Alert archive / Delaware / Special Weather Statements in 2015

Special Weather Statement, NWS Philadelphia/Mount Holly

July 21, 2015Sussex County, Delaware

NWS Philadelphia/Mount Holly issued this special weather statement at Jul 21, 2015, 1:54 PM EDT for Sussex 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 21, 2015, 1:54 PM EDT (17:54 UTC)
Expired: Jul 21, 2015, 2:30 PM EDT
In force: 36 min
Issued by: NWS Philadelphia/Mount Holly

County Sussex County, DE

The radar

The Dover AFB radar (KDOX), 22 km from the middle of the area, began a volume at 17:57 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

Wallops Is Stn, VA (KWAL), launched 12:00Z, 5.9 hours before the alert went out and 82 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: 899 J/kg
Mixed-layer CIN: -39 J/kg
Mixed-layer LCL: 1187 m above ground
0-6 km bulk shear: 27 kt
0-1 km storm-relative helicity: -12 m²/s²
0-3 km storm-relative helicity: 28 m²/s²
Significant tornado parameter: -0.0
Supercell composite: -0.3

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

438 
WWUS81 KPHI 211754
SPSPHI

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
154 PM EDT TUE JUL 21 2015
 
DEZ003-MDZ020-211830-
INLAND SUSSEX-CAROLINE-
154 PM EDT TUE JUL 21 2015

...A STRONG THUNDERSTORM WILL AFFECT SUSSEX AND SOUTHEASTERN CAROLINE
COUNTIES...

AT 153 PM EDT...A STRONG THUNDERSTORM WAS OVER SHARPTOWN...OR 8 MILES
SOUTHEAST OF HURLOCK...MOVING NORTHEAST AT 40 MPH.

WIND GUSTS UP TO 40 MPH AND PEA SIZE HAIL ARE POSSIBLE WITH THIS
STORM.

THIS STORM WILL BE NEAR...
  SEAFORD AND LAUREL AROUND 205 PM EDT.
  BRIDGEVILLE AND SYCAMORE AROUND 210 PM EDT.
  GEORGETOWN AROUND 220 PM EDT.
  ELLENDALE AROUND 225 PM EDT.
  MILTON AROUND 230 PM EDT.

OTHER LOCATIONS IMPACTED BY THIS STORM INCLUDE BLADES AND BETHEL.

FREQUENT CLOUD TO GROUND LIGHTNING IS OCCURRING WITH THIS STORM.
LIGHTNING CAN STRIKE 15 MILES AWAY FROM A THUNDERSTORM. SEEK A SAFE
SHELTER INSIDE A BUILDING OR VEHICLE.

LAT...LON 3864 7571 3868 7576 3890 7535 3862 7519
      3847 7569
TIME...MOT...LOC 1753Z 237DEG 37KT 3858 7574 
$$

MWG

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 21, 1:20 PM EDT	Special Marine Warning	PHI		25 min
Jul 21, 1:37 PM EDT	Special Marine Warning	PHI		83 min
Jul 21, 2:11 PM EDT	Special Weather Statement	PHI	Atlantic	34 min
Jul 21, 2:16 PM EDT	Special Marine Warning	PHI		89 min
Jul 21, 4:15 PM EDT	Special Weather Statement	PHI	Hunterdon	45 min
Jul 21, 5:36 PM EDT	Special Weather Statement	PHI	Sussex	24 min
Jul 21, 6:02 PM EDT	Special Weather Statement	PHI	Sussex	28 min
Jul 21, 6:12 PM EDT	Special Weather Statement	PHI	Monmouth	33 min
Jul 21, 6:25 PM EDT	Special Weather Statement	PHI	Morris	35 min
Jul 21, 3:35 PM EDT	Special Weather Statement	PHI	Northampton	40 min
Jul 21, 6:09 PM EDT	Special Weather Statement	PHI	Berks, Lehigh, Northampton	36 min
Jul 21, 6:38 PM EDT	Special Weather Statement	PHI	Bucks	22 min
Jul 21, 6:48 PM EDT	Special Weather Statement	PHI	Berks, Lehigh	27 min
Jul 21, 7:04 PM EDT	Special Weather Statement	PHI	Bucks	26 min
Jul 21, 12:50 PM EDT	Special Weather Statement	PHI	Sussex	25 min
Jul 21, 1:01 PM EDT	Areal Flood Advisory	PHI	Sussex	3 hr
Jul 21, 2:22 PM EDT	Areal Flood Advisory	PHI	Sussex	3 hr
Jul 21, 2:31 PM EDT	Special Weather Statement	PHI	Sussex	44 min
Jul 21, 3:01 PM EDT	Flash Flood Warning	PHI	Sussex	4 hr

Nearby

Special Weather Statements in Delaware, 2015 Every special weather statement in 2015

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.