4036 7621 4045 7637 4046 7638
TIME...MOT...LOC 2347Z 248DEG 18KT 4073 7595 4055 7603
          4042 7613

$$

HEAVENER

215 
WWUS51 KPHI 100001
SVSPHI

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
801 PM EDT THU AUG 9 2012

PAC011-077-100030-
/O.CON.KPHI.SV.W.0188.000000T0000Z-120810T0030Z/
BERKS PA-LEHIGH PA-
801 PM EDT THU AUG 9 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 830 PM EDT
FOR NORTHWESTERN LEHIGH AND WESTERN BERKS COUNTIES...

AT 757 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 6 MILES NORTH OF WANAMAKERS
TO HAMBURG TO BERNVILLE...OR ALONG A LINE EXTENDING FROM 10 MILES
SOUTHWEST OF LEHIGHTON TO 17 MILES NORTH OF READING TO 10 MILES
NORTHWEST OF READING...MOVING EAST AT 20 MPH.

SEVERE THUNDERSTORMS WILL BE NEAR...
  WANAMAKERS...SHOEMAKERSVILLE AND LEESPORT BY 810 PM EDT...
  LAURELDALE...TEMPLE AND LENHARTSVILLE BY 815 PM EDT...
  NEW TRIPOLI BY 825 PM EDT...
  FLEETWOOD BY 830 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.

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 4058 7606 4058 7602 4065 7599 4071 7581
      4073 7579 4076 7571 4064 7573 4038 7582
      4029 7612 4052 7623
TIME...MOT...LOC 0002Z 248DEG 18KT 4076 7586 4058 7594
          4045 7604

$$

HEAVENER

500 
WWUS51 KPHI 100020
SVSPHI

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
820 PM EDT THU AUG 9 2012

PAC011-077-100031-
/O.EXP.KPHI.SV.W.0188.000000T0000Z-120810T0030Z/
BERKS PA-LEHIGH PA-
820 PM EDT THU AUG 9 2012

...THE SEVERE THUNDERSTORM WARNING FOR NORTHWESTERN LEHIGH AND
WESTERN BERKS COUNTIES WILL EXPIRE AT 830 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.

LAT...LON 4058 7606 4058 7602 4065 7599 4071 7581
      4073 7579 4076 7571 4064 7573 4038 7582
      4029 7612 4052 7623
TIME...MOT...LOC 0021Z 248DEG 18KT 4079 7574 4061 7582
          4048 7592

$$

HEAVENER

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 9, 1:00 PM EDT	Special Weather Statement	PHI	Lehigh	60 min
Aug 9, 1:22 PM EDT	Severe Thunderstorm Warning	PHI	Bucks, Montgomery	68 min
Aug 9, 1:26 PM EDT	Areal Flood Advisory	PHI	Bucks, Montgomery	3 hr
Aug 9, 1:33 PM EDT	Special Weather Statement	PHI	Northampton	57 min
Aug 9, 1:42 PM EDT	Special Weather Statement	PHI	Monroe	63 min
Aug 9, 1:45 PM EDT	Special Weather Statement	PHI	Berks	60 min
Aug 9, 2:13 PM EDT	Severe Thunderstorm Warning	PHI	Berks	77 min
Aug 9, 2:20 PM EDT	Severe Thunderstorm Warning	PHI	Northampton	70 min
Aug 9, 2:25 PM EDT	Severe Thunderstorm Warning	PHI	Bucks	65 min
Aug 9, 3:03 PM EDT	Special Weather Statement	PHI	Monroe	87 min
Aug 9, 3:05 PM EDT	Special Weather Statement	PHI	Chester, Montgomery	85 min
Aug 9, 3:11 PM EDT	Areal Flood Advisory	PHI	Carbon, Monroe	6 hr
Aug 9, 3:20 PM EDT	Severe Thunderstorm Warning	PHI	Chester, Montgomery	55 min
Aug 9, 3:39 PM EDT	Special Weather Statement	PHI	Bucks	66 min
Aug 9, 3:57 PM EDT	Areal Flood Advisory	PHI	Chester, Montgomery	104 min
Aug 9, 3:57 PM EDT	Severe Thunderstorm Warning	PHI	Bucks, Montgomery	63 min
Aug 9, 4:18 PM EDT	Special Weather Statement	PHI	Bucks	57 min
Aug 9, 4:33 PM EDT	Severe Thunderstorm Warning	PHI	Bucks	57 min
Aug 9, 4:57 PM EDT	Severe Thunderstorm Warning	PHI	Bucks	78 min
Aug 9, 5:06 PM EDT	Areal Flood Advisory	PHI	Bucks	3 hr
Aug 9, 5:26 PM EDT	Flash Flood Warning	PHI	Bucks	2 hr
Aug 9, 7:01 PM EDT	Special Weather Statement	PHI	Berks	59 min
Aug 9, 7:40 PM EDT	Special Weather Statement	PHI	Carbon, Monroe	95 min
Aug 9, 7:46 PM EDT	Areal Flood Advisory	PHI	Berks	3 hr

Nearby

Severe Thunderstorm Warnings in Pennsylvania, 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.