Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 198, NWS Philadelphia/Mount Holly

July 25, 2011Berks County, Lehigh County, Pennsylvania

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Jul 25, 2011, 12:45 PM EDT for Berks County, Lehigh County, Pennsylvania. It was in force for 60 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Jul 25, 2011, 12:45 PM EDT (16:45 UTC)
Expired: Jul 25, 2011, 1:45 PM EDT
In force: 60 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon

Counties Berks County, PA, Lehigh County, PA

The radar

The Philadelphia radar (KDIX), 146 km from the middle of the area, began a volume at 16:45 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.

The nearest sounding before it

Phillips Aaf/Abe, MD (KAPG), launched 12:00Z, 4.8 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: 481 J/kg
Mixed-layer CIN: -66 J/kg
Mixed-layer LCL: 760 m above ground
0-6 km bulk shear: 18 kt
0-1 km storm-relative helicity: -6 m²/s²
0-3 km storm-relative helicity: 24 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.

341 
WUUS51 KPHI 251645
SVRPHI
PAC011-077-251745-
/O.NEW.KPHI.SV.W.0198.110725T1645Z-110725T1745Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
1245 PM EDT MON JUL 25 2011

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTHEASTERN BERKS COUNTY IN EASTERN PENNSYLVANIA...
  WESTERN LEHIGH COUNTY IN EASTERN PENNSYLVANIA...

* UNTIL 145 PM EDT

* AT 1241 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
  HAMBURG...OR 15 MILES NORTH OF READING...AND MOVING EAST AT 20 MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  LENHARTSVILLE AROUND 1255 PM EDT...
  KUTZTOWN AROUND 110 PM EDT...
  TOPTON AROUND 125 PM EDT...
  CLAUSSVILLE AROUND 135 PM EDT...
  ANCIENT OAKS AND 6 MILES SOUTH OF SCHNECKSVILLE AROUND 145 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 4060 7605 4059 7602 4064 7601 4073 7560
      4047 7553 4045 7601 4060 7606
TIME...MOT...LOC 1645Z 261DEG 15KT 4056 7593

$$

HEAVENER

3 follow-up statements

689 
WWUS51 KPHI 251709
SVSPHI

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
109 PM EDT MON JUL 25 2011

PAC011-077-251745-
/O.CON.KPHI.SV.W.0198.000000T0000Z-110725T1745Z/
BERKS PA-LEHIGH PA-
109 PM EDT MON JUL 25 2011

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 145 PM EDT
FOR SOUTHERN LEHIGH AND CENTRAL BERKS COUNTIES...

AT 106 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 LENHARTSVILLE...OR 18 MILES WEST OF ALLENTOWN...MOVING
EAST AT 15 MPH.

THE SEVERE THUNDERSTORM WILL BE NEAR...
  6 MILES NORTH OF TOPTON BY 125 PM EDT...
  6 MILES NORTH OF ALBURTIS BY 140 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 4055 7596 4059 7586 4062 7570 4047 7553
      4045 7601
TIME...MOT...LOC 1709Z 261DEG 15KT 4058 7580

$$

HEAVENER

433 
WWUS51 KPHI 251727
SVSPHI

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
127 PM EDT MON JUL 25 2011

PAC011-077-251745-
/O.CON.KPHI.SV.W.0198.000000T0000Z-110725T1745Z/
BERKS PA-LEHIGH PA-
127 PM EDT MON JUL 25 2011

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 145 PM EDT
FOR SOUTH CENTRAL LEHIGH AND CENTRAL BERKS COUNTIES...

AT 123 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 KUTZTOWN...OR 13 MILES WEST OF ALLENTOWN...MOVING EAST
AT 15 MPH.

THE SEVERE THUNDERSTORM WILL BE NEAR...
  6 MILES NORTH OF ALBURTIS BY 140 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 4055 7590 4057 7584 4059 7567 4047 7553
      4045 7593
TIME...MOT...LOC 1727Z 261DEG 15KT 4059 7570

$$

HEAVENER

889 
WWUS51 KPHI 251741
SVSPHI

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
141 PM EDT MON JUL 25 2011

PAC011-077-251750-
/O.EXP.KPHI.SV.W.0198.000000T0000Z-110725T1745Z/
BERKS PA-LEHIGH PA-
141 PM EDT MON JUL 25 2011

...THE SEVERE THUNDERSTORM WARNING FOR SOUTH CENTRAL LEHIGH AND
CENTRAL BERKS COUNTIES WILL EXPIRE AT 145 PM EDT...

THE STORM THAT PROMPTED THE WARNING HAS GREATLY WEAKENED, HOWEVER 
NUMEROUS LIGHTNING STRIKES AND TORRENTIAL RAINFALL WILL STILL OCCUR.

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 4055 7590 4057 7584 4059 7567 4047 7553
      4045 7593
TIME...MOT...LOC 1740Z 261DEG 15KT 4060 7563

$$

HEAVENER

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 24, 10:53 PM EDT	Special Weather Statement	PHI	Schuylkill	67 min
Jul 25, 6:19 AM EDT	Special Weather Statement	PHI	Monroe	56 min
Jul 25, 10:30 AM EDT	Special Weather Statement	PHI	Monroe	90 min
Jul 25, 11:51 AM EDT	Special Weather Statement	PHI	Berks	54 min
Jul 25, 11:58 AM EDT	Special Weather Statement	PHI	Carbon, Monroe	62 min
Jul 25, 12:19 PM EDT	Severe Thunderstorm Warning	PHI	Carbon, Monroe	56 min
Jul 25, 12:59 PM EDT	Areal Flood Advisory	PHI	Carbon	2 hr
Jul 25, 1:34 PM EDT	Special Weather Statement	PHI	Berks	56 min
Jul 25, 3:01 PM EDT	Special Weather Statement	PHI	Northampton	59 min
Jul 25, 4:25 PM EDT	Flash Flood Warning	PHI	Northampton	3 hr
Jul 25, 4:31 PM EDT	Areal Flood Advisory	PHI	Bucks, Northampton	3 hr
Jul 25, 5:18 PM EDT	Flash Flood Warning	PHI	Lehigh, Northampton	3 hr
Jul 25, 5:18 PM EDT	Special Weather Statement	PHI	Carbon, Monroe	57 min
Jul 25, 5:49 PM EDT	Areal Flood Advisory	PHI	Carbon, Monroe	93 min
Jul 25, 5:57 PM EDT	Special Weather Statement	PHI	Berks	63 min
Jul 25, 6:23 PM EDT	Areal Flood Advisory	PHI	Bucks, Chester, Delaware, Montgomery, Philadelphia	3 hr
Jul 25, 7:13 PM EDT	Special Weather Statement	PHI	Delaware	62 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.