Alert archive / New Jersey / Severe Thunderstorm Warnings in 2009

Severe Thunderstorm Warning 159, NWS Philadelphia/Mount Holly

July 29, 2009Middlesex County, Monmouth County, New Jersey

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Jul 29, 2009, 7:31 PM EDT for Middlesex County, Monmouth County, New Jersey. It was in force for 30 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: Jul 29, 2009, 7:31 PM EDT (23:31 UTC)
Expired: Jul 29, 2009, 8:01 PM EDT
In force: 30 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon

Counties Middlesex County, NJ, Monmouth County, NJ

The radar

The Philadelphia radar (KDIX), 55 km from the middle of the area, began a volume at 23:34 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
Jul 29, 12:49 PM EDT	Severe Thunderstorm Watch	SPC	8 hr

The nearest sounding before it

Brookhaven, NY (KOKX), launched 12:00Z, 11.5 hours before the alert went out and 120 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: 594 J/kg
Mixed-layer CIN: -17 J/kg
Mixed-layer LCL: 646 m above ground
0-6 km bulk shear: 32 kt
0-1 km storm-relative helicity: 51 m²/s²
0-3 km storm-relative helicity: 104 m²/s²
Significant tornado parameter: 0.1
Supercell composite: 1.8

Open this sounding in Storm Lab

The text

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

000 
WUUS51 KPHI 292331
SVRPHI
NJC023-025-300030-
/O.NEW.KPHI.SV.W.0159.090729T2331Z-090730T0030Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
731 PM EDT WED JUL 29 2009

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  MONMOUTH COUNTY IN CENTRAL NEW JERSEY...
  THIS INCLUDES THE CITY OF SANDY HOOK...
  SOUTHERN MIDDLESEX COUNTY IN NORTHERN NEW JERSEY...
  THIS INCLUDES THE CITY OF PERTH AMBOY...

* UNTIL 830 PM EDT

* AT 727 PM 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 WEST FREEHOLD...OR 18 MILES
  NORTHWEST OF TOMS RIVER...AND MOVING NORTHEAST AT 35 MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  EAST FREEHOLD...MARLBORO AND YORKETOWN AROUND 740 PM EDT...
  ROBERTSVILLE AROUND 745 PM EDT...
  HOLMDEL...MORGANVILLE...LINCROFT AND MATAWAN AROUND 750 PM EDT...
  MIDDLETOWN AROUND 755 PM EDT...
  KEANSBURG AROUND 800 PM EDT...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 800 PM EDT
WEDNESDAY EVENING FOR DELAWARE AND NORTHEASTERN MARYLAND AND NEW
JERSEY AND EASTERN PENNSYLVANIA.

&&

LAT...LON 4014 7408 4019 7445 4036 7451 4058 7422
      4056 7421 4053 7425 4052 7423 4047 7426
      4044 7420 4046 7412 4040 7403 4042 7399
      4046 7401 4046 7400 4042 7396 4027 7397
TIME...MOT...LOC 2331Z 211DEG 32KT 4022 7430

$$

EBERWINE

1 follow-up statement

000 
WWUS51 KPHI 300001
SVSPHI

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
801 PM EDT WED JUL 29 2009

NJC023-025-300009-
/O.CAN.KPHI.SV.W.0159.000000T0000Z-090730T0030Z/
MIDDLESEX NJ-MONMOUTH NJ-
801 PM EDT WED JUL 29 2009

...THE SEVERE THUNDERSTORM WARNING FOR MONMOUTH AND SOUTHERN
MIDDLESEX COUNTIES IS CANCELLED...

THE STRONGEST WINDS HAVE MOVED INTO THE RARITAN BAY. 

LAT...LON 4014 7408 4019 7445 4036 7451 4058 7422
      4056 7421 4053 7425 4052 7423 4047 7426
      4044 7420 4046 7412 4040 7403 4042 7399
      4046 7401 4046 7400 4042 7396 4027 7397
TIME...MOT...LOC 2359Z 211DEG 32KT 4043 7413

$$

EBERWINE

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 29, 10:15 AM EDT	Flash Flood Watch	PHI	Hunterdon, Mercer, Middlesex, Morris, Somerset, Sussex and 1 more	17 hr
Jul 29, 12:55 PM EDT	Severe Thunderstorm Warning	PHI	Hunterdon, Mercer, Somerset	65 min
Jul 29, 1:30 PM EDT	Areal Flood Advisory	PHI	Morris, Somerset	3 hr
Jul 29, 1:35 PM EDT	Severe Thunderstorm Warning	PHI	Middlesex, Somerset	55 min
Jul 29, 1:56 PM EDT	Severe Thunderstorm Warning	PHI	Sussex	64 min
Jul 29, 2:10 PM EDT	Tornado Warning	PHI	Sussex	65 min
Jul 29, 2:21 PM EDT	Areal Flood Advisory	PHI	Middlesex	3 hr
Jul 29, 2:32 PM EDT	Flash Flood Warning	PHI	Sussex	6 hr
Jul 29, 2:50 PM EDT	Flash Flood Warning	PHI	Middlesex	4 hr
Jul 29, 3:52 PM EDT	Flash Flood Warning	PHI	Morris, Somerset	4 hr
Jul 29, 5:09 PM EDT	Severe Thunderstorm Warning	PHI	Burlington, Mercer	66 min
Jul 29, 5:48 PM EDT	Special Marine Warning	PHI		57 min
Jul 29, 5:55 PM EDT	Areal Flood Advisory	PHI	Burlington, Camden, Gloucester, Mercer, Middlesex, Salem	4 hr
Jul 29, 6:11 PM EDT	Severe Thunderstorm Warning	PHI	Cumberland	26 min
Jul 29, 6:26 PM EDT	Severe Thunderstorm Warning	PHI	Atlantic, Camden, Gloucester	38 min
Jul 29, 6:42 PM EDT	Areal Flood Advisory	PHI	Atlantic, Burlington, Camden, Cumberland, Gloucester, Mercer and 4 more	3 hr
Jul 29, 6:42 PM EDT	Severe Thunderstorm Warning	PHI	Atlantic, Burlington, Camden	39 min
Jul 29, 6:44 PM EDT	Flash Flood Warning	PHI	Middlesex, Somerset	3 hr
Jul 29, 6:50 PM EDT	Areal Flood Advisory	PHI	Morris	94 min

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.