Alert archive / Delaware / Severe Thunderstorm Warnings in 2019

Severe Thunderstorm Warning 302, NWS Philadelphia/Mount Holly

August 1, 2019Kent County, Sussex County, Delaware

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Aug 1, 2019, 4:00 PM EDT for Kent County, Sussex County, Delaware. It was in force for 60 min. 4 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: Aug 1, 2019, 4:00 PM EDT (20:00 UTC)
Expired: Aug 1, 2019, 5:00 PM EDT
In force: 60 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Kent County, DE, Sussex County, DE

The radar

The Dover AFB radar (KDOX), 10 km from the middle of the area, began a volume at 19:59 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
Aug 1, 4:05 PM EDT	HAIL 1	Harrington, DE	QUARTER SIZE HAIL REPORTED IN HARRINGTON.
Aug 1, 4:06 PM EDT	HAIL 0.25	Harrington, DE	PEA SIZED HAIL REPORTED IN HARRINGTON. TIME ESTIMATED FROM RADAR.
Aug 1, 4:58 PM EDT	TSTM WND DMG	2 W Felton, DE	TREE LIMBS DOWN AT THE INTERSECTION OF SANDTOWN ROAD AND BURNITE MILL ROAD. TIME ESTIMATED FROM RADAR.
Aug 1, 5:02 PM EDT	TSTM WND DMG	Felton, DE	TREES AND WIRES REPORTED DOWN IN FELTON. TIME ESTIMATED FROM RADAR.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Wallops Is Stn, VA (KWAL), launched 12:00Z, 8.0 hours before the alert went out and 109 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: 134 J/kg
Mixed-layer CIN: -156 J/kg
Mixed-layer LCL: 1051 m above ground
0-6 km bulk shear: 24 kt
0-1 km storm-relative helicity: -1 m²/s²
0-3 km storm-relative helicity: 26 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

376 
WUUS51 KPHI 012000
SVRPHI
DEC001-005-012100-
/O.NEW.KPHI.SV.W.0302.190801T2000Z-190801T2100Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mount Holly NJ
400 PM EDT Thu Aug 1 2019

The National Weather Service in Mount Holly NJ has issued a

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

* Until 500 PM EDT.

* At 359 PM EDT, a severe thunderstorm was located over Harrington,
  or 15 miles south of Dover, moving southeast 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...
  Milford, Harrington, Viola, Andrewsville, Felton, Greenwood,
  Frederica, Houston, Farmington, Woodside East and Riverview.

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.

&&

LAT...LON 3874 7571 3897 7572 3908 7553 3895 7531
      3894 7531 3893 7532 3888 7528
TIME...MOT...LOC 1959Z 309DEG 9KT 3894 7555 

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

Gorse

1 follow-up statement

306 
WWUS51 KPHI 012019
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
419 PM EDT Thu Aug 1 2019

DEC001-005-012100-
/O.CON.KPHI.SV.W.0302.000000T0000Z-190801T2100Z/
Sussex DE-Kent DE-
419 PM EDT Thu Aug 1 2019

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 500 PM EDT
FOR NORTHWESTERN SUSSEX AND SOUTHERN KENT COUNTIES...

At 419 PM EDT, a severe thunderstorm was located over Harrington, or
16 miles northwest of Georgetown, moving south 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...
Milford, Harrington, Andrewsville, Greenwood, Frederica, Houston and
Farmington.

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.
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.

&&

LAT...LON 3874 7571 3897 7572 3902 7547 3888 7528
TIME...MOT...LOC 2019Z 340DEG 8KT 3888 7556 

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

Gorse

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 31, 8:39 PM EDT	Special Weather Statement	PHI	Sussex	36 min
Jul 31, 8:48 PM EDT	Special Weather Statement	PHI	Sussex	27 min
Jul 31, 9:18 PM EDT	Special Weather Statement	PHI	Sussex	27 min
Aug 1, 2:43 PM EDT	Special Weather Statement	PHI	Kent	47 min
Aug 1, 3:02 PM EDT	Coastal Flood Advisory	PHI	Kent, New Castle, Sussex	12 hr
Aug 1, 3:39 PM EDT	Special Weather Statement	PHI	Kent	51 min
Aug 1, 3:51 PM EDT	Special Weather Statement	PHI	Kent	39 min
Aug 1, 4:06 PM EDT	Severe Thunderstorm Warning	PHI	Kent, New Castle	54 min
Aug 1, 4:11 PM EDT	Special Weather Statement	PHI	New Castle	34 min
Aug 1, 4:41 PM EDT	Severe Thunderstorm Warning	PHI	New Castle	21 min
Aug 1, 4:56 PM EDT	Severe Thunderstorm Warning	PHI	Kent, Sussex	50 min
Aug 1, 5:28 PM EDT	Severe Thunderstorm Warning	PHI	Sussex	47 min
Aug 1, 6:16 PM EDT	Special Weather Statement	PHI	Sussex	14 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.