Alert archive / Delaware / Severe Thunderstorm Warnings in 2019

Severe Thunderstorm Warning 171, NWS Philadelphia/Mount Holly

June 29, 2019Kent County, Delaware

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Jun 29, 2019, 4:24 PM EDT for Kent County, Delaware. It was in force for 36 min. 2 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, 4:24 PM EDT (20:24 UTC)
Expired: Jun 29, 2019, 5:00 PM EDT
In force: 36 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

County Kent County, DE

The radar

The Dover AFB radar (KDOX), 23 km from the middle of the area, began a volume at 20:26 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, 4:24 PM EDT	HAIL 1	1 N Magnolia, DE	A TIN ROOF WAS DENTED FROM THE HAIL. TIME ESTIMATED FROM RADAR.
Jun 29, 5:02 PM EDT	HAIL 0.25	1 E Wyoming, DE

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, 2:04 PM EDT	Severe Thunderstorm Watch	SPC	7 hr

The nearest sounding before it

Wallops Is Stn, VA (KWAL), launched 12:00Z, 8.4 hours before the alert went out and 122 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.

431 
WUUS51 KPHI 292024
SVRPHI
DEC001-292100-
/O.NEW.KPHI.SV.W.0171.190629T2024Z-190629T2100Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mount Holly NJ
424 PM EDT Sat Jun 29 2019

The National Weather Service in Mount Holly NJ has issued a

* Severe Thunderstorm Warning for...
  East central Kent County in central Delaware...

* Until 500 PM EDT.

* At 424 PM EDT, a severe thunderstorm was located over Rising
  Sun-Lebanon, or near Dover, moving southeast at 25 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, Bowers, Rising Sun-Lebanon, Rising Sun, Dover Base
  Housing, Big Stone Beach, Wyoming, Magnolia, Rodney Village, Kent
  Acres, Highland Acres and Woodside East.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Frequent cloud to ground lightning is occurring with this storm, and
the storm will affect the beaches. For your safety, immediately move
off the beach and seek shelter indoors.

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

&&

LAT...LON 3895 7532 3895 7534 3909 7558 3917 7551
      3914 7541 3907 7541 3901 7533 3898 7531
      3894 7531
TIME...MOT...LOC 2024Z 294DEG 22KT 3908 7546 

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

Staarmann

1 follow-up statement

927 
WWUS51 KPHI 292049
SVSPHI

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

DEC001-292100-
/O.CON.KPHI.SV.W.0171.000000T0000Z-190629T2100Z/
Kent DE-
449 PM EDT Sat Jun 29 2019

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 500 PM EDT
FOR EAST CENTRAL KENT COUNTY...

At 448 PM EDT, a severe thunderstorm was located over Bowers, or 7
miles southeast of Dover, moving east at 15 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, Bowers, Dover Base Housing, Rising Sun-Lebanon, Big
Stone Beach, Rising Sun, Magnolia, Woodside East and Highland Acres.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Continuous cloud to ground lightning is occurring with this storm.
Move indoors immediately. Lightning is one of nature's leading
killers. Remember, if you can hear thunder, you are close enough to
be struck by lightning.

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

&&

LAT...LON 3895 7532 3895 7534 3909 7558 3914 7541
      3907 7541 3901 7533 3898 7531 3894 7531
TIME...MOT...LOC 2048Z 286DEG 15KT 3909 7540 

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, 4:38 PM EDT	Severe Thunderstorm Warning	PHI	Kent, New Castle	52 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

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.