Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2014

Severe Thunderstorm Warning 47, NWS Philadelphia/Mount Holly

June 13, 20144 counties in Pennsylvania

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Jun 13, 2014, 2:34 PM EDT for 4 counties in Pennsylvania. It was in force for 48 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: Jun 13, 2014, 2:34 PM EDT (18:34 UTC)
Expired: Jun 13, 2014, 3:22 PM EDT
In force: 48 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon

Counties Berks County, PA, Bucks County, PA, Lehigh County, PA, Montgomery County, PA

The radar

The Philadelphia radar (KDIX), 103 km from the middle of the area, began a volume at 18:37 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

Brookhaven, NY (KOKX), launched 12:00Z, 6.6 hours before the alert went out and 219 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: 101 J/kg
Mixed-layer CIN: -44 J/kg
Mixed-layer LCL: 502 m above ground
0-6 km bulk shear: 17 kt
0-1 km storm-relative helicity: 66 m²/s²
0-3 km storm-relative helicity: 112 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.7

Open this sounding in Storm Lab

The text

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

245 
WUUS51 KPHI 131834
SVRPHI
PAC011-017-077-091-131930-
/O.NEW.KPHI.SV.W.0047.140613T1834Z-140613T1930Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
234 PM EDT FRI JUN 13 2014

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  EAST CENTRAL BERKS COUNTY IN EASTERN PENNSYLVANIA...
  NORTHWESTERN BUCKS COUNTY IN SOUTHEAST PENNSYLVANIA...
  SOUTHEASTERN LEHIGH COUNTY IN EASTERN PENNSYLVANIA...
  NORTHWESTERN MONTGOMERY COUNTY IN SOUTHEAST PENNSYLVANIA...

* UNTIL 330 PM EDT

* AT 233 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM. THE STORM WAS NEAR PENNSBURG...MOVING
  NORTHEAST AT 15 MPH. THIS STORM IS CAPABLE OF PRODUCING QUARTER
  SIZE HAIL...AND DAMAGING WINDS IN EXCESS OF 60 MPH. 

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  EAST GREENVILLE AROUND 240 PM EDT...
  GERYVILLE AROUND 245 PM EDT...
  ZIONSVILLE AROUND 250 PM EDT...
  PERKASIE AROUND 305 PM EDT...
  QUAKERTOWN AND PERKASIE AROUND 310 PM EDT...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THIS IS A DANGEROUS STORM. IF YOU ARE IN ITS PATH...MOVE INDOORS TO A
STURDY BUILDING AND STAY AWAY FROM WINDOWS. WHEN IT IS SAFE TO DO
SO...REPORT SEVERE WEATHER TO LOCAL LAW ENFORCEMENT OR TO THE
NATIONAL WEATHER SERVICE.

VERY HEAVY RAIN WILL ALSO OCCUR WITH THIS SEVERE THUNDERSTORM...WHICH
COULD FLOOD LOW LYING AREAS QUICKLY AND COVER ROADS WITH WATER. DO
NOT DRIVE INTO AREAS WHERE WATER COVERS THE ROAD.

&&

LAT...LON 4058 7541 4054 7534 4054 7533 4039 7518
      4029 7556 4040 7566
TIME...MOT...LOC 1834Z 238DEG 15KT 4038 7551

$$
 
TFG

2 follow-up statements

164 
WWUS51 KPHI 131853
SVSPHI

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
253 PM EDT FRI JUN 13 2014

PAC011-131902-
/O.CAN.KPHI.SV.W.0047.000000T0000Z-140613T1930Z/
BERKS PA-
253 PM EDT FRI JUN 13 2014

...THE SEVERE THUNDERSTORM WARNING FOR EAST CENTRAL BERKS COUNTY IS
CANCELLED...

THE STORM HAS MOVED EAST OF THE COUNTY.
 
LAT...LON 4058 7541 4054 7533 4039 7518 4032 7542
      4032 7544 4040 7552
TIME...MOT...LOC 1852Z 238DEG 15KT 4042 7543

$$

PAC017-077-091-131930-
/O.CON.KPHI.SV.W.0047.000000T0000Z-140613T1930Z/
BUCKS PA-LEHIGH PA-MONTGOMERY PA-
253 PM EDT FRI JUN 13 2014

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 330 PM EDT
FOR NORTH CENTRAL MONTGOMERY...SOUTHEASTERN LEHIGH AND WEST CENTRAL
BUCKS COUNTIES...

AT 250 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A SEVERE THUNDERSTORM CAPABLE OF PRODUCING DAMAGING
WINDS IN EXCESS OF 60 MPH AS WELL AS HAIL AS LARGE AS QUARTERS. 
THIS STORM WAS LOCATED NEAR GERYVILLE...OR 12 MILES SOUTH OF 
ALLENTOWN...MOVING NORTHEAST AT 15 MPH.

THE GUST FRONT FROM THIS THUNDERSTORM IS STILL MOVING THROUGH
NORTHEASTERN MONTGOMERY COUNTY.

THE SEVERE THUNDERSTORM WILL BE NEAR...
  TRUMBAUERSVILLE BY 300 PM EDT...
  6 MILES NORTHWEST OF PERKASIE AND 7 MILES NORTHWEST OF SELLERSVILLE
  BY 305 PM EDT...
  QUAKERTOWN AND COOPERSBURG BY 310 PM EDT...
  RICHLANDTOWN BY 315 PM EDT...

THIS IS A DANGEROUS STORM. IF YOU ARE IN ITS PATH...MOVE INDOORS TO A
STURDY BUILDING AND STAY AWAY FROM WINDOWS. WHEN IT IS SAFE TO DO
SO...REPORT SEVERE WEATHER TO LOCAL LAW ENFORCEMENT OR TO THE
NATIONAL WEATHER SERVICE.

DOPPLER RADAR HAS INDICATED SOME WEAK ROTATION WITHIN THIS STORM.
WHILE NOT IMMEDIATELY LIKELY...A TORNADO MAY STILL DEVELOP. IF A
TORNADO IS SPOTTED...ACT QUICKLY AND MOVE TO A PLACE OF SAFETY IN A
STURDY STRUCTURE...SUCH AS A BASEMENT OR SMALL INTERIOR ROOM.

LAT...LON 4058 7541 4054 7533 4039 7518 4032 7542
      4032 7544 4040 7552
TIME...MOT...LOC 1852Z 238DEG 15KT 4042 7543

$$

TFG

754 
WWUS51 KPHI 131922
SVSPHI

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
322 PM EDT FRI JUN 13 2014

PAC017-077-091-131931-
/O.CAN.KPHI.SV.W.0047.000000T0000Z-140613T1930Z/
BUCKS PA-LEHIGH PA-MONTGOMERY PA-
322 PM EDT FRI JUN 13 2014

...THE SEVERE THUNDERSTORM WARNING FOR NORTH CENTRAL MONTGOMERY...
SOUTHEASTERN LEHIGH AND WEST CENTRAL BUCKS COUNTIES IS CANCELLED...

THE STORM HAS WEAKENED AND MOVED EAST OF THE AREA AND WEAKENED.
 
LAT...LON 4058 7541 4054 7533 4039 7518 4032 7542
      4032 7544 4040 7552
TIME...MOT...LOC 1921Z 238DEG 15KT 4048 7529

$$

TFG

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 13, 3:25 AM EDT	Special Weather Statement	PHI	Bucks, Lehigh	65 min
Jun 13, 4:28 AM EDT	Special Weather Statement	PHI	Lehigh, Northampton	62 min
Jun 13, 4:46 AM EDT	Areal Flood Advisory	PHI	Berks, Chester, Lehigh, Montgomery	3 hr
Jun 13, 6:17 AM EDT	River Flood Warning	PHI	Chester	4 hr
Jun 13, 6:41 AM EDT	Areal Flood Warning	PHI	Berks, Bucks, Chester, Lehigh, Montgomery	15 hr
Jun 13, 11:54 AM EDT	Flash Flood Watch	PHI	Berks, Bucks, Carbon, Chester, Delaware, Lehigh and 4 more	11 hr
Jun 13, 12:36 PM EDT	Special Weather Statement	PHI	Berks	69 min
Jun 13, 1:25 PM EDT	Flash Flood Warning	PHI	Berks, Carbon, Lehigh, Monroe, Northampton	4 hr
Jun 13, 1:48 PM EDT	Flash Flood Warning	PHI	Berks, Bucks, Chester, Lehigh, Montgomery	4 hr
Jun 13, 1:48 PM EDT	Severe Thunderstorm Warning	PHI	Berks, Lehigh	57 min
Jun 13, 2:16 PM EDT	Special Weather Statement	PHI	Carbon, Chester, Lehigh, Monroe, Northampton	119 min
Jun 13, 2:42 PM EDT	Severe Thunderstorm Warning	PHI	Lehigh, Northampton	63 min
Jun 13, 2:52 PM EDT	Areal Flood Advisory	PHI	Bucks, Monroe, Northampton	4 hr
Jun 13, 3:14 PM EDT	Special Weather Statement	PHI	Bucks, Monroe, Montgomery, Northampton	2 hr
Jun 13, 3:16 PM EDT	Areal Flood Advisory	PHI	Bucks, Chester, Delaware, Montgomery, Philadelphia	4 hr
Jun 13, 3:38 PM EDT	Severe Thunderstorm Warning	PHI	Bucks, Northampton	52 min
Jun 13, 3:52 PM EDT	Special Weather Statement	PHI	Delaware, Philadelphia	53 min
Jun 13, 4:58 PM EDT	Severe Thunderstorm Warning	PHI	Philadelphia	23 min
Jun 13, 5:04 PM EDT	Areal Flood Advisory	PHI	Bucks	4 hr

Nearby

Severe Thunderstorm Warnings in Pennsylvania, 2014 Every severe thunderstorm warning in 2014

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.