Alert archive / New Jersey / Severe Thunderstorm Warnings in 2009

Severe Thunderstorm Warning 177, NWS Philadelphia/Mount Holly

August 2, 20095 counties in New Jersey; Bucks County, Pennsylvania

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Aug 2, 2009, 11:48 AM EDT for 5 counties in New Jersey; Bucks County, Pennsylvania. It was in force for 57 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 2, 2009, 11:48 AM EDT (15:48 UTC)
Expired: Aug 2, 2009, 12:45 PM EDT
In force: 57 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon

Counties Hunterdon County, NJ, Mercer County, NJ, Middlesex County, NJ, Monmouth County, NJ, Somerset County, NJ, Bucks County, PA

What was reported inside it

Time	Report	Where	Remark
Aug 2, 12:05 PM EDT	TSTM WND DMG	Lawrenceville, NJ	TREES DOWN.
Aug 2, 12:06 PM EDT	TSTM WND DMG	Ewing, NJ	NUMEROUS TREES SHEARED.

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, 3.8 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-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: 105 J/kg
Mixed-layer CIN: -79 J/kg
Mixed-layer LCL: 723 m above ground
0-6 km bulk shear: 38 kt
0-1 km storm-relative helicity: 73 m²/s²
0-3 km storm-relative helicity: 111 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.5

Open this sounding in Storm Lab

The text

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

000 
WUUS51 KPHI 021548
SVRPHI
NJC019-021-023-025-035-PAC017-021645-
/O.NEW.KPHI.SV.W.0177.090802T1548Z-090802T1645Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
1148 AM EDT SUN AUG 2 2009

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  MERCER COUNTY IN CENTRAL NEW JERSEY...
  THIS INCLUDES THE CITY OF TRENTON...
  NORTHWESTERN MONMOUTH COUNTY IN CENTRAL NEW JERSEY...
  MIDDLESEX COUNTY IN NORTHERN NEW JERSEY...
  THIS INCLUDES THE CITIES OF...PERTH AMBOY...NEW BRUNSWICK...
  SOUTHERN SOMERSET COUNTY IN NORTHERN NEW JERSEY...
  THIS INCLUDES THE CITY OF SOMERVILLE...
  SOUTHEASTERN HUNTERDON COUNTY IN NORTHWEST NEW JERSEY...
  EXTREME SOUTHEASTERN BUCKS COUNTY IN SOUTHEAST PENNSYLVANIA...

* UNTIL 1245 PM EDT

* AT 1146 AM 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 
  LAMBERTVILLE...AND MOVING EAST AT 30 MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  PENNINGTON AROUND NOON EDT...
  HOPEWELL AROUND 1205 PM EDT...
  LAWRENCEVILLE AND SKILLMAN AROUND 1210 PM EDT...
  PRINCETON AROUND 1215 PM EDT...
  ROCKY HILL AROUND 1220 PM EDT...
  SOUTH BRUNSWICK AND KENDALL PARK AROUND 1230 PM EDT...

LAT...LON 4055 7424 4051 7424 4048 7427 4047 7426
      4045 7420 4018 7423 4018 7482 4059 7481
      4060 7431 4059 7429 4060 7422 4059 7420
      4057 7420
TIME...MOT...LOC 1548Z 270DEG 24KT 4035 7492

$$

IOVINO

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 2, 2:19 AM EDT	Flash Flood Watch	PHI	Burlington, Camden, Gloucester, Hunterdon, Mercer, Middlesex and 5 more	13 hr
Aug 2, 7:34 AM EDT	Areal Flood Advisory	PHI	Hunterdon, Mercer	3 hr
Aug 2, 8:48 AM EDT	Areal Flood Warning	PHI	Mercer	4 hr
Aug 2, 10:53 AM EDT	Severe Thunderstorm Warning	PHI	Camden, Gloucester, Salem	67 min
Aug 2, 11:14 AM EDT	Severe Thunderstorm Warning	PHI	Hunterdon, Mercer, Warren	61 min
Aug 2, 11:18 AM EDT	Flash Flood Warning	PHI	Hunterdon, Mercer, Middlesex, Morris, Somerset	9 hr
Aug 2, 11:25 AM EDT	Severe Thunderstorm Warning	PHI	Burlington, Camden, Mercer	65 min
Aug 2, 11:30 AM EDT	Severe Thunderstorm Warning	PHI	Atlantic, Camden, Cape May, Cumberland, Gloucester, Salem	60 min
Aug 2, 11:33 AM EDT	Special Marine Warning	PHI		87 min
Aug 2, 11:51 AM EDT	Tornado Warning	PHI	Mercer	24 min
Aug 2, 12:13 PM EDT	Areal Flood Advisory	PHI	Atlantic, Burlington, Camden, Cape May, Cumberland, Gloucester and 3 more	3 hr
Aug 2, 12:23 PM EDT	Special Marine Warning	PHI		97 min
Aug 2, 12:27 PM EDT	Severe Thunderstorm Warning	PHI	Morris, Somerset	48 min
Aug 2, 12:45 PM EDT	Severe Thunderstorm Warning	PHI	Middlesex, Monmouth	60 min
Aug 2, 12:49 PM EDT	River Flood Warning	PHI	Mercer	8 hr
Aug 2, 1:28 PM EDT	Special Marine Warning	PHI		92 min
Aug 2, 1:43 PM EDT	Severe Thunderstorm Warning	PHI	Cape May	47 min
Aug 2, 1:49 PM EDT	Special Marine Warning	PHI		86 min
Aug 2, 1:51 PM EDT	Special Marine Warning	PHI		84 min
Aug 2, 1:56 PM EDT	Special Marine Warning	PHI		2 hr
Aug 2, 1:59 PM EDT	River Flood Warning	PHI	Hunterdon, Somerset	13 hr
Aug 2, 4:16 PM EDT	River Flood Warning	PHI	Middlesex, Somerset	20 hr
Aug 2, 4:16 PM EDT	River Flood Warning	PHI	Middlesex, Somerset	22 hr
Aug 2, 3:29 AM EDT	Areal Flood Advisory	PHI	Berks	3 hr
Aug 2, 5:54 AM EDT	Areal Flood Advisory	PHI	Chester	3 hr
Aug 2, 7:51 AM EDT	Areal Flood Warning	PHI	Chester	4 hr
Aug 2, 9:04 AM EDT	Areal Flood Warning	PHI	Montgomery, Philadelphia	4 hr
Aug 2, 9:06 AM EDT	Flash Flood Warning	PHI	Berks, Carbon, Chester, Lehigh, Monroe, Northampton	4 hr
Aug 2, 10:08 AM EDT	Flash Flood Warning	PHI	Bucks, Chester, Delaware, Montgomery, Philadelphia	9 hr
Aug 2, 10:08 AM EDT	Severe Thunderstorm Warning	PHI	Chester	67 min
Aug 2, 10:24 AM EDT	Severe Thunderstorm Warning	PHI	Chester, Delaware, Montgomery	66 min
Aug 2, 12:33 PM EDT	River Flood Warning	PHI	Bucks	28 hr
Aug 2, 1:25 PM EDT	Areal Flood Warning	PHI	Montgomery, Philadelphia	6 hr
Aug 2, 4:06 PM EDT	Areal Flood Advisory	PHI	Berks, Carbon, Lehigh, Monroe, Northampton	4 hr
Aug 2, 4:21 PM EDT	River Flood Warning	PHI	Chester	56 min
Aug 2, 4:22 PM EDT	Flash Flood Warning	PHI	Berks	2 hr
Aug 2, 6:15 PM EDT	Areal Flood Warning	PHI	Montgomery, Philadelphia	4 hr
Aug 2, 6:25 PM EDT	Areal Flood Warning	PHI	Philadelphia	4 hr

Nearby

Severe Thunderstorm Warnings in New Jersey, 2009 Severe Thunderstorm Warnings in Pennsylvania, 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive.