Alert archive / Delaware / Special Weather Statements in 2021

Special Weather Statement, NWS Philadelphia/Mount Holly

July 9, 2021New Castle County, Delaware

NWS Philadelphia/Mount Holly issued this special weather statement at Jul 9, 2021, 4:54 PM EDT for New Castle County, Delaware. It was in force for 66 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 9, 2021, 4:54 PM EDT (20:54 UTC)
Expired: Jul 9, 2021, 6:00 PM EDT
In force: 66 min
Issued by: NWS Philadelphia/Mount Holly

County New Castle County, DE

The radar

The Dover AFB radar (KDOX), 106 km from the middle of the area, began a volume at 20:57 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, 8.9 hours before the alert went out and 162 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 862 m above ground
0-6 km bulk shear: 28 kt
0-1 km storm-relative helicity: 42 m²/s²
0-3 km storm-relative helicity: 55 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

542 
WWUS81 KPHI 092054
SPSPHI

Special Weather Statement
National Weather Service Mount Holly NJ
454 PM EDT Fri Jul 9 2021

DEZ001-NJZ016-PAZ070-101-102-092200-
New Castle-Salem-Delaware-Western Chester-Eastern Chester-
454 PM EDT Fri Jul 9 2021

...A STRONG THUNDERSTORM WILL AFFECT NORTHERN NEW CASTLE...
NORTHWESTERN SALEM...SOUTHWESTERN CHESTER AND SOUTHWESTERN DELAWARE
COUNTIES...

At 454 PM EDT, a strong thunderstorm was located over Wakefield, or
15 miles south of Willow Street, moving east at 30 mph.

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

Locations impacted include...
Wilmington, Newark, Pennsville, Carneys Point, Elsmere, Kennett
Square, New Castle, Penns Grove, Salem, Oxford, West Grove, Delaware
City, Newport, Arden, Glen Roy, Stanton, North Star, Glasgow, Bear
and Talleyville.

This includes the following highways...
 Interstate 95 in Pennsylvania between mile markers 0 and 1.
 Interstate 95 in Delaware between mile markers 1 and 23.
 Interstate 295 in New Jersey between mile markers 0 and 5.

LAT...LON 3974 7612 3973 7610 3974 7609 3976 7606
      3985 7602 3984 7542 3979 7542 3978 7544
      3978 7542 3953 7544 3953 7578 3972 7579
      3972 7613
TIME...MOT...LOC 2054Z 276DEG 27KT 3978 7618 

$$

NC

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 8, 10:25 PM EDT	Areal Flood Advisory	PHI	Cape May, Cumberland	7 hr
Jul 8, 11:02 PM EDT	Special Marine Warning	PHI		88 min
Jul 8, 11:59 PM EDT	Areal Flood Advisory	PHI	Salem	5 hr
Jul 9, 12:07 AM EDT	Special Marine Warning	PHI		53 min
Jul 9, 12:08 AM EDT	Areal Flood Advisory	PHI	Atlantic, Camden, Gloucester	6 hr
Jul 9, 12:25 AM EDT	Special Marine Warning	PHI		95 min
Jul 9, 1:34 AM EDT	Special Marine Warning	PHI		86 min
Jul 9, 1:49 AM EDT	Special Marine Warning	PHI		26 min
Jul 9, 2:05 AM EDT	Areal Flood Advisory	PHI	Burlington, Monmouth, Ocean	8 hr
Jul 9, 2:50 AM EDT	Tornado Warning	PHI	Atlantic, Cape May, Cumberland	25 min
Jul 9, 2:53 AM EDT	Special Marine Warning	PHI		68 min
Jul 9, 3:38 AM EDT	Tornado Warning	PHI	Atlantic, Burlington, Ocean	18 min
Jul 9, 3:51 AM EDT	Special Marine Warning	PHI		84 min
Jul 9, 4:08 AM EDT	Gale Warning	PHI		3 hr
Jul 9, 4:41 AM EDT	Tornado Warning	PHI	Monmouth, Ocean	34 min
Jul 9, 4:44 AM EDT	Areal Flood Advisory	PHI	Mercer, Middlesex	5 hr
Jul 9, 4:54 AM EDT	Areal Flood Advisory	PHI	Morris, Somerset	5 hr
Jul 9, 4:58 AM EDT	Special Marine Warning	PHI		39 min
Jul 9, 5:34 PM EDT	Areal Flood Advisory	PHI	Sussex, Warren	2 hr
Jul 9, 6:19 PM EDT	Severe Thunderstorm Warning	PHI	Salem	41 min
Jul 9, 6:24 PM EDT	Special Marine Warning	PHI		66 min
Jul 9, 6:50 PM EDT	Areal Flood Advisory	PHI	Gloucester, Salem	2 hr
Jul 9, 6:57 PM EDT	Severe Thunderstorm Warning	PHI	Cumberland, Gloucester, Salem	63 min
Jul 9, 7:17 PM EDT	Severe Thunderstorm Warning	PHI	Camden, Gloucester	23 min
Jul 9, 7:39 PM EDT	Areal Flood Advisory	PHI	Hunterdon, Morris, Sussex, Warren	2 hr
Jul 9, 7:43 PM EDT	Severe Thunderstorm Warning	PHI	Atlantic, Camden, Cape May, Cumberland, Gloucester, Salem	62 min
Jul 9, 7:46 PM EDT	Areal Flood Advisory	PHI	Atlantic, Camden, Cumberland, Gloucester, Salem	108 min
Jul 9, 5:17 PM EDT	Severe Thunderstorm Warning	PHI	Chester, Delaware	43 min
Jul 9, 6:55 PM EDT	Special Weather Statement	PHI	Carbon	35 min
Jul 9, 7:07 PM EDT	Areal Flood Advisory	PHI	Carbon, Lehigh, Monroe, Northampton	3 hr
Jul 9, 7:31 PM EDT	Special Weather Statement	PHI	Northampton	29 min
Jul 8, 10:19 PM EDT	Areal Flood Advisory	PHI	Kent, Sussex	5 hr
Jul 8, 11:37 PM EDT	Tornado Warning	PHI	Sussex	23 min
Jul 8, 11:59 PM EDT	Tornado Warning	PHI	Sussex	12 min
Jul 9, 12:04 AM EDT	Tornado Warning	PHI	Sussex	26 min
Jul 9, 12:11 AM EDT	Tornado Warning	PHI	Sussex	35 min
Jul 9, 12:28 AM EDT	Tornado Warning	PHI	Sussex	17 min
Jul 9, 4:52 PM EDT	Special Weather Statement	PHI	Queen Anne's, Talbot	53 min
Jul 9, 5:26 PM EDT	Severe Thunderstorm Warning	PHI	Caroline, Queen Anne's, Talbot	49 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.