Alert archive / Delaware / Tornado Warnings in 2021

Tornado Warning 6, NWS Philadelphia/Mount Holly

July 9, 2021Sussex County, Delaware

NWS Philadelphia/Mount Holly issued this tornado warning at Jul 9, 2021, 12:04 AM EDT for Sussex County, Delaware. It was in force for 26 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, 12:04 AM EDT (04:04 UTC)
Expired: Jul 9, 2021, 12:30 AM EDT
In force: 26 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), 29 km from the middle of the area, began a volume at 04:07 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, 4.1 hours before the alert went out and 93 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.

618 
WFUS51 KPHI 090404
TORPHI
DEC005-090430-
/O.NEW.KPHI.TO.W.0006.210709T0404Z-210709T0430Z/

BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service Mount Holly NJ
1204 AM EDT Fri Jul 9 2021

The National Weather Service in Mount Holly NJ has issued a

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

* Until 1230 AM EDT.
    
* At 1203 AM EDT, a severe thunderstorm capable of producing a
  tornado was located near Henlopen Acres, or 16 miles east of
  Georgetown, moving northwest 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...
  Lewes, Henlopen Acres, Cape Henlopen State Park and Dewey Beach. 

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 3865 7501 3861 7510 3880 7528 3887 7524
      3886 7511
TIME...MOT...LOC 0403Z 148DEG 38KT 3867 7508 

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

$$

BAH

3 follow-up statements

098 
WWUS51 KPHI 090413
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
1213 AM EDT Fri Jul 9 2021

DEC005-090430-
/O.CON.KPHI.TO.W.0006.000000T0000Z-210709T0430Z/
Sussex DE-
1213 AM EDT Fri Jul 9 2021

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 1230 AM EDT FOR
NORTHEASTERN SUSSEX COUNTY...
    
At 1213 AM EDT, a severe thunderstorm capable of producing a tornado
was located over Lewes, or 13 miles east of Georgetown, moving
northwest at 40 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...
Lewes, Henlopen Acres and Cape Henlopen State Park. 

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 3873 7505 3868 7513 3880 7528 3887 7524
      3886 7515 3881 7509
TIME...MOT...LOC 0413Z 147DEG 37KT 3874 7514 

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

$$

Deal

214 
WWUS51 KPHI 090421
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
1221 AM EDT Fri Jul 9 2021

DEC005-090430-
/O.CON.KPHI.TO.W.0006.000000T0000Z-210709T0430Z/
Sussex DE-
1221 AM EDT Fri Jul 9 2021

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 1230 AM EDT FOR
NORTHEASTERN SUSSEX COUNTY...
    
At 1221 AM EDT, a severe thunderstorm capable of producing a tornado
was located over Lewes, or 12 miles northeast of Georgetown, moving
northwest at 35 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...
Lewes.

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 3876 7512 3873 7519 3880 7528 3887 7524
      3886 7515
TIME...MOT...LOC 0421Z 143DEG 29KT 3878 7518 

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

$$

Deal

702 
WWUS51 KPHI 090429
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
1229 AM EDT Fri Jul 9 2021

DEC005-090439-
/O.EXP.KPHI.TO.W.0006.000000T0000Z-210709T0430Z/
Sussex DE-
1229 AM EDT Fri Jul 9 2021

...THE TORNADO WARNING FOR NORTHEASTERN SUSSEX COUNTY WILL EXPIRE AT
1230 AM EDT...
                
The storm which prompted the warning has weakened below severe
limits, and no longer appears capable of producing a tornado.
Therefore, the warning will be allowed to expire.

To report severe weather, contact your nearest law enforcement
agency. They will relay your report to the National Weather Service
Mount Holly NJ.

LAT...LON 3876 7512 3873 7519 3880 7528 3887 7524
      3886 7515
TIME...MOT...LOC 0429Z 148DEG 38KT 3883 7522 

$$

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, 12:11 AM EDT	Tornado Warning	PHI	Sussex	35 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.