Alert archive / Delaware / Tornado Warnings in 2021

Tornado Warning 5, NWS Philadelphia/Mount Holly

July 8, 2021Sussex County, Delaware

NWS Philadelphia/Mount Holly issued this tornado warning at Jul 8, 2021, 11:59 PM EDT for Sussex County, Delaware. It was in force for 12 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 8, 2021, 11:59 PM EDT (03:59 UTC)
Expired: Jul 9, 2021, 12:11 AM EDT
In force: 12 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), 18 km from the middle of the area, began a volume at 04:01 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, 4.0 hours before the alert went out and 88 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.

518 
WFUS51 KPHI 090359
TORPHI
DEC005-090430-
/O.NEW.KPHI.TO.W.0005.210709T0359Z-210709T0430Z/

BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service Mount Holly NJ
1159 PM EDT Thu Jul 8 2021

The National Weather Service in Mount Holly NJ has issued a

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

* Until 1230 AM EDT.
    
* At 1157 PM EDT, a severe thunderstorm capable of producing a
  tornado was located near Millsboro, or 8 miles east 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...
  Georgetown and Milton. 

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 3864 7517 3861 7525 3876 7545 3883 7538
      3883 7526
TIME...MOT...LOC 0357Z 147DEG 26KT 3866 7524 

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

$$

BAH

2 follow-up statements

619 
WWUS51 KPHI 090405
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
1205 AM EDT Fri Jul 9 2021

DEC005-090430-
/O.CON.KPHI.TO.W.0005.000000T0000Z-210709T0430Z/
Sussex DE-
1205 AM EDT Fri Jul 9 2021

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 1230 AM EDT FOR CENTRAL
SUSSEX COUNTY...
    
At 1205 AM EDT, a severe thunderstorm capable of producing a tornado
was located over Milton, or near 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...
Milton.

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 3872 7523 3868 7528 3877 7543 3883 7538
      3883 7528
TIME...MOT...LOC 0405Z 144DEG 31KT 3875 7530 

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

$$

Deal

454 
WWUS51 KPHI 090411
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
1211 AM EDT Fri Jul 9 2021

DEC005-090420-
/O.CAN.KPHI.TO.W.0005.000000T0000Z-210709T0430Z/
Sussex DE-
1211 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 no longer appears capable of producing a tornado.
Therefore, the warning has been cancelled.  However heavy rain is
still possible with this thunderstorm.

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

Remember, a Tornado Warning still remains in effect for eastern 
Sussex county until 1230 AM EDT.

LAT...LON 3872 7523 3868 7528 3877 7543 3883 7538
      3883 7528
TIME...MOT...LOC 0409Z 147DEG 26KT 3878 7532 

$$

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 9, 12:04 AM EDT	Tornado Warning	PHI	Sussex	26 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.