Alert archive / New Jersey / Severe Thunderstorm Warnings in 2008

Severe Thunderstorm Warning 254, NWS Philadelphia/Mount Holly

August 15, 2008Morris County, New Jersey

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Aug 15, 2008, 4:27 PM EDT for Morris County, New Jersey. It was in force for 30 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: Aug 15, 2008, 4:27 PM EDT (20:27 UTC)
Expired: Aug 15, 2008, 4:57 PM EDT
In force: 30 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon

County Morris County, NJ

The radar

The Philadelphia radar (KDIX), 118 km from the middle of the area, began a volume at 20:30 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 15, 4:30 PM EDT	HAIL 0.88	Kinnelon, NJ	DIME TO NICKEL SIZE HAIL REPORTED IN KINNELON.
Aug 15, 4:38 PM EDT	HAIL 0.25	Butler, NJ	PEA SIZE HAIL REPORTED IN BUTLER.

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, 8.5 hours before the alert went out and 131 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: 192 J/kg
Mixed-layer CIN: -27 J/kg
Mixed-layer LCL: 694 m above ground
0-6 km bulk shear: 32 kt
0-1 km storm-relative helicity: 54 m²/s²
0-3 km storm-relative helicity: 91 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.

000 
WUUS51 KPHI 152027
SVRPHI
NJC027-152115-
/O.NEW.KPHI.SV.W.0254.080815T2027Z-080815T2115Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
427 PM EDT FRI AUG 15 2008

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTHEASTERN MORRIS COUNTY IN NORTHERN NEW JERSEY...

* UNTIL 515 PM EDT

* AT 426 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING NICKEL SIZE HAIL...AND
  DAMAGING WINDS IN EXCESS OF 60 MPH.  THIS STORM WAS LOCATED NEAR
  KINNELON...OR ABOUT 14 MILES NORTH OF MORRISTOWN...AND MOVING EAST
  AT 15 MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  KINNELON BY 435 PM...
  PEQUANNOCK TOWNSHIP BY 450 PM...

THUNDERSTORMS ARE CAPABLE OF PRODUCING HEAVY RAINFALL WHICH MAY
RESULT IN LOCALIZED AREAS OF FLOODING. DO NOT DRIVE IN AREAS WHERE
WATER IS CROSSING THE ROAD.

LAT...LON 4093 7449 4105 7452 4107 7449 4103 7449
      4105 7447 4105 7444 4102 7441 4101 7439
      4101 7435 4100 7430 4096 7427 4095 7427
TIME...MOT...LOC 2027Z 261DEG 13KT 4100 7443

$$

SZATKOWSKI

1 follow-up statement

000 
WWUS51 KPHI 152057
SVSPHI

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
457 PM EDT FRI AUG 15 2008

NJC027-152107-
/O.CAN.KPHI.SV.W.0254.000000T0000Z-080815T2115Z/
MORRIS NJ-
457 PM EDT FRI AUG 15 2008

...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN MORRIS COUNTY IS
CANCELLED...

THE SEVERE THUNDERSTORM HAS MOVED AWAY FROM THE AFFECTED AREA.

LAT...LON 4093 7449 4105 7452 4107 7449 4103 7449
      4105 7447 4105 7444 4102 7441 4101 7439
      4101 7435 4100 7430 4096 7427 4095 7427
TIME...MOT...LOC 2057Z 261DEG 13KT 4102 7429

$$

SZATKOWSKI

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 15, 3:16 PM EDT	Flash Flood Warning	PHI	Sussex	113 min
Aug 15, 3:16 PM EDT	Special Marine Warning	PHI		89 min
Aug 15, 6:01 PM EDT	Areal Flood Advisory	PHI	Somerset	119 min
Aug 15, 7:37 PM EDT	Areal Flood Advisory	PHI	Middlesex	113 min

Nearby

Severe Thunderstorm Warnings in New Jersey, 2008 Every severe thunderstorm warning in 2008

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.