Alert archive / Delaware / Special Weather Statements in 2023

Special Weather Statement, NWS Philadelphia/Mount Holly

July 20, 2023New Castle County, Delaware

NWS Philadelphia/Mount Holly issued this special weather statement at Jul 20, 2023, 2:09 PM EDT for New Castle County, Delaware. It was in force for 36 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 20, 2023, 2:09 PM EDT (18:09 UTC)
Expired: Jul 20, 2023, 2:45 PM EDT
In force: 36 min
Issued by: NWS Philadelphia/Mount Holly
Hail: 0.75 in
Wind: 40

County New Castle County, DE

The radar

The Dover AFB radar (KDOX), 99 km from the middle of the area, began a volume at 18:12 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, 6.2 hours before the alert went out and 168 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: 2 J/kg
Mixed-layer CIN: -200 J/kg
Mixed-layer LCL: 1313 m above ground
0-6 km bulk shear: 37 kt
0-1 km storm-relative helicity: 4 m²/s²
0-3 km storm-relative helicity: 29 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

291 
WWUS81 KPHI 201809
SPSPHI

Special Weather Statement
National Weather Service Mount Holly NJ
209 PM EDT Thu Jul 20 2023
 
DEZ001-201845-
New Castle DE-
209 PM EDT Thu Jul 20 2023

...A strong thunderstorm will impact portions of northwestern New
Castle County through 245 PM EDT...

At 208 PM EDT, Doppler radar was tracking a strong thunderstorm near
Bear, or near Newark, moving east at 20 mph.

HAZARD...Wind gusts up to 40 mph and penny 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, Elsmere, New Castle, Delaware City, Newport,
Saint Georges, Greenville, Stanton, North Star, Glasgow, Bear,
Wilmington Manor, Pike Creek, Hockessin and Brookside.

This includes Interstate 95 in Delaware between mile markers 2 and
13.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building. 

This storm may intensify, so be certain to monitor local radio
stations and available television stations for additional information
and possible warnings from the National Weather Service.

&&

LAT...LON 3975 7576 3976 7575 3981 7556 3953 7558
      3958 7577
TIME...MOT...LOC 1808Z 272DEG 16KT 3967 7567 

MAX HAIL SIZE...0.75 IN
MAX WIND GUST...40 MPH

$$

MPS

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 20, 2:11 PM EDT	Special Marine Warning	PHI		49 min
Jul 20, 1:53 PM EDT	Severe Thunderstorm Warning	PHI	Chester	40 min
Jul 20, 2:37 PM EDT	Areal Flood Advisory	PHI	New Castle	109 min
Jul 20, 2:48 PM EDT	Special Weather Statement	PHI	New Castle	27 min
Jul 20, 4:23 PM EDT	Special Weather Statement	PHI	Kent	37 min
Jul 20, 4:27 PM EDT	Special Weather Statement	PHI	Sussex	48 min

Nearby

Special Weather Statements in Delaware, 2023 Every special weather statement in 2023

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.