Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2014

Severe Thunderstorm Warning 113, NWS Philadelphia/Mount Holly

July 9, 2014Lehigh County, Monroe County, Northampton County, Pennsylvania

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Jul 9, 2014, 5:42 PM EDT for Lehigh County, Monroe County, Northampton County, Pennsylvania. It was in force for 48 min. 2 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: Jul 9, 2014, 5:42 PM EDT (21:42 UTC)
Expired: Jul 9, 2014, 6:30 PM EDT
In force: 48 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon

Counties Lehigh County, PA, Monroe County, PA, Northampton County, PA

The radar

The Philadelphia radar (KDIX), 115 km from the middle of the area, began a volume at 21:45 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.

What was reported inside it

Time	Report	Where	Remark
Jul 9, 5:52 PM EDT	HAIL 1	Bath, PA	NICKEL TO QUARTER SIZE HAIL REPORTED IN BATH.
Jul 9, 5:53 PM EDT	HAIL 1.5	Moore Twp, PA	1.5 INCH HAIL IN MOORE TOWNSHIP.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Jul 9, 4:12 PM EDT	Severe Thunderstorm Watch	SPC	6 hr

The nearest sounding before it

Phillips Aaf/Abe, MD (KAPG), launched 12:00Z, 9.7 hours before the alert went out and 166 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: 159 J/kg
Mixed-layer CIN: -73 J/kg
Mixed-layer LCL: 1115 m above ground
0-6 km bulk shear: 44 kt
0-1 km storm-relative helicity: -24 m²/s²
0-3 km storm-relative helicity: 73 m²/s²
Significant tornado parameter: -0.0
Supercell composite: -0.6

Open this sounding in Storm Lab

The text

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

393 
WUUS51 KPHI 092142
SVRPHI
PAC077-089-095-092245-
/O.NEW.KPHI.SV.W.0113.140709T2142Z-140709T2245Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
542 PM EDT WED JUL 9 2014

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTHEASTERN LEHIGH COUNTY IN EASTERN PENNSYLVANIA...
  SOUTH CENTRAL MONROE COUNTY IN NORTHEAST PENNSYLVANIA...
  NORTHAMPTON COUNTY IN EASTERN PENNSYLVANIA...

* UNTIL 645 PM EDT

* AT 541 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  NEW SEVERE THUNDERSTORM. THE STORM WAS NEAR COPLAY...MOVING NORTHEAST
  AT 45 MPH. THIS STORM IS CAPABLE OF PRODUCING QUARTER SIZE HAIL...
  AND DAMAGING WINDS IN EXCESS OF 60 MPH. 

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  BEERSVILLE AND BATH AROUND 550 PM EDT...
  BELFAST AND NAZARETH AROUND 600 PM EDT...
  WIND GAP AROUND 605 PM EDT...
  PEN ARGYL AND BANGOR AROUND 610 PM EDT...
  EAST BANGOR AROUND 615 PM EDT...
  DELAWARE WATER GAP AROUND 620 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.

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 1000 PM EDT
WEDNESDAY EVENING FOR NORTHERN DELAWARE AND NORTHEAST MARYLAND AND
NEW JERSEY AND EASTERN PENNSYLVANIA.

&&

LAT...LON 4087 7505 4085 7507 4085 7509 4082 7509
      4080 7510 4077 7513 4078 7517 4075 7520
      4073 7518 4070 7521 4056 7555 4070 7570
      4098 7514
TIME...MOT...LOC 2142Z 231DEG 37KT 4069 7553

$$
 
TFG

3 follow-up statements

672 
WWUS51 KPHI 092159
SVSPHI

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
559 PM EDT WED JUL 9 2014

PAC077-092209-
/O.CAN.KPHI.SV.W.0113.000000T0000Z-140709T2245Z/
LEHIGH PA-
559 PM EDT WED JUL 9 2014

...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN LEHIGH COUNTY IS
CANCELLED...

THE SEVERE THUNDERSTORM IS NOW IN NORTHAMPTON COUNTY.

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 1000 PM EDT
WEDNESDAY EVENING FOR NORTHERN DELAWARE AND NORTHEAST MARYLAND AND
NEW JERSEY AND EASTERN PENNSYLVANIA.

LAT...LON 4087 7505 4085 7507 4085 7509 4080 7510
      4077 7513 4078 7517 4073 7522 4068 7537
      4077 7548 4090 7531 4098 7514
TIME...MOT...LOC 2159Z 240DEG 32KT 4075 7536

$$

PAC089-095-092245-
/O.CON.KPHI.SV.W.0113.000000T0000Z-140709T2245Z/
MONROE PA-NORTHAMPTON PA-
559 PM EDT WED JUL 9 2014

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 645 PM EDT
FOR NORTHERN NORTHAMPTON AND SOUTH CENTRAL MONROE COUNTIES...

AT 556 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE
HAIL...AND DAMAGING WINDS TO 60 MPH.  THIS STORM WAS
LOCATED NEAR BATH...OR 10 MILES WEST OF EASTON...MOVING NORTHEAST AT
35 MPH.

THE SEVERE THUNDERSTORM WILL BE NEAR...
  BELFAST...EASTLAWN GARDENS...STOCKERTOWN AND TATAMY BY 605 PM
  EDT...
  WIND GAP BY 610 PM EDT...
  BANGOR...ROSETO AND PEN ARGYL BY 615 PM EDT...
  EAST BANGOR BY 620 PM EDT...
  PORTLAND BY 625 PM EDT...

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.

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 1000 PM EDT
WEDNESDAY EVENING FOR NORTHERN DELAWARE AND NORTHEAST MARYLAND AND
NEW JERSEY AND EASTERN PENNSYLVANIA.

LAT...LON 4087 7505 4085 7507 4085 7509 4080 7510
      4077 7513 4078 7517 4073 7522 4068 7537
      4077 7548 4090 7531 4098 7514
TIME...MOT...LOC 2159Z 240DEG 32KT 4075 7536

$$

TFG

845 
WWUS51 KPHI 092214
SVSPHI

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
614 PM EDT WED JUL 9 2014

PAC089-092223-
/O.CAN.KPHI.SV.W.0113.000000T0000Z-140709T2245Z/
MONROE PA-
614 PM EDT WED JUL 9 2014

...THE SEVERE THUNDERSTORM WARNING FOR SOUTH CENTRAL MONROE COUNTY IS
CANCELLED...

THE SEVERE THUNDERSTORM IS IN NORTHAMPTON COUNTY.
 
LAT...LON 4096 7512 4089 7507 4087 7505 4085 7507
      4085 7509 4080 7510 4077 7513 4078 7519
      4080 7521 4085 7522 4089 7517
TIME...MOT...LOC 2213Z 240DEG 32KT 4082 7518

$$

PAC095-092245-
/O.CON.KPHI.SV.W.0113.000000T0000Z-140709T2245Z/
NORTHAMPTON PA-
614 PM EDT WED JUL 9 2014

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 645 PM EDT
FOR NORTHEASTERN NORTHAMPTON COUNTY...

AT 612 PM EDT...A SEVERE THUNDERSTORM WAS REPORTED CAPABLE OF
PRODUCING QUARTER SIZE HAIL.  THIS STORM WAS LOCATED 8 MILES
SOUTHWEST OF PORTLAND...OR 9 MILES NORTH OF EASTON...MOVING NORTHEAST
AT 35 MPH. WINDS TO AROUND 50 MPH ARE ALSO POSSIBLE WITH THIS STORM.

THE SEVERE THUNDERSTORM WILL BE NEAR...
  PORTLAND BY 625 PM EDT...

HAIL OF QUARTER SIZE AND GREATER HAS BEEN REPORTED WITH THIS STORM
IN WESTERN NORTHAMPTON COUNTY.
  
A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 1000 PM EDT
WEDNESDAY EVENING FOR NORTHERN DELAWARE AND NORTHEAST MARYLAND AND
NEW JERSEY AND EASTERN PENNSYLVANIA.

LAT...LON 4096 7512 4089 7507 4087 7505 4085 7507
      4085 7509 4080 7510 4077 7513 4078 7519
      4080 7521 4085 7522 4089 7517
TIME...MOT...LOC 2213Z 240DEG 32KT 4082 7518

$$ 
 
TFG

784 
WWUS51 KPHI 092230
SVSPHI

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
630 PM EDT WED JUL 9 2014

PAC095-092240-
/O.CAN.KPHI.SV.W.0113.000000T0000Z-140709T2245Z/
NORTHAMPTON PA-
630 PM EDT WED JUL 9 2014

...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN NORTHAMPTON
COUNTY IS CANCELLED...

THE SEVERE STORM IS IN SOUTHERN WARREN COUNTY.

LAT...LON 4096 7512 4089 7507 4087 7505 4085 7507
      4085 7509 4080 7510 4077 7513 4078 7519
      4080 7521 4085 7522 4089 7517
TIME...MOT...LOC 2230Z 240DEG 32KT 4089 7500

$$

TFG

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 8, 8:06 PM EDT	Severe Thunderstorm Warning	PHI	Delaware, Montgomery, Philadelphia	84 min
Jul 8, 8:25 PM EDT	Severe Thunderstorm Warning	PHI	Bucks, Lehigh, Northampton	59 min
Jul 8, 8:38 PM EDT	Severe Thunderstorm Warning	PHI	Berks, Chester	25 min
Jul 9, 2:04 PM EDT	Special Weather Statement	PHI	Lehigh	41 min
Jul 9, 2:40 PM EDT	Special Weather Statement	PHI	Lehigh	65 min
Jul 9, 2:48 PM EDT	Special Weather Statement	PHI	Monroe	72 min
Jul 9, 4:43 PM EDT	Special Weather Statement	PHI	Northampton	62 min
Jul 9, 5:07 PM EDT	Severe Thunderstorm Warning	PHI	Carbon, Monroe, Northampton	53 min
Jul 9, 5:28 PM EDT	Special Weather Statement	PHI	Berks, Lehigh, Northampton	92 min

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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.