Alert archive / Delaware / Severe Thunderstorm Warnings in 2018

Severe Thunderstorm Warning 96, NWS Philadelphia/Mount Holly

September 7, 2018Kent County, Delaware

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Sep 7, 2018, 5:05 PM EDT for Kent County, Delaware. It was in force for 39 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 7, 2018, 5:05 PM EDT (21:05 UTC)
Expired: Sep 7, 2018, 5:44 PM EDT
In force: 39 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

County Kent County, DE

The nearest sounding before it

Wallops Is Stn, VA (KWAL), launched 12:00Z, 9.1 hours before the alert went out and 142 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: 1722 J/kg
Mixed-layer CIN: -28 J/kg
Mixed-layer LCL: 884 m above ground
0-6 km bulk shear: 8 kt
0-1 km storm-relative helicity: -8 m²/s²
0-3 km storm-relative helicity: -19 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

636 
WUUS51 KPHI 072105
SVRPHI
DEC001-072200-
/O.NEW.KPHI.SV.W.0096.180907T2105Z-180907T2200Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mount Holly NJ
505 PM EDT FRI SEP 7 2018

The National Weather Service in Mount Holly NJ has issued a

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

* Until 600 PM EDT.

* At 504 PM EDT, a severe thunderstorm was located over Dover, moving
  northeast at 5 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, Camden, Rising Sun-Lebanon, Woodland Beach, Rising Sun,
  Dover Base Housing, Dover Speedway, Wyoming, Little Creek, Leipsic,
  Rodney Village, Kent Acres and Highland Acres.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Prepare immediately for hail and damaging winds. People outside 
should move immediately to shelter inside a strong building. Stay 
away from windows.

In addition to 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 3913 7561 3938 7551 3933 7542 3927 7537
      3914 7537 3907 7549
TIME...MOT...LOC 2104Z 213DEG 6KT 3914 7551 

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

Gorse

2 follow-up statements

518 
WWUS51 KPHI 072124
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
524 PM EDT FRI SEP 7 2018

DEC001-072200-
/O.CON.KPHI.SV.W.0096.000000T0000Z-180907T2200Z/
Kent DE-
524 PM EDT FRI SEP 7 2018

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 600 PM EDT
FOR NORTHEASTERN KENT COUNTY...

At 523 PM EDT, a severe thunderstorm was located near Dover Speedway,
or near Dover, moving northeast at 15 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, Woodland Beach, Dover Speedway, Little Creek and Leipsic. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

In addition to 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 3938 7551 3934 7544 3927 7537 3914 7537
      3912 7548 3922 7557
TIME...MOT...LOC 2123Z 207DEG 12KT 3923 7545 

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

Gorse

582 
WWUS51 KPHI 072144
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
544 PM EDT FRI SEP 7 2018

DEC001-072154-
/O.CAN.KPHI.SV.W.0096.000000T0000Z-180907T2200Z/
Kent DE-
544 PM EDT FRI SEP 7 2018

...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN KENT 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 heavy rain is
still possible with this thunderstorm.

LAT...LON 3938 7551 3934 7544 3927 7537 3914 7537
      3912 7548 3922 7557
TIME...MOT...LOC 2142Z 213DEG 6KT 3926 7542 

$$

Gorse

The office that day

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

Issued	Product	Office	Counties	Lasted
Sep 7, 1:01 PM EDT	Special Weather Statement	PHI	Sussex	44 min
Sep 7, 1:45 PM EDT	Special Weather Statement	PHI	Sussex	30 min
Sep 7, 2:01 PM EDT	Areal Flood Advisory	PHI	Sussex	2 hr
Sep 7, 2:49 PM EDT	Special Weather Statement	PHI	Sussex	41 min
Sep 7, 4:12 PM EDT	Areal Flood Advisory	PHI	Kent, Sussex	94 min
Sep 7, 4:58 PM EDT	Special Weather Statement	PHI	Kent	47 min

Nearby

Severe Thunderstorm Warnings in Delaware, 2018 Every severe thunderstorm warning in 2018

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.