Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 179, NWS Philadelphia/Mount Holly

August 9, 2012Berks County, Pennsylvania

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Aug 9, 2012, 2:13 PM EDT for Berks County, Pennsylvania. It was in force for 77 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: Aug 9, 2012, 2:13 PM EDT (18:13 UTC)
Expired: Aug 9, 2012, 3:30 PM EDT
In force: 77 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon

County Berks County, PA

The radar

The Philadelphia radar (KDIX), 124 km from the middle of the area, began a volume at 18:15 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, 6.2 hours before the alert went out and 98 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.

744 
WUUS51 KPHI 091813
SVRPHI
PAC011-091930-
/O.NEW.KPHI.SV.W.0179.120809T1813Z-120809T1930Z/

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

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  SOUTHEASTERN BERKS COUNTY IN EASTERN PENNSYLVANIA...
  THIS INCLUDES THE CITY OF READING...

* UNTIL 330 PM EDT

* AT 211 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 9 MILES
  WEST OF NEW MORGAN...OR 12 MILES SOUTHWEST OF READING...AND MOVING
  NORTHEAST AT 15 MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  NEW MORGAN AROUND 245 PM EDT...
  6 MILES SOUTHEAST OF READING AROUND 255 PM EDT...
  BIRDSBORO AROUND 305 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.

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 4046 7572 4034 7561 4024 7570 4014 7588
      4027 7608
TIME...MOT...LOC 1813Z 240DEG 13KT 4019 7604

$$

HEAVENER

1 follow-up statement

374 
WWUS51 KPHI 091849
SVSPHI

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

PAC011-091930-
/O.CON.KPHI.SV.W.0179.000000T0000Z-120809T1930Z/
BERKS PA-
249 PM EDT THU AUG 9 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 330 PM EDT
FOR SOUTHEASTERN BERKS COUNTY...

AT 245 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 MORGAN...OR 6 MILES SOUTH OF READING...MOVING
NORTHEAST AT 15 MPH.

THE SEVERE THUNDERSTORM WILL BE NEAR...
  BIRDSBORO BY 305 PM EDT...
  AMITY GARDENS BY 320 PM EDT...
  BOYERTOWN BY 330 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 4039 7566 4034 7561 4024 7570 4014 7588
      4021 7600
TIME...MOT...LOC 1849Z 240DEG 13KT 4025 7589

$$

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, 2:20 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, 7:10 PM EDT	Severe Thunderstorm Warning	PHI	Berks, Carbon, Lehigh	80 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.