Alert archive / Delaware / Severe Thunderstorm Warnings in 2019

Severe Thunderstorm Warning 390, NWS Philadelphia/Mount Holly

September 4, 2019Kent County, New Castle County, Delaware; Cecil County, Kent County, Maryland

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Sep 4, 2019, 8:13 PM EDT for Kent County, New Castle County, Delaware; Cecil County, Kent County, Maryland. It was in force for 62 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: Sep 4, 2019, 8:13 PM EDT (00:13 UTC)
Expired: Sep 4, 2019, 9:15 PM EDT
In force: 62 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

Counties Kent County, DE, New Castle County, DE, Cecil County, MD, Kent County, MD

The radar

The Dover AFB radar (KDOX), 62 km from the middle of the area, began a volume at 00:15 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 00:00Z, 0.2 hours before the alert went out and 161 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: 1255 J/kg
Mixed-layer CIN: -8 J/kg
Mixed-layer LCL: 1741 m above ground
0-6 km bulk shear: 22 kt
0-1 km storm-relative helicity: 3 m²/s²
0-3 km storm-relative helicity: 56 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.9

Open this sounding in Storm Lab

The text

As transmitted.

357 
WUUS51 KPHI 050013
SVRPHI
DEC001-003-MDC015-029-050115-
/O.NEW.KPHI.SV.W.0390.190905T0013Z-190905T0115Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mount Holly NJ
813 PM EDT Wed Sep 4 2019

The National Weather Service in Mount Holly NJ has issued a

* Severe Thunderstorm Warning for...
  Southwestern New Castle County in northern Delaware...
  Northern Kent County in central Delaware...
  Northeastern Kent County in northeastern Maryland...
  Southeastern Cecil County in northeastern Maryland...

* Until 915 PM EDT.

* At 813 PM EDT, a severe thunderstorm was located over Warwick, or
  near Middletown, moving east at 20 mph.

  HAZARD...60 mph wind gusts and penny size hail.

  SOURCE...Radar indicated.

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

* Locations impacted include...
  Dover, Middletown, Smyrna, Clayton, Cheswold, Cecilton, Warwick,
  Sassafras, Green Spring, Bohemias Mills, Delaney Corner, Massey,
  Dover Speedway, Woodland Beach, Dover Base Housing, Townsend,
  Galena, Odessa, Kenton and Little Creek.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

In addition to large hail and damaging winds, frequent cloud to
ground lightning is occurring with this storm. Move indoors
immediately. Remember, if you can hear thunder, you are close enough
to be struck by lightning.

&&

LAT...LON 3944 7591 3950 7579 3948 7559 3944 7558
      3941 7554 3937 7552 3935 7549 3933 7550
      3934 7549 3931 7543 3924 7540 3911 7549
      3937 7596
TIME...MOT...LOC 0013Z 290DEG 18KT 3942 7582 

HAIL...0.75IN
WIND...60MPH
 
$$

Staarmann

2 follow-up statements

707 
WWUS51 KPHI 050042
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
842 PM EDT Wed Sep 4 2019

MDC015-029-050052-
/O.CAN.KPHI.SV.W.0390.000000T0000Z-190905T0115Z/
Kent MD-Cecil MD-
842 PM EDT Wed Sep 4 2019

...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN KENT AND
SOUTHEASTERN CECIL COUNTIES IS CANCELLED...
    
The severe thunderstorm which prompted the warning has moved out of 
the warned area. Therefore, the warning has been cancelled.

LAT...LON 3948 7560 3944 7558 3935 7549 3933 7550
      3934 7548 3931 7544 3925 7540 3911 7549
      3920 7562 3919 7563 3920 7563 3929 7576
      3940 7577
TIME...MOT...LOC 0042Z 285DEG 20KT 3940 7555 

$$

DEC001-003-050115-
/O.CON.KPHI.SV.W.0390.000000T0000Z-190905T0115Z/
New Castle DE-Kent DE-
842 PM EDT Wed Sep 4 2019

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 915 PM EDT
FOR SOUTHWESTERN NEW CASTLE AND NORTHERN KENT COUNTIES...

At 842 PM EDT, a severe thunderstorm was located near Hope Creek, or
9 miles east of Middletown, moving east at 25 mph.

HAZARD...60 mph wind gusts and penny size hail.

SOURCE...Radar indicated.

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

Locations impacted include...
Dover, Middletown, Smyrna, Clayton, Cheswold, Woodland Beach, Green
Spring, Delaney Corner, Dover Speedway, Dover Base Housing, Townsend,
Odessa, Kenton, Little Creek, Leipsic, Chambersville and Kent Acres.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3948 7560 3944 7558 3935 7549 3933 7550
      3934 7548 3931 7544 3925 7540 3911 7549
      3920 7562 3919 7563 3920 7563 3929 7576
      3940 7577
TIME...MOT...LOC 0042Z 285DEG 20KT 3940 7555 

HAIL...0.75IN
WIND...60MPH
 
$$

Staarmann

493 
WWUS51 KPHI 050102
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
902 PM EDT Wed Sep 4 2019

DEC001-003-050115-
/O.CON.KPHI.SV.W.0390.000000T0000Z-190905T0115Z/
New Castle DE-Kent DE-
902 PM EDT Wed Sep 4 2019

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 915 PM EDT
FOR SOUTH CENTRAL NEW CASTLE AND NORTHEASTERN KENT COUNTIES...

At 902 PM EDT, a severe thunderstorm was located over Woodland Beach,
or 12 miles north of Dover, moving east at 20 mph.

HAZARD...60 mph wind gusts and penny size hail.

SOURCE...Radar indicated.

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

Locations impacted include...
Smyrna, Woodland Beach and Chambersville. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3929 7562 3940 7559 3940 7554 3935 7549
      3933 7550 3934 7548 3931 7544 3925 7540
      3922 7542
TIME...MOT...LOC 0102Z 278DEG 19KT 3933 7552 

HAIL...0.75IN
WIND...60MPH
 
$$

Staarmann

The office that day

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

Issued	Product	Office	Counties	Lasted
Sep 5, 3:44 AM EDT	Rip Current Statement	PHI	Sussex	41 hr
Sep 5, 3:22 PM EDT	High Surf Advisory	PHI	Sussex	42 hr
Sep 4, 10:03 PM EDT	Special Weather Statement	PHI	Queen Anne's	42 min

Nearby

Severe Thunderstorm Warnings in Delaware, 2019 Severe Thunderstorm Warnings in Maryland, 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.