Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2016

Severe Thunderstorm Warning 108, NWS Philadelphia/Mount Holly

July 18, 2016Carbon County, Lehigh County, Northampton County, Pennsylvania

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Jul 18, 2016, 2:28 PM EDT for Carbon County, Lehigh County, Northampton County, Pennsylvania. It was in force for 47 min. 5 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 18, 2016, 2:28 PM EDT (18:28 UTC)
Expired: Jul 18, 2016, 3:15 PM EDT
In force: 47 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon
Hail: 0.88 in
Wind: 60.0 mph

Counties Carbon County, PA, Lehigh County, PA, Northampton County, PA

The radar

The Philadelphia radar (KDIX), 142 km from the middle of the area, began a volume at 18:28 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 18, 2:58 PM EDT	TSTM WND DMG	Orefield, PA	TREES AND WIRES DOWN. TIME ESTIMATED FROM RADAR.
Jul 18, 3:00 PM EDT	TSTM WND DMG	Breinigsville, PA	WHEAT CROP DAMAGED. TIME ESTIMATED FROM RADAR.
Jul 18, 3:02 PM EDT	TSTM WND DMG	Trexlertown, PA	TREES DOWN ONTO WIRES. TIME ESTIMATED FROM RADAR.
Jul 18, 3:05 PM EDT	TSTM WND DMG	South Whitehall Twp, PA	TREES DOWN.
Jul 18, 3:05 PM EDT	TSTM WND DMG	Whitehall Twp, PA	TREES DOWN.

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 18, 12:05 PM EDT	Severe Thunderstorm Watch	SPC	8 hr

The nearest sounding before it

Washington/Dulle, VA (KIAD), launched 12:00Z, 6.5 hours before the alert went out and 239 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: 200 J/kg
Mixed-layer CIN: -105 J/kg
Mixed-layer LCL: 1480 m above ground
0-6 km bulk shear: 22 kt
0-1 km storm-relative helicity: 4 m²/s²
0-3 km storm-relative helicity: 18 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

569 
WUUS51 KPHI 181828
SVRPHI
PAC025-077-095-181915-
/O.NEW.KPHI.SV.W.0108.160718T1828Z-160718T1915Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
228 PM EDT MON JUL 18 2016

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ  HAS ISSUED A

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

* UNTIL 315 PM EDT

* AT 227 PM EDT...A SEVERE THUNDERSTORM WAS LOCATED NEAR JORDAN
  VALLEY...OR 7 MILES SOUTH OF LEHIGHTON...MOVING SOUTHEAST AT 30
  MPH.

  HAZARD...60 MPH WIND GUSTS AND NICKEL SIZE HAIL. 

  SOURCE...RADAR INDICATED. 

  IMPACT...EXPECT DAMAGE TO ROOFS...SIDING...AND TREES. 

* LOCATIONS IMPACTED INCLUDE...
  ALLENTOWN...NORTHAMPTON...SLATINGTON...WALNUTPORT...NEW TRIPOLI...
  NEW MAHONING...JORDAN VALLEY...CLAUSSVILLE...EMERALD...
  SCHNECKSVILLE...NEFFS...WANAMAKERS...ANCIENT OAKS...COFFEETOWN...
  CATASAUQUA...COPLAY...NORTH CATASAUQUA...ALBURTIS...
  HOKENDAUQUA AND FULLERTON.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

FOR YOUR PROTECTION MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF A
BUILDING.

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.

&&

LAT...LON 4069 7587 4070 7583 4074 7576 4078 7583
      4082 7581 4071 7538 4050 7561 4061 7580
      4068 7589
TIME...MOT...LOC 1827Z 294DEG 27KT 4073 7577 

HAIL...0.88IN
WIND...60MPH
 
$$

PO

1 follow-up statement

980 
WWUS51 KPHI 181852
SVSPHI

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
252 PM EDT MON JUL 18 2016

PAC025-181902-
/O.CAN.KPHI.SV.W.0108.000000T0000Z-160718T1915Z/
CARBON PA-
252 PM EDT MON JUL 18 2016

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

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 800 PM EDT FOR
EASTERN PENNSYLVANIA. A SEVERE THUNDERSTORM WATCH ALSO REMAINS IN
EFFECT UNTIL 800 PM EDT FOR EASTERN PENNSYLVANIA.

LAT...LON 4069 7575 4072 7572 4075 7564 4071 7538
      4050 7561 4061 7580 4065 7583
TIME...MOT...LOC 1852Z 294DEG 27KT 4065 7554 

$$

PAC077-095-181915-
/O.CON.KPHI.SV.W.0108.000000T0000Z-160718T1915Z/
NORTHAMPTON PA-LEHIGH PA-
252 PM EDT MON JUL 18 2016

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 315 PM EDT
FOR WEST CENTRAL NORTHAMPTON AND CENTRAL LEHIGH COUNTIES...

AT 252 PM EDT...A SEVERE THUNDERSTORM WAS LOCATED OVER
COFFEETOWN...OR
NEAR ALLENTOWN...MOVING SOUTHEAST AT 30 MPH.

HAZARD...60 MPH WIND GUSTS AND NICKEL SIZE HAIL. 

SOURCE...RADAR INDICATED. 

IMPACT...EXPECT DAMAGE TO ROOFS...SIDING...AND TREES. 

LOCATIONS IMPACTED INCLUDE...
ALLENTOWN...NORTHAMPTON...SLATINGTON...WALNUTPORT...NEW
TRIPOLI...JORDAN
VALLEY...CLAUSSVILLE...EMERALD...SCHNECKSVILLE...NEFFS...ANCIENT
OAKS...
COFFEETOWN...CATASAUQUA...COPLAY...NORTH CATASAUQUA...ALBURTIS...
HOKENDAUQUA AND FULLERTON.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

FOR YOUR PROTECTION MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF A
BUILDING.

&&

LAT...LON 4069 7575 4072 7572 4075 7564 4071 7538
      4050 7561 4061 7580 4065 7583
TIME...MOT...LOC 1852Z 294DEG 27KT 4065 7554 

HAIL...0.88IN
WIND...60MPH
 
$$

PO

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 18, 12:58 PM EDT	Special Weather Statement	PHI	Carbon	62 min
Jul 18, 1:48 PM EDT	Severe Thunderstorm Warning	PHI	Carbon, Monroe	57 min
Jul 18, 1:52 PM EDT	Special Weather Statement	PHI	Chester	38 min
Jul 18, 2:51 PM EDT	Severe Thunderstorm Warning	PHI	Berks, Bucks, Lehigh, Montgomery, Northampton	39 min
Jul 18, 3:17 PM EDT	Special Weather Statement	PHI	Delaware, Montgomery, Philadelphia	43 min
Jul 18, 3:25 PM EDT	Severe Thunderstorm Warning	PHI	Bucks	50 min
Jul 18, 3:41 PM EDT	Severe Thunderstorm Warning	PHI	Delaware, Montgomery, Philadelphia	49 min
Jul 18, 4:04 PM EDT	Special Weather Statement	PHI	Philadelphia	56 min

Nearby

Severe Thunderstorm Warnings in Pennsylvania, 2016 Every severe thunderstorm warning in 2016

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.