Alert archive / Delaware / Severe Thunderstorm Warnings in 2020

Severe Thunderstorm Warning 282, NWS Philadelphia/Mount Holly

August 28, 2020Kent County, Sussex County, Delaware; Caroline County, Maryland

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Aug 28, 2020, 6:17 PM EDT for Kent County, Sussex County, Delaware; Caroline County, Maryland. It was in force for 43 min. 1 report 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 28, 2020, 6:17 PM EDT (22:17 UTC)
Expired: Aug 28, 2020, 7:00 PM EDT
In force: 43 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon
Hail: 1.25 in
Wind: 60.0 mph

Counties Kent County, DE, Sussex County, DE, Caroline County, MD

The radar

The Dover AFB radar (KDOX), 30 km from the middle of the area, began a volume at 22:16 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 28, 6:52 PM EDT	TSTM WND DMG	3 Ese Farmington, DE	DOWNED TREE LIMBS AND WIRES NEAR STAYTONVILLE ROAD EAST OF FARMINGTON. TIME ESTIMATED FROM RADAR.

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

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Aug 28, 1:37 PM EDT	Severe Thunderstorm Watch	SPC	8 hr

The nearest sounding before it

Wallops Is Stn, VA (KWAL), launched 12:00Z, 10.3 hours before the alert went out and 107 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: 264 J/kg
Mixed-layer CIN: -171 J/kg
Mixed-layer LCL: 1367 m above ground
0-6 km bulk shear: 24 kt
0-1 km storm-relative helicity: 44 m²/s²
0-3 km storm-relative helicity: 104 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

311 
WUUS51 KPHI 282217
SVRPHI
DEC001-005-MDC011-282300-
/O.NEW.KPHI.SV.W.0282.200828T2217Z-200828T2300Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mount Holly NJ
617 PM EDT Fri Aug 28 2020

The National Weather Service in Mount Holly NJ has issued a

* Severe Thunderstorm Warning for...
  Northwestern Sussex County in southern Delaware...
  Southwestern Kent County in central Delaware...
  East central Caroline County in eastern Maryland...

* Until 700 PM EDT.

* At 617 PM EDT, a severe thunderstorm was located over Denton, or 16
  miles northeast of Easton, moving southeast at 30 mph.

  HAZARD...60 mph wind gusts and half dollar 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...
  Seaford, Denton, Harrington, Bridgeville, Greensboro, Ridgely,
  Ellendale, Smithville, Griffin, Andrewsville, Greenwood and
  Farmington.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Protecting yourself from immediate threats to life and safety shall
take priority.  Whenever possible, as long as it does not cause
greater harm, all COVID-19 protective action guidance should be
followed.

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 3884 7592 3885 7593 3886 7592 3886 7593
      3900 7585 3885 7532 3861 7552
TIME...MOT...LOC 2217Z 295DEG 27KT 3889 7581 

HAIL...1.25IN
WIND...60MPH
 
$$

Staarmann

2 follow-up statements

451 
WWUS51 KPHI 282241
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
641 PM EDT Fri Aug 28 2020

MDC011-282251-
/O.CAN.KPHI.SV.W.0282.000000T0000Z-200828T2300Z/
Caroline MD-
641 PM EDT Fri Aug 28 2020

...THE SEVERE THUNDERSTORM WARNING FOR EAST CENTRAL CAROLINE COUNTY
IS CANCELLED...
    
The severe thunderstorm which prompted the warning has moved out of 
the warned area. Therefore, the warning has been cancelled.

A Severe Thunderstorm Watch remains in effect until 800 PM EDT for
central and southern Delaware.

LAT...LON 3880 7572 3889 7571 3893 7565 3892 7557
      3885 7532 3864 7550
TIME...MOT...LOC 2241Z 294DEG 23KT 3884 7566 

$$

DEC001-005-282300-
/O.CON.KPHI.SV.W.0282.000000T0000Z-200828T2300Z/
Sussex DE-Kent DE-
641 PM EDT Fri Aug 28 2020

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 700 PM EDT
FOR NORTHWESTERN SUSSEX AND SOUTHWESTERN KENT COUNTIES...

At 641 PM EDT, a severe thunderstorm was located over Andrewsville,
or 18 miles northwest of Georgetown, moving southeast at 25 mph.

HAZARD...60 mph wind gusts and half dollar 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...
Harrington, Bridgeville, Ellendale, Andrewsville, Greenwood and
Farmington.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Protecting yourself from immediate threats to life and safety shall
take priority.  Whenever possible, as long as it does not cause
greater harm, all COVID-19 protective action guidance should be
followed.

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 3880 7572 3889 7571 3893 7565 3892 7557
      3885 7532 3864 7550
TIME...MOT...LOC 2241Z 294DEG 23KT 3884 7566 

HAIL...1.25IN
WIND...60MPH
 
$$

Staarmann

283 
WWUS51 KPHI 282259
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
659 PM EDT Fri Aug 28 2020

DEC001-005-282309-
/O.EXP.KPHI.SV.W.0282.000000T0000Z-200828T2300Z/
Sussex DE-Kent DE-
659 PM EDT Fri Aug 28 2020

...THE SEVERE THUNDERSTORM WARNING FOR NORTHWESTERN SUSSEX AND
SOUTHWESTERN KENT COUNTIES WILL EXPIRE AT 700 PM EDT...
                
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 will be allowed to expire.  However small hail
and gusty winds are still possible with this thunderstorm.

A Severe Thunderstorm Watch remains in effect until 800 PM EDT for
central and southern Delaware.

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 3880 7572 3889 7571 3893 7565 3892 7557
      3885 7532 3864 7550
TIME...MOT...LOC 2259Z 295DEG 27KT 3878 7551 

$$

Staarmann

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 28, 1:53 PM EDT	Severe Thunderstorm Warning	PHI	New Castle	52 min
Aug 28, 2:40 PM EDT	Severe Thunderstorm Warning	PHI	Kent, New Castle	50 min
Aug 28, 3:15 PM EDT	Special Weather Statement	PHI	New Castle	30 min
Aug 28, 3:21 PM EDT	Severe Thunderstorm Warning	PHI	Kent, New Castle	24 min
Aug 28, 3:41 PM EDT	Special Weather Statement	PHI	New Castle	34 min
Aug 28, 3:52 PM EDT	Severe Thunderstorm Warning	PHI	New Castle	53 min
Aug 28, 4:01 PM EDT	Severe Thunderstorm Warning	PHI	New Castle	44 min
Aug 28, 4:39 PM EDT	Severe Thunderstorm Warning	PHI	Kent, New Castle	66 min
Aug 28, 5:40 PM EDT	Special Weather Statement	PHI	Kent	35 min
Aug 28, 7:53 PM EDT	Special Weather Statement	PHI	Sussex	37 min

Nearby

Severe Thunderstorm Warnings in Delaware, 2020 Severe Thunderstorm Warnings in Maryland, 2020 Every severe thunderstorm warning in 2020

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.