Alert archive / New Jersey / Severe Thunderstorm Warnings in 2008

Severe Thunderstorm Warning 235, NWS Philadelphia/Mount Holly

August 10, 2008Camden County, Gloucester County, Salem County, New Jersey; New Castle County, Delaware; Cecil County, Maryland

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Aug 10, 2008, 6:36 PM EDT for Camden County, Gloucester County, Salem County, New Jersey; New Castle County, Delaware; Cecil County, Maryland. It was in force for 69 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: Aug 10, 2008, 6:36 PM EDT (22:36 UTC)
Expired: Aug 10, 2008, 7:45 PM EDT
In force: 69 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon

Counties New Castle County, DE, Cecil County, MD, Camden County, NJ, Gloucester County, NJ, Salem County, NJ

The radar

The Dover AFB radar (KDOX), 89 km from the middle of the area, began a volume at 22:37 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
Aug 10, 6:45 PM EDT	HAIL 0.88	Bear, DE	STRONG WINDS
Aug 10, 7:30 PM EDT	HAIL 0.88	Mullica Hill, NJ
Aug 10, 7:45 PM EDT	HAIL 0.5	Williamstown, NJ	DIME SIZE HAIL IN CROSS KEYS AND WASHINGTON TOWNSHIP.

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, 10.6 hours before the alert went out and 181 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 102236
SVRPHI
DEC003-MDC015-NJC007-015-033-102345-
/O.NEW.KPHI.SV.W.0235.080810T2236Z-080810T2345Z/

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

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  EAST CENTRAL CECIL COUNTY IN NORTHEAST MARYLAND...
  CENTRAL NEW CASTLE COUNTY IN NORTHERN DELAWARE...
  SOUTHERN CAMDEN COUNTY IN SOUTHERN NEW JERSEY...
  GLOUCESTER COUNTY IN SOUTHERN NEW JERSEY...
  NORTHERN SALEM COUNTY IN SOUTHERN NEW JERSEY...

* UNTIL 745 PM EDT

* AT 631 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING PENNY SIZE HAIL...AND
  DAMAGING WINDS IN EXCESS OF 60 MPH.  THIS STORM WAS LOCATED NEAR
  WILMINGTON...AND MOVING EAST AT 18 MPH.  ANOTHER SEVERE THUNDERSTORM
  WAS ALSO MOVING EAST ACROSS NEW CASTLE COUNTY DELAWARE AND THIS WILL
  MOVE INTO SALEM AND GLOUCESTER COUNTIES IN NEW JERSEY.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  CARNEYS POINT BY 640 PM...
  BECKETT AND 8 MILES NORTH OF WOODSTOWN BY 700 PM...
  GIBBSTOWN AND MULLICA HILL BY 720 PM...
  WOODBURY AND 7 MILES NORTH OF GLASSBORO BY 740 PM...
  TURNERSVILLE BY 745 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 700 PM SUNDAY
EVENING FOR DELAWARE AND NORTHEASTERN MARYLAND AND NEW JERSEY AND
EASTERN PENNSYLVANIA.

LAT...LON 3959 7587 3981 7537 3987 7514 3972 7487
      3960 7529 3955 7553 3957 7553 3958 7556
      3954 7556 3950 7584
TIME...MOT...LOC 2235Z 255DEG 16KT 3973 7550

$$

RNS

1 follow-up statement

000 
WWUS51 KPHI 102324
SVSPHI

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
724 PM EDT SUN AUG 10 2008

DEC003-MDC015-102334-
/O.CAN.KPHI.SV.W.0235.000000T0000Z-080810T2345Z/
CECIL MD-NEW CASTLE DE-
724 PM EDT SUN AUG 10 2008

...THE SEVERE THUNDERSTORM WARNING FOR CENTRAL NEW CASTLE AND EAST
CENTRAL CECIL COUNTIES IS CANCELLED...

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 900 PM EDT SUNDAY
EVENING FOR DELAWARE AND NORTHEASTERN MARYLAND AND SOUTHERN NEW
JERSEY.

LAT...LON 3971 7490 3966 7509 3965 7510 3963 7527
      3981 7536 3985 7524 3984 7523 3987 7514
      3972 7487
TIME...MOT...LOC 2324Z 257DEG 20KT 3974 7514

$$

NJC007-015-033-102345-
/O.CON.KPHI.SV.W.0235.000000T0000Z-080810T2345Z/
SALEM NJ-CAMDEN NJ-GLOUCESTER NJ-
724 PM EDT SUN AUG 10 2008

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 745 PM EDT
FOR CENTRAL GLOUCESTER...SOUTHERN CAMDEN AND NORTH CENTRAL SALEM
COUNTIES...

AT 718 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A SEVERE THUNDERSTORM CAPABLE OF PRODUCING PENNY SIZE
HAIL...AND DAMAGING WINDS IN EXCESS OF 60 MPH.  THIS STORM WAS
LOCATED NEAR MULLICA HILL...OR 15 MILES SOUTH OF CAMDEN...MOVING EAST
AT 23 MPH.

THE SEVERE THUNDERSTORM WILL BE NEAR...
  TURNERSVILLE AND BLACKWOOD BY 735 PM EDT...

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 900 PM EDT SUNDAY
EVENING FOR DELAWARE AND NORTHEASTERN MARYLAND AND SOUTHERN NEW
JERSEY.

LAT...LON 3971 7490 3966 7509 3965 7510 3963 7527
      3981 7536 3985 7524 3984 7523 3987 7514
      3972 7487
TIME...MOT...LOC 2324Z 257DEG 20KT 3974 7514

$$

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, 12:40 PM EDT	Severe Thunderstorm Warning	PHI	Camden, Gloucester, Salem	95 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, 6:45 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, 6:14 PM EDT	Severe Thunderstorm Warning	PHI	Cecil, Kent	61 min

Nearby

Severe Thunderstorm Warnings in New Jersey, 2008 Severe Thunderstorm Warnings in Delaware, 2008 Severe Thunderstorm Warnings in Maryland, 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.