Alert archive / New Jersey / Special Weather Statements in 2020

Special Weather Statement, NWS Philadelphia/Mount Holly

August 9, 2020Salem County, New Jersey; New Castle County, Delaware

NWS Philadelphia/Mount Holly issued this special weather statement at Aug 9, 2020, 2:25 PM EDT for Salem County, New Jersey; New Castle County, Delaware. It was in force for 65 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: Aug 9, 2020, 2:25 PM EDT (18:25 UTC)
Expired: Aug 9, 2020, 3:30 PM EDT
In force: 65 min
Issued by: NWS Philadelphia/Mount Holly

Counties New Castle County, DE, Salem County, NJ

The radar

The Dover AFB radar (KDOX), 106 km from the middle of the area, began a volume at 18:26 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 12:00Z, 6.4 hours before the alert went out and 165 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: 712 J/kg
Mixed-layer CIN: -34 J/kg
Mixed-layer LCL: 789 m above ground
0-6 km bulk shear: 10 kt
0-1 km storm-relative helicity: 30 m²/s²
0-3 km storm-relative helicity: 59 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

678 
WWUS81 KPHI 091825
SPSPHI

Special Weather Statement
National Weather Service Mount Holly NJ
225 PM EDT Sun Aug 9 2020

DEZ001-MDZ008-NJZ016-017-PAZ070-102-091930-
New Castle-Cecil-Salem-Gloucester-Delaware-Eastern Chester-
225 PM EDT Sun Aug 9 2020

...A STRONG THUNDERSTORM WILL AFFECT NORTHERN NEW CASTLE...
NORTHEASTERN CECIL...WESTERN SALEM...NORTHWESTERN GLOUCESTER...SOUTH
CENTRAL CHESTER AND SOUTHERN DELAWARE COUNTIES...

At 225 PM EDT, a strong thunderstorm was located over North Star, or
7 miles north of Newark, Delaware, moving east at 15 mph.

Wind gusts up to 40 mph and pea size hail are possible with this
storm.

Locations impacted include...
Wilmington, Newark, Elkton, Calvert, Chester, Pennsville, Carneys
Point, Elsmere, Kennett Square, New Castle, Penns Grove, Salem,
Alloway, West Grove, Quinton, Swedesboro, Delaware City, Newport,
Arden and Blake.

This includes the following highways...
 New Jersey Turnpike near exit 1.
 Interstate 95 in Pennsylvania between mile markers 0 and 9.
 Interstate 95 in Delaware between mile markers 0 and 23.
 Interstate 95 in Maryland between mile markers 104 and 109.
 Interstate 295 in New Jersey between mile markers 0 and 15.
 Interstate 476 in Pennsylvania between mile markers 0 and 1.

If outdoors, consider seeking shelter inside a building.

LAT...LON 3974 7595 3975 7592 3976 7592 3991 7576
      3988 7528 3947 7538 3968 7601
TIME...MOT...LOC 1825Z 281DEG 14KT 3978 7572 

$$

Iovino

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 9, 1:00 AM EDT	Dense Fog Advisory	PHI	Atlantic, Burlington, Camden, Cape May, Cumberland, Gloucester and 4 more	4 hr

Nearby

Special Weather Statements in New Jersey, 2020 Special Weather Statements in Delaware, 2020 Every special weather statement in 2020

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.