Alert archive / Delaware / Severe Thunderstorm Warnings in 2019

Severe Thunderstorm Warning 13, NWS Philadelphia/Mount Holly

April 15, 2019Sussex County, Delaware

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Apr 15, 2019, 3:28 AM EDT for Sussex County, Delaware. It was in force for 47 min. 7 reports came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued: Apr 15, 2019, 3:28 AM EDT (07:28 UTC)
Expired: Apr 15, 2019, 4:15 AM EDT
In force: 47 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon
Tornado: Possible
Hail: 0.75 in
Wind: 60.0 mph

County Sussex County, DE

The radar

The Dover AFB radar (KDOX), 13 km from the middle of the area, began a volume at 07:29 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.

What was reported inside it

Time	Report	Where	Remark
Apr 15, 3:38 AM EDT	TORNADO	1 E Bethel, DE	* 1 INJ * A TORNADO CAUSED DAMAGE ALONG A PATH FROM LAUREL TO SEAFORD DELAWARE. A TREE FELL ON A HOUSE, CAUSING ONE INJURY. ONE BARN WAS DESTROYED. THERE WAS ROOF DAMAGE TO SEVERAL OTHER HOMES AND BARNS. MANY TREES WERE UPROOTED ALONG THE PATH AND A FEW WE
Apr 15, 3:38 AM EDT	TORNADO	1 E Bethel, DE	* 1 INJ * EF2 TORNADO CONFIRMED WITH ESTIMATED MAXIMUM WINDS OF 120 MPH. A TORNADO CAUSED DAMAGE ALONG A PATH FROM LAUREL TO SEAFORD DELAWARE. A TREE FELL ON A HOUSE, CAUSING ONE INJURY. ONE BARN WAS DESTROYED. THERE WAS ROOF DAMAGE TO SEVERAL OTHER HOMES
Apr 15, 3:40 AM EDT	TSTM WND GST 50	Seaford, DE
Apr 15, 3:40 AM EDT	TSTM WND GST 55	Laurel, DE
Apr 15, 3:45 AM EDT	TSTM WND DMG	3 Nne Seaford, DE	CORRECTS PREVIOUS TSTM WND DMG REPORT FROM 3 NNE SEAFORD. US 13 NB & SB BETWEEN CAMP RD AND BOYCE RD IS CLOSED DUE TO WIRES DOWN. TIME ESTIMATED FROM RADAR.
Apr 15, 3:45 AM EDT	TSTM WND DMG	3 Nne Seaford, DE	US 13 NB & SB BETWEEN CAMP RD AND BOYCE RD IS CLOSED DUE TO WIRES DOWN. TIME ESTIMATED FROM RADAR.
Apr 15, 3:59 AM EDT	TSTM WND DMG	2 N Harbeson, DE	ROOF DAMAGE TO A MOBILE HOME AND SHED. TIME ESTIMATED FROM RADAR.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Apr 15, 1:05 AM EDT	Tornado Watch	SPC	5 hr

The nearest sounding before it

Wallops Is Stn, VA (KWAL), launched 00:00Z, 7.5 hours before the alert went out and 90 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: 124 J/kg
Mixed-layer CIN: -158 J/kg
Mixed-layer LCL: 806 m above ground
0-6 km bulk shear: 64 kt
0-1 km storm-relative helicity: 196 m²/s²
0-3 km storm-relative helicity: 209 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.1

Open this sounding in Storm Lab

The text

As transmitted.

543 
WUUS51 KPHI 150728
SVRPHI
DEC005-150815-
/O.NEW.KPHI.SV.W.0013.190415T0728Z-190415T0815Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mount Holly NJ
328 AM EDT MON APR 15 2019

The National Weather Service in Mount Holly NJ has issued a

* Severe Thunderstorm Warning for...
  Sussex County in southern Delaware...

* Until 415 AM EDT.

* At 328 AM EDT, a severe thunderstorm was located over Sharptown, or
  10 miles southeast of Hurlock, moving northeast at 50 mph.

  HAZARD...60 mph wind gusts.

  SOURCE...Radar indicated.

  IMPACT...Damage to roofs, siding, trees, and power lines is 
           possible.

* Locations impacted include...
  Georgetown, Milford, Seaford, Millsboro, Laurel, Delmar, Lewes,
  Milton, Bridgeville, Dagsboro, Ellendale, Henlopen Acres, Sycamore,
  Long Neck, Blades, Dewey Beach and Bethel.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

To report severe weather, contact your nearest law enforcement
agency. They will send your report to the National Weather Service
office in Mount Holly NJ.

Torrential rainfall is occurring with this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.

&&

A tornado watch remains in effect until 700 AM EDT for central and
southern Delaware.

LAT...LON 3846 7569 3868 7571 3895 7533 3895 7532
      3897 7531 3892 7528 3881 7514 3881 7512
      3873 7505 3862 7504 3845 7554
TIME...MOT...LOC 0728Z 229DEG 46KT 3854 7571 

TORNADO...POSSIBLE
HAIL...<.75IN
WIND...60MPH
 
$$

MPS

1 follow-up statement

186 
WWUS51 KPHI 150806
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
406 AM EDT MON APR 15 2019

DEC005-150815-
/O.EXP.KPHI.SV.W.0013.000000T0000Z-190415T0815Z/
Sussex DE-
406 AM EDT MON APR 15 2019

...THE SEVERE THUNDERSTORM WARNING FOR SUSSEX COUNTY WILL EXPIRE AT
415 AM EDT...
        
The storm which prompted the warning has moved out of the area.
Therefore, the warning will be allowed to expire.  However gusty
winds and heavy rain are still possible with this thunderstorm.

A tornado watch remains in effect until 700 AM EDT for central and
southern Delaware.

To report severe weather, contact your nearest law enforcement
agency. They will relay your report to the National Weather Service
in Mount Holly NJ.

LAT...LON 3846 7569 3868 7571 3895 7533 3895 7532
      3897 7531 3892 7528 3881 7514 3881 7512
      3873 7505 3862 7504 3845 7554
TIME...MOT...LOC 0805Z 229DEG 46KT 3884 7526 

$$

MPS

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 15, 2:46 AM EDT	Severe Thunderstorm Warning	PHI	New Castle	44 min
Apr 15, 3:07 AM EDT	Severe Thunderstorm Warning	PHI	Kent, New Castle, Sussex	38 min
Apr 15, 3:19 AM EDT	Tornado Warning	PHI	New Castle	26 min
Apr 15, 3:19 AM EDT	Wind Advisory	PHI	Kent, New Castle, Sussex	18 hr
Apr 15, 3:21 AM EDT	Tornado Warning	PHI	Kent	24 min
Apr 15, 3:31 AM EDT	Tornado Warning	PHI	Sussex	29 min
Apr 15, 3:36 AM EDT	Tornado Warning	PHI	Kent, Sussex	24 min
Apr 15, 3:41 AM EDT	Severe Thunderstorm Warning	PHI	Kent, Sussex	64 min
Apr 15, 3:59 AM EDT	Areal Flood Advisory	PHI	Kent, Sussex	4 hr
Apr 15, 4:19 AM EDT	Special Weather Statement	PHI	Sussex	26 min

Nearby

Severe Thunderstorm Warnings in Delaware, 2019 Every severe thunderstorm warning in 2019

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.