Alert archive / New Jersey / Severe Thunderstorm Warnings in 2013

Severe Thunderstorm Warning 112, NWS Philadelphia/Mount Holly

October 7, 2013Hunterdon County, New Jersey; Bucks County, Pennsylvania

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Oct 7, 2013, 1:59 PM EDT for Hunterdon County, New Jersey; Bucks County, Pennsylvania. It was in force for 46 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: Oct 7, 2013, 1:59 PM EDT (17:59 UTC)
Expired: Oct 7, 2013, 2:45 PM EDT
In force: 46 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon

Counties Hunterdon County, NJ, Bucks County, PA

The radar

The Philadelphia radar (KDIX), 77 km from the middle of the area, began a volume at 17:59 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
Oct 7, 2:15 PM EDT	TSTM WND DMG	Solebury Twp, PA	TREES DOWN
Oct 7, 2:15 PM EDT	TSTM WND DMG	Solebury Twp, PA	TREES UPROOTED AND SOME TREES DOWN ON HOMES.

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
Oct 7, 8:56 AM EDT	Tornado Watch	SPC	8 hr

The nearest sounding before it

Phillips Aaf/Abe, MD (KAPG), launched 12:00Z, 6.0 hours before the alert went out and 154 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: 114 J/kg
Mixed-layer CIN: -7 J/kg
Mixed-layer LCL: 584 m above ground
0-6 km bulk shear: 48 kt
0-1 km storm-relative helicity: 149 m²/s²
0-3 km storm-relative helicity: 196 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.2

Open this sounding in Storm Lab

The text

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

717 
WUUS51 KPHI 071759
SVRPHI
NJC019-PAC017-071845-
/O.NEW.KPHI.SV.W.0112.131007T1759Z-131007T1845Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
159 PM EDT MON OCT 7 2013

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  HUNTERDON COUNTY IN NORTHWEST NEW JERSEY...
  CENTRAL BUCKS COUNTY IN SOUTHEAST PENNSYLVANIA...

* UNTIL 245 PM EDT

* AT 155 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  LINE OF SEVERE THUNDERSTORMS. THESE SEVERE STORMS EXTENDED FROM
  ALPHA TO BRITTANY FARMS-HIGHLANDS...MOVING NORTHEAST AT 45 MPH.
  THESE STORMS ARE CAPABLE OF PRODUCING DAMAGING WINDS IN EXCESS OF
  60 MPH. 

* SEVERE THUNDERSTORMS WILL BE NEAR...
  LUMBERVILLE AND ERWINNA AROUND 205 PM EDT...
  GLEN GARDNER AND STOCKTON AROUND 215 PM EDT...
  FLEMINGTON AND CALIFON AROUND 220 PM EDT...
  LEBANON AROUND 225 PM EDT...
  WHITE HOUSE STATION AROUND 230 PM EDT...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A TORNADO WATCH REMAINS IN EFFECT FOR THE WARNED AREA. IF A TORNADO
IS SPOTTED...ACT QUICKLY AND MOVE TO A PLACE OF SAFETY INSIDE A
STRONG BUILDING...SUCH AS A BASEMENT OR SMALL INTERIOR ROOM.

DOPPLER RADAR HAS INDICATED SOME 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 ON THE LOWEST
FLOOR.

&&

LAT...LON 4051 7478 4051 7479 4042 7480 4041 7481
      4023 7517 4024 7519 4060 7518 4062 7516
      4076 7484 4074 7483 4073 7475
TIME...MOT...LOC 1759Z 236DEG 38KT 4065 7510 4029 7514

$$

SZATKOWSKI

2 follow-up statements

912 
WWUS51 KPHI 071819
SVSPHI

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
219 PM EDT MON OCT 7 2013

PAC017-071829-
/O.CAN.KPHI.SV.W.0112.000000T0000Z-131007T1845Z/
BUCKS PA-
219 PM EDT MON OCT 7 2013

...THE SEVERE THUNDERSTORM WARNING FOR CENTRAL BUCKS COUNTY IS
CANCELLED...

THE STORM THAT PROMPTED THE SEVERE THUNDERSTORM WARNING HAS MOVED OUT
OF THE AREA...THEREFORE THE SEVERE THUNDERSTORM WARNING HAS BEEN
CANCELLED.

LAT...LON 4042 7480 4034 7495 4056 7500 4070 7496
      4076 7485 4074 7483 4073 7475
TIME...MOT...LOC 1819Z 242DEG 45KT 4072 7486 4039 7486

$$

NJC019-071845-
/O.CON.KPHI.SV.W.0112.000000T0000Z-131007T1845Z/
HUNTERDON NJ-
219 PM EDT MON OCT 7 2013

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 245 PM EDT
FOR EASTERN HUNTERDON COUNTY...

AT 215 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING DAMAGING
WINDS IN EXCESS OF 60 MPH. THESE STORMS WERE LOCATED ALONG A LINE
EXTENDING FROM GLEN GARDNER TO LAMBERTVILLE...MOVING NORTHEAST AT 50
MPH.

SEVERE THUNDERSTORMS WILL BE NEAR...
WHITE HOUSE STATION AROUND 225 PM EDT...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A TORNADO WATCH REMAINS IN EFFECT FOR THE WARNED AREA. 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.

DOPPLER RADAR HAS INDICATED SOME ROTATION WITHIN THIS STORM. WHILE
NOT IMMEDIATELY LIKELY...A TORNADO MAY 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 4042 7480 4034 7495 4056 7500 4070 7496
      4076 7485 4074 7483 4073 7475
TIME...MOT...LOC 1819Z 242DEG 45KT 4072 7486 4039 7486

$$

FORECASTER:  DRAG

899 
WWUS51 KPHI 071838
SVSPHI

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
238 PM EDT MON OCT 7 2013

NJC019-071847-
/O.EXP.KPHI.SV.W.0112.000000T0000Z-131007T1845Z/
HUNTERDON NJ-
238 PM EDT MON OCT 7 2013

...THE SEVERE THUNDERSTORM WARNING FOR EASTERN HUNTERDON COUNTY WILL
EXPIRE AT 245 PM EDT...

THE SEVERE THUNDERSTORM WARNING WILL BE ALLOWED TO EXPIRE.

THE LINE OF STORMS HAS JUST MOVED OUT OF THE WARNING AREA AND THE 
THREAT FOR DAMAGING WIND HAS DIMINISHED IN HUNTERDON COUNTY. 

LAT...LON 4042 7480 4034 7495 4056 7500 4070 7496
      4076 7485 4074 7483 4073 7475
TIME...MOT...LOC 1837Z 242DEG 45KT 4083 7460 4050 7460

$$

FORECASTER:  DRAG

The office that day

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

Issued	Product	Office	Counties	Lasted
Oct 7, 1:30 PM EDT	Special Weather Statement	PHI	Hunterdon, Morris, Sussex, Warren	60 min
Oct 7, 1:37 PM EDT	Special Weather Statement	PHI	Salem	53 min
Oct 7, 2:24 PM EDT	Special Weather Statement	PHI	Morris, Somerset	51 min
Oct 7, 2:33 PM EDT	Special Weather Statement	PHI	Mercer, Middlesex	42 min
Oct 7, 3:02 PM EDT	Special Weather Statement	PHI	Mercer, Middlesex	43 min
Oct 7, 3:49 PM EDT	Special Marine Warning	PHI		56 min
Oct 7, 4:05 PM EDT	Special Weather Statement	PHI	Monmouth, Ocean	40 min
Oct 7, 11:31 AM EDT	Special Weather Statement	PHI	Berks, Chester	59 min
Oct 7, 11:50 AM EDT	Severe Thunderstorm Warning	PHI	Berks	40 min
Oct 7, 12:12 PM EDT	Severe Thunderstorm Warning	PHI	Berks, Carbon, Lehigh, Monroe, Northampton	63 min
Oct 7, 12:41 PM EDT	Special Weather Statement	PHI	Chester	64 min
Oct 7, 12:49 PM EDT	Severe Thunderstorm Warning	PHI	Berks, Chester, Montgomery	41 min
Oct 7, 1:05 PM EDT	Severe Thunderstorm Warning	PHI	Chester, Delaware	25 min
Oct 7, 1:33 PM EDT	Special Weather Statement	PHI	Bucks, Montgomery	42 min

Nearby

Severe Thunderstorm Warnings in New Jersey, 2013 Severe Thunderstorm Warnings in Pennsylvania, 2013 Every severe thunderstorm warning in 2013

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.