Alert archive / Delaware / Severe Thunderstorm Warnings in 2019

Severe Thunderstorm Warning 210, NWS Philadelphia/Mount Holly

July 6, 2019Kent County, Sussex County, Delaware

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Jul 6, 2019, 6:00 PM EDT for Kent County, Sussex County, Delaware. It was in force for 29 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: Jul 6, 2019, 6:00 PM EDT (22:00 UTC)
Expired: Jul 6, 2019, 6:29 PM EDT
In force: 29 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon
Tornado: Possible
Hail: 0.75 in
Wind: 60.0 mph

Counties Kent County, DE, Sussex County, DE

The radar

The Dover AFB radar (KDOX), 7 km from the middle of the area, began a volume at 22:05 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

Wallops Is Stn, VA (KWAL), launched 12:00Z, 10.0 hours before the alert went out and 105 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: 858 J/kg
Mixed-layer CIN: -49 J/kg
Mixed-layer LCL: 755 m above ground
0-6 km bulk shear: 10 kt
0-1 km storm-relative helicity: 28 m²/s²
0-3 km storm-relative helicity: 57 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

956 
WUUS51 KPHI 062200
SVRPHI
DEC001-005-062245-
/O.NEW.KPHI.SV.W.0210.190706T2200Z-190706T2245Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mount Holly NJ
600 PM EDT Sat Jul 6 2019

The National Weather Service in Mount Holly NJ has issued a

* Severe Thunderstorm Warning for...
  Northwestern Sussex County in southern Delaware...
  Southeastern Kent County in central Delaware...

* Until 645 PM EDT.

* At 600 PM EDT, a severe thunderstorm was located near Harrington,
  or 15 miles northwest of Georgetown, moving northeast at 15 mph.

  HAZARD...60 mph wind gusts.

  SOURCE...Radar indicated.

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

* Locations impacted include...
  Milford, Harrington, Ellendale, Andrewsville, Greenwood, Frederica,
  Houston, Farmington and Riverview.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Remain alert for a possible tornado! Tornadoes can develop quickly
from severe thunderstorms. If you spot a tornado go at once into the
basement or small central room in a sturdy structure.

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

This thunderstorm is capable of producing all types of severe 
weather including destructive straight line winds and tornadoes. 
Move quickly to a safe shelter such as an interior room, a bathroom, 
closet or basement.

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

&&

LAT...LON 3876 7554 3889 7569 3906 7550 3887 7526
TIME...MOT...LOC 2200Z 230DEG 12KT 3888 7555 

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

MPS

1 follow-up statement

053 
WWUS51 KPHI 062229
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
629 PM EDT Sat Jul 6 2019

DEC001-005-062239-
/O.CAN.KPHI.SV.W.0210.000000T0000Z-190706T2245Z/
Sussex DE-Kent DE-
629 PM EDT Sat Jul 6 2019

...THE SEVERE THUNDERSTORM WARNING FOR NORTHWESTERN SUSSEX AND
SOUTHEASTERN KENT COUNTIES 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.

LAT...LON 3876 7554 3889 7569 3906 7550 3887 7526
TIME...MOT...LOC 2228Z 230DEG 12KT 3894 7545 

$$

Fitzsimmons

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 6, 3:55 PM EDT	Tornado Warning	PHI	New Castle	50 min
Jul 6, 5:04 PM EDT	Severe Thunderstorm Warning	PHI	New Castle	17 min
Jul 6, 5:49 PM EDT	Areal Flood Advisory	PHI	New Castle	4 hr
Jul 6, 7:45 PM EDT	Special Weather Statement	PHI	New Castle	45 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.