Alert archive / Delaware / Special Weather Statements in 2017

Special Weather Statement, NWS Philadelphia/Mount Holly

May 25, 2017New Castle County, Delaware

NWS Philadelphia/Mount Holly issued this special weather statement at May 25, 2017, 7:49 PM EDT for New Castle County, Delaware. It was in force for 26 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: May 25, 2017, 7:49 PM EDT (23:49 UTC)
Expired: May 25, 2017, 8:15 PM EDT
In force: 26 min
Issued by: NWS Philadelphia/Mount Holly

County New Castle County, DE

The radar

The Dover AFB radar (KDOX), 60 km from the middle of the area, began a volume at 23:50 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

Wallops Is Stn, VA (KWAL), launched 12:00Z, 11.8 hours before the alert went out and 160 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: 492 J/kg
Mixed-layer CIN: -9 J/kg
Mixed-layer LCL: 478 m above ground
0-6 km bulk shear: 64 kt
0-1 km storm-relative helicity: 206 m²/s²
0-3 km storm-relative helicity: 170 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.5

Open this sounding in Storm Lab

The text

As transmitted.

242 
WWUS81 KPHI 252349
SPSPHI

Special Weather Statement
National Weather Service Mount Holly NJ
749 PM EDT THU MAY 25 2017

DEZ001-002-MDZ008-012-NJZ016-021-260015-
Kent-New Castle-Cecil-Kent-Salem-Cumberland-
749 PM EDT THU MAY 25 2017

...A LINE OF STRONG THUNDERSTORMS WILL AFFECT SOUTHWESTERN NEW
CASTLE...NORTHERN KENT...NORTHEASTERN QUEEN ANNE'S...NORTHEASTERN
KENT...SOUTHEASTERN CECIL...WEST CENTRAL CUMBERLAND AND SOUTHWESTERN
SALEM COUNTIES...

At 749 PM EDT, radar indicated strong thunderstorms were located
along a line extending from near Sassafras to near Clayton to near
Dover Speedway. Movement was northeast at 30 mph.

Winds up to 40 mph and pea size hail are possible with these storms.

Locations impacted include...
Dover, Millville, Bridgeton, Middletown, Elkton, Smyrna, Clayton,
Cheswold, Greenwich, Cecilton, Shiloh, Warwick, Woodland Beach,
Glasgow, Bohemias Mills, Hancocks Bridge, Newport Meadows, Port Penn,
Brantwood and Delaney Corner.

Torrential rainfall is also occurring with these storms, and may
cause localized flooding. Do not drive your vehicle through flooded
roadways.

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.

These storms 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 3964 7582 3955 7557 3953 7556 3952 7554
      3953 7553 3939 7509 3927 7523 3930 7524
      3930 7527 3924 7541 3920 7540 3913 7541
      3918 7555 3917 7556 3927 7583 3934 7596
TIME...MOT...LOC 2349Z 225DEG 27KT 3934 7581 3925 7565 3921 7548 

$$

JRK

The office that day

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

Issued	Product	Office	Counties	Lasted
May 25, 5:12 PM EDT	Special Marine Warning	PHI		63 min
May 25, 5:15 PM EDT	Special Weather Statement	PHI	Cumberland	30 min
May 25, 5:29 PM EDT	Areal Flood Advisory	PHI	Camden, Cumberland, Gloucester, Salem	2 hr
May 25, 5:51 PM EDT	Special Weather Statement	PHI	Salem	24 min
May 25, 6:16 PM EDT	Special Weather Statement	PHI	Gloucester	29 min
May 25, 7:37 PM EDT	Special Marine Warning	PHI		38 min
May 25, 7:50 PM EDT	Special Marine Warning	PHI		55 min
May 25, 7:56 PM EDT	Severe Thunderstorm Warning	PHI	Cumberland, Salem	49 min
May 25, 5:42 PM EDT	Special Weather Statement	PHI	Philadelphia	33 min
May 25, 6:39 PM EDT	Special Weather Statement	PHI	Bucks	36 min
May 25, 5:48 PM EDT	Severe Thunderstorm Warning	PHI	Queen Anne's, Talbot	42 min
May 25, 6:26 PM EDT	Severe Thunderstorm Warning	PHI	Caroline, Kent, Queen Anne's, Talbot	49 min
May 25, 7:09 PM EDT	Severe Thunderstorm Warning	PHI	Cecil, Kent, Queen Anne's	51 min
May 25, 6:48 PM EDT	Special Weather Statement	PHI	Sussex	27 min
May 25, 7:13 PM EDT	Special Weather Statement	PHI	Kent	32 min

Nearby

Special Weather Statements in Delaware, 2017 Every special weather statement in 2017

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.