Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 220, NWS Philadelphia/Mount Holly

August 1, 2011Berks County, Pennsylvania

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Aug 1, 2011, 4:00 PM EDT for Berks County, Pennsylvania. It was in force for 75 min. 3 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 1, 2011, 4:00 PM EDT (20:00 UTC)
Expired: Aug 1, 2011, 5:15 PM EDT
In force: 75 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon

County Berks County, PA

The radar

The Philadelphia radar (KDIX), 159 km from the middle of the area, began a volume at 20:00 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, 4:17 PM EDT	HAIL 0.25	Lower Alsace Twp, PA	PEA SIZE HAIL REPORTED IN LOWER ALSACE TWP.
Aug 1, 4:25 PM EDT	TSTM WND DMG	Oley, PA	TREE REPORTED DOWN IN OLEY.
Aug 1, 4:34 PM EDT	TSTM WND DMG	Tulpehocken Twp, PA	TREE REPORTED DOWN IN TULPEHOCKEN.

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, 8.0 hours before the alert went out and 113 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.

723 
WUUS51 KPHI 012000
SVRPHI
PAC011-012115-
/O.NEW.KPHI.SV.W.0220.110801T2000Z-110801T2115Z/

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

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...

* UNTIL 515 PM EDT

* AT 356 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
  STRAUSSTOWN...OR 18 MILES NORTHWEST OF READING...AND MOVING
  SOUTHEAST AT 25 MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  BERNVILLE AND WOMELSDORF AROUND 410 PM EDT...
  WERNERSVILLE AND 8 MILES SOUTHWEST OF LEESPORT AROUND 425 PM EDT...
  SINKING SPRING AROUND 430 PM EDT...
  WYOMISSING AND 6 MILES SOUTHWEST OF LAURELDALE AROUND 435 PM EDT...
  READING AROUND 440 PM EDT...
  BIRDSBORO AROUND 500 PM EDT...

THERE IS A SECOND SEVERE THUNDERSTORM IN CENTRAL SCHUYLKILL COUNTY
THAT COULD ALSO AFFECT BERKS COUNTY.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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 4053 7634 4052 7630 4054 7618 4060 7605
      4059 7603 4064 7601 4065 7598 4040 7557
      4016 7593 4036 7621 4036 7624 4047 7640
      4050 7644
TIME...MOT...LOC 1959Z 304DEG 21KT 4044 7622

$$

TFG

1 follow-up statement

604 
WWUS51 KPHI 012059
SVSPHI

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

PAC011-012115-
/O.CON.KPHI.SV.W.0220.000000T0000Z-110801T2115Z/
BERKS PA-
459 PM EDT MON AUG 1 2011

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 515 PM EDT
FOR SOUTHERN BERKS COUNTY...

AT 455 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 WERNERSVILLE...OR 9 MILES WEST OF READING...MOVING
SOUTHEAST AT 25 MPH.

THE SEVERE THUNDERSTORM WILL BE NEAR...
  MOHNTON...SHILLINGTON...7 MILES SOUTHWEST OF KENHORST AND 8 MILES
  SOUTHWEST OF READING BY 505 PM EDT...
  7 MILES SOUTHWEST OF FLYING HILLS BY 515 PM EDT...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THIS STORM HAS A HISTORY OF DOWNING TREES IN THE 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 4040 7610 4040 7601 4042 7593 4044 7592
      4046 7592 4047 7589 4047 7587 4035 7565
      4016 7593 4035 7617 4035 7619 4036 7617
      4039 7616
TIME...MOT...LOC 2059Z 321DEG 22KT 4028 7609

$$


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, 4:33 PM EDT	Severe Thunderstorm Warning	PHI	Berks, Chester, Delaware, Montgomery, Philadelphia	87 min
Aug 1, 4:39 PM EDT	Severe Thunderstorm Warning	PHI	Berks, Carbon, Lehigh	42 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.