Alert archive / New Jersey / Severe Thunderstorm Warnings in 2008

Severe Thunderstorm Warning 179, NWS Philadelphia/Mount Holly

July 27, 20084 counties in New Jersey; New Castle County, Delaware; Delaware County, Philadelphia County, Pennsylvania

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Jul 27, 2008, 2:17 PM EDT for 4 counties in New Jersey; New Castle County, Delaware; Delaware County, Philadelphia County, Pennsylvania. It was in force for 58 min. 3 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: Jul 27, 2008, 2:17 PM EDT (18:17 UTC)
Expired: Jul 27, 2008, 3:15 PM EDT
In force: 58 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon

Counties New Castle County, DE, Camden County, NJ, Cumberland County, NJ, Gloucester County, NJ, Salem County, NJ, Delaware County, PA, Philadelphia County, PA

The radar

The Philadelphia radar (KDIX), 72 km from the middle of the area, began a volume at 18:19 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
Jul 27, 2:20 PM EDT	HAIL 0.75	Boothwyn, PA	PENNY SIZE HAIL REPORTED IN BOOTHWYN. NUMEROUS POWER OUTAGES REPORTED.
Jul 27, 2:27 PM EDT	HAIL 0.88	5 Ene Paulsboro, NJ	NICKEL SIZE HAIL REPORTED IN WEST DEPTFORD.
Jul 27, 2:30 PM EDT	HAIL 1.75	Brooklawn, NJ	HAIL UP TO THE SIZE OF GOLF BALLS REPORTED IN BROOKLAWN.

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
Jul 27, 11:26 AM EDT	Severe Thunderstorm Watch	SPC	8 hr

The nearest sounding before it

Wallops Is Stn, VA (KWAL), launched 12:00Z, 6.3 hours before the alert went out and 205 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: 1209 J/kg
Mixed-layer CIN: -54 J/kg
Mixed-layer LCL: 775 m above ground
0-6 km bulk shear: 23 kt
0-1 km storm-relative helicity: 62 m²/s²
0-3 km storm-relative helicity: 86 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.7

Open this sounding in Storm Lab

The text

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

000 
WUUS51 KPHI 271818
SVRPHI
DEC003-NJC007-011-015-033-PAC045-101-271915-
/O.NEW.KPHI.SV.W.0179.080727T1817Z-080727T1915Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
217 PM EDT SUN JUL 27 2008

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  EXTREME NORTHEASTERN NEW CASTLE COUNTY IN NORTHERN DELAWARE...
  SOUTHEASTERN DELAWARE COUNTY IN SOUTHEAST PENNSYLVANIA...
  SOUTHWESTERN PHILADELPHIA COUNTY IN SOUTHEAST PENNSYLVANIA...
  CENTRAL CAMDEN COUNTY IN SOUTHERN NEW JERSEY...
  EXTREME NORTH CENTRAL CUMBERLAND COUNTY IN SOUTHERN NEW JERSEY...
  GLOUCESTER COUNTY IN SOUTHERN NEW JERSEY...
  NORTHEASTERN SALEM COUNTY IN SOUTHERN NEW JERSEY...

* UNTIL 315 PM EDT

* AT 215 PM 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
  CHESTER...AND MOVING EAST AT 25 MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  BECKETT BY 225 PM...
  GIBBSTOWN AND FOLCROFT BY 235   PM...
  MULLICA HILL BY 250 PM...
  WOODBURY BY 255 PM...
  BELLMAWR BY 305 PM...
  TURNERSVILLE AND LINDENWOLD BY 315 PM...

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

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

LAT...LON 3989 7514 3981 7494 3972 7498 3956 7505
      3962 7542 3973 7538 3973 7550 3995 7542
TIME...MOT...LOC 1817Z 278DEG 16KT 3984 7538

$$

IOVINO

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 27, 11:29 AM EDT	Severe Thunderstorm Warning	PHI	Atlantic, Burlington	46 min
Jul 27, 11:41 AM EDT	Severe Thunderstorm Warning	PHI	Monmouth	34 min
Jul 27, 11:50 AM EDT	Severe Thunderstorm Warning	PHI	Sussex, Warren	70 min
Jul 27, 12:06 PM EDT	Severe Thunderstorm Warning	PHI	Atlantic, Cape May	54 min
Jul 27, 12:12 PM EDT	Special Marine Warning	PHI		63 min
Jul 27, 12:41 PM EDT	Severe Thunderstorm Warning	PHI	Atlantic, Burlington, Ocean	49 min
Jul 27, 12:44 PM EDT	Special Marine Warning	PHI		61 min
Jul 27, 1:18 PM EDT	Severe Thunderstorm Warning	PHI	Monmouth	57 min
Jul 27, 1:19 PM EDT	Special Marine Warning	PHI		56 min
Jul 27, 1:44 PM EDT	Severe Thunderstorm Warning	PHI	Hunterdon, Mercer	61 min
Jul 27, 1:58 PM EDT	Severe Thunderstorm Warning	PHI	Monmouth	62 min
Jul 27, 2:00 PM EDT	Severe Thunderstorm Warning	PHI	Salem	60 min
Jul 27, 2:06 PM EDT	Areal Flood Advisory	PHI	Monmouth	3 hr
Jul 27, 2:11 PM EDT	Severe Thunderstorm Warning	PHI	Hunterdon, Mercer, Middlesex, Monmouth, Somerset	64 min
Jul 27, 2:14 PM EDT	Severe Thunderstorm Warning	PHI	Burlington, Camden, Mercer, Monmouth, Ocean	61 min
Jul 27, 2:18 PM EDT	Severe Thunderstorm Warning	PHI	Middlesex, Morris, Somerset	57 min
Jul 27, 2:30 PM EDT	Areal Flood Advisory	PHI	Hunterdon, Mercer	2 hr
Jul 27, 2:31 PM EDT	Severe Thunderstorm Warning	PHI	Cumberland, Salem	59 min
Jul 27, 2:38 PM EDT	Special Marine Warning	PHI		67 min
Jul 27, 2:38 PM EDT	Severe Thunderstorm Warning	PHI	Middlesex, Monmouth, Ocean	67 min
Jul 27, 2:44 PM EDT	Special Marine Warning	PHI		2 hr
Jul 27, 2:50 PM EDT	Areal Flood Advisory	PHI	Middlesex, Morris, Somerset	115 min
Jul 27, 2:52 PM EDT	Severe Thunderstorm Warning	PHI	Burlington, Mercer, Monmouth, Ocean	53 min
Jul 27, 3:01 PM EDT	Special Marine Warning	PHI		119 min
Jul 27, 3:12 PM EDT	Severe Thunderstorm Warning	PHI	Atlantic, Burlington, Camden, Cape May, Cumberland, Gloucester and 2 more	63 min
Jul 27, 3:41 PM EDT	Severe Thunderstorm Warning	PHI	Burlington, Ocean	34 min
Jul 27, 3:49 PM EDT	Special Marine Warning	PHI		56 min
Jul 27, 4:05 PM EDT	Special Marine Warning	PHI		115 min
Jul 27, 4:09 PM EDT	Special Marine Warning	PHI		2 hr
Jul 27, 4:15 PM EDT	Severe Thunderstorm Warning	PHI	Atlantic, Cape May	60 min
Jul 27, 4:39 PM EDT	Special Marine Warning	PHI		51 min
Jul 27, 4:44 PM EDT	Special Marine Warning	PHI		61 min
Jul 27, 5:45 PM EDT	Special Marine Warning	PHI		90 min
Jul 27, 5:47 PM EDT	Special Marine Warning	PHI		88 min
Jul 27, 12:57 PM EDT	Severe Thunderstorm Warning	PHI	New Castle	63 min
Jul 27, 2:35 PM EDT	Severe Thunderstorm Warning	PHI	Kent, Sussex	55 min
Jul 27, 3:38 PM EDT	Severe Thunderstorm Warning	PHI	Kent, Sussex	54 min
Jul 27, 12:07 PM EDT	Severe Thunderstorm Warning	PHI	Chester	53 min
Jul 27, 12:19 PM EDT	Severe Thunderstorm Warning	PHI	Berks, Chester, Lehigh, Montgomery	56 min
Jul 27, 12:25 PM EDT	Areal Flood Advisory	PHI	Berks, Bucks, Chester, Lehigh, Montgomery	3 hr
Jul 27, 12:38 PM EDT	Severe Thunderstorm Warning	PHI	Chester	67 min
Jul 27, 12:50 PM EDT	Areal Flood Advisory	PHI	Bucks, Chester, Montgomery	3 hr
Jul 27, 1:00 PM EDT	Severe Thunderstorm Warning	PHI	Bucks, Montgomery	60 min
Jul 27, 1:34 PM EDT	Flash Flood Warning	PHI	Chester	3 hr
Jul 27, 5:04 PM EDT	Severe Thunderstorm Warning	PHI	Berks, Chester	56 min
Jul 27, 6:44 PM EDT	Areal Flood Advisory	PHI	Chester	72 min

Nearby

Severe Thunderstorm Warnings in New Jersey, 2008 Severe Thunderstorm Warnings in Pennsylvania, 2008 Severe Thunderstorm Warnings in Delaware, 2008 Every severe thunderstorm warning in 2008

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.