Alert archive / Delaware / Tornado Warnings in 2021

Tornado Warning 41, NWS Philadelphia/Mount Holly

September 1, 2021Kent County, New Castle County, Delaware; Cumberland County, Salem County, New Jersey

NWS Philadelphia/Mount Holly issued this tornado warning at Sep 1, 2021, 5:35 PM EDT for Kent County, New Castle County, Delaware; Cumberland County, Salem County, New Jersey. It was in force for 25 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
Sep 1, 2021, 5:35 PM EDT (21:35 UTC)
Expired
Sep 1, 2021, 6:00 PM EDT
In force
25 min
Issued by
NWS Philadelphia/Mount Holly
Area
Storm-based polygon
Tornado
Radar indicated
Hail
0.75 in

Counties Kent County, DE, New Castle County, DE, Cumberland County, NJ, Salem County, NJ

The radar

The Dover AFB radar (KDOX), 68 km from the middle of the area, began a volume at 21:35 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 watch it was issued in

The SPC watch in force over the same counties when this warning went out.

IssuedProductOfficeLasted
Sep 1, 12:40 PM EDTTornado WatchSPC9 hr

The nearest sounding before it

Wallops Is Stn, VA (KWAL), launched 12:00Z, 9.6 hours before the alert went out and 167 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-pSkew-T log-p diagram, Wallops Is Stn, VA at 12:00Z on 2021-09-01Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 515 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Wallops Is Stn, VA at 12:00Z on 2021-09-01The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 57 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
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
515 J/kg
Mixed-layer CIN
-76 J/kg
Mixed-layer LCL
955 m above ground
0-6 km bulk shear
29 kt
0-1 km storm-relative helicity
57 m²/s²
0-3 km storm-relative helicity
89 m²/s²
Significant tornado parameter
0.1
Supercell composite
1.3

Open this sounding in Storm Lab

The text

As transmitted.

547 
WFUS51 KPHI 012135
TORPHI
DEC001-003-NJC011-033-012200-
/O.NEW.KPHI.TO.W.0041.210901T2135Z-210901T2200Z/

BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service Mount Holly NJ
535 PM EDT Wed Sep 1 2021

The National Weather Service in Mount Holly NJ has issued a

* Tornado Warning for...
  South central New Castle County in northern Delaware...
  North central Kent County in central Delaware...
  Northwestern Cumberland County in southern New Jersey...
  Southern Salem County in southern New Jersey...

* Until 600 PM EDT.
    
* At 535 PM EDT, a severe thunderstorm capable of producing a tornado
  was located near Woodland Beach, or 10 miles southeast of
  Middletown, moving northeast 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...
  Pennsville, Carneys Point, Salem, Alloway, Quinton, Greenwich,
  Shiloh, Woodland Beach, Olivet, Hancocks Bridge, Newport Meadows,
  Hope Creek, Seabrook Farms, Chambersville and Centerton.

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 3929 7549 3937 7561 3968 7548 3955 7510
TIME...MOT...LOC 2135Z 218DEG 36KT 3938 7553 

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

$$

Staarmann
1 follow-up statement
754 
WWUS51 KPHI 012145
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
545 PM EDT Wed Sep 1 2021

DEC001-003-012155-
/O.CAN.KPHI.TO.W.0041.000000T0000Z-210901T2200Z/
New Castle DE-Kent DE-
545 PM EDT Wed Sep 1 2021

...THE TORNADO WARNING FOR SOUTH CENTRAL NEW CASTLE AND NORTH CENTRAL
KENT COUNTIES IS CANCELLED...
    
The tornadic thunderstorm which prompted the warning has weakened. 
moved out of the warned area. Therefore, the warning has been 
cancelled.

A Tornado Watch remains in effect until 1000 PM EDT for southern New
Jersey.

LAT...LON 3966 7549 3968 7548 3961 7526 3958 7518
      3939 7544 3943 7552 3947 7555
TIME...MOT...LOC 2145Z 212DEG 34KT 3946 7547 

$$

NJC011-033-012200-
/O.CON.KPHI.TO.W.0041.000000T0000Z-210901T2200Z/
Cumberland NJ-Salem NJ-
545 PM EDT Wed Sep 1 2021

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 600 PM EDT FOR
NORTHWESTERN CUMBERLAND AND SOUTHWESTERN SALEM COUNTIES...
    
At 545 PM EDT, a severe thunderstorm capable of producing a tornado
was located over Hancocks Bridge, or 12 miles west of Bridgeton,
moving northeast 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...
Pennsville, Carneys Point, Salem, Alloway, Quinton, Hancocks Bridge,
Newport Meadows and Hope Creek.

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 3966 7549 3968 7548 3961 7526 3958 7518
      3939 7544 3943 7552 3947 7555
TIME...MOT...LOC 2145Z 212DEG 34KT 3946 7547 

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

$$

Staarmann

The office that day

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

IssuedProductOfficeCountiesLasted
Sep 1, 6:19 AM EDTAreal Flood AdvisoryPHINew Castle116 min
Sep 1, 6:49 AM EDTFlash Flood WarningPHINew Castle86 min
Sep 1, 8:03 AM EDTRiver Flood WarningPHINew Castle4 hr
Sep 1, 2:53 PM EDTFlash Flood WarningPHINew Castle9 hr
Sep 1, 4:59 PM EDTTornado WarningPHIKent, Sussex46 min
Sep 1, 5:01 PM EDTTornado WarningPHIKent, New Castle44 min
Sep 1, 5:16 PM EDTSevere Thunderstorm WarningPHIKent, Sussex44 min
Sep 1, 5:26 PM EDTFlash Flood WarningPHINew Castle9 hr
Sep 1, 6:03 PM EDTSevere Thunderstorm WarningPHIKent, Sussex42 min
Sep 1, 6:08 PM EDTRiver Flood WarningPHINew Castle18 hr
Sep 1, 6:15 PM EDTRiver Flood WarningPHINew Castle9 hr
Sep 1, 6:24 PM EDTTornado WarningPHINew Castle16 min
Sep 1, 6:38 PM EDTRiver Flood WarningPHINew Castle28 hr
Sep 1, 6:57 PM EDTSevere Thunderstorm WarningPHIKent, Sussex63 min
Sep 1, 7:44 PM EDTRiver Flood WarningPHINew Castle11 hr
Sep 1, 3:23 AM EDTGale WarningPHI32 hr
Sep 1, 3:23 AM EDTSmall Craft AdvisoryPHI41 hr
Sep 1, 4:34 AM EDTRip Current StatementPHIAtlantic, Cape May, Monmouth, Ocean39 hr
Sep 1, 7:58 AM EDTSevere Thunderstorm WarningPHIBurlington, Ocean47 min
Sep 1, 8:39 AM EDTSevere Thunderstorm WarningPHIMonmouth, Ocean39 min
Sep 1, 9:11 AM EDTSpecial Marine WarningPHI64 min
Sep 1, 11:24 AM EDTAreal Flood AdvisoryPHISussex, Warren3 hr
Sep 1, 4:04 PM EDTAreal Flood WarningPHIWarren24 hr
Sep 1, 4:12 PM EDTFlash Flood WarningPHIHunterdon, Warren7 hr
Sep 1, 4:27 PM EDTRiver Flood WarningPHIMorris, Somerset6 days
Sep 1, 4:27 PM EDTRiver Flood WarningPHIEssex, Morris, Passaic8 days
Sep 1, 4:27 PM EDTRiver Flood WarningPHIEssex, Morris, Passaic6 days
Sep 1, 4:27 PM EDTRiver Flood WarningPHIEssex, Passaic21 days
Sep 1, 4:33 PM EDTRiver Flood WarningPHIMorris, Passaic46 hr
Sep 1, 4:40 PM EDTRiver Flood WarningPHIHunterdon, Somerset36 hr
Sep 1, 4:40 PM EDTRiver Flood WarningPHISomerset22 hr
Sep 1, 4:40 PM EDTRiver Flood WarningPHIMiddlesex, Somerset42 hr
Sep 1, 4:40 PM EDTRiver Flood WarningPHIMiddlesex, Somerset48 hr
Sep 1, 4:41 PM EDTRiver Flood WarningPHISomerset61 hr
Sep 1, 5:13 PM EDTSevere Thunderstorm WarningPHIHunterdon, Mercer47 min
Sep 1, 5:33 PM EDTSpecial Marine WarningPHI27 min
Sep 1, 5:34 PM EDTTornado WarningPHIMercer26 min
Sep 1, 5:42 PM EDTFlash Flood WarningPHIHunterdon, Mercer, Morris, Somerset, Warren10 hr
Sep 1, 5:57 PM EDTTornado WarningPHIGloucester, Salem33 min
Sep 1, 5:57 PM EDTTornado WarningPHIHunterdon, Mercer, Somerset33 min
Sep 1, 6:05 PM EDTFlash Flood WarningPHIHunterdon, Mercer, Middlesex, Morris, Somerset10 hr
Sep 1, 6:08 PM EDTFlash Flood WarningPHIHunterdon, Morris, Somerset, Sussex, Warren6 hr
Sep 1, 6:14 PM EDTSpecial Marine WarningPHI61 min
Sep 1, 6:20 PM EDTTornado WarningPHIHunterdon, Mercer, Somerset40 min
Sep 1, 6:22 PM EDTTornado Warning Tornado observedPHIBurlington, Camden, Gloucester23 min
Sep 1, 6:42 PM EDTTornado WarningPHIBurlington, Camden33 min
Sep 1, 6:59 PM EDTSevere Thunderstorm WarningPHIHunterdon, Mercer, Middlesex, Monmouth, Morris, Somerset61 min
Sep 1, 7:04 PM EDTTornado Warning EmergencyTornado observedCatastrophic damage threatPHIBurlington, Mercer26 min
Sep 1, 7:22 PM EDTTornado WarningPHIHunterdon, Mercer11 min
Sep 1, 7:28 PM EDTTornado WarningPHIMercer, Middlesex, Morris, Somerset47 min
Sep 1, 7:31 PM EDTFlash Flood Warning EmergencyCatastrophic damage threatPHIHunterdon, Mercer, Somerset4 hr
Sep 1, 7:44 PM EDTSpecial Marine WarningPHI61 min

Nearby

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