Alert archive / New Jersey / Severe Thunderstorm Warnings in 2013

Severe Thunderstorm Warning 30, NWS Philadelphia/Mount Holly

June 17, 2013Hunterdon County, Middlesex County, Somerset County, New Jersey

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Jun 17, 2013, 2:45 PM EDT for Hunterdon County, Middlesex County, Somerset County, New Jersey. It was in force for 60 min. 4 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 17, 2013, 2:45 PM EDT (18:45 UTC)
Expired: Jun 17, 2013, 3:45 PM EDT
In force: 60 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon

Counties Hunterdon County, NJ, Middlesex County, NJ, Somerset County, NJ

The radar

The Philadelphia radar (KDIX), 76 km from the middle of the area, began a volume at 18:48 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 17, 2:45 PM EDT	TSTM WND DMG	Clinton, NJ	TREES AND POWERLINES DOWN IN CLINTON... FRANKLIN... AND UNION TOWNSHIPS
Jun 17, 3:00 PM EDT	TSTM WND DMG	Readington Twp, NJ	HIGH WINDS BLEW DOWN TREES AND BRANCHES...SPRINGTOWN ROAD IS BLOCKED BY 10 INCH DIAMETER TREE BRANCH.
Jun 17, 3:20 PM EDT	HAIL 0.88	Stanton, NJ	WIND BREAKING OFF SMALL LIMBS.
Jun 17, 3:50 PM EDT	HAIL 0.25	Branchburg, NJ

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, 6.8 hours before the alert went out and 145 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: 137 J/kg
Mixed-layer CIN: -71 J/kg
Mixed-layer LCL: 1104 m above ground
0-6 km bulk shear: 47 kt
0-1 km storm-relative helicity: 66 m²/s²
0-3 km storm-relative helicity: 105 m²/s²
Significant tornado parameter: 0.0
Supercell composite: -0.0

Open this sounding in Storm Lab

The text

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

868 
WUUS51 KPHI 171845
SVRPHI
NJC019-023-035-171945-
/O.NEW.KPHI.SV.W.0030.130617T1845Z-130617T1945Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
245 PM EDT MON JUN 17 2013

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  CENTRAL HUNTERDON COUNTY IN NORTHWEST NEW JERSEY...
  SOMERSET COUNTY IN NORTHERN NEW JERSEY...
  NORTHERN MIDDLESEX COUNTY IN NORTHERN NEW JERSEY...

* UNTIL 345 PM EDT

* AT 238 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM. THE STORM WAS NEAR CLINTON...MOVING EAST AT 20
  MPH. THIS STORM IS CAPABLE OF PRODUCING QUARTER SIZE HAIL...AND
  DAMAGING WINDS IN EXCESS OF 60 MPH. 

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  LEBANON AROUND 255 PM EDT...
  WHITE HOUSE STATION AROUND 305 PM EDT...
  BRIDGEWATER AND FLAGTOWN AROUND 320 PM EDT...
  SOMERVILLE AND FAR HILLS AROUND 325 PM EDT...
  MANVILLE AND MILLSTONE AROUND 330 PM EDT...
  MARTINSVILLE AROUND 335 PM EDT...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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.

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 4043 7433 4054 7504 4070 7501 4071 7498
      4070 7452 4068 7453 4065 7452 4067 7446
      4066 7445 4067 7440 4062 7442 4060 7444
      4061 7431
TIME...MOT...LOC 1845Z 276DEG 19KT 4061 7490

$$

NIERENBERG

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 16, 8:15 PM EDT	Special Marine Warning	PHI		60 min
Jun 16, 8:51 PM EDT	Special Marine Warning	PHI		84 min
Jun 16, 10:38 PM EDT	Special Marine Warning	PHI		82 min
Jun 17, 2:37 PM EDT	Special Weather Statement	PHI	Hunterdon, Somerset	53 min
Jun 17, 3:25 PM EDT	Special Weather Statement	PHI	Hunterdon, Somerset	65 min
Jun 17, 4:06 PM EDT	Severe Thunderstorm Warning	PHI	Salem	69 min
Jun 17, 5:02 PM EDT	Special Weather Statement	PHI	Mercer	73 min
Jun 17, 5:14 PM EDT	Special Weather Statement	PHI	Gloucester	61 min
Jun 17, 5:48 PM EDT	Special Weather Statement	PHI	Monmouth	57 min
Jun 17, 5:55 PM EDT	Special Weather Statement	PHI	Salem	65 min
Jun 17, 6:05 PM EDT	Special Weather Statement	PHI	Atlantic, Salem	55 min
Jun 17, 6:29 PM EDT	Areal Flood Advisory	PHI	Salem	2 hr
Jun 17, 6:38 PM EDT	Severe Thunderstorm Warning	PHI	Atlantic, Cape May, Cumberland, Salem	67 min
Jun 17, 6:58 PM EDT	Special Weather Statement	PHI	Cumberland, Salem	92 min

Nearby

Severe Thunderstorm Warnings in New Jersey, 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.