Alert archive / Delaware / Severe Thunderstorm Warnings in 2019

Severe Thunderstorm Warning 278, NWS Philadelphia/Mount Holly

July 23, 2019Kent County, Sussex County, Delaware

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Jul 23, 2019, 12:44 AM EDT for Kent County, Sussex County, Delaware. It was in force for 31 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 23, 2019, 12:44 AM EDT (04:44 UTC)
Expired: Jul 23, 2019, 1:15 AM EDT
In force: 31 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

Counties Kent County, DE, Sussex County, DE

The radar

The Dover AFB radar (KDOX), 23 km from the middle of the area, began a volume at 04:43 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 00:00Z, 4.7 hours before the alert went out and 87 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: 1618 J/kg
Mixed-layer CIN: -13 J/kg
Mixed-layer LCL: 1734 m above ground
0-6 km bulk shear: 25 kt
0-1 km storm-relative helicity: 128 m²/s²
0-3 km storm-relative helicity: 120 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 2.1

Open this sounding in Storm Lab

The text

As transmitted.

764 
WUUS51 KPHI 230444
SVRPHI
DEC001-005-230515-
/O.NEW.KPHI.SV.W.0278.190723T0444Z-190723T0515Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mount Holly NJ
1244 AM EDT Tue Jul 23 2019

The National Weather Service in Mount Holly NJ has issued a

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

* Until 115 AM EDT.

* At 1244 AM EDT, a severe thunderstorm was located near Lewes, or 14
  miles northeast of Georgetown, moving northeast at 50 mph.

  HAZARD...60 mph wind gusts.

  SOURCE...Radar indicated.

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

* Locations impacted include...
  Georgetown, Milford, Millsboro, Harrington, Lewes, Milton,
  Dagsboro, Ellendale, Henlopen Acres, Sycamore, Big Stone Beach,
  Long Neck, Frankford, Frederica, Houston, Dewey Beach and
  Farmington.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3853 7554 3899 7559 3901 7533 3890 7531
      3879 7518 3878 7512 3879 7509 3869 7507
      3869 7514 3864 7513 3861 7508 3862 7515
      3859 7520 3859 7521 3845 7505
TIME...MOT...LOC 0444Z 233DEG 44KT 3885 7521 

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

NC

1 follow-up statement

888 
WWUS51 KPHI 230512
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
112 AM EDT Tue Jul 23 2019

DEC001-005-230520-
/O.EXP.KPHI.SV.W.0278.000000T0000Z-190723T0515Z/
Sussex DE-Kent DE-
112 AM EDT Tue Jul 23 2019

...THE SEVERE THUNDERSTORM WARNING FOR SUSSEX AND SOUTHEASTERN KENT
COUNTIES WILL EXPIRE AT 115 AM EDT...
        
The stormd which prompted the warning have moved out of the area.
Therefore, the warning will be allowed to expire.  However gusty 
winds and heavy rain are still possible with additional 
thunderstorms tonight.

To report severe weather, contact your nearest law enforcement
agency. They will relay your report to the National Weather Service
Mount Holly NJ.

LAT...LON 3853 7554 3899 7559 3901 7533 3890 7531
      3879 7518 3878 7512 3879 7509 3869 7507
      3869 7514 3864 7513 3861 7508 3862 7515
      3859 7520 3859 7521 3845 7505
TIME...MOT...LOC 0510Z 233DEG 44KT 3903 7490 

$$

NC

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 22, 11:58 PM EDT	Severe Thunderstorm Warning	PHI	Kent, Sussex	47 min
Jul 23, 7:48 PM EDT	Areal Flood Advisory	PHI	New Castle	3 hr

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.