Alert archive / New Jersey / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 23, NWS Philadelphia/Mount Holly

April 27, 2011Morris County, Somerset County, Sussex County, New Jersey

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Apr 27, 2011, 3:39 PM EDT for Morris County, Somerset County, Sussex County, New Jersey. It was in force for 66 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
Apr 27, 2011, 3:39 PM EDT (19:39 UTC)
Expired
Apr 27, 2011, 4:45 PM EDT
In force
66 min
Issued by
NWS Philadelphia/Mount Holly
Area
Storm-based polygon

Counties Morris County, NJ, Somerset County, NJ, Sussex County, NJ

The radar

The Philadelphia radar (KDIX), 109 km from the middle of the area, began a volume at 19:42 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

TimeReportWhereRemark
Apr 27, 3:51 PM EDTTSTM WND DMGRandolph Twp, NJA FEW TREES DOWN IN THE COUNTY.

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, 7.7 hours before the alert went out and 130 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-pSkew-T log-p diagram, Brookhaven, NY at 12:00Z on 2011-04-27Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Brookhaven, NY at 12:00Z on 2011-04-27The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 78 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
582 m above ground
0-6 km bulk shear
30 kt
0-1 km storm-relative helicity
78 m²/s²
0-3 km storm-relative helicity
116 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.

370 
WUUS51 KPHI 271939
SVRPHI
NJC027-035-037-272045-
/O.NEW.KPHI.SV.W.0023.110427T1939Z-110427T2045Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
339 PM EDT WED APR 27 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...
  NORTHEASTERN SOMERSET COUNTY IN NORTHERN NEW JERSEY...
  EASTERN SUSSEX COUNTY IN NORTHWEST NEW JERSEY...

* UNTIL 445 PM EDT

* AT 338 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
  A SEVERE THUNDERSTORM CAPABLE OF PRODUCING DAMAGING WINDS UP
  TO 60 MPH.  THIS STORM WAS LOCATED NEAR PEAPACK AND
  GLADSTONE...OR   9 MILES SOUTHWEST OF MORRISTOWN...AND MOVING NORTH 
  AT 45 MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  MENDHAM AROUND 345 PM EDT...
  SUCCASUNNA AND MORRIS PLAINS AROUND 350 PM EDT...
  DOVER...WHARTON...ROCKAWAY AND MOUNT ARLINGTON AROUND 355 PM EDT...
  LAKE TELEMARK AROUND 405 PM EDT...
  GREEN POND AROUND 410 PM EDT...
  HIGHLAND LAKE AROUND 425 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.

&&

LAT...LON 4119 7437 4109 7449 4104 7449 4105 7444
      4102 7442 4101 7432 4097 7427 4089 7427
      4089 7433 4086 7431 4078 7437 4075 7436
      4067 7445 4065 7443 4061 7447 4071 7471
      4126 7456
TIME...MOT...LOC 1939Z 198DEG 38KT 4073 7463

$$
 
TFG
2 follow-up statements
986 
WWUS51 KPHI 271948
SVSPHI

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
348 PM EDT WED APR 27 2011

NJC035-271957-
/O.CAN.KPHI.SV.W.0023.000000T0000Z-110427T2045Z/
SOMERSET NJ-
348 PM EDT WED APR 27 2011

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

THE SEVERE THUNDERSTORM IS NOW IN MORRIS COUNTY.

LAT...LON 4119 7437 4109 7449 4104 7449 4105 7444
      4102 7442 4101 7432 4097 7427 4089 7427
      4089 7433 4086 7431 4078 7437 4075 7436
      4070 7452 4074 7456 4073 7463 4075 7468
      4126 7456
TIME...MOT...LOC 1947Z 198DEG 38KT 4081 7459

$$

NJC027-037-272045-
/O.CON.KPHI.SV.W.0023.000000T0000Z-110427T2045Z/
SUSSEX NJ-MORRIS NJ-
348 PM EDT WED APR 27 2011

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 445 PM EDT
FOR MORRIS AND EASTERN SUSSEX COUNTIES...

AT 342 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A SEVERE THUNDERSTORM CAPABLE OF NOW PRODUCING AROUND
QUARTER SIZE HAIL...AND DAMAGING WINDS UP TO 60 MPH.  THIS STORM WAS
LOCATED NEAR MENDHAM...OR 7 MILES WEST OF MORRISTOWN...MOVING NORTH
AT 45 MPH.

THE SEVERE THUNDERSTORM WILL BE NEAR...
  DOVER...VICTORY GARDENS...WHARTON AND ROCKAWAY BY 355 PM EDT...
  WHITE MEADOW LAKE BY 400 PM EDT...
  LAKE TELEMARK BY 405 PM EDT...
  GREEN POND AND 6 MILES EAST OF OGDENSBURG BY 410 PM EDT...
  HIGHLAND LAKE BY 425 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.

&&

LAT...LON 4119 7437 4109 7449 4104 7449 4105 7444
      4102 7442 4101 7432 4097 7427 4089 7427
      4089 7433 4086 7431 4078 7437 4075 7436
      4070 7452 4074 7456 4073 7463 4075 7468
      4126 7456
TIME...MOT...LOC 1947Z 198DEG 38KT 4081 7459

$$
 
TFG
491 
WWUS51 KPHI 272029
SVSPHI

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
429 PM EDT WED APR 27 2011

NJC027-272038-
/O.CAN.KPHI.SV.W.0023.000000T0000Z-110427T2045Z/
MORRIS NJ-
429 PM EDT WED APR 27 2011

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

THE SEVERE THUNDERSTORM IS NOW IN SUSSEX COUNTY.

LAT...LON 4126 7456 4125 7454 4119 7437 4111 7447
      4109 7448 4109 7449 4111 7449 4113 7452
TIME...MOT...LOC 2028Z 198DEG 38KT 4122 7441

$$

NJC037-272045-
/O.CON.KPHI.SV.W.0023.000000T0000Z-110427T2045Z/
SUSSEX NJ-
429 PM EDT WED APR 27 2011

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 445 PM EDT
FOR EAST CENTRAL SUSSEX COUNTY...

AT 425 PM EDT...A SEVERE THUNDERSTORM WAS REPORTED CAPABLE OF
PRODUCING DAMAGING WINDS OF AROUND 60 MPH.  THIS STORM WAS LOCATED
NEAR HIGHLAND LAKE...OR 20 MILES NORTHEAST OF NEWTON...MOVING NORTH
AT 45 MPH.

IF YOU SEE THREATENING WEATHER, HEAD INDOORS QUICKLY.

LAT...LON 4126 7456 4125 7454 4119 7437 4111 7447
      4109 7448 4109 7449 4111 7449 4113 7452
TIME...MOT...LOC 2028Z 198DEG 38KT 4122 7441

$$
 

TFG

The office that day

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

IssuedProductOfficeCountiesLasted
Apr 26, 9:25 PM EDTMarine Dense Fog AdvisoryPHI6 hr
Apr 27, 12:08 AM EDTSpecial Weather StatementPHIMorris, Sussex, Warren67 min
Apr 27, 12:34 AM EDTSevere Thunderstorm WarningPHIMorris, Sussex, Warren56 min
Apr 27, 12:43 AM EDTSpecial Weather StatementPHIHunterdon, Somerset62 min
Apr 27, 1:19 AM EDTSpecial Weather StatementPHIHunterdon, Mercer, Middlesex, Somerset56 min
Apr 27, 3:25 AM EDTSpecial Weather StatementPHIHunterdon, Morris65 min
Apr 27, 3:30 AM EDTFlood WatchPHIMercer, Middlesex, Morris, Somerset12 hr
Apr 27, 2:31 PM EDTSevere Thunderstorm WarningPHIBurlington, Camden, Gloucester44 min
Apr 27, 3:26 PM EDTFlash Flood WatchPHIHunterdon, Mercer, Middlesex, Morris, Somerset, Sussex and 1 more24 hr
Apr 27, 3:29 PM EDTSpecial Weather StatementPHIMorris, Somerset61 min
Apr 27, 4:16 PM EDTSpecial Weather StatementPHISalem59 min
Apr 27, 4:43 PM EDTSpecial Weather StatementPHICamden, Cumberland, Gloucester, Salem62 min
Apr 27, 4:43 PM EDTSevere Thunderstorm WarningPHICumberland, Gloucester, Salem36 min
Apr 27, 4:50 PM EDTSpecial Marine WarningPHI12 min
Apr 27, 5:22 PM EDTSpecial Weather StatementPHIBurlington, Camden, Gloucester83 min

Nearby

Severe Thunderstorm Warnings in New Jersey, 2011Every 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.