Alert archive / New Jersey / Severe Thunderstorm Warnings in 2008

Severe Thunderstorm Warning 220, NWS Philadelphia/Mount Holly

August 10, 2008Camden County, Gloucester County, Salem County, New Jersey; New Castle County, Delaware; Delaware County, Philadelphia County, Pennsylvania

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Aug 10, 2008, 12:40 PM EDT for Camden County, Gloucester County, Salem County, New Jersey; New Castle County, Delaware; Delaware County, Philadelphia County, Pennsylvania. It was in force for 95 min. 9 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 10, 2008, 12:40 PM EDT (16:40 UTC)
Expired: Aug 10, 2008, 2:15 PM EDT
In force: 95 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon

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

The radar

The Dover AFB radar (KDOX), 92 km from the middle of the area, began a volume at 16:42 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

Time	Report	Where
Aug 10, 1:30 PM EDT	HAIL 1.25	3 Nne Elmer, NJ
Aug 10, 1:35 PM EDT	HAIL 0.5	Turnersville, NJ
Aug 10, 1:37 PM EDT	HAIL 0.75	Turnersville, NJ
Aug 10, 1:40 PM EDT	HAIL 0.5	4 W Turnersville, NJ
Aug 10, 1:40 PM EDT	HAIL 0.5	Turnersville, NJ
Aug 10, 1:40 PM EDT	HAIL 0.75	N Mullica Hill, NJ
Aug 10, 1:45 PM EDT	HAIL 1	4 W Turnersville, NJ
Aug 10, 1:56 PM EDT	HAIL 0.5	Somerdale, NJ
Aug 10, 1:58 PM EDT	HAIL 0.88	N Turnersville, NJ

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
Aug 10, 10:46 AM EDT	Severe Thunderstorm Watch	SPC	10 hr

The nearest sounding before it

Washington/Dulle, VA (KIAD), launched 12:00Z, 4.7 hours before the alert went out and 185 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: 771 J/kg
Mixed-layer CIN: -66 J/kg
Mixed-layer LCL: 923 m above ground
0-6 km bulk shear: 25 kt
0-1 km storm-relative helicity: 3 m²/s²
0-3 km storm-relative helicity: 85 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.8

Open this sounding in Storm Lab

The text

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

000 
WUUS51 KPHI 101640
SVRPHI
DEC003-NJC007-015-033-PAC045-101-101815-
/O.NEW.KPHI.SV.W.0220.080810T1640Z-080810T1815Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
1240 PM EDT SUN AUG 10 2008

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  EAST CENTRAL 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...
  GLOUCESTER COUNTY IN SOUTHERN NEW JERSEY...
  SALEM COUNTY IN SOUTHERN NEW JERSEY...

* UNTIL 215 PM EDT

* AT 1233 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE HAIL...AND
  DAMAGING WINDS IN EXCESS OF 60 MPH.  THIS STORM WAS LOCATED NEAR
  CARNEYS POINT...OR ABOUT NEAR WILMINGTON...AND MOVING NORTHEAST 
  AT 15 MPH. THIS THUNDERSTORM IS PART OF A LARGE AREA OF THUNDERSTORMS
  THAT WAS EXTENDING FROM NEAR THE DELAWARE RIVER IN CAMDEN COUNTY
  SOUTHWESTWARD INTO NORTHERN DELAWARE.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  BECKETT BY 105 PM...
  GIBBSTOWN BY 130 PM...
  PHILADELPHIA INTERNATIONAL AIRPORT AND FOLCROFT BY 145 PM...
  WOODBURY BY 155 PM...
  SOUTH PHILADELPHIA BY 200 PM...
  BELLMAWR BY 205 PM...

THUNDERSTORMS ARE CAPABLE OF PRODUCING HEAVY RAINFALL WHICH MAY
RESULT IN LOCALIZED AREAS OF FLOODING. DO NOT DRIVE IN AREAS WHERE
WATER IS CROSSING THE ROAD.

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.

THIS STORM HAS A HISTORY OF PRODUCING DESTRUCTIVE WINDS AND LARGE
DAMAGING HAIL. SEEK SHELTER NOW INSIDE A STURDY STRUCTURE AND STAY
AWAY FROM WINDOWS

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 700 PM SUNDAY
EVENING FOR DELAWARE AND NORTHEASTERN MARYLAND AND NEW JERSEY AND
EASTERN PENNSYLVANIA.

LAT...LON 3969 7561 3996 7517 3977 7491 3948 7536
      3956 7553 3957 7553 3958 7554 3957 7557
      3963 7569
TIME...MOT...LOC 1639Z 225DEG 13KT 3969 7546

$$

RNS

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 10, 9:48 AM EDT	Special Marine Warning	PHI		57 min
Aug 10, 9:55 AM EDT	Severe Thunderstorm Warning	PHI	Cape May	46 min
Aug 10, 10:11 AM EDT	Severe Thunderstorm Warning	PHI	Salem	64 min
Aug 10, 10:39 AM EDT	Severe Thunderstorm Warning	PHI	Gloucester	66 min
Aug 10, 11:17 AM EDT	Severe Thunderstorm Warning	PHI	Burlington, Camden, Gloucester	58 min
Aug 10, 11:32 AM EDT	Areal Flood Advisory	PHI	Camden, Gloucester	3 hr
Aug 10, 11:46 AM EDT	Severe Thunderstorm Warning	PHI	Gloucester, Salem	59 min
Aug 10, 11:55 AM EDT	Severe Thunderstorm Warning	PHI	Atlantic, Burlington, Camden, Gloucester	65 min
Aug 10, 11:56 AM EDT	Flash Flood Warning	PHI	Camden, Gloucester	4 hr
Aug 10, 12:05 PM EDT	Special Marine Warning	PHI		55 min
Aug 10, 12:09 PM EDT	Tornado Warning	PHI	Gloucester, Salem	36 min
Aug 10, 12:45 PM EDT	Severe Thunderstorm Warning	PHI	Cape May	60 min
Aug 10, 12:51 PM EDT	Severe Thunderstorm Warning	PHI	Atlantic, Burlington, Camden, Gloucester, Ocean	84 min
Aug 10, 12:56 PM EDT	Tornado Warning	PHI	Gloucester, Salem	34 min
Aug 10, 1:05 PM EDT	Severe Thunderstorm Warning	PHI	Hunterdon, Warren	115 min
Aug 10, 1:22 PM EDT	Flash Flood Warning	PHI	Gloucester, Salem	3 hr
Aug 10, 1:29 PM EDT	Tornado Warning	PHI	Camden, Gloucester, Salem	28 min
Aug 10, 1:53 PM EDT	Severe Thunderstorm Warning	PHI	Atlantic, Burlington, Camden, Cumberland, Gloucester, Salem	67 min
Aug 10, 2:10 PM EDT	Severe Thunderstorm Warning	PHI	Ocean	50 min
Aug 10, 2:23 PM EDT	Special Marine Warning	PHI		67 min
Aug 10, 2:36 PM EDT	Special Marine Warning	PHI		54 min
Aug 10, 2:50 PM EDT	Severe Thunderstorm Warning	PHI	Burlington	55 min
Aug 10, 3:33 PM EDT	Severe Thunderstorm Warning	PHI	Camden, Gloucester, Salem	39 min
Aug 10, 3:44 PM EDT	Special Marine Warning	PHI		61 min
Aug 10, 3:46 PM EDT	Severe Thunderstorm Warning	PHI	Ocean	24 min
Aug 10, 4:10 PM EDT	Areal Flood Warning	PHI	Atlantic, Burlington, Camden, Gloucester, Ocean, Salem	3 hr
Aug 10, 6:36 PM EDT	Severe Thunderstorm Warning	PHI	Camden, Gloucester, Salem	69 min
Aug 10, 6:45 PM EDT	Areal Flood Advisory	PHI	Camden, Gloucester, Salem	2 hr
Aug 10, 7:04 PM EDT	Severe Thunderstorm Warning	PHI	Atlantic, Cape May	56 min
Aug 10, 7:09 PM EDT	Severe Thunderstorm Warning	PHI	Cumberland, Salem	66 min
Aug 10, 7:15 PM EDT	Special Marine Warning	PHI		60 min
Aug 10, 7:42 PM EDT	Severe Thunderstorm Warning	PHI	Cumberland	56 min
Aug 10, 7:45 PM EDT	Special Marine Warning	PHI		60 min
Aug 10, 7:53 PM EDT	Severe Thunderstorm Warning	PHI	Atlantic, Burlington, Camden, Gloucester	67 min
Aug 10, 10:21 AM EDT	Severe Thunderstorm Warning	PHI	New Castle	54 min
Aug 10, 12:03 PM EDT	Severe Thunderstorm Warning	PHI	Sussex	57 min
Aug 10, 5:45 PM EDT	Severe Thunderstorm Warning	PHI	New Castle	75 min
Aug 10, 5:59 PM EDT	Areal Flood Advisory	PHI	New Castle	2 hr
Aug 10, 10:18 AM EDT	Severe Thunderstorm Warning	PHI	Chester	57 min
Aug 10, 10:44 AM EDT	Severe Thunderstorm Warning	PHI	Delaware	61 min
Aug 10, 11:09 AM EDT	Severe Thunderstorm Warning	PHI	Chester, Delaware, Montgomery, Philadelphia	66 min
Aug 10, 12:17 PM EDT	Flash Flood Warning	PHI	Chester, Delaware, Montgomery	4 hr
Aug 10, 12:21 PM EDT	Severe Thunderstorm Warning	PHI	Berks, Bucks, Lehigh, Montgomery	84 min
Aug 10, 1:10 PM EDT	Severe Thunderstorm Warning	PHI	Berks, Chester, Montgomery	65 min
Aug 10, 1:47 PM EDT	Severe Thunderstorm Warning	PHI	Chester, Montgomery	58 min
Aug 10, 3:05 PM EDT	Flash Flood Warning	PHI	Chester	3 hr
Aug 10, 3:35 PM EDT	Severe Thunderstorm Warning	PHI	Berks	40 min
Aug 10, 4:45 PM EDT	Severe Thunderstorm Warning	PHI	Chester	75 min
Aug 10, 5:25 PM EDT	Areal Flood Advisory	PHI	Berks, Montgomery	110 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.