Alert archive / Delaware / Severe Thunderstorm Warnings in 2019

Severe Thunderstorm Warning 155, NWS Philadelphia/Mount Holly

June 29, 2019New Castle County, Delaware

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Jun 29, 2019, 3:13 PM EDT for New Castle County, Delaware. It was in force for 8 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: Jun 29, 2019, 3:13 PM EDT (19:13 UTC)
Expired: Jun 29, 2019, 3:21 PM EDT
In force: 8 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

County New Castle County, DE

The radar

The Dover AFB radar (KDOX), 75 km from the middle of the area, began a volume at 19:17 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 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

The nearest sounding before it

Washington/Dulle, VA (KIAD), launched 12:00Z, 7.2 hours before the alert went out and 164 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: 927 J/kg
Mixed-layer CIN: -115 J/kg
Mixed-layer LCL: 1390 m above ground
0-6 km bulk shear: 19 kt
0-1 km storm-relative helicity: -10 m²/s²
0-3 km storm-relative helicity: 2 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

662 
WUUS51 KPHI 291913
SVRPHI
DEC003-291945-
/O.NEW.KPHI.SV.W.0155.190629T1913Z-190629T1945Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mount Holly NJ
313 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...

* Until 345 PM EDT.

* At 313 PM EDT, a severe thunderstorm was located over Mount
  Pleasant, or near Middletown, moving east at 10 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...
  Middletown, Delaware City, Saint Georges, Port Penn, Mount Pleasant
  and Odessa.

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.

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

&&

LAT...LON 3955 7578 3957 7557 3952 7557 3951 7556
      3949 7559 3946 7559 3944 7557 3944 7558
      3942 7555 3941 7555 3945 7577
TIME...MOT...LOC 1913Z 274DEG 10KT 3951 7571 

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

Staarmann

1 follow-up statement

281 
WWUS51 KPHI 291921
SVSPHI

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

DEC003-291931-
/O.CAN.KPHI.SV.W.0155.000000T0000Z-190629T1945Z/
New Castle DE-
321 PM EDT Sat Jun 29 2019

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHWESTERN NEW CASTLE COUNTY
IS CANCELLED...
                
The storm which prompted the warning has weakened below severe
limits, and no longer poses an immediate threat to life or property.
Therefore, the warning has been cancelled.  However small hail, gusty
winds, and heavy rain are still possible with this thunderstorm.

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

LAT...LON 3955 7578 3957 7557 3952 7557 3951 7556
      3949 7559 3946 7559 3944 7557 3944 7558
      3942 7555 3941 7555 3945 7577
TIME...MOT...LOC 1919Z 274DEG 10KT 3951 7568 

$$

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, 3:24 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, 4:38 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.