Alert archive / Delaware / Tornado Warnings in 2021

Tornado Warning 7, NWS Philadelphia/Mount Holly

July 9, 2021Sussex County, Delaware

NWS Philadelphia/Mount Holly issued this tornado warning at Jul 9, 2021, 12:11 AM EDT for Sussex County, Delaware. It was in force for 35 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Jul 9, 2021, 12:11 AM EDT (04:11 UTC)
Expired: Jul 9, 2021, 12:46 AM EDT
In force: 35 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon
Tornado: Radar indicated
Hail: 0.0 in

County Sussex County, DE

The radar

The Dover AFB radar (KDOX), 33 km from the middle of the area, began a volume at 04:14 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.

The nearest sounding before it

Wallops Is Stn, VA (KWAL), launched 00:00Z, 4.2 hours before the alert went out and 68 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: 440 J/kg
Mixed-layer CIN: -10 J/kg
Mixed-layer LCL: 675 m above ground
0-6 km bulk shear: 42 kt
0-1 km storm-relative helicity: 151 m²/s²
0-3 km storm-relative helicity: 336 m²/s²
Significant tornado parameter: 0.3
Supercell composite: 3.3

Open this sounding in Storm Lab

The text

As transmitted.

541 
WFUS51 KPHI 090411
TORPHI
DEC005-090500-
/O.NEW.KPHI.TO.W.0007.210709T0411Z-210709T0500Z/

BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service Mount Holly NJ
1211 AM EDT Fri Jul 9 2021

The National Weather Service in Mount Holly NJ has issued a

* Tornado Warning for...
  Southwestern Sussex County in southern Delaware...

* Until 100 AM EDT.
    
* At 1211 AM EDT, a severe thunderstorm capable of producing a
  tornado was located near Gumboro, or 11 miles east of Salisbury,
  moving north at 25 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...
  Laurel, Sycamore and Gumboro. 

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.

Tornadoes are extremely difficult to see and confirm at night. Do not
wait to see or hear the tornado. TAKE COVER NOW!

&&

LAT...LON 3846 7553 3854 7562 3865 7554 3865 7536
      3845 7532
TIME...MOT...LOC 0411Z 158DEG 23KT 3841 7538 

TORNADO...RADAR INDICATED
HAIL...0.00IN

$$

BAH

5 follow-up statements

793 
WWUS51 KPHI 090428
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
1228 AM EDT Fri Jul 9 2021

DEC005-090500-
/O.CON.KPHI.TO.W.0007.000000T0000Z-210709T0500Z/
Sussex DE-
1228 AM EDT Fri Jul 9 2021

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 100 AM EDT FOR
SOUTHWESTERN SUSSEX COUNTY...
    
At 1228 AM EDT, a severe thunderstorm capable of producing a tornado
was located near Sycamore, or 10 miles south of Georgetown, moving
north at 25 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...
Laurel and Sycamore. 

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.

Tornadoes are extremely difficult to see and confirm at night. Do not
wait to see or hear the tornado. TAKE COVER NOW!

&&

LAT...LON 3846 7548 3856 7560 3865 7554 3865 7539
      3850 7533 3846 7543
TIME...MOT...LOC 0428Z 162DEG 23KT 3854 7545 

TORNADO...RADAR INDICATED
HAIL...0.00IN

$$

Deal

365 
WWUS51 KPHI 090434
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
1234 AM EDT Fri Jul 9 2021

DEC005-090500-
/O.CON.KPHI.TO.W.0007.000000T0000Z-210709T0500Z/
Sussex DE-
1234 AM EDT Fri Jul 9 2021

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 100 AM EDT FOR
SOUTHWESTERN SUSSEX COUNTY...
    
At 1234 AM EDT, a severe thunderstorm capable of producing a tornado
was located over Sycamore, or 9 miles southwest of Georgetown, moving
northwest at 20 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...
Sycamore.

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.

Tornadoes are extremely difficult to see and confirm at night. Do not
wait to see or hear the tornado. TAKE COVER NOW!

&&

LAT...LON 3851 7548 3859 7558 3865 7554 3865 7543
      3854 7540
TIME...MOT...LOC 0434Z 140DEG 18KT 3857 7548 

TORNADO...RADAR INDICATED
HAIL...0.00IN

$$

Deal

152 
WWUS51 KPHI 090441
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
1241 AM EDT Fri Jul 9 2021

DEC005-090500-
/O.CON.KPHI.TO.W.0007.000000T0000Z-210709T0500Z/
Sussex DE-
1241 AM EDT Fri Jul 9 2021

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 100 AM EDT FOR CENTRAL
SUSSEX COUNTY...
    
At 1241 AM EDT, a severe thunderstorm capable of producing a tornado
was located over Sycamore, or 8 miles southwest of Georgetown, moving
northwest at 30 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...
Sycamore.

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.

Tornadoes are extremely difficult to see and confirm at night. Do not
wait to see or hear the tornado. TAKE COVER NOW!

&&

LAT...LON 3858 7552 3862 7556 3865 7554 3865 7548
      3860 7547
TIME...MOT...LOC 0441Z 155DEG 25KT 3862 7552 

TORNADO...RADAR INDICATED
HAIL...0.00IN

$$

Deal

260 
WWUS51 KPHI 090443
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
1243 AM EDT Fri Jul 9 2021

DEC005-090500-
/O.CON.KPHI.TO.W.0007.000000T0000Z-210709T0500Z/
Sussex DE-
1243 AM EDT Fri Jul 9 2021

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 100 AM EDT FOR CENTRAL
SUSSEX COUNTY...
        
At 1243 AM EDT, a confirmed tornado was located near Sycamore, or 8
miles southwest of Georgetown, moving north at 25 mph.

HAZARD...Damaging tornado.

SOURCE...Radar confirmed tornado.

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...
Sycamore.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

To repeat, a tornado has been confirmed. 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.

Tornadoes are extremely difficult to see and confirm at night. Do not
wait to see or hear the tornado. TAKE COVER NOW!

&&

LAT...LON 3858 7552 3862 7556 3865 7554 3865 7548
      3860 7547
TIME...MOT...LOC 0443Z 158DEG 23KT 3864 7553 

TORNADO...OBSERVED
HAIL...0.00IN

$$

Deal

166 
WWUS51 KPHI 090446
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
1246 AM EDT Fri Jul 9 2021

DEC005-090456-
/O.CAN.KPHI.TO.W.0007.000000T0000Z-210709T0500Z/
Sussex DE-
1246 AM EDT Fri Jul 9 2021

...THE TORNADO WARNING FOR CENTRAL SUSSEX COUNTY IS CANCELLED...
        
The storm which prompted the warning has weakened below severe
limits, and has exited the warned area. Therefore, the warning has
been cancelled.  However heavy rain is still possible with this
thunderstorm.

LAT...LON 3858 7552 3862 7556 3865 7554 3865 7548
      3860 7547
TIME...MOT...LOC 0444Z 158DEG 23KT 3866 7554 

$$

Deal

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 8, 10:19 PM EDT	Areal Flood Advisory	PHI	Kent, Sussex	5 hr
Jul 8, 11:37 PM EDT	Tornado Warning	PHI	Sussex	23 min
Jul 8, 11:59 PM EDT	Tornado Warning	PHI	Sussex	12 min
Jul 9, 12:04 AM EDT	Tornado Warning	PHI	Sussex	26 min
Jul 9, 12:28 AM EDT	Tornado Warning	PHI	Sussex	17 min
Jul 9, 4:54 PM EDT	Special Weather Statement	PHI	New Castle	66 min
Jul 9, 5:17 PM EDT	Severe Thunderstorm Warning	PHI	New Castle	43 min
Jul 9, 6:19 PM EDT	Severe Thunderstorm Warning	PHI	New Castle	41 min
Jul 9, 6:50 PM EDT	Areal Flood Advisory	PHI	New Castle	2 hr
Jul 9, 6:57 PM EDT	Severe Thunderstorm Warning	PHI	New Castle	63 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.