Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 222, NWS Philadelphia/Mount Holly

August 1, 2011Berks County, Carbon County, Lehigh County, Pennsylvania

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Aug 1, 2011, 4:39 PM EDT for Berks County, Carbon County, Lehigh County, Pennsylvania. It was in force for 42 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: Aug 1, 2011, 4:39 PM EDT (20:39 UTC)
Expired: Aug 1, 2011, 5:21 PM EDT
In force: 42 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), 144 km from the middle of the area, began a volume at 20:38 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 1, 4:50 PM EDT	TSTM WND DMG	Mahoning Twp, PA	TREES DOWN IN MAHONING TOWNSHIP.

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, 8.7 hours before the alert went out and 140 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: 307 J/kg
Mixed-layer CIN: -150 J/kg
Mixed-layer LCL: 1512 m above ground
0-6 km bulk shear: 23 kt
0-1 km storm-relative helicity: -192 m²/s²
0-3 km storm-relative helicity: -166 m²/s²
Significant tornado parameter: 0.0
Supercell composite: -1.5

Open this sounding in Storm Lab

The text

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

902 
WUUS51 KPHI 012039
SVRPHI
PAC011-025-077-012200-
/O.NEW.KPHI.SV.W.0222.110801T2039Z-110801T2200Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
439 PM EDT MON AUG 1 2011

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...
  SOUTHWESTERN CARBON COUNTY IN NORTHEAST PENNSYLVANIA...
  THIS INCLUDES THE CITY OF LEHIGHTON...

* UNTIL 600 PM EDT

* AT 434 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
  NESQUEHONING...OR 11 MILES WEST OF LEHIGHTON...AND MOVING SOUTHEAST
  AT 20 MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  NEW MAHONING AROUND 455 PM EDT...
  WANAMAKERS AND JORDAN VALLEY AROUND 515 PM EDT...
  NEW TRIPOLI AROUND 520 PM EDT...
  CLAUSSVILLE AROUND 535 PM EDT...
  KUTZTOWN AROUND 540 PM EDT...
  TOPTON AND LYONS AROUND 550 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.

&&

LAT...LON 4094 7582 4050 7540 4043 7551 4044 7553
      4038 7558 4035 7564 4058 7604 4065 7600
      4074 7578 4084 7594 4090 7600 4092 7599
      4096 7588 4096 7585
TIME...MOT...LOC 2039Z 332DEG 19KT 4085 7590

$$
 
TFG

2 follow-up statements

474 
WWUS51 KPHI 012109
SVSPHI

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
509 PM EDT MON AUG 1 2011

PAC011-025-077-012200-
/O.CON.KPHI.SV.W.0222.000000T0000Z-110801T2200Z/
BERKS PA-LEHIGH PA-CARBON PA-
509 PM EDT MON AUG 1 2011

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 600 PM EDT
FOR SOUTH CENTRAL CARBON...LEHIGH AND NORTHEASTERN BERKS COUNTIES...

AT 504 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 NEW MAHONING...OR 8 MILES SOUTHWEST OF LEHIGHTON...
MOVING SOUTH AT 15 MPH.

THE SEVERE THUNDERSTORM WILL BE NEAR...
  JORDAN VALLEY BY 525 PM EDT...
  WANAMAKERS AND NEW TRIPOLI BY 530 PM EDT...
  6 MILES EAST OF LENHARTSVILLE BY 550 PM EDT...
  6 MILES WEST OF CLAUSSVILLE BY 555 PM EDT...
  KUTZTOWN...TOPTON...6 MILES NORTH OF LYONS AND 8 MILES NORTH OF
  FLEETWOOD BY 600 PM EDT...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THIS STORM HAS DOWNED TREES IN WESTERN CARBON 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 4059 7602 4065 7600 4074 7578 4079 7586
      4083 7583 4085 7578 4081 7575 4050 7540
      4043 7551 4044 7553 4035 7564 4058 7604
TIME...MOT...LOC 2108Z 340DEG 13KT 4074 7584

$$

TFG

547 
WWUS51 KPHI 012121
SVSPHI

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
521 PM EDT MON AUG 1 2011

PAC011-025-077-012131-
/O.CAN.KPHI.SV.W.0222.000000T0000Z-110801T2200Z/
BERKS PA-LEHIGH PA-CARBON PA-
521 PM EDT MON AUG 1 2011

...THE SEVERE THUNDERSTORM WARNING FOR SOUTH CENTRAL CARBON...LEHIGH
AND NORTHEASTERN BERKS COUNTIES IS CANCELLED...

THE THUNDERSTORMS HAVE WEAKENED TO BELOW SEVERE LIMITS.

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 4059 7602 4065 7600 4074 7578 4079 7586
      4083 7583 4085 7578 4081 7575 4050 7540
      4043 7551 4044 7553 4035 7564 4058 7604
TIME...MOT...LOC 2121Z 340DEG 13KT 4070 7582

$$
 
TFG

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 31, 10:00 PM EDT	Special Weather Statement	PHI	Chester	60 min
Aug 1, 1:35 PM EDT	Special Weather Statement	PHI	Carbon, Lehigh, Monroe, Northampton	3 hr
Aug 1, 3:14 PM EDT	Severe Thunderstorm Warning	PHI	Carbon, Monroe	51 min
Aug 1, 3:46 PM EDT	Special Weather Statement	PHI	Berks	89 min
Aug 1, 4:00 PM EDT	Severe Thunderstorm Warning	PHI	Berks	75 min
Aug 1, 4:33 PM EDT	Severe Thunderstorm Warning	PHI	Berks, Chester, Delaware, Montgomery, Philadelphia	87 min
Aug 1, 5:11 PM EDT	Areal Flood Advisory	PHI	Chester, Delaware, Montgomery, Philadelphia	2 hr
Aug 1, 5:37 PM EDT	Severe Thunderstorm Warning	PHI	Chester, Delaware, Philadelphia	53 min
Aug 1, 5:50 PM EDT	Severe Thunderstorm Warning	PHI	Philadelphia	70 min
Aug 1, 6:17 PM EDT	Areal Flood Advisory	PHI	Delaware, Philadelphia	3 hr
Aug 1, 6:20 PM EDT	Severe Thunderstorm Warning	PHI	Chester, Delaware	46 min

Nearby

Severe Thunderstorm Warnings in Pennsylvania, 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.