Alert archive / New Jersey / Severe Thunderstorm Warnings in 2009

Severe Thunderstorm Warning 231, NWS Philadelphia/Mount Holly

September 11, 2009Monmouth County, New Jersey

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Sep 11, 2009, 8:46 AM EDT for Monmouth County, New Jersey. It was in force for 39 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Sep 11, 2009, 8:46 AM EDT (12:46 UTC)
Expired: Sep 11, 2009, 9:25 AM EDT
In force: 39 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon

County Monmouth County, NJ

The radar

The Philadelphia radar (KDIX), 34 km from the middle of the area, began a volume at 12:48 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.

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Sep 11, 4:12 AM EDT	Tornado Watch	SPC	8 hr

The nearest sounding before it

Brookhaven, NY (KOKX), launched 12:00Z, 0.8 hours before the alert went out and 137 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: 2 J/kg
Mixed-layer CIN: 0 J/kg
Mixed-layer LCL: 439 m above ground
0-6 km bulk shear: 20 kt
0-1 km storm-relative helicity: 329 m²/s²
0-3 km storm-relative helicity: 538 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 111246
SVRPHI
NJC025-111415-
/O.NEW.KPHI.SV.W.0231.090911T1246Z-090911T1415Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
846 AM EDT FRI SEP 11 2009

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  MONMOUTH COUNTY IN CENTRAL NEW JERSEY...

* UNTIL 1015 AM EDT

* AT 843 AM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING DAMAGING WINDS IN EXCESS
  OF 60 MPH.  THIS STORM WAS LOCATED NEAR ASBURY PARK...OR 14 MILES
  SOUTH OF SANDY HOOK...AND MOVING NORTHWEST AT 35 MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  LINCROFT...RED BANK AND 9 MILES NORTHEAST OF EAST FREEHOLD AROUND
  855 AM EDT...
  MIDDLETOWN...HOLMDEL AND 7 MILES NORTHEAST OF MARLBORO AROUND 900
  AM EDT...
  MATAWAN...KEANSBURG...MORGANVILLE AND 8 MILES NORTHEAST OF
  ROBERTSVILLE AROUND 905 AM EDT...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A TORNADO WATCH REMAINS IN EFFECT UNTIL NOON EDT FRIDAY FOR DELAWARE 
AND NEW JERSEY.

&&

LAT...LON 4027 7397 4012 7402 4009 7406 4013 7411
      4010 7416 4010 7424 4016 7427 4016 7443
      4008 7454 4011 7459 4017 7461 4017 7458
      4025 7448 4027 7441 4039 7425 4045 7422
      4045 7411 4041 7399 4036 7395
TIME...MOT...LOC 1246Z 142DEG 37KT 4027 7403

$$

JJM

1 follow-up statement

000 
WWUS51 KPHI 111325
SVSPHI

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
925 AM EDT FRI SEP 11 2009

NJC025-111333-
/O.CAN.KPHI.SV.W.0231.000000T0000Z-090911T1415Z/
MONMOUTH NJ-
925 AM EDT FRI SEP 11 2009

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

THUNDERSTORMS HAVE NOW EXITED THE COUNTY, SO THE SEVERE THUNDERSTORM 
WARNING HAS BEEN CANCELLED. HOWEVER, A WIND ADVISORY REMAINS IN 
EFFECT FOR MONMOUTH COUNTY UNTIL NOON FOR 50 TO 55 MPH GUSTS 
ASSOCIATED WITH A COASTAL LOW PRESSURE SYSTEM.

ALSO...A TORNADO WATCH REMAINS IN EFFECT UNTIL NOON EDT FRIDAY FOR 
DELAWARE AND NEW JERSEY.

LAT...LON 4027 7397 4012 7402 4009 7406 4013 7411
      4010 7416 4010 7424 4016 7427 4016 7443
      4008 7454 4011 7459 4017 7461 4017 7458
      4025 7448 4027 7441 4039 7425 4045 7422
      4045 7411 4041 7399 4036 7395
TIME...MOT...LOC 1323Z 142DEG 37KT 4057 7434

$$

JJM

The office that day

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

Issued	Product	Office	Counties	Lasted
Sep 11, 2:20 AM EDT	Special Marine Warning	PHI		85 min
Sep 11, 2:48 AM EDT	Severe Thunderstorm Warning	PHI	Cape May	72 min
Sep 11, 3:06 AM EDT	Flash Flood Warning	PHI	Cape May	4 hr
Sep 11, 3:07 AM EDT	Coastal Flood Advisory	PHI	Atlantic, Burlington, Cape May, Cumberland, Middlesex, Monmouth and 2 more	12 hr
Sep 11, 3:25 AM EDT	Special Marine Warning	PHI		95 min
Sep 11, 3:44 AM EDT	Special Marine Warning	PHI		95 min
Sep 11, 3:55 AM EDT	Severe Thunderstorm Warning	PHI	Cape May, Cumberland	65 min
Sep 11, 4:55 AM EDT	Severe Thunderstorm Warning	PHI	Cape May, Cumberland	65 min
Sep 11, 5:05 AM EDT	Special Marine Warning	PHI		115 min
Sep 11, 5:17 AM EDT	Special Marine Warning	PHI		88 min
Sep 11, 5:36 AM EDT	Severe Thunderstorm Warning	PHI	Atlantic, Cape May, Cumberland	69 min
Sep 11, 5:52 AM EDT	Severe Thunderstorm Warning	PHI	Atlantic, Cape May, Cumberland	53 min
Sep 11, 6:12 AM EDT	Areal Flood Advisory	PHI	Atlantic, Cape May, Cumberland	2 hr
Sep 11, 6:39 AM EDT	Special Marine Warning	PHI		96 min
Sep 11, 6:49 AM EDT	Severe Thunderstorm Warning	PHI	Atlantic, Cape May, Cumberland	86 min
Sep 11, 6:59 AM EDT	Flash Flood Warning	PHI	Cape May	3 hr
Sep 11, 8:18 AM EDT	Areal Flood Advisory	PHI	Atlantic, Cape May, Cumberland	117 min
Sep 11, 8:31 AM EDT	Areal Flood Advisory	PHI	Atlantic, Camden, Cumberland, Gloucester, Salem	119 min
Sep 11, 8:58 AM EDT	Coastal Flood Statement	PHI	Atlantic, Cape May, Monmouth, Ocean	35 hr
Sep 11, 9:02 AM EDT	Wind Advisory	PHI	Monmouth, Ocean	3 hr

Nearby

Severe Thunderstorm Warnings in New Jersey, 2009 Every severe thunderstorm warning in 2009

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.