Alert archive / New Jersey / Special Weather Statements in 2017

Special Weather Statement, NWS Philadelphia/Mount Holly

July 24, 2017Camden County, Gloucester County, Salem County, New Jersey; Philadelphia County, Pennsylvania; New Castle County, Delaware

NWS Philadelphia/Mount Holly issued this special weather statement at Jul 24, 2017, 9:01 PM EDT for Camden County, Gloucester County, Salem County, New Jersey; Philadelphia County, Pennsylvania; New Castle County, Delaware. It was in force for 59 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 24, 2017, 9:01 PM EDT (01:01 UTC)
Expired: Jul 24, 2017, 10:00 PM EDT
In force: 59 min
Issued by: NWS Philadelphia/Mount Holly

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

The radar

The Dover AFB radar (KDOX), 82 km from the middle of the area, began a volume at 01:01 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 nearest sounding before it

Washington/Dulle, VA (KIAD), launched 00:00Z, 1.0 hours before the alert went out and 179 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: 1156 J/kg
Mixed-layer CIN: -30 J/kg
Mixed-layer LCL: 1330 m above ground
0-6 km bulk shear: 39 kt
0-1 km storm-relative helicity: 122 m²/s²
0-3 km storm-relative helicity: 177 m²/s²
Significant tornado parameter: 0.4
Supercell composite: 4.0

Open this sounding in Storm Lab

The text

As transmitted.

807 
WWUS81 KPHI 250101
SPSPHI

Special Weather Statement
National Weather Service MOUNT HOLLY NJ
901 PM EDT MON JUL 24 2017

DEZ001-NJZ016>019-021-027-PAZ070-071-102-104-250200-
New Castle-Northwestern
Burlington-Salem-Cumberland-Camden-Southeastern
Burlington-Gloucester-Eastern Montgomery-Delaware-Eastern
Chester-Philadelphia-
901 PM EDT MON JUL 24 2017

...A LINE OF STRONG THUNDERSTORMS WILL AFFECT CENTRAL NEW CASTLE...
SOUTHEASTERN CECIL...NORTHWESTERN CUMBERLAND...SALEM...CAMDEN...
GLOUCESTER...WEST CENTRAL BURLINGTON...SOUTH CENTRAL MONTGOMERY...
SOUTHEASTERN CHESTER...SOUTHWESTERN PHILADELPHIA AND SOUTHEASTERN
DELAWARE COUNTIES...

At 901 PM EDT, radar indicated strong thunderstorms were located
along a line extending from Roxborough to Bohemias Mills. Movement
was east at 35 mph.

Winds up to 40 mph are possible with these storms.

Locations impacted include...
Philadelphia, Camden, Wilmington, Vineland, Bridgeton, Middletown,
Gloucester City, Cherry Hill, Evesham, Mount Laurel, Chester,
Deptford, Voorhees, Medford, West Deptford, Glassboro, Lindenwold,
Pennsville, Lumberton and Bellmawr.

Torrential rainfall is also occurring with these storms, and may
cause localized flooding. Do not drive your vehicle through flooded
roadways.

Frequent cloud to ground lightning is occurring with this storm.
Lightning can strike 10 miles away from a thunderstorm. Seek a safe
shelter inside a building or vehicle.

LAT...LON 3937 7526 3938 7542 3946 7552 3946 7554
      3957 7551 3962 7557 3966 7552 3972 7551
      3962 7561 3960 7561 3959 7556 3959 7557
      3951 7556 3946 7559 3939 7553 3941 7577
      3954 7578 4002 7525 3998 7457
TIME...MOT...LOC 0101Z 270DEG 30KT 3997 7521 3947 7576 

$$

amc

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 24, 8:22 PM EDT	Special Weather Statement	PHI	Burlington, Mercer	38 min
Jul 24, 8:28 PM EDT	Special Marine Warning	PHI		92 min
Jul 24, 8:59 PM EDT	Areal Flood Advisory	PHI	Camden, Gloucester, Salem	2 hr
Jul 24, 9:06 PM EDT	Areal Flood Advisory	PHI	Burlington, Camden	114 min
Jul 24, 10:01 PM EDT	Areal Flood Advisory	PHI	Burlington, Camden, Gloucester, Salem	119 min
Jul 24, 10:20 PM EDT	Special Marine Warning	PHI		85 min
Jul 24, 10:38 PM EDT	Severe Thunderstorm Warning	PHI	Atlantic, Cumberland, Salem	52 min
Jul 24, 10:58 PM EDT	Special Marine Warning	PHI		92 min
Jul 24, 11:30 PM EDT	Special Weather Statement	PHI	Cape May, Cumberland	45 min
Jul 24, 11:47 PM EDT	Special Marine Warning	PHI		118 min
Jul 25, 12:40 AM EDT	Special Marine Warning	PHI		2 hr
Jul 25, 1:40 AM EDT	Special Marine Warning	PHI		2 hr
Jul 25, 3:14 AM EDT	Areal Flood Warning	PHI	Salem	6 hr
Jul 25, 3:25 PM EDT	Coastal Flood Advisory	PHI	Atlantic, Burlington, Cape May, Middlesex, Monmouth, Ocean	11 hr
Jul 24, 8:08 PM EDT	Severe Thunderstorm Warning	PHI	Chester, Delaware	52 min
Jul 24, 8:19 PM EDT	Areal Flood Advisory	PHI	Bucks, Montgomery, Philadelphia	116 min
Jul 24, 9:44 PM EDT	Flash Flood Warning	PHI	Philadelphia	4 hr
Jul 24, 11:11 PM EDT	Areal Flood Warning	PHI	Montgomery	4 hr
Jul 24, 9:52 PM EDT	Severe Thunderstorm Warning	PHI	Caroline, Kent, Queen Anne's	38 min
Jul 24, 10:02 PM EDT	Special Weather Statement	PHI	Cecil	43 min
Jul 24, 10:06 PM EDT	Severe Thunderstorm Warning	PHI	Caroline, Cecil, Kent, Queen Anne's	39 min
Jul 24, 10:50 PM EDT	Severe Thunderstorm Warning	PHI	Caroline, Queen Anne's	40 min
Jul 24, 11:10 PM EDT	Special Weather Statement	PHI	Talbot	35 min
Jul 24, 11:55 PM EDT	Areal Flood Advisory	PHI	Caroline, Queen Anne's	2 hr
Jul 25, 12:34 AM EDT	Severe Thunderstorm Warning	PHI	Caroline	41 min
Jul 25, 12:16 AM EDT	Special Weather Statement	PHI	Sussex	44 min
Jul 25, 1:15 AM EDT	Special Weather Statement	PHI	Sussex	45 min

Nearby

Special Weather Statements in New Jersey, 2017 Special Weather Statements in Pennsylvania, 2017 Special Weather Statements in Delaware, 2017 Every special weather statement in 2017

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.