Alert archive / Maryland / Severe Thunderstorm Warnings in 2020

Severe Thunderstorm Warning 304, NWS Philadelphia/Mount Holly

November 30, 2020Kent County, New Castle County, Delaware; Caroline County, Kent County, Queen Anne's County, Maryland

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Nov 30, 2020, 3:04 PM EST for Kent County, New Castle County, Delaware; Caroline County, Kent County, Queen Anne's County, Maryland. It was in force for 56 min. 4 reports 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: Nov 30, 2020, 3:04 PM EST (20:04 UTC)
Expired: Nov 30, 2020, 4:00 PM EST
In force: 56 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon
Tornado: Possible
Hail: 0.75 in
Wind: 60.0 mph

Counties Kent County, DE, New Castle County, DE, Caroline County, MD, Kent County, MD, Queen Anne's County, MD

The radar

The Dover AFB radar (KDOX), 60 km from the middle of the area, began a volume at 20:05 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

Time	Report	Where	Remark
Nov 30, 3:13 PM EST	TORNADO	3 Wnw Henderson, MD	A TORNADO TOUCHED DOWN ALONG MARYLAND STATE ROUTE 313 AT 3:13 PM JUST SOUTH OF THE CAROLINE-QUEEN ANNE’S COUNTY BORDER. DAMAGE WAS SPARSE IN THIS AREA, BUT A VELOCITY COUPLET WAS FORMED AROUND THIS LOCATION WHEN VIEWED BY THE NEARBY NEXRAD KDOX IN DOVER DELAWA
Nov 30, 3:17 PM EST	TSTM WND DMG	2 Nnw Henderson, MD	DOWNED TREE AND WIRES NEAR SHULTS ROAD. TIME ESTIMATED FROM RADAR.
Nov 30, 3:22 PM EST	TSTM WND DMG	Marydel, DE	TREES DOWN, INCLUDING ONE ON A VEHICLE.
Nov 30, 3:30 PM EST	TSTM WND DMG	2 S Kenton, DE	CORRECTS PREVIOUS TSTM WND DMG REPORT FROM 2 S KENTON. SEVERAL TREES DOWN ACROSS THE NORTHERN PARTS OF KENT COUNTY. 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.

Issued	Product	Office	Lasted
Nov 30, 1:07 PM EST	Tornado Watch	SPC	6 hr

The nearest sounding before it

Washington/Dulle, VA (KIAD), launched 12:00Z, 8.1 hours before the alert went out and 142 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 498 m above ground
0-6 km bulk shear: 56 kt
0-1 km storm-relative helicity: 384 m²/s²
0-3 km storm-relative helicity: 623 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

036 
WUUS51 KPHI 302004
SVRPHI
DEC001-003-MDC011-029-035-302100-
/O.NEW.KPHI.SV.W.0304.201130T2004Z-201130T2100Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mount Holly NJ
304 PM EST Mon Nov 30 2020

The National Weather Service in Mount Holly NJ has issued a

* Severe Thunderstorm Warning for...
  Southwestern New Castle County in northern Delaware...
  Northern Kent County in central Delaware...
  Eastern Queen Anne's County in northeastern Maryland...
  Northeastern Caroline County in eastern Maryland...
  Northeastern Kent County in northeastern Maryland...

* Until 400 PM EST.

* At 303 PM EST, a severe thunderstorm was located over Hope, or near
  Centerville, moving northeast at 35 mph.

  HAZARD...60 mph wind gusts.

  SOURCE...Radar indicated.

  IMPACT...Damage to roofs, siding, trees, and power lines is 
           possible.

* Locations impacted include...
  Dover, Middletown, Smyrna, Centreville, Camden, Clayton,
  Greensboro, Oakland, Ridgely, Cheswold, Church Hill, Millington,
  Sudlersville, Goldsboro, Hartly, Woodland Beach, Jumptown,
  Hazlettville, Delaney Corner and Crumpton.

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.

A Tornado Watch remains in effect until 700 PM EST for central and
northern Delaware...and eastern and northeastern Maryland.

For your protection move to an interior room on the lowest floor of a
building.

&&

LAT...LON 3926 7598 3937 7585 3938 7582 3938 7577
      3944 7577 3955 7563 3923 7534 3889 7592
      3905 7605
TIME...MOT...LOC 2003Z 227DEG 32KT 3902 7595 

TORNADO...POSSIBLE
HAIL...<.75IN
WIND...60MPH
 
$$

Iovino

2 follow-up statements

036 
WWUS51 KPHI 302026
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
326 PM EST Mon Nov 30 2020

MDC011-029-035-302036-
/O.CAN.KPHI.SV.W.0304.000000T0000Z-201130T2100Z/
Queen Anne's MD-Caroline MD-Kent MD-
326 PM EST Mon Nov 30 2020

...THE SEVERE THUNDERSTORM WARNING FOR EASTERN QUEEN ANNE'S...
NORTHEASTERN CAROLINE AND NORTHEASTERN KENT COUNTIES IS CANCELLED...
    
The severe thunderstorm which prompted the warning has moved out of 
the warned area. Therefore, the warning has been cancelled.

A Tornado Watch remains in effect until 700 PM EST for central and
northern Delaware...and eastern and northeastern Maryland.

LAT...LON 3955 7563 3923 7534 3900 7573 3901 7574
      3944 7577
TIME...MOT...LOC 2026Z 227DEG 32KT 3916 7575 

$$

DEC001-003-302100-
/O.CON.KPHI.SV.W.0304.000000T0000Z-201130T2100Z/
New Castle DE-Kent DE-
326 PM EST Mon Nov 30 2020

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 400 PM EST
FOR SOUTHWESTERN NEW CASTLE AND NORTHERN KENT COUNTIES...

At 326 PM EST, a severe thunderstorm was located over Hartly, or 12
miles west of Dover, moving northeast at 35 mph.

HAZARD...60 mph wind gusts.

SOURCE...Radar indicated.

IMPACT...Damage to roofs, siding, trees, and power lines is 
         possible.

Locations impacted include...
Dover, Middletown, Smyrna, Camden, Clayton, Cheswold, Hartly,
Woodland Beach, Green Spring, Hazlettville, Delaney Corner, Dover
Speedway, Sandtown, Townsend, Wyoming, Odessa, Kenton, Little Creek,
Leipsic and Marydel.

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.

A Tornado Watch remains in effect until 700 PM EST for central and
northern Delaware...and eastern and northeastern Maryland.

For your protection move to an interior room on the lowest floor of a
building.

&&

LAT...LON 3955 7563 3923 7534 3900 7573 3901 7574
      3944 7577
TIME...MOT...LOC 2026Z 227DEG 32KT 3916 7575 

TORNADO...POSSIBLE
HAIL...<.75IN
WIND...60MPH
 
$$

Iovino

997 
WWUS51 KPHI 302044
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
344 PM EST Mon Nov 30 2020

DEC001-003-302100-
/O.CON.KPHI.SV.W.0304.000000T0000Z-201130T2100Z/
New Castle DE-Kent DE-
344 PM EST Mon Nov 30 2020

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 400 PM EST
FOR SOUTH CENTRAL NEW CASTLE AND NORTHEASTERN KENT COUNTIES...

At 343 PM EST, a severe thunderstorm was located over Smyrna, or 8
miles northwest of Dover, moving northeast at 35 mph.

HAZARD...60 mph wind gusts.

SOURCE...Radar indicated.

IMPACT...Damage to roofs, siding, trees, and power lines is 
         possible.

Locations impacted include...
Smyrna, Woodland Beach, Leipsic and Chambersville. 

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.

A Tornado Watch remains in effect until 700 PM EST for central and
northern Delaware.

For your protection move to an interior room on the lowest floor of a
building.

&&

LAT...LON 3950 7560 3923 7534 3923 7546 3924 7555
      3933 7565
TIME...MOT...LOC 2043Z 227DEG 32KT 3927 7560 

TORNADO...POSSIBLE
HAIL...<.75IN
WIND...60MPH
 
$$

Iovino

The office that day

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

Issued	Product	Office	Counties	Lasted
Nov 30, 11:35 AM EST	River Flood Warning	PHI	New Castle	11 hr
Nov 30, 12:15 PM EST	Areal Flood Advisory	PHI	New Castle	3 hr
Nov 30, 2:01 PM EST	Coastal Flood Statement	PHI	Sussex	3 hr
Nov 30, 2:41 PM EST	Severe Thunderstorm Warning	PHI	New Castle	49 min
Nov 30, 2:48 PM EST	Areal Flood Warning	PHI	New Castle	8 hr
Nov 30, 3:01 PM EST	Severe Thunderstorm Warning	PHI	New Castle	44 min
Nov 30, 3:21 PM EST	Tornado Warning Tornado observed	PHI	Kent	24 min
Nov 30, 3:47 PM EST	Tornado Warning	PHI	Kent	28 min
Nov 30, 5:24 PM EST	River Flood Warning	PHI	New Castle	5 hr
Nov 30, 5:39 PM EST	River Flood Warning	PHI	New Castle	4 hr
Nov 30, 3:11 PM EST	Tornado Warning	PHI	Caroline, Queen Anne's	17 min

Nearby

Severe Thunderstorm Warnings in Maryland, 2020 Severe Thunderstorm Warnings in Delaware, 2020 Every severe thunderstorm warning 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.