Alert archive / Delaware / Special Weather Statements in 2017

Special Weather Statement, NWS Philadelphia/Mount Holly

July 19, 2017Kent County, Delaware

NWS Philadelphia/Mount Holly issued this special weather statement at Jul 19, 2017, 3:21 PM EDT for Kent County, Delaware. It was in force for 24 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 19, 2017, 3:21 PM EDT (19:21 UTC)
Expired: Jul 19, 2017, 3:45 PM EDT
In force: 24 min
Issued by: NWS Philadelphia/Mount Holly

County Kent County, DE

The radar

The Dover AFB radar (KDOX), 46 km from the middle of the area, began a volume at 19:23 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, 7.4 hours before the alert went out and 145 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: 685 J/kg
Mixed-layer CIN: -65 J/kg
Mixed-layer LCL: 890 m above ground
0-6 km bulk shear: 5 kt
0-1 km storm-relative helicity: 5 m²/s²
0-3 km storm-relative helicity: 26 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

684 
WWUS81 KPHI 191921
SPSPHI

Special Weather Statement
National Weather Service Mount Holly NJ
321 PM EDT WED JUL 19 2017

DEZ002-191945-
Kent-
321 PM EDT WED JUL 19 2017

...A STRONG THUNDERSTORM WILL AFFECT NORTHEASTERN KENT COUNTY...

At 320 PM EDT, a strong thunderstorm was located near Cheswold, or
near Dover, moving southeast at 5 mph.

Wind gusts up to 30 mph and pea size hail are possible with this 
storm.

Heavy rainfall is also occurring with this storm...and may cause 
ponding on roadways and poor drainage areas. 

Frequent lightning is occurring with this storm. Lightning can 
strike 15 miles away from a thunderstorm. If you see lightning or 
hear thunder seek a safe shelter inside a building or vehicle.

Locations impacted include...
Dover, Camden, Cheswold, Dover Speedway, Wyoming, Little Creek,
Leipsic, Rodney Village, Kent Acres and Highland Acres.

LAT...LON 3931 7553 3924 7540 3918 7540 3911 7555
      3926 7561
TIME...MOT...LOC 1920Z 327DEG 5KT 3925 7553 

$$

Robertson

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 19, 1:04 PM EDT	Special Weather Statement	PHI	Ocean	26 min
Jul 19, 1:30 PM EDT	Special Weather Statement	PHI	Atlantic	30 min
Jul 19, 1:37 PM EDT	Areal Flood Advisory	PHI	Ocean	4 hr
Jul 19, 2:50 PM EDT	Special Weather Statement	PHI	Atlantic	25 min
Jul 19, 2:58 PM EDT	Excessive Heat Warning	PHI	Burlington, Camden, Gloucester, Mercer	53 hr
Jul 19, 3:22 PM EDT	Special Weather Statement	PHI	Atlantic	23 min
Jul 19, 3:46 PM EDT	Special Weather Statement	PHI	Atlantic	14 min
Jul 19, 3:56 PM EDT	Areal Flood Advisory	PHI	Atlantic	4 hr
Jul 19, 4:20 PM EDT	Special Weather Statement	PHI	Atlantic	25 min
Jul 19, 6:36 PM EDT	Special Weather Statement	PHI	Atlantic	54 min
Jul 19, 5:32 PM EDT	Special Weather Statement	PHI	Berks	58 min
Jul 19, 7:26 PM EDT	Special Weather Statement	PHI	Carbon, Monroe	64 min
Jul 19, 2:48 PM EDT	Special Weather Statement	PHI	Sussex	57 min
Jul 19, 3:07 PM EDT	Special Weather Statement	PHI	Kent	38 min
Jul 19, 3:37 PM EDT	Special Weather Statement	PHI	Kent	38 min
Jul 19, 3:42 PM EDT	Areal Flood Advisory	PHI	Kent	4 hr
Jul 19, 5:54 PM EDT	Special Weather Statement	PHI	Sussex	66 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.