Alert archive / Delaware / Special Weather Statements in 2021

Special Weather Statement, NWS Philadelphia/Mount Holly

August 27, 2021New Castle County, Delaware

NWS Philadelphia/Mount Holly issued this special weather statement at Aug 27, 2021, 5:39 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: Aug 27, 2021, 5:39 PM EDT (21:39 UTC)
Expired: Aug 27, 2021, 6:15 PM EDT
In force: 36 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), 85 km from the middle of the area, began a volume at 21:39 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, 9.7 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: 780 J/kg
Mixed-layer CIN: -92 J/kg
Mixed-layer LCL: 983 m above ground
0-6 km bulk shear: 8 kt
0-1 km storm-relative helicity: 13 m²/s²
0-3 km storm-relative helicity: 41 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

864 
WWUS81 KPHI 272139
SPSPHI

Special Weather Statement
National Weather Service Mount Holly NJ
539 PM EDT Fri Aug 27 2021
 
DEZ001-272215-
New Castle DE-
539 PM EDT Fri Aug 27 2021

...A strong thunderstorm will impact portions of west central New
Castle County through 615 PM EDT...

At 539 PM EDT, Doppler radar was tracking a strong thunderstorm over
Mount Pleasant, or near Middletown, moving southeast at 5 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...
Middletown, Delaware City, Saint Georges, Port Penn, Mount Pleasant,
Glasgow, Bear and Odessa.

This includes Interstate 95 in Delaware near mile marker 0.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building. 

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 3964 7579 3964 7558 3945 7555 3945 7577
TIME...MOT...LOC 2139Z 299DEG 5KT 3952 7568 

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 27, 1:33 PM EDT	Areal Flood Advisory	PHI	Burlington, Camden	83 min
Aug 27, 2:18 PM EDT	Small Craft Advisory	PHI		44 hr
Aug 27, 2:28 PM EDT	Special Weather Statement	PHI	Atlantic	47 min
Aug 27, 2:33 PM EDT	Areal Flood Advisory	PHI	Warren	109 min
Aug 27, 2:37 PM EDT	Severe Thunderstorm Warning	PHI	Ocean	38 min
Aug 27, 2:38 PM EDT	Severe Thunderstorm Warning	PHI	Warren	35 min
Aug 27, 2:59 PM EDT	Severe Thunderstorm Warning	PHI	Ocean	46 min
Aug 27, 3:07 PM EDT	Severe Thunderstorm Warning	PHI	Warren	24 min
Aug 27, 3:16 PM EDT	Special Weather Statement	PHI	Burlington	44 min
Aug 27, 3:30 PM EDT	Severe Thunderstorm Warning	PHI	Burlington, Ocean	45 min
Aug 27, 3:38 PM EDT	Special Weather Statement	PHI	Camden	52 min
Aug 27, 3:45 PM EDT	Special Weather Statement	PHI	Ocean	30 min
Aug 27, 3:54 PM EDT	Special Weather Statement	PHI	Atlantic	51 min
Aug 27, 3:59 PM EDT	Special Weather Statement	PHI	Ocean	46 min
Aug 27, 4:06 PM EDT	Severe Thunderstorm Warning	PHI	Camden, Gloucester	39 min
Aug 27, 4:37 PM EDT	Areal Flood Advisory	PHI	Gloucester	106 min
Aug 27, 4:46 PM EDT	Special Marine Warning	PHI		43 min
Aug 27, 4:56 PM EDT	Special Weather Statement	PHI	Atlantic	34 min
Aug 27, 5:02 PM EDT	Severe Thunderstorm Warning	PHI	Atlantic, Cumberland	29 min
Aug 27, 5:09 PM EDT	Areal Flood Advisory	PHI	Atlantic, Cape May, Cumberland	2 hr
Aug 27, 5:21 PM EDT	Special Weather Statement	PHI	Middlesex	39 min
Aug 27, 5:29 PM EDT	Areal Flood Advisory	PHI	Hunterdon, Mercer, Middlesex, Monmouth, Somerset	3 hr
Aug 27, 5:44 PM EDT	Flash Flood Warning	PHI	Middlesex	4 hr
Aug 27, 6:52 PM EDT	Areal Flood Advisory	PHI	Salem	98 min
Aug 27, 1:20 PM EDT	Areal Flood Advisory	PHI	Carbon, Monroe	2 hr
Aug 27, 1:36 PM EDT	Special Weather Statement	PHI	Monroe	24 min
Aug 27, 1:52 PM EDT	Severe Thunderstorm Warning	PHI	Chester	53 min
Aug 27, 2:12 PM EDT	Special Weather Statement	PHI	Northampton	33 min
Aug 27, 2:18 PM EDT	Areal Flood Advisory	PHI	Chester	93 min
Aug 27, 2:32 PM EDT	Severe Thunderstorm Warning	PHI	Carbon, Monroe, Northampton	28 min
Aug 27, 2:42 PM EDT	Severe Thunderstorm Warning	PHI	Chester	14 min
Aug 27, 3:44 PM EDT	Special Weather Statement	PHI	Delaware	31 min
Aug 27, 6:29 PM EDT	Areal Flood Advisory	PHI	Berks	3 hr
Aug 27, 6:41 PM EDT	Special Weather Statement	PHI	Berks	34 min
Aug 27, 7:17 PM EDT	Flash Flood Warning	PHI	Berks	3 hr
Aug 27, 3:48 PM EDT	Areal Flood Advisory	PHI	New Castle	102 min
Aug 27, 5:11 PM EDT	Areal Flood Advisory	PHI	New Castle	3 hr
Aug 27, 6:10 PM EDT	Areal Flood Advisory	PHI	New Castle	2 hr
Aug 27, 7:10 PM EDT	Severe Thunderstorm Warning	PHI	Kent, Queen Anne's, Talbot	65 min
Aug 27, 7:37 PM EDT	Severe Thunderstorm Warning	PHI	Kent, Queen Anne's	34 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.