Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2014

Severe Thunderstorm Warning 48, NWS Philadelphia/Mount Holly

June 13, 2014Lehigh County, Northampton County, Pennsylvania

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Jun 13, 2014, 2:42 PM EDT for Lehigh County, Northampton County, Pennsylvania. It was in force for 63 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: Jun 13, 2014, 2:42 PM EDT (18:42 UTC)
Expired: Jun 13, 2014, 3:45 PM EDT
In force: 63 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon

Counties Lehigh County, PA, Northampton County, PA

The radar

The Philadelphia radar (KDIX), 111 km from the middle of the area, began a volume at 18:41 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
Jun 13, 2:53 PM EDT	TSTM WND GST 54	S Allentown, PA
Jun 13, 2:55 PM EDT	TSTM WND DMG	Allentown, PA	TREE AND WIRES DOWN IN ALLENTOWN.
Jun 13, 3:20 PM EDT	TSTM WND GST 57	Forks Twp, PA

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

The nearest sounding before it

Brookhaven, NY (KOKX), launched 12:00Z, 6.7 hours before the alert went out and 205 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.

011 
WUUS51 KPHI 131842
SVRPHI
PAC077-095-131945-
/O.NEW.KPHI.SV.W.0048.140613T1842Z-140613T1945Z/

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

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  LEHIGH COUNTY IN EASTERN PENNSYLVANIA...
  NORTHAMPTON COUNTY IN EASTERN PENNSYLVANIA...

* UNTIL 345 PM EDT

* AT 237 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM. THE STORM WAS NEAR ANCIENT OAKS...MOVING
  NORTHEAST AT 30 MPH. THIS STORM IS CAPABLE OF PRODUCING DAMAGING
  WINDS IN EXCESS OF 60 MPH. 

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  ALLENTOWN AROUND 250 PM EDT...
  NORTHAMPTON AROUND 255 PM EDT...
  LEHIGH UNIVERSITY AROUND 300 PM EDT...
  BETHLEHEM AND HELLERTOWN AROUND 305 PM EDT...
  STEUBEN AND BATH AROUND 310 PM EDT...
  OLD ORCHARD AROUND 315 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 4077 7514 4078 7516 4075 7520 4073 7518
      4069 7520 4067 7518 4066 7520 4061 7520
      4046 7556 4054 7567 4060 7572 4087 7518
TIME...MOT...LOC 1842Z 240DEG 25KT 4057 7555

$$
 
TFG

2 follow-up statements

761 
WWUS51 KPHI 131907
SVSPHI

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

PAC077-095-131945-
/O.CON.KPHI.SV.W.0048.000000T0000Z-140613T1945Z/
LEHIGH PA-NORTHAMPTON PA-
307 PM EDT FRI JUN 13 2014

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 345 PM EDT
FOR NORTHAMPTON AND EAST CENTRAL LEHIGH COUNTIES...

AT 259 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A SEVERE THUNDERSTORM CAPABLE OF PRODUCING DAMAGING WINDS IN
EXCESS OF 60 MPH.  THIS STORM WAS LOCATED NEAR ALLENTOWN...MOVING
NORTHEAST AT 30 MPH. A SKYWARN SPOTTER JUST MEASURED A WIND GUST
OF 54 MPH IN ALLENTOWN.

THE SEVERE THUNDERSTORM WILL BE NEAR...
  BETHLEHEM...FREEMANSBURG AND HELLERTOWN BY 310 PM EDT...
  STEUBEN AND BATH BY 315 PM EDT...
  OLD ORCHARD BY 320 PM EDT...
  PALMER HEIGHTS...WILSON...GLENDON AND NAZARETH BY 325 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.

IN ADDITION TO DAMAGING WINDS...FREQUENT CLOUD TO
GROUND LIGHTNING IS OCCURRING WITH THIS STORM. MOVE INDOORS
IMMEDIATELY. REMEMBER...IF YOU CAN HEAR THUNDER...YOU ARE CLOSE
ENOUGH TO BE STRUCK BY LIGHTNING.

LAT...LON 4078 7514 4078 7517 4075 7520 4073 7518
      4069 7520 4067 7518 4066 7520 4061 7520
      4052 7547 4057 7555 4066 7557 4087 7518
TIME...MOT...LOC 1903Z 240DEG 25KT 4062 7543

$$

TFG

733 
WWUS51 KPHI 131923
SVSPHI

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

PAC077-131933-
/O.CAN.KPHI.SV.W.0048.000000T0000Z-140613T1945Z/
LEHIGH PA-
323 PM EDT FRI JUN 13 2014

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

THE STORM HAS MOVED EAST OF THE COUNTY.
 
LAT...LON 4078 7514 4078 7517 4075 7520 4073 7518
      4069 7520 4067 7518 4066 7520 4062 7520
      4058 7529 4065 7534 4073 7534 4087 7518
TIME...MOT...LOC 1923Z 240DEG 25KT 4069 7527

$$

PAC095-131945-
/O.CON.KPHI.SV.W.0048.000000T0000Z-140613T1945Z/
NORTHAMPTON PA-
323 PM EDT FRI JUN 13 2014

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 345 PM EDT
FOR EASTERN NORTHAMPTON COUNTY...

AT 320 PM EDT...A SEVERE THUNDERSTORM WAS REPORTED CAPABLE OF
PRODUCING DAMAGING WINDS TO 60 MPH.  THIS STORM WAS LOCATED
NEAR PALMER HEIGHTS...OR NEAR EASTON...MOVING NORTHEAST AT 30 MPH.

THE SEVERE THUNDERSTORM WILL BE NEAR...
  FORKS...EASTON...TATAMY AND STOCKERTOWN BY 330 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.

LAT...LON 4078 7514 4078 7517 4075 7520 4073 7518
      4069 7520 4067 7518 4066 7520 4062 7520
      4058 7529 4065 7534 4073 7534 4087 7518
TIME...MOT...LOC 1923Z 240DEG 25KT 4069 7527

$$

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, 2:34 PM EDT	Severe Thunderstorm Warning	PHI	Berks, Bucks, Lehigh, Montgomery	48 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.