Alert archive / Delaware / Severe Thunderstorm Warnings in 2019

Severe Thunderstorm Warning 175, NWS Philadelphia/Mount Holly

June 29, 2019Kent County, New Castle County, Delaware; Cecil County, Kent County, Maryland

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Jun 29, 2019, 4:38 PM EDT for Kent County, New Castle County, Delaware; Cecil County, Kent County, Maryland. It was in force for 52 min. 4 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: Jun 29, 2019, 4:38 PM EDT (20:38 UTC)
Expired: Jun 29, 2019, 5:30 PM EDT
In force: 52 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon
Hail: 1.0 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 20:38 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
Jun 29, 4:40 PM EDT	TSTM WND DMG	1 Wsw Middletown, DE	SEVERAL REPORTS OF TREE DAMAGE IN THE MIDDLETOWN AREA. TIME ESTIMATED FROM RADAR.
Jun 29, 4:42 PM EDT	TSTM WND DMG	Odessa, DE	MPING REPORT OF TREE LIMBS DOWN AND PROPERTY DAMAGE FROM THUNDERSTORM WINDS AT THIS LOCATION. TIME ESTIMATED FROM RADAR.
Jun 29, 5:02 PM EDT	HAIL 0.25	1 E Wyoming, DE
Jun 29, 5:14 PM EDT	HAIL 1	Dover, DE	PEA TO QUARTER SIZE HAIL FELL FROM 5:14 TO 5:22 PM.

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
Jun 29, 12:08 PM EDT	Severe Thunderstorm Watch	SPC	9 hr
Jun 29, 2:04 PM EDT	Severe Thunderstorm Watch	SPC	7 hr

The nearest sounding before it

Wallops Is Stn, VA (KWAL), launched 12:00Z, 8.6 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: 783 J/kg
Mixed-layer CIN: -114 J/kg
Mixed-layer LCL: 1214 m above ground
0-6 km bulk shear: 14 kt
0-1 km storm-relative helicity: 53 m²/s²
0-3 km storm-relative helicity: 17 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

406 
WUUS51 KPHI 292038
SVRPHI
DEC001-003-MDC015-029-292130-
/O.NEW.KPHI.SV.W.0175.190629T2038Z-190629T2130Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mount Holly NJ
438 PM EDT Sat Jun 29 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 530 PM EDT.

* At 437 PM EDT, severe thunderstorms were located along a line
  extending from Port Penn to Warwick, moving southeast at 30 mph.

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

  SOURCE...Radar indicated.

  IMPACT...Minor damage to vehicles is possible. Wind damage to 
           roofs, siding, trees, and power lines is possible.

* Locations impacted include...
  Dover, Middletown, Smyrna, Camden, Clayton, Delaware City,
  Cheswold, Cecilton, Hartly, Warwick, Bohemias Mills, Hazlettville,
  Port Penn, Delaney Corner, Dover Base Housing, Dover Speedway,
  Saint Georges, Sassafras, Mount Pleasant and Green Spring.

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 these storms. Move indoors
immediately. Remember, if you can hear thunder, you are close enough
to be struck by lightning.

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

&&

LAT...LON 3959 7559 3956 7556 3952 7557 3951 7556
      3949 7559 3944 7558 3935 7549 3933 7550
      3931 7544 3925 7540 3914 7541 3904 7566
      3920 7576 3924 7575 3925 7579 3948 7593
TIME...MOT...LOC 2037Z 327DEG 27KT 3953 7554 3941 7579 

HAIL...1.00IN
WIND...60MPH
 
$$

Staarmann

2 follow-up statements

467 
WWUS51 KPHI 292102
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
502 PM EDT Sat Jun 29 2019

MDC015-029-292112-
/O.CAN.KPHI.SV.W.0175.000000T0000Z-190629T2130Z/
Kent MD-Cecil MD-
502 PM EDT Sat Jun 29 2019

...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN KENT AND
SOUTHEASTERN CECIL COUNTIES IS CANCELLED...

The storms which prompted the warning have moved out of the warned 
area. Therefore, the warning has been cancelled.

A severe thunderstorm watch remains in effect until 700 PM EDT for
northern Delaware. A severe thunderstorm watch also remains in effect
until 700 PM EDT for central Delaware.

LAT...LON 3938 7562 3943 7557 3935 7549 3933 7550
      3931 7544 3925 7540 3924 7541 3922 7540
      3914 7541 3904 7566 3919 7575 3924 7575
      3930 7576
TIME...MOT...LOC 2102Z 327DEG 27KT 3938 7549 3930 7555 3922 7571 

$$

DEC001-003-292130-
/O.CON.KPHI.SV.W.0175.000000T0000Z-190629T2130Z/
New Castle DE-Kent DE-
502 PM EDT Sat Jun 29 2019

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 530 PM EDT
FOR SOUTH CENTRAL NEW CASTLE AND NORTHERN KENT COUNTIES...

At 502 PM EDT, severe thunderstorms were located along a line
extending from near Woodland Beach to near Smyrna to near Hartly,
moving southeast at 30 mph.

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

SOURCE...Radar indicated.

IMPACT...Minor damage to vehicles is possible. Wind damage to roofs, 
         siding, trees, and power lines is possible.

Locations impacted include...
Dover, Smyrna, Camden, Clayton, Cheswold, Hartly, Green Spring,
Hazlettville, Delaney Corner, Dover Base Housing, Dover Speedway,
Rising Sun, Rising Sun-Lebanon, Wyoming, Kenton, Little Creek,
Leipsic, Chambersville, Rodney Village and Kent Acres.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

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

&&

LAT...LON 3938 7562 3943 7557 3935 7549 3933 7550
      3931 7544 3925 7540 3924 7541 3922 7540
      3914 7541 3904 7566 3919 7575 3924 7575
      3930 7576
TIME...MOT...LOC 2102Z 327DEG 27KT 3938 7549 3930 7555 3922 7571 

HAIL...1.00IN
WIND...60MPH
 
$$

Staarmann

246 
WWUS51 KPHI 292121
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
521 PM EDT Sat Jun 29 2019

DEC003-292130-
/O.CAN.KPHI.SV.W.0175.000000T0000Z-190629T2130Z/
New Castle DE-
521 PM EDT Sat Jun 29 2019

...THE SEVERE THUNDERSTORM WARNING FOR SOUTH CENTRAL NEW CASTLE
COUNTY IS CANCELLED...

The storms which prompted the warning have moved out of the warned 
area. Therefore, the warning has been cancelled.

A severe thunderstorm watch remains in effect until 700 PM EDT for
central Delaware.

LAT...LON 3918 7575 3923 7554 3924 7544 3925 7540
      3924 7541 3922 7540 3914 7541 3904 7566
TIME...MOT...LOC 2120Z 328DEG 30KT 3920 7532 3913 7544 3911 7562 

$$

DEC001-292130-
/O.CON.KPHI.SV.W.0175.000000T0000Z-190629T2130Z/
Kent DE-
521 PM EDT Sat Jun 29 2019

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 530 PM EDT
FOR CENTRAL KENT COUNTY...

At 520 PM EDT, severe thunderstorms were located along a line
extending from 8 miles west of Fortesque to near Dover Base Housing
to Hazlettville, moving southeast at 35 mph.

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

SOURCE...Radar indicated.

IMPACT...Minor damage to vehicles is possible. Wind damage to roofs, 
         siding, trees, and power lines is possible.

Locations impacted include...
Dover, Camden, Cheswold, Hartly, Hazlettville, Dover Base Housing,
Dover Speedway, Rising Sun, Rising Sun-Lebanon, Wyoming, Little
Creek, Rodney Village, Kent Acres and Highland Acres.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

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

&&

LAT...LON 3918 7575 3923 7554 3924 7544 3925 7540
      3924 7541 3922 7540 3914 7541 3904 7566
TIME...MOT...LOC 2120Z 328DEG 30KT 3920 7532 3913 7544 3911 7562 

HAIL...1.00IN
WIND...60MPH
 
$$

Staarmann

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 29, 2:33 PM EDT	Special Weather Statement	PHI	Kent	27 min
Jun 29, 2:47 PM EDT	Severe Thunderstorm Warning	PHI	New Castle	28 min
Jun 29, 2:57 PM EDT	Special Weather Statement	PHI	Kent	33 min
Jun 29, 3:06 PM EDT	Severe Thunderstorm Warning	PHI	Kent	39 min
Jun 29, 3:13 PM EDT	Severe Thunderstorm Warning	PHI	New Castle	8 min
Jun 29, 3:24 PM EDT	Severe Thunderstorm Warning	PHI	New Castle	36 min
Jun 29, 3:39 PM EDT	Special Weather Statement	PHI	New Castle	51 min
Jun 29, 3:59 PM EDT	Severe Thunderstorm Warning	PHI	New Castle	46 min
Jun 29, 4:00 PM EDT	Flash Flood Warning	PHI	New Castle	3 hr
Jun 29, 4:24 PM EDT	Severe Thunderstorm Warning	PHI	Kent	36 min
Jun 29, 4:52 PM EDT	Severe Thunderstorm Warning	PHI	Kent, Sussex	38 min
Jun 29, 4:55 PM EDT	Severe Thunderstorm Warning	PHI	Kent	50 min
Jun 29, 5:26 PM EDT	Severe Thunderstorm Warning	PHI	Kent, Sussex	79 min
Jun 29, 5:38 PM EDT	Areal Flood Advisory	PHI	Kent	109 min
Jun 29, 6:38 PM EDT	Special Weather Statement	PHI	Sussex	52 min
Jun 29, 1:19 PM EDT	Special Weather Statement	PHI	Cecil	26 min
Jun 29, 1:26 PM EDT	Severe Thunderstorm Warning	PHI	Cecil, Kent	49 min
Jun 29, 2:08 PM EDT	Areal Flood Advisory	PHI	Cecil	3 hr
Jun 29, 2:12 PM EDT	Special Weather Statement	PHI	Cecil	33 min
Jun 29, 2:44 PM EDT	Special Weather Statement	PHI	Cecil	31 min
Jun 29, 3:27 PM EDT	Severe Thunderstorm Warning	PHI	Cecil	53 min
Jun 29, 4:14 PM EDT	Severe Thunderstorm Warning	PHI	Caroline, Kent, Queen Anne's	46 min
Jun 29, 4:58 PM EDT	Severe Thunderstorm Warning	PHI	Kent, Queen Anne's, Talbot	47 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.