Alert archive / Maryland / Tornado Warnings in 2020

Tornado Warning 19, NWS Philadelphia/Mount Holly

August 4, 2020Kent County, Delaware; 4 counties in Maryland

NWS Philadelphia/Mount Holly issued this tornado warning at Aug 4, 2020, 8:27 AM EDT for Kent County, Delaware; 4 counties in Maryland. It was in force for 33 min. 1 report 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
Aug 4, 2020, 8:27 AM EDT (12:27 UTC)
Expired
Aug 4, 2020, 9:00 AM EDT
In force
33 min
Issued by
NWS Philadelphia/Mount Holly
Area
Storm-based polygon
Tornado
Radar indicated
Hail
0.0 in

Counties Kent County, DE, Caroline County, MD, Cecil County, MD, Kent County, MD, Queen Anne's County, MD

The radar

The Dover AFB radar (KDOX), 58 km from the middle of the area, began a volume at 12:27 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

TimeReportWhereRemark
Aug 4, 8:30 AM EDTTORNADOSandtown, DECALL CENTER REPORTS A TORNADO ON SANDTOWN ROAD. TIME ESTIMATED FROM RADAR.

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.

IssuedProductOfficeLasted
Aug 4, 2:26 AM EDTTornado WatchSPC9 hr

The nearest sounding before it

Wallops Is Stn, VA (KWAL), launched 12:00Z, 0.5 hours before the alert went out and 151 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 2020-08-04Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 472 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 2020-08-04The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 254 square meters per square second.1939587897Sfc1 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
472 J/kg
Mixed-layer CIN
-6 J/kg
Mixed-layer LCL
648 m above ground
0-6 km bulk shear
52 kt
0-1 km storm-relative helicity
254 m²/s²
0-3 km storm-relative helicity
273 m²/s²
Significant tornado parameter
0.8
Supercell composite
2.9

Open this sounding in Storm Lab

The text

As transmitted.

020 
WFUS51 KPHI 041227
TORPHI
DEC001-MDC011-015-029-035-041300-
/O.NEW.KPHI.TO.W.0019.200804T1227Z-200804T1300Z/

BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service Mount Holly NJ
827 AM EDT Tue Aug 4 2020

The National Weather Service in Mount Holly NJ has issued a

* Tornado Warning for...
  Southwestern Kent County in central Delaware...
  Northeastern Queen Anne's County in northeastern Maryland...
  Northeastern Caroline County in eastern Maryland...
  Northeastern Kent County in northeastern Maryland...
  Southern Cecil County in northeastern Maryland...

* Until 900 AM EDT.
    
* At 826 AM EDT, a severe thunderstorm capable of producing a tornado
  was located over Sandtown, or 14 miles southwest of Dover, moving
  northwest at 55 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...
  Millington, Sudlersville, Goldsboro, Morgnec, Massey, Crumpton,
  Sandtown, Kennedyville, Galena, Henderson, Marydel, Templeville and
  Barclay.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Protecting yourself from immediate threats to life and safety shall
take priority.  Whenever possible, as long as it does not cause
greater harm, all COVID-19 protective action guidance should be
followed.

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 3937 7591 3936 7589 3937 7584 3895 7563
      3893 7574 3931 7610
TIME...MOT...LOC 1226Z 149DEG 47KT 3902 7571 

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

$$

SFJ
2 follow-up statements
954 
WWUS51 KPHI 041241
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
841 AM EDT Tue Aug 4 2020

DEC001-MDC011-015-029-035-041300-
/O.CON.KPHI.TO.W.0019.000000T0000Z-200804T1300Z/
Kent DE-Queen Anne's MD-Caroline MD-Kent MD-Cecil MD-
841 AM EDT Tue Aug 4 2020

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 900 AM EDT FOR WEST
CENTRAL KENT...NORTHEASTERN QUEEN ANNE'S...NORTHEASTERN CAROLINE...
NORTHEASTERN KENT AND SOUTHERN CECIL COUNTIES...
    
At 840 AM EDT, a confirmed tornado was located over Sudlersville, or
15 miles northeast of Centerville, moving northwest at 55 mph.

HAZARD...Damaging tornado.

SOURCE...Law enforcement 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...
Millington, Sudlersville, Morgnec, Massey, Crumpton, Kennedyville,
Galena, Henderson, Marydel, Templeville and Barclay.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Protecting yourself from immediate threats to life and safety shall
take priority.  Whenever possible, as long as it does not cause
greater harm, all COVID-19 protective action guidance should be
followed.

To repeat, a tornado is 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.

&&

LAT...LON 3937 7591 3936 7589 3937 7584 3905 7568
      3904 7584 3931 7610
TIME...MOT...LOC 1240Z 149DEG 47KT 3919 7584 

TORNADO...OBSERVED
HAIL...0.00IN

$$

SFJ
201 
WWUS51 KPHI 041253
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
853 AM EDT Tue Aug 4 2020

DEC001-MDC011-015-029-035-041303-
/O.EXP.KPHI.TO.W.0019.000000T0000Z-200804T1300Z/
Kent DE-Queen Anne's MD-Caroline MD-Kent MD-Cecil MD-
853 AM EDT Tue Aug 4 2020

...THE TORNADO WARNING FOR WEST CENTRAL KENT...NORTHEASTERN QUEEN
ANNE'S...NORTHEASTERN CAROLINE...NORTHEASTERN KENT AND SOUTHERN CECIL
COUNTIES WILL EXPIRE AT 900 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.

A Tornado Watch remains in effect until noon EDT for central
Delaware...and eastern and northeastern Maryland.

LAT...LON 3937 7591 3936 7589 3937 7584 3905 7568
      3904 7584 3931 7610
TIME...MOT...LOC 1253Z 149DEG 47KT 3933 7595 

$$

SFJ

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 4, 4:50 AM EDTTornado WarningPHISussex25 min
Aug 4, 5:17 AM EDTAreal Flood AdvisoryPHINew Castle4 hr
Aug 4, 7:28 AM EDTFlash Flood WarningPHINew Castle3 hr
Aug 4, 7:39 AM EDTTornado WarningPHISussex36 min
Aug 4, 7:51 AM EDTTornado WarningPHISussex24 min
Aug 4, 8:15 AM EDTTornado WarningPHIKent45 min
Aug 4, 8:18 AM EDTTornado WarningPHISussex27 min
Aug 4, 8:56 AM EDTTornado WarningPHIKent, New Castle34 min
Aug 4, 8:58 AM EDTFlash Flood WarningPHIKent, New Castle, Sussex3 hr
Aug 4, 9:06 AM EDTRiver Flood WarningPHINew Castle11 hr
Aug 4, 9:23 AM EDTFlash Flood WarningPHINew Castle4 hr
Aug 4, 9:23 AM EDTTornado Warning Tornado observedPHINew Castle22 min
Aug 4, 10:02 AM EDTFlash Flood WarningPHINew Castle4 hr
Aug 4, 10:38 AM EDTRiver Flood WarningPHINew Castle14 hr
Aug 4, 12:27 PM EDTRiver Flood WarningPHINew Castle10 hr
Aug 4, 12:48 PM EDTRiver Flood WarningPHINew Castle24 hr
Aug 4, 1:59 PM EDTAreal Flood WarningPHINew Castle9 hr
Aug 4, 1:33 AM EDTAreal Flood AdvisoryPHICaroline, Kent, Queen Anne's, Talbot4 hr
Aug 4, 2:10 AM EDTFlash Flood WarningPHICaroline, Kent, Queen Anne's, Talbot4 hr
Aug 4, 6:55 AM EDTTornado WarningPHIKent, Queen Anne's35 min
Aug 4, 7:22 AM EDTTornado WarningPHIKent, Queen Anne's23 min
Aug 4, 7:50 AM EDTFlash Flood WarningPHICaroline, Kent, Queen Anne's, Talbot4 hr
Aug 4, 8:13 AM EDTTornado WarningPHIKent, Queen Anne's, Talbot26 min
Aug 4, 8:50 AM EDTFlash Flood WarningPHICaroline, Cecil, Kent, Queen Anne's4 hr

Nearby

Tornado Warnings in Maryland, 2020Tornado Warnings in Delaware, 2020Every tornado warning in 2020Tornadoes in 2020

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.