Alert archive / Delaware / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 115, NWS Philadelphia/Mount Holly

July 1, 2021Kent County, Sussex County, Delaware

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Jul 1, 2021, 5:12 PM EDT for Kent County, Sussex County, Delaware. It was in force for 48 min. 5 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: Jul 1, 2021, 5:12 PM EDT (21:12 UTC)
Expired: Jul 1, 2021, 6:00 PM EDT
In force: 48 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon
Tornado: Possible
Hail: 0.75 in
Wind: 70.0 mph

Counties Kent County, DE, Sussex County, DE

The radar

The Dover AFB radar (KDOX), 25 km from the middle of the area, began a volume at 21:12 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
Jul 1, 5:16 PM EDT	TSTM WND GST 56	Lewes, DE	WEATHERFLOW.
Jul 1, 5:18 PM EDT	TSTM WND GST 64	1 Ene Lewes, DE	NOS GAUGE LWSD1.
Jul 1, 5:19 PM EDT	TSTM WND DMG	Stockley, DE	DOWNED POWER POLES AND WIRES NEAR MORRIS MILL ROAD. TIME ESTIMATED FROM RADAR.
Jul 1, 5:24 PM EDT	TSTM WND GST 61	1 Ene Lewes, DE	NOS GAUGE LWSD1.
Jul 1, 5:30 PM EDT	MARINE TSTM WIND 50	1 Ne Lewes, DE	CAPE HENLOPEN WEATHERFLOW SITE.

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
Jul 1, 12:46 PM EDT	Severe Thunderstorm Watch	SPC	7 hr

The nearest sounding before it

Wallops Is Stn, VA (KWAL), launched 12:00Z, 9.2 hours before the alert went out and 83 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: 1445 J/kg
Mixed-layer CIN: -95 J/kg
Mixed-layer LCL: 981 m above ground
0-6 km bulk shear: 20 kt
0-1 km storm-relative helicity: 29 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.

299 
WUUS51 KPHI 012112
SVRPHI
DEC001-005-012200-
/O.NEW.KPHI.SV.W.0115.210701T2112Z-210701T2200Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mount Holly NJ
512 PM EDT Thu Jul 1 2021

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 600 PM EDT.

* At 511 PM EDT, severe thunderstorms were located along a line
  extending from 8 miles northeast of Bowers to Gumboro, moving east
  at 35 mph.

  HAZARD...70 mph wind gusts.

  SOURCE...Law enforcement. Several reports of wind damage have been 
           received from Kent and Sussex Counties.

  IMPACT...Expect considerable tree damage. Damage is likely to 
           mobile homes, roofs, and outbuildings.

* Locations impacted include...
  Georgetown, Milford, Millsboro, Lewes, Milton, Selbyville,
  Dagsboro, Millville, Ellendale, Bowers, Henlopen Acres, Gumboro,
  Cape Henlopen State Park, Sycamore, Big Stone Beach, Long Neck,
  Ocean View, Frankford, South Bethany and Dewey Beach.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Remain alert for a possible tornado! Tornadoes can develop quickly
from severe thunderstorms. If you spot a tornado go at once into the
basement or small central room in a sturdy structure.

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

&&

LAT...LON 3846 7553 3914 7542 3893 7524 3883 7518
      3881 7506 3845 7501 3846 7505 3845 7505
TIME...MOT...LOC 2111Z 284DEG 32KT 3912 7526 3846 7536 

TORNADO...POSSIBLE
HAIL...<.75IN
WIND...70MPH
 
$$

CMS

2 follow-up statements

841 
WWUS51 KPHI 012143
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
543 PM EDT Thu Jul 1 2021

DEC001-012152-
/O.CAN.KPHI.SV.W.0115.000000T0000Z-210701T2200Z/
Kent DE-
543 PM EDT Thu Jul 1 2021

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN KENT COUNTY IS
CANCELLED...

The storms which prompted the warning have moved out of the warned 
area. Therefore, the warning has been cancelled.

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

LAT...LON 3846 7525 3883 7518 3881 7506 3845 7501
      3846 7504 3845 7505
TIME...MOT...LOC 2142Z 284DEG 32KT 3906 7493 3840 7503 

$$

DEC005-012200-
/O.CON.KPHI.SV.W.0115.000000T0000Z-210701T2200Z/
Sussex DE-
543 PM EDT Thu Jul 1 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 600 PM EDT
FOR SOUTHEASTERN SUSSEX COUNTY...

At 542 PM EDT, severe thunderstorms were located along a line
extending from Green Creek to near Ocean City, moving east at 35 mph.

HAZARD...70 mph wind gusts.

SOURCE...Law enforcement. A 60 mph wind gust occurred in Lewes with 
         these storms.

IMPACT...Expect considerable tree damage. Damage is likely to mobile 
         homes, roofs, and outbuildings.

Locations impacted include...
Lewes, Selbyville, Dagsboro, Millville, Henlopen Acres, Cape Henlopen
State Park, Long Neck, Ocean View, Frankford, South Bethany and Dewey
Beach.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Remain alert for a possible tornado! Tornadoes can develop quickly
from severe thunderstorms. If you spot a tornado go at once into the
basement or small central room in a sturdy structure.

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

&&

LAT...LON 3846 7525 3883 7518 3881 7506 3845 7501
      3846 7504 3845 7505
TIME...MOT...LOC 2142Z 284DEG 32KT 3906 7493 3840 7503 

TORNADO...POSSIBLE
HAIL...<.75IN
WIND...70MPH
 
$$

CMS

489 
WWUS51 KPHI 012152
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
552 PM EDT Thu Jul 1 2021

DEC005-012201-
/O.EXP.KPHI.SV.W.0115.000000T0000Z-210701T2200Z/
Sussex DE-
552 PM EDT Thu Jul 1 2021

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN SUSSEX COUNTY
WILL EXPIRE AT 600 PM EDT...
    
The storms which prompted the warning have moved out of the area.
Therefore, the warning will be allowed to expire.  However, gusty 
winds are still possible with these thunderstorms.

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

LAT...LON 3846 7525 3883 7518 3881 7506 3845 7501
      3846 7504 3845 7505
TIME...MOT...LOC 2151Z 284DEG 32KT 3904 7483 3838 7493 

$$

CMS

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 30, 9:21 PM EDT	Special Weather Statement	PHI	New Castle	39 min
Jul 1, 3:48 PM EDT	Areal Flood Advisory	PHI	New Castle	112 min
Jul 1, 3:50 PM EDT	Severe Thunderstorm Warning	PHI	New Castle	40 min
Jul 1, 4:08 PM EDT	Severe Thunderstorm Warning	PHI	Sussex	52 min
Jul 1, 4:08 PM EDT	Severe Thunderstorm Warning	PHI	Kent	52 min
Jul 1, 4:10 PM EDT	Areal Flood Advisory	PHI	Kent, New Castle	94 min
Jul 1, 4:27 PM EDT	Severe Thunderstorm Warning	PHI	New Castle	48 min
Jul 1, 4:32 PM EDT	Severe Thunderstorm Warning	PHI	Kent, New Castle, Sussex	43 min
Jul 1, 4:57 PM EDT	Tornado Warning	PHI	Kent, Sussex	22 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.