Alert archive / Delaware / Tornado Warnings in 2021

Tornado Warning 1, NWS Philadelphia/Mount Holly

July 1, 2021Kent County, Sussex County, Delaware

NWS Philadelphia/Mount Holly issued this tornado warning at Jul 1, 2021, 4:57 PM EDT for Kent County, Sussex County, Delaware. It was in force for 22 min. 6 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, 4:57 PM EDT (20:57 UTC)
Expired: Jul 1, 2021, 5:19 PM EDT
In force: 22 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon
Tornado: Radar indicated
Hail: 0.75 in

Counties Kent County, DE, Sussex County, DE

The radar

The Dover AFB radar (KDOX), 9 km from the middle of the area, began a volume at 20:56 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, 4:58 PM EDT	TSTM WND DMG	2 Sw Houston, DE	DOWNED TREES AND WIRES NEAR THISTLEWOOD ROAD. TIME ESTIMATED FROM RADAR.
Jul 1, 5:00 PM EDT	TSTM WND DMG	2 Wsw Houston, DE	ROOF DAMAGE TO A MOBILE HOME ON HUNTING QUARTER ROAD NEAR WILLIAMSVILLE, DE. TIME ESTIMATED FROM RADAR. SOCIAL MEDIA REPORT.
Jul 1, 5:00 PM EDT	TORNADO	2 Ene Milford, DE	UPDATES PREVIOUS TORNADO REPORT FROM 3 ENE MILFORD TO REFLECT STORM SURVEY RESULTS. DAMAGE WAS FIRST OBSERVED NEAR RESIDENCES AT THE CEDAR BEACH ROAD AND MCCOLLEY ROAD INTERSECTION. HERE, SEVERAL LARGE BRANCHES AND TREES WERE SNAPPED. FURTHER EAST ALONG CEDAR
Jul 1, 5:02 PM EDT	TORNADO	3 Ene Milford, DE	SIGNIFICANT TREE DAMAGE WITH SOME TREES INTO HOUSES.
Jul 1, 5:03 PM EDT	TSTM WND DMG	2 E Milford, DE	SEVERAL LARGE TREES DOWNED. TIME ESTIMATED FROM RADAR.
Jul 1, 5:05 PM EDT	TSTM WND GST 46	1 E Milford, DE

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, 9.0 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: 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.

991 
WFUS51 KPHI 012057
TORPHI
DEC001-005-012130-
/O.NEW.KPHI.TO.W.0001.210701T2057Z-210701T2130Z/

BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service Mount Holly NJ
457 PM EDT Thu Jul 1 2021

The National Weather Service in Mount Holly NJ has issued a

* Tornado Warning for...
  North central Sussex County in southern Delaware...
  Southeastern Kent County in central Delaware...

* Until 530 PM EDT.
    
* At 457 PM EDT, a severe thunderstorm capable of producing a tornado
  was located near Milford, or 15 miles north of Georgetown, moving
  east at 50 mph.

  HAZARD...Tornado.

  SOURCE...Radar indicated rotation.

  IMPACT...Flying debris will be dangerous to those caught without 
           shelter. Mobile homes will be damaged or destroyed. 
           Damage to roofs, windows, and vehicles will occur.  Tree 
           damage is likely.

* Locations impacted include...
  Milford, Harrington, Big Stone Beach and Houston. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TAKE COVER NOW! Move to a basement or an interior room on the lowest
floor of a sturdy building. Avoid windows. If you are outdoors, in a
mobile home, or in a vehicle, move to the closest substantial shelter
and protect yourself from flying debris.

&&

LAT...LON 3885 7556 3892 7558 3904 7521 3888 7517
TIME...MOT...LOC 2057Z 257DEG 45KT 3890 7549 

TORNADO...RADAR INDICATED
HAIL...<.75IN

$$

Robertson

2 follow-up statements

093 
WWUS51 KPHI 012107
SVSPHI

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

DEC001-005-012130-
/O.CON.KPHI.TO.W.0001.000000T0000Z-210701T2130Z/
Sussex DE-Kent DE-
507 PM EDT Thu Jul 1 2021

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 530 PM EDT FOR NORTH
CENTRAL SUSSEX AND SOUTHEASTERN KENT COUNTIES...
    
At 506 PM EDT, a severe thunderstorm capable of producing a tornado
was located near Big Stone Beach, or 15 miles north of Georgetown,
moving east at 45 mph.

HAZARD...Tornado.

SOURCE...Radar indicated rotation.

IMPACT...Flying debris will be dangerous to those caught without 
         shelter. Mobile homes will be damaged or destroyed. Damage 
         to roofs, windows, and vehicles will occur.  Tree damage is 
         likely.

Locations impacted include...
Milford.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TAKE COVER NOW! Move to a basement or an interior room on the lowest
floor of a sturdy building. Avoid windows. If you are outdoors, in a
mobile home, or in a vehicle, move to the closest substantial shelter
and protect yourself from flying debris.

&&

LAT...LON 3890 7544 3898 7541 3898 7540 3897 7519
      3888 7517 3887 7530 3887 7536
TIME...MOT...LOC 2106Z 285DEG 38KT 3891 7530 

TORNADO...RADAR INDICATED
HAIL...<.75IN

$$

Robertson

376 
WWUS51 KPHI 012119
SVSPHI

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

DEC001-005-012128-
/O.CAN.KPHI.TO.W.0001.000000T0000Z-210701T2130Z/
Sussex DE-Kent DE-
519 PM EDT Thu Jul 1 2021

...THE TORNADO WARNING FOR NORTH CENTRAL SUSSEX AND SOUTHEASTERN KENT
COUNTIES IS CANCELLED...
    
The tornado threat has diminished and the Tornado Warning has been 
cancelled. However, damaging winds remain likely and a Severe 
Thunderstorm Warning remains in effect for the area.  

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

LAT...LON 3890 7544 3898 7541 3898 7540 3897 7519
      3888 7517 3887 7530 3887 7536
TIME...MOT...LOC 2117Z 257DEG 45KT 3894 7510 

$$

Robertson

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, 5:12 PM EDT	Severe Thunderstorm Warning	PHI	Kent, Sussex	48 min

Nearby

Tornado Warnings in Delaware, 2021 Every tornado warning in 2021 Tornadoes 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.