Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 177, NWS Philadelphia/Mount Holly

August 9, 2012Bucks County, Montgomery County, Pennsylvania

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Aug 9, 2012, 1:22 PM EDT for Bucks County, Montgomery County, Pennsylvania. It was in force for 68 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, 1:22 PM EDT (17:22 UTC)
Expired: Aug 9, 2012, 2:30 PM EDT
In force: 68 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon

Counties Bucks County, PA, Montgomery County, PA

The radar

The Philadelphia radar (KDIX), 100 km from the middle of the area, began a volume at 17:26 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, 5.4 hours before the alert went out and 124 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.

624 
WUUS51 KPHI 091722
SVRPHI
PAC017-091-091830-
/O.NEW.KPHI.SV.W.0177.120809T1722Z-120809T1830Z/

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

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTHWESTERN BUCKS COUNTY IN SOUTHEAST PENNSYLVANIA...
  NORTH CENTRAL MONTGOMERY COUNTY IN SOUTHEAST PENNSYLVANIA...

* UNTIL 230 PM EDT

* AT 121 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
  GREEN LANE...OR 17 MILES SOUTH OF ALLENTOWN...AND MOVING EAST AT 15
  MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  GERYVILLE AROUND 130 PM EDT...
  SOUDERTON AROUND 155 PM EDT...
  QUAKERTOWN AROUND 200 PM EDT...
  PERKASIE AROUND 205 PM EDT...
  DUBLIN AROUND 225 PM EDT...
  BEDMINSTER AROUND 230 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 4058 7524 4031 7511 4026 7555 4037 7559
      4044 7553 4042 7548 4048 7542 4053 7536
TIME...MOT...LOC 1723Z 256DEG 12KT 4035 7548

$$

HEAVENER

3 follow-up statements

383 
WWUS51 KPHI 091747
SVSPHI

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

PAC017-091-091830-
/O.CON.KPHI.SV.W.0177.000000T0000Z-120809T1830Z/
BUCKS PA-MONTGOMERY PA-
147 PM EDT THU AUG 9 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 230 PM EDT
FOR NORTH CENTRAL MONTGOMERY AND NORTHWESTERN BUCKS COUNTIES...

AT 143 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 TRUMBAUERSVILLE...OR 16 MILES SOUTH OF ALLENTOWN...
MOVING EAST AT 15 MPH.

THE SEVERE THUNDERSTORM WILL BE NEAR...
  TELFORD AND SOUDERTON BY 155 PM EDT...
  SELLERSVILLE AND QUAKERTOWN BY 200 PM EDT...
  PERKASIE AND 6 MILES SOUTH OF RICHLANDTOWN BY 205 PM EDT...
  SILVERDALE BY 210 PM EDT...
  DUBLIN BY 225 PM EDT...
  BEDMINSTER AND ROBESONIA BY 230 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 4032 7512 4028 7550 4038 7554 4043 7547
      4050 7540 4050 7539 4055 7532 4058 7524
TIME...MOT...LOC 1747Z 256DEG 12KT 4037 7538

$$

HEAVENER

050 
WWUS51 KPHI 091753
SVSPHI

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

PAC091-091803-
/O.CAN.KPHI.SV.W.0177.000000T0000Z-120809T1830Z/
MONTGOMERY PA-
153 PM EDT THU AUG 9 2012

...THE SEVERE THUNDERSTORM WARNING FOR NORTH CENTRAL MONTGOMERY
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 4040 7516 4037 7528 4050 7539 4055 7532
      4058 7524
TIME...MOT...LOC 1753Z 256DEG 12KT 4037 7535

$$

PAC017-091830-
/O.CON.KPHI.SV.W.0177.000000T0000Z-120809T1830Z/
BUCKS PA-
153 PM EDT THU AUG 9 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 230 PM EDT
FOR NORTHWESTERN BUCKS COUNTY...

AT 151 PM EDT...A SEVERE THUNDERSTORM WAS REPORTED CAPABLE OF
PRODUCING QUARTER SIZE HAIL...AND DAMAGING WINDS IN EXCESS OF 60 MPH.
 THIS STORM WAS LOCATED 7 MILES SOUTH OF RICHLANDTOWN...OR 16 MILES
SOUTH OF ALLENTOWN...MOVING EAST AT 15 MPH.

THE SEVERE THUNDERSTORM WILL BE NEAR...
  6 MILES SOUTH OF RICHLANDTOWN BY 205 PM EDT...
  9 MILES SOUTH OF PLEASANT VALLEY BY 215 PM EDT...
  BEDMINSTER BY 230 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 4040 7516 4037 7528 4050 7539 4055 7532
      4058 7524
TIME...MOT...LOC 1753Z 256DEG 12KT 4037 7535

$$

HEAVENER

429 
WWUS51 KPHI 091821
SVSPHI

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

PAC017-091832-
/O.EXP.KPHI.SV.W.0177.000000T0000Z-120809T1830Z/
BUCKS PA-
221 PM EDT THU AUG 9 2012

...THE SEVERE THUNDERSTORM WARNING FOR NORTHWESTERN BUCKS COUNTY WILL
EXPIRE AT 230 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 4040 7516 4037 7528 4050 7539 4055 7532
      4058 7524
TIME...MOT...LOC 1822Z 256DEG 12KT 4039 7523

$$

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, 1:26 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, 7:10 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.