Alert archive / Delaware / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 69, NWS Philadelphia/Mount Holly

June 9, 2021Kent County, Delaware

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Jun 9, 2021, 2:26 PM EDT for Kent County, Delaware. It was in force for 64 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: Jun 9, 2021, 2:26 PM EDT (18:26 UTC)
Expired: Jun 9, 2021, 3:30 PM EDT
In force: 64 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), 29 km from the middle of the area, began a volume at 18:28 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
Jun 9, 2:43 PM EDT	TSTM WND GST 59	Dover Air Force Base, DE	KDOV.

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, 6.4 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: 795 J/kg
Mixed-layer CIN: -87 J/kg
Mixed-layer LCL: 967 m above ground
0-6 km bulk shear: 9 kt
0-1 km storm-relative helicity: 19 m²/s²
0-3 km storm-relative helicity: 31 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

055 
WUUS51 KPHI 091826
SVRPHI
DEC001-091930-
/O.NEW.KPHI.SV.W.0069.210609T1826Z-210609T1930Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mount Holly NJ
226 PM EDT Wed Jun 9 2021

The National Weather Service in Mount Holly NJ has issued a

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

* Until 330 PM EDT.

* At 226 PM EDT, a severe thunderstorm was located over Rising
  Sun-Lebanon, or near Dover, moving north 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, Bowers, Woodside, Rising Sun-Lebanon, Rising Sun,
  Dover Base Housing, Dover Speedway, Wyoming, Frederica, Magnolia,
  Little Creek, Rodney Village, Kent Acres, Riverview, Highland Acres
  and Woodside East.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

In addition 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 3903 7538 3899 7553 3917 7560 3920 7539
TIME...MOT...LOC 1826Z 194DEG 5KT 3907 7548 

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

Gorse

3 follow-up statements

095 
WWUS51 KPHI 091844
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
244 PM EDT Wed Jun 9 2021

DEC001-091930-
/O.CON.KPHI.SV.W.0069.000000T0000Z-210609T1930Z/
Kent DE-
244 PM EDT Wed Jun 9 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 330 PM EDT
FOR CENTRAL KENT COUNTY...

At 244 PM EDT, a severe thunderstorm was located over Dover Base
Housing, or near Dover, and is nearly stationary.

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, Bowers, Rising Sun-Lebanon, Rising Sun, Dover Base
Housing, Dover Speedway, Wyoming, Magnolia, Little Creek, Rodney
Village, Kent Acres, Highland Acres, Woodside East 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 3903 7538 3901 7550 3917 7560 3920 7539
TIME...MOT...LOC 1844Z 201DEG 4KT 3911 7546 

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

Gorse

454 
WWUS51 KPHI 091856
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
256 PM EDT Wed Jun 9 2021

DEC001-091930-
/O.CON.KPHI.SV.W.0069.000000T0000Z-210609T1930Z/
Kent DE-
256 PM EDT Wed Jun 9 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 330 PM EDT
FOR CENTRAL KENT COUNTY...

At 255 PM EDT, a severe thunderstorm was located over Dover Base
Housing, or near Dover, and is nearly stationary.

HAZARD...60 mph wind gusts and penny size hail. 

SOURCE...Radar indicated. A 59 mph wind gust was measured at the 
         Dover Air Force Base.

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

Locations impacted include...
Dover, Camden, Bowers, Rising Sun-Lebanon, Rising Sun, Dover Base
Housing, Dover Speedway, Wyoming, Magnolia, Little Creek, Rodney
Village, Kent Acres, Highland Acres and Woodside East.

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 3906 7539 3904 7551 3917 7560 3920 7539
TIME...MOT...LOC 1855Z 164DEG 3KT 3914 7546 

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

Gorse

338 
WWUS51 KPHI 091922
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
322 PM EDT Wed Jun 9 2021

DEC001-091932-
/O.EXP.KPHI.SV.W.0069.000000T0000Z-210609T1930Z/
Kent DE-
322 PM EDT Wed Jun 9 2021

...THE SEVERE THUNDERSTORM WARNING FOR CENTRAL KENT COUNTY WILL
EXPIRE AT 330 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 and heavy rain are still possible with this thunderstorm.

LAT...LON 3906 7539 3904 7551 3917 7560 3920 7539
TIME...MOT...LOC 1922Z 194DEG 5KT 3917 7545 

$$

Gorse

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 8, 8:15 PM EDT	Special Weather Statement	PHI	Sussex	45 min
Jun 9, 7:54 AM EDT	River Flood Warning	PHI	New Castle	5 hr
Jun 9, 1:35 PM EDT	Special Weather Statement	PHI	New Castle	25 min
Jun 9, 2:07 PM EDT	Severe Thunderstorm Warning	PHI	New Castle	23 min
Jun 9, 2:21 PM EDT	Flash Flood Warning	PHI	New Castle	73 min
Jun 9, 2:28 PM EDT	Severe Thunderstorm Warning	PHI	Sussex	62 min
Jun 9, 3:11 PM EDT	Severe Thunderstorm Warning	PHI	Sussex	64 min
Jun 9, 3:24 PM EDT	Areal Flood Advisory	PHI	Sussex	3 hr
Jun 9, 4:32 PM EDT	Areal Flood Advisory	PHI	Sussex	108 min
Jun 9, 4:37 PM EDT	Severe Thunderstorm Warning	PHI	Kent, Sussex	27 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.