Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2015

Severe Thunderstorm Warning 105, NWS Philadelphia/Mount Holly

August 4, 20155 counties in Pennsylvania

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Aug 4, 2015, 1:54 AM EDT for 5 counties in Pennsylvania. It was in force for 50 min. 1 report 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: Aug 4, 2015, 1:54 AM EDT (05:54 UTC)
Expired: Aug 4, 2015, 2:44 AM EDT
In force: 50 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon

Counties Berks County, PA, Carbon County, PA, Lehigh County, PA, Monroe County, PA, Northampton County, PA

The radar

The Philadelphia radar (KDIX), 132 km from the middle of the area, began a volume at 05:53 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
Aug 4, 2:09 AM EDT	TSTM WND DMG	1 E Mill Creek Corner, PA	NUMEROUS TREES DOWN NEAR I-78 ALONG THE BERKS/LEHIGH COUNTY BORDER

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 00:00Z, 5.9 hours before the alert went out and 231 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: 1050 J/kg
Mixed-layer CIN: -55 J/kg
Mixed-layer LCL: 1110 m above ground
0-6 km bulk shear: 26 kt
0-1 km storm-relative helicity: 123 m²/s²
0-3 km storm-relative helicity: 173 m²/s²
Significant tornado parameter: 0.4
Supercell composite: 4.5

Open this sounding in Storm Lab

The text

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

690 
WUUS51 KPHI 040554
SVRPHI
PAC011-025-077-089-095-040700-
/O.NEW.KPHI.SV.W.0105.150804T0554Z-150804T0700Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
154 AM EDT TUE AUG 4 2015

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ  HAS ISSUED A

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

* UNTIL 300 AM EDT

* AT 153 AM EDT...DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM
  CAPABLE OF PRODUCING QUARTER SIZE HAIL AND DAMAGING WINDS IN EXCESS
  OF 60 MPH. THIS STORM WAS LOCATED OVER HAMBURG...OR 11 MILES EAST
  OF SCHUYLKILL HAVEN...AND MOVING EAST AT 50 MPH.

* LOCATIONS IMPACTED INCLUDE...
  ALLENTOWN...EASTON...LEHIGHTON...BETHLEHEM...FORKS...NORTHAMPTON...
  WILSON...NAZARETH...PALMERTON...KUTZTOWN...SLATINGTON...WIND GAP...
  BATH...WALNUTPORT...BELFAST...WEST EASTON...TATAMY...STEUBEN...
  GLENDON AND LENHARTSVILLE.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

SEVERE THUNDERSTORMS PRODUCE DAMAGING WINDS...LARGE HAIL...DEADLY
LIGHTNING AND VERY HEAVY RAIN. FOR YOUR PROTECTION...MOVE TO AN
INTERIOR ROOM ON THE LOWEST FLOOR OF YOUR HOME OR BUSINESS. HEAVY
RAINS FLOOD ROADS QUICKLY SO DO NOT DRIVE INTO AREAS WHERE WATER
COVERS THE ROAD.

IN ADDITION TO LARGE HAIL AND 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.

TORRENTIAL RAINFALL IS ALSO OCCURRING WITH THIS STORM...AND MAY LEAD
TO FLASH FLOODING. DO NOT DRIVE YOUR VEHICLE THROUGH FLOODED
ROADWAYS.

&&

LAT...LON 4070 7583 4074 7576 4079 7584 4095 7534
      4072 7519 4068 7520 4068 7517 4047 7589
      4064 7598
TIME...MOT...LOC 0553Z 248DEG 43KT 4059 7596 

$$

HEAVENER

3 follow-up statements

050 
WWUS51 KPHI 040619
SVSPHI

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
219 AM EDT TUE AUG 4 2015

PAC011-040628-
/O.CAN.KPHI.SV.W.0105.000000T0000Z-150804T0700Z/
BERKS PA-
219 AM EDT TUE AUG 4 2015

...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN BERKS COUNTY IS
CANCELLED...
    
THE SEVERE THUNDERSTORM WHICH PROMPTED THE WARNING HAS MOVED OUT OF 
THE WARNED AREA. THEREFORE THE WARNING HAS BEEN CANCELLED.

LAT...LON 4069 7585 4070 7584 4070 7583 4074 7576
      4079 7584 4095 7534 4072 7519 4068 7520
      4068 7517 4054 7565
TIME...MOT...LOC 0618Z 248DEG 43KT 4071 7558 

$$

PAC025-077-089-095-040700-
/O.CON.KPHI.SV.W.0105.000000T0000Z-150804T0700Z/
CARBON PA-NORTHAMPTON PA-MONROE PA-LEHIGH PA-
219 AM EDT TUE AUG 4 2015

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 300 AM EDT
FOR SOUTHEASTERN CARBON...CENTRAL NORTHAMPTON...SOUTH CENTRAL MONROE
AND LEHIGH COUNTIES...

AT 218 AM EDT...DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM CAPABLE
OF PRODUCING QUARTER SIZE HAIL AND DAMAGING WINDS IN EXCESS OF 60
MPH. THIS STORM WAS LOCATED OVER NEFFS...OR 9 MILES NORTHWEST OF
ALLENTOWN...MOVING EAST AT 50 MPH.

LOCATIONS IMPACTED INCLUDE...
ALLENTOWN...EASTON...LEHIGHTON...BETHLEHEM...FORKS...NORTHAMPTON...
WILSON...NAZARETH...PALMERTON...SLATINGTON...WIND GAP...BATH...
WALNUTPORT...BELFAST...WEST EASTON...TATAMY...STEUBEN...GLENDON...NEW
TRIPOLI AND BEERSVILLE.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

SEVERE THUNDERSTORMS PRODUCE DAMAGING WINDS...DESTRUCTIVE HAIL...
DEADLY LIGHTNING AND VERY HEAVY RAIN. FOR YOUR PROTECTION MOVE TO AN
INTERIOR ROOM ON THE LOWEST FLOOR OF YOUR HOME OR BUSINESS. HEAVY
RAINS FLOOD ROADS QUICKLY SO DO NOT DRIVE INTO AREAS WHERE WATER
COVERS THE ROAD.

IF YOU ARE IN THE PATH OF THIS STORM...PREPARE IMMEDIATELY FOR LARGE
HAIL AND DAMAGING WINDS. PEOPLE OUTSIDE SHOULD MOVE TO A SHELTER...
PREFERABLY INSIDE A STRONG BUILDING AND AWAY FROM WINDOWS.

TORRENTIAL RAINFALL IS ALSO OCCURRING WITH THIS STORM...AND MAY LEAD
TO FLASH FLOODING. DO NOT DRIVE YOUR VEHICLE THROUGH FLOODED
ROADWAYS.

&&

LAT...LON 4069 7585 4070 7584 4070 7583 4074 7576
      4079 7584 4095 7534 4072 7519 4068 7520
      4068 7517 4054 7565
TIME...MOT...LOC 0618Z 248DEG 43KT 4071 7558 

$$

HEAVENER

034 
WWUS51 KPHI 040633
SVSPHI

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
233 AM EDT TUE AUG 4 2015

PAC025-040643-
/O.CAN.KPHI.SV.W.0105.000000T0000Z-150804T0700Z/
CARBON PA-
233 AM EDT TUE AUG 4 2015

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN CARBON COUNTY IS
CANCELLED...
    
THE SEVERE THUNDERSTORM WHICH PROMPTED THE WARNING HAS MOVED OUT OF 
THE WARNED AREA. THEREFORE THE WARNING HAS BEEN CANCELLED.

LAT...LON 4072 7519 4068 7520 4068 7517 4057 7555
      4077 7559 4080 7549 4088 7529
TIME...MOT...LOC 0633Z 248DEG 43KT 4077 7540 

$$

PAC077-089-095-040700-
/O.CON.KPHI.SV.W.0105.000000T0000Z-150804T0700Z/
NORTHAMPTON PA-MONROE PA-LEHIGH PA-
233 AM EDT TUE AUG 4 2015

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 300 AM EDT
FOR CENTRAL NORTHAMPTON...SOUTH CENTRAL MONROE AND NORTHEASTERN
LEHIGH COUNTIES...

AT 233 AM EDT...DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM CAPABLE
OF PRODUCING QUARTER SIZE HAIL AND DAMAGING WINDS IN EXCESS OF 60
MPH. THIS STORM WAS LOCATED OVER BATH...OR 10 MILES NORTHWEST OF
EASTON. THIS STORM WAS NEARLY STATIONARY.

LOCATIONS IMPACTED INCLUDE...
ALLENTOWN...EASTON...BETHLEHEM...FORKS...NORTHAMPTON...WILSON...
NAZARETH...WIND GAP...BATH...BELFAST...WEST EASTON...TATAMY...
STEUBEN...GLENDON...BEERSVILLE...BERLINSVILLE...OLD ORCHARD...
PHILLIPSBURG...CATASAUQUA AND COPLAY.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

SEVERE THUNDERSTORMS PRODUCE DAMAGING WINDS...DESTRUCTIVE HAIL...
DEADLY LIGHTNING AND VERY HEAVY RAIN. FOR YOUR PROTECTION MOVE TO AN
INTERIOR ROOM ON THE LOWEST FLOOR OF YOUR HOME OR BUSINESS. HEAVY
RAINS FLOOD ROADS QUICKLY SO DO NOT DRIVE INTO AREAS WHERE WATER
COVERS THE ROAD.

IF YOU ARE IN THE PATH OF THIS STORM...PREPARE IMMEDIATELY FOR LARGE
HAIL AND DAMAGING WINDS. PEOPLE OUTSIDE SHOULD MOVE TO A SHELTER...
PREFERABLY INSIDE A STRONG BUILDING AND AWAY FROM WINDOWS.

TORRENTIAL RAINFALL IS ALSO OCCURRING WITH THIS STORM...AND MAY LEAD
TO FLASH FLOODING. DO NOT DRIVE YOUR VEHICLE THROUGH FLOODED
ROADWAYS.

&&

LAT...LON 4072 7519 4068 7520 4068 7517 4057 7555
      4077 7559 4080 7549 4088 7529
TIME...MOT...LOC 0633Z 248DEG 43KT 4077 7540 

$$

HEAVENER

382 
WWUS51 KPHI 040644
SVSPHI

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
244 AM EDT TUE AUG 4 2015

PAC077-089-095-040653-
/O.CAN.KPHI.SV.W.0105.000000T0000Z-150804T0700Z/
NORTHAMPTON PA-MONROE PA-LEHIGH PA-
244 AM EDT TUE AUG 4 2015

...THE SEVERE THUNDERSTORM WARNING FOR CENTRAL NORTHAMPTON...SOUTH
CENTRAL MONROE AND NORTHEASTERN LEHIGH COUNTIES IS CANCELLED...
                
THE STORM WHICH PROMPTED THE WARNING HAS WEAKENED BELOW SEVERE
LIMITS...AND NO LONGER POSES AN IMMEDIATE THREAT TO LIFE OR PROPERTY.
THEREFORE THE WARNING HAS BEEN CANCELLED.

LAT...LON 4072 7519 4068 7520 4068 7517 4057 7555
      4077 7559 4080 7549 4088 7529
TIME...MOT...LOC 0641Z 248DEG 43KT 4082 7524 

$$

HEAVENER

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 4, 12:06 AM EDT	Special Weather Statement	PHI	Chester	54 min
Aug 4, 12:45 AM EDT	Special Weather Statement	PHI	Bucks, Chester, Montgomery, Philadelphia	60 min
Aug 4, 1:23 AM EDT	Special Weather Statement	PHI	Berks	37 min
Aug 4, 1:31 AM EDT	Severe Thunderstorm Warning	PHI	Berks	44 min
Aug 4, 1:42 AM EDT	Special Weather Statement	PHI	Carbon	48 min
Aug 4, 2:07 AM EDT	Special Weather Statement	PHI	Bucks	53 min
Aug 4, 2:56 AM EDT	Special Weather Statement	PHI	Bucks	64 min
Aug 4, 4:12 AM EDT	Special Weather Statement	PHI	Chester, Delaware	63 min
Aug 4, 4:20 AM EDT	Severe Thunderstorm Warning	PHI	Chester, Delaware	33 min

Nearby

Severe Thunderstorm Warnings in Pennsylvania, 2015 Every severe thunderstorm warning in 2015

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.