Alert archive / Delaware / Special Weather Statements in 2021

Special Weather Statement, NWS Philadelphia/Mount Holly

August 30, 2021New Castle County, Delaware

NWS Philadelphia/Mount Holly issued this special weather statement at Aug 30, 2021, 3:44 PM EDT for New Castle County, Delaware. It was in force for 31 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 30, 2021, 3:44 PM EDT (19:44 UTC)
Expired: Aug 30, 2021, 4:15 PM EDT
In force: 31 min
Issued by: NWS Philadelphia/Mount Holly
Hail: 0.25 in
Wind: 40

County New Castle County, DE

The radar

The Dover AFB radar (KDOX), 90 km from the middle of the area, began a volume at 19:46 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, 7.7 hours before the alert went out and 171 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: 843 J/kg
Mixed-layer CIN: -70 J/kg
Mixed-layer LCL: 860 m above ground
0-6 km bulk shear: 20 kt
0-1 km storm-relative helicity: 65 m²/s²
0-3 km storm-relative helicity: 63 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

164 
WWUS81 KPHI 301944
SPSPHI

Special Weather Statement
National Weather Service Mount Holly NJ
344 PM EDT Mon Aug 30 2021
 
DEZ001-NJZ016-302015-
New Castle DE-Salem NJ-
344 PM EDT Mon Aug 30 2021

...A strong thunderstorm will impact portions of northern New Castle
and western Salem Counties through 415 PM EDT...

At 343 PM EDT, Doppler radar was tracking a strong thunderstorm over
Glasgow, or near Newark, moving east at 20 mph.

HAZARD...Wind gusts up to 40 mph and pea size hail.

SOURCE...Radar indicated.

IMPACT...Gusty winds could knock down tree limbs and blow around 
         unsecured objects. Minor damage to outdoor objects is 
         possible.

Locations impacted include...
Wilmington, Newark, Pennsville, Carneys Point, New Castle, Penns
Grove, Salem, Delaware City, Newport, Saint Georges, Mount Pleasant,
Stanton, Glasgow, Bear, Delaware Memorial Bridge, Port Penn,
Wilmington Manor, Hope Creek, Pike Creek and Brookside.

This includes the following highways...
 Interstate 95 in Delaware between mile markers 0 and 12.
 Interstate 295 in New Jersey between mile markers 0 and 6.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building. 

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 3973 7541 3944 7548 3950 7578 3962 7579
      3971 7579
TIME...MOT...LOC 1943Z 288DEG 17KT 3963 7573 

MAX HAIL SIZE...0.25 IN
MAX WIND GUST...40 MPH

$$

Gorse

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 30, 5:00 AM EDT	Flash Flood Watch	PHI	Atlantic, Burlington, Camden, Cape May, Cumberland, Gloucester and 10 more	71 hr
Aug 30, 5:44 AM EDT	Dense Fog Advisory	PHI	Atlantic, Burlington, Camden, Cape May, Cumberland, Gloucester and 3 more	3 hr
Aug 30, 4:48 PM EDT	Special Weather Statement	PHI	Atlantic, Cumberland	27 min
Aug 30, 5:16 PM EDT	Severe Thunderstorm Warning	PHI	Atlantic, Cape May, Cumberland	44 min
Aug 30, 5:21 PM EDT	Special Weather Statement	PHI	Atlantic	24 min
Aug 30, 5:26 PM EDT	Special Marine Warning	PHI		64 min
Aug 30, 5:44 PM EDT	Special Marine Warning	PHI		61 min
Aug 30, 5:53 PM EDT	Special Weather Statement	PHI	Atlantic	22 min
Aug 30, 5:56 PM EDT	Special Weather Statement	PHI	Cape May	49 min
Aug 30, 6:16 PM EDT	Special Marine Warning	PHI		89 min
Aug 30, 6:41 PM EDT	Special Weather Statement	PHI	Cape May	34 min
Aug 30, 7:20 PM EDT	Special Weather Statement	PHI	Cape May	25 min
Aug 30, 7:31 PM EDT	Special Marine Warning	PHI		59 min
Aug 30, 4:14 PM EDT	Special Weather Statement	PHI	Kent	31 min
Aug 30, 6:02 PM EDT	Severe Thunderstorm Warning	PHI	Kent, Sussex	28 min
Aug 30, 3:46 PM EDT	Special Weather Statement	PHI	Kent	29 min
Aug 30, 4:27 PM EDT	Special Weather Statement	PHI	Kent	33 min
Aug 30, 4:54 PM EDT	Severe Thunderstorm Warning	PHI	Kent, Queen Anne's	51 min

Nearby

Special Weather Statements in Delaware, 2021 Every special weather statement in 2021

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.