Alert archive / New Jersey / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 91, NWS Philadelphia/Mount Holly

June 9, 2011Morris County, Sussex County, New Jersey

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Jun 9, 2011, 5:34 PM EDT for Morris County, Sussex County, New Jersey. It was in force for 41 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: Jun 9, 2011, 5:34 PM EDT (21:34 UTC)
Expired: Jun 9, 2011, 6:15 PM EDT
In force: 41 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon

Counties Morris County, NJ, Sussex County, NJ

The radar

The Philadelphia radar (KDIX), 114 km from the middle of the area, began a volume at 21:38 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 9, 6:00 PM EDT	TSTM WND DMG	Chester, NJ	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
Jun 9, 2:34 PM EDT	Severe Thunderstorm Watch	SPC	7 hr

The nearest sounding before it

Brookhaven, NY (KOKX), launched 12:00Z, 9.6 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: 1610 J/kg
Mixed-layer CIN: -193 J/kg
Mixed-layer LCL: 1424 m above ground
0-6 km bulk shear: 34 kt
0-1 km storm-relative helicity: 32 m²/s²
0-3 km storm-relative helicity: 98 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.1

Open this sounding in Storm Lab

The text

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

801 
WUUS51 KPHI 092134
SVRPHI
NJC027-037-092215-
/O.NEW.KPHI.SV.W.0091.110609T2134Z-110609T2215Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
534 PM EDT THU JUN 9 2011

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  MORRIS COUNTY IN NORTHERN NEW JERSEY...
  THIS INCLUDES THE CITY OF MORRISTOWN...
  SOUTHEASTERN SUSSEX COUNTY IN NORTHWEST NEW JERSEY...

* UNTIL 615 PM EDT

* AT 529 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE HAIL...AND
  DAMAGING WINDS IN EXCESS OF 60 MPH.  THIS STORM WAS LOCATED NEAR
  HIGHLAND LAKE...OR 17 MILES EAST OF NEWTON...AND MOVING SOUTHEAST
  AT 30 TO 35 MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  GREEN POND AROUND 540 PM EDT...
  KINNELON...BUTLER...RIVERDALE AND LAKE TELEMARK AROUND 545 PM
  EDT...
  PEQUANNOCK TOWNSHIP AROUND 550 PM EDT...
  BOONTON...MOUNTAIN LAKES AND LINCOLN PARK AROUND 555 PM EDT...
  PARSIPPANY AROUND 600 PM EDT...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THIS IS A DANGEROUS STORM. IF YOU ARE IN ITS PATH...PREPARE
IMMEDIATELY FOR DAMAGING WINDS...DESTRUCTIVE HAIL...AND DEADLY CLOUD
TO GROUND LIGHTNING. PEOPLE OUTSIDE SHOULD MOVE TO A SHELTER...
PREFERABLY INSIDE A STRONG BUILDING BUT AWAY FROM WINDOWS.

IN ADDITION TO LARGE HAIL AND DAMAGING WINDS...FREQUENT CLOUD TO 
GROUND LIGHTNING IS OCCURRING WITH THIS STORM. MOVE INDOORS 
IMMEDIATELY! LIGHTNING IS ONE OF NATURES GREATEST KILLERS. 
REMEMBER...IF YOU CAN HEAR THUNDER...YOU ARE CLOSE ENOUGH TO BE 
STRUCK BY LIGHTNING.

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 1000 PM EDT
THURSDAY EVENING FOR NORTHERN DELAWARE AND NORTHEAST MARYLAND AND NEW
JERSEY AND EASTERN PENNSYLVANIA.

&&

LAT...LON 4109 7449 4104 7449 4105 7444 4101 7439
      4100 7430 4096 7427 4092 7428 4089 7427
      4089 7433 4086 7431 4077 7437 4074 7471
      4114 7468 4119 7437
TIME...MOT...LOC 2133Z 345DEG 32KT 4108 7443

$$

1 follow-up statement

118 
WWUS51 KPHI 092151
SVSPHI

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
551 PM EDT THU JUN 9 2011

NJC027-037-092215-
/O.CON.KPHI.SV.W.0091.000000T0000Z-110609T2215Z/
SUSSEX NJ-MORRIS NJ-
551 PM EDT THU JUN 9 2011

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 615 PM EDT
FOR MORRIS AND SOUTHEASTERN SUSSEX COUNTIES...

AT 546 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE
HAIL...AND DAMAGING WINDS IN EXCESS OF 60 MPH.  THIS STORM WAS 
LOCATED NEAR KINNELON...OR 12 MILES WEST OF PATERSON...MOVING 
SOUTHEAST AT 35 MPH.

THE SEVERE THUNDERSTORM WILL BE NEAR...
  BOONTON...PARSIPPANY...MOUNTAIN LAKES AND LINCOLN PARK BY 555 PM
  EDT...
  HANOVER TOWNSHIP AND 7 MILES EAST OF MORRIS PLAINS BY 600 PM EDT...
  EAST HANOVER...FLORHAM PARK AND 8 MILES EAST OF MORRISTOWN BY 605
  PM EDT...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

IN ADDITION TO LARGE HAIL AND DAMAGING WINDS...FREQUENT CLOUD TO 
GROUND LIGHTNING IS OCCURRING WITH THIS STORM. MOVE INDOORS 
IMMEDIATELY! LIGHTNING IS ONE OF NATURES GREATEST KILLERS. 
REMEMBER...IF YOU CAN HEAR THUNDER...YOU ARE CLOSE ENOUGH TO BE 
STRUCK BY LIGHTNING.

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 1000 PM EDT
THURSDAY EVENING FOR NORTHERN DELAWARE AND NORTHEAST MARYLAND AND NEW
JERSEY AND EASTERN PENNSYLVANIA.

&&

LAT...LON 4109 7449 4104 7449 4105 7444 4101 7439
      4100 7430 4096 7427 4092 7428 4089 7427
      4089 7433 4086 7431 4077 7437 4074 7471
      4114 7468 4119 7437
TIME...MOT...LOC 2149Z 345DEG 32KT 4094 7438

$$

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 9, 3:33 PM EDT	Severe Thunderstorm Warning	PHI	Sussex	16 min
Jun 9, 4:41 PM EDT	Severe Thunderstorm Warning	PHI	Sussex	64 min
Jun 9, 5:43 PM EDT	Severe Thunderstorm Warning	PHI	Morris, Sussex, Warren	62 min
Jun 9, 6:44 PM EDT	Severe Thunderstorm Warning	PHI	Hunterdon, Morris, Somerset, Warren	61 min
Jun 9, 7:17 PM EDT	Special Weather Statement	PHI	Monmouth	43 min
Jun 9, 7:21 PM EDT	Severe Thunderstorm Warning	PHI	Middlesex, Monmouth	39 min
Jun 9, 7:42 PM EDT	Severe Thunderstorm Warning	PHI	Hunterdon, Mercer, Middlesex, Morris, Somerset	33 min
Jun 9, 7:46 PM EDT	Special Marine Warning	PHI		59 min
Jun 9, 7:57 PM EDT	Severe Thunderstorm Warning	PHI	Mercer, Middlesex, Monmouth	18 min

Nearby

Severe Thunderstorm Warnings in New Jersey, 2011 Every severe thunderstorm warning in 2011

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.