Alert archive / Delaware / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 282, NWS Philadelphia/Mount Holly

August 27, 2021Kent County, Delaware

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Aug 27, 2021, 9:04 PM EDT for Kent County, Delaware. It was in force for 41 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 27, 2021, 9:04 PM EDT (01:04 UTC)
Expired: Aug 27, 2021, 9:45 PM EDT
In force: 41 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

County Kent County, DE

The radar

The Dover AFB radar (KDOX), 30 km from the middle of the area, began a volume at 01:02 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 27, 9:04 PM EDT	TSTM WND DMG	5 Sse Sandtown, DE	DOWNED TREE ON WIRES NEAR HAYFIELD ROAD. 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 00:00Z, 1.1 hours before the alert went out and 128 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: 2567 J/kg
Mixed-layer CIN: -13 J/kg
Mixed-layer LCL: 1026 m above ground
0-6 km bulk shear: 20 kt
0-1 km storm-relative helicity: 60 m²/s²
0-3 km storm-relative helicity: 70 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

039 
WUUS51 KPHI 280104
SVRPHI
DEC001-280145-
/O.NEW.KPHI.SV.W.0282.210828T0104Z-210828T0145Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mount Holly NJ
904 PM EDT Fri Aug 27 2021

The National Weather Service in Mount Holly NJ has issued a

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

* Until 945 PM EDT.

* At 904 PM EDT, a severe thunderstorm was located over Sandtown, or
  13 miles southwest of Dover, moving east 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...
  Dover, Harrington, Camden, Bowers, Woodside, Viola, Rising
  Sun-Lebanon, Rising Sun, Hazlettville, Dover Base Housing, Big
  Stone Beach, Dover Speedway, Sandtown, Wyoming, Felton, Frederica,
  Magnolia, Little Creek, Marydel and Rodney Village.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

In addition to 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 7575 3923 7540 3896 7531 3891 7573
TIME...MOT...LOC 0104Z 249DEG 15KT 3901 7568 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

Gorse

2 follow-up statements

341 
WWUS51 KPHI 280120
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
920 PM EDT Fri Aug 27 2021

DEC001-280145-
/O.CON.KPHI.SV.W.0282.000000T0000Z-210828T0145Z/
Kent DE-
920 PM EDT Fri Aug 27 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 945 PM EDT
FOR CENTRAL KENT COUNTY...

At 920 PM EDT, a severe thunderstorm was located over Viola, or 9
miles south of Dover, moving east at 20 mph.

HAZARD...60 mph wind gusts.

SOURCE...Radar indicated.

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

Locations impacted include...
Dover, Harrington, Camden, Bowers, Woodside, Viola, Rising
Sun-Lebanon, Rising Sun, Hazlettville, Dover Base Housing, Big Stone
Beach, Dover Speedway, Wyoming, Felton, Frederica, Magnolia, Little
Creek, Rodney Village, Kent Acres and Riverview.

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 3915 7568 3923 7540 3896 7531 3892 7565
TIME...MOT...LOC 0120Z 254DEG 16KT 3903 7558 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

Gorse

637 
WWUS51 KPHI 280138
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
938 PM EDT Fri Aug 27 2021

DEC001-280148-
/O.EXP.KPHI.SV.W.0282.000000T0000Z-210828T0145Z/
Kent DE-
938 PM EDT Fri Aug 27 2021

...THE SEVERE THUNDERSTORM WARNING FOR CENTRAL KENT COUNTY WILL
EXPIRE AT 945 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 gusty 
winds are still possible with this thunderstorm. Frequent cloud to 
ground lightning is still occurring with this storm.

LAT...LON 3915 7568 3923 7540 3896 7531 3892 7565
TIME...MOT...LOC 0138Z 249DEG 15KT 3905 7550 

$$

Gorse

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 27, 8:29 PM EDT	Special Weather Statement	PHI	Kent	31 min
Aug 27, 8:57 PM EDT	Special Weather Statement	PHI	Kent	33 min
Aug 27, 9:09 PM EDT	Special Weather Statement	PHI	New Castle	36 min
Aug 27, 9:44 PM EDT	Special Weather Statement	PHI	Kent	31 min
Aug 28, 12:08 AM EDT	Special Weather Statement	PHI	Sussex	37 min

Nearby

Severe Thunderstorm Warnings in Delaware, 2021 Every severe thunderstorm warning in 2021

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.