Alert archive / Maryland / Severe Thunderstorm Warnings in 2020

Severe Thunderstorm Warning 206, NWS Philadelphia/Mount Holly

August 6, 2020Kent County, New Castle County, Sussex County, Delaware; 4 counties in Maryland

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Aug 6, 2020, 6:13 AM EDT for Kent County, New Castle County, Sussex County, Delaware; 4 counties in Maryland. It was in force for 62 min. 15 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: Aug 6, 2020, 6:13 AM EDT (10:13 UTC)
Expired: Aug 6, 2020, 7:15 AM EDT
In force: 62 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon
Tornado: Possible
Hail: 0.75 in
Wind: 70.0 mph

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

The radar

The Dover AFB radar (KDOX), 52 km from the middle of the area, began a volume at 10:15 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
Aug 6, 6:15 AM EDT	TSTM WND DMG	Chestertown, MD	SEVERAL REPORTS OF DOWNED TREES AND WIRES IN CHESTERTOWN. TIME ESTIMATED FROM RADAR.
Aug 6, 6:18 AM EDT	TSTM WND DMG	Church Hill, MD	WIRES DOWNED IN CHURCH HILL. TIME ESTIMATED FROM RADAR.
Aug 6, 6:18 AM EDT	TSTM WND DMG	Church Hill, MD	WIRES DOWNED IN CHURCH HILL. TIME ESTIMATED FROM RADAR.
Aug 6, 6:20 AM EDT	TSTM WND DMG	2 N Hambleton, MD	DOWNED WIRES NEAR U.S. HIGHWAY 50 NEAR BOH BROOKS ROAD. TIME ESTIMATED FROM RADAR.
Aug 6, 6:22 AM EDT	TSTM WND DMG	1 N Easton, MD	DOWNED WIRES ON WILLIS AVENUE NEAR ARBOR PLACE. TIME ESTIMATED FROM RADAR.
Aug 6, 6:28 AM EDT	TSTM WND DMG	3 Wnw Sudlersville, MD	DOWNED TREES AND WIRES NEAR THE INTERSECTION OF U.S. HIGHWAY 301 AND STATE HIGHWAY 290. TIME ESTIMATED FROM RADAR.
Aug 6, 6:28 AM EDT	TSTM WND DMG	3 Wnw Sudlersville, MD	DOWNED TREES AND WIRES NEAR THE INTERSECTION OF U.S. HIGHWAY 301 AND STATE HIGHWAY 290. TIME ESTIMATED FROM RADAR.
Aug 6, 6:30 AM EDT	TSTM WND DMG	1 Nnw Millington, MD	SEVERAL REPORTS OF DOWNED TREES AND WIRES NEAR MILLINGTON. TIME ESTIMATED FROM RADAR.
Aug 6, 6:31 AM EDT	TSTM WND DMG	Massey, MD	SEVERAL REPORTS OF DOWNED WIRES IN AND NEAR MASSEY. TIME ESTIMATED FROM RADAR.
Aug 6, 6:33 AM EDT	TSTM WND DMG	1 S Tanyard, MD	DOWNED POWER LINES NEAR TANYARD. TIME ESTIMATED FROM RADAR.
Aug 6, 6:36 AM EDT	TSTM WND DMG	2 Sse Templeville, MD	SEVERAL REPORTS OF POWER LINES DOWN IN THE MARYDEL AND TEMPLEVILLE AREAS. TIME ESTIMATED FROM RADAR.
Aug 6, 6:36 AM EDT	TSTM WND DMG	Goldsboro, MD	DOWNED WIRES NEAR THE GOLDSBORO AREA. TIME ESTIMATED FROM RADAR.
Aug 6, 6:36 AM EDT	TSTM WND DMG	Hartly, DE	REPORTS OF WIRES DOWN IN THE HARTLY AREA. TIME ESTIMATED FROM RADAR.
Aug 6, 6:58 AM EDT	TSTM WND DMG	2 Wsw Clayton, DE	SEVERAL REPORTS OF TREES AND WIRES DOWN NEAR MILLINGTON ROAD IN WESTERN KENT COUNTY. TIME ESTIMATED FROM RADAR.
Aug 6, 7:01 AM EDT	TSTM WND DMG	Clayton, DE	DOWNED TREES AND WIRES NEAR AND SOUTH OF CLAYTON. TIME ESTIMATED FROM RADAR.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Wallops Is Stn, VA (KWAL), launched 00:00Z, 10.2 hours before the alert went out and 115 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: 1920 J/kg
Mixed-layer CIN: -9 J/kg
Mixed-layer LCL: 772 m above ground
0-6 km bulk shear: 17 kt
0-1 km storm-relative helicity: -6 m²/s²
0-3 km storm-relative helicity: 20 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

080 
WUUS51 KPHI 061013
SVRPHI
DEC001-003-005-MDC011-029-035-041-061115-
/O.NEW.KPHI.SV.W.0206.200806T1013Z-200806T1115Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mount Holly NJ
613 AM EDT Thu Aug 6 2020

The National Weather Service in Mount Holly NJ has issued a

* Severe Thunderstorm Warning for...
  West central Sussex County in southern Delaware...
  Southwestern New Castle County in northern Delaware...
  Western Kent County in central Delaware...
  Talbot County in eastern Maryland...
  Queen Anne's County in northeastern Maryland...
  Caroline County in eastern Maryland...
  Kent County in northeastern Maryland...

* Until 715 AM EDT.

* At 612 AM EDT, severe thunderstorms were located along a line
  extending from near Kennedyville to near Trappe, moving east at 25
  mph.

  HAZARD...70 mph wind gusts and penny size hail.

  SOURCE...Radar indicated.

  IMPACT...Expect considerable tree damage. Damage is likely to 
           mobile homes, roofs, and outbuildings.

* Locations impacted include...
  Easton, Centerville, Smyrna, Chestertown, Denton, Centreville,
  Clayton, Federalsburg, Greensboro, Oakland, Ridgely, Trappe, St.
  Michaels, Church Hill, Preston, Oxford, Millington, Sudlersville,
  Goldsboro and Queen Anne.

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.

Remain alert for a possible tornado! Tornadoes can develop quickly
from severe thunderstorms. If you spot a tornado go at once into the
basement or small central room in a sturdy structure.

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

In addition to large hail and damaging winds, frequent cloud to
ground lightning is occurring with these storms. Move indoors
immediately. Remember, if you can hear thunder, you are close enough
to be struck by lightning.

&&

LAT...LON 3852 7570 3865 7571 3871 7584 3868 7593
      3857 7604 3874 7623 3876 7622 3875 7625
      3873 7627 3883 7626 3879 7619 3883 7619
      3897 7625 3900 7617 3903 7624 3925 7623
      3936 7612 3941 7560 3851 7565
TIME...MOT...LOC 1012Z 260DEG 20KT 3928 7603 3865 7610 

TORNADO...POSSIBLE
HAIL...0.75IN
WIND...70MPH
 
$$

CMS

5 follow-up statements

693 
WWUS51 KPHI 061024
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
624 AM EDT Thu Aug 6 2020

DEC001-003-005-MDC011-029-035-041-061115-
/O.CON.KPHI.SV.W.0206.000000T0000Z-200806T1115Z/
Sussex DE-New Castle DE-Kent DE-Talbot MD-Queen Anne's MD-
Caroline MD-Kent MD-
624 AM EDT Thu Aug 6 2020

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 715 AM EDT
FOR WEST CENTRAL SUSSEX...SOUTHWESTERN NEW CASTLE...WESTERN KENT...
TALBOT...QUEEN ANNE'S...CAROLINE AND KENT COUNTIES...

At 623 AM EDT, severe thunderstorms were located along a line
extending from Kennedyville to Trappe, moving east at 25 mph.

HAZARD...70 mph wind gusts and penny size hail.

SOURCE...Law enforcement. Widespread power outages have been 
         reported in Rock Hall with power lines down in the area.

IMPACT...Expect considerable tree damage. Damage is likely to mobile 
         homes, roofs, and outbuildings.

Locations impacted include...
Easton, Centerville, Smyrna, Chestertown, Denton, Centreville,
Clayton, Federalsburg, Greensboro, Oakland, Ridgely, Trappe, St.
Michaels, Church Hill, Preston, Oxford, Millington, Sudlersville,
Goldsboro and Queen Anne.

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.

Remain alert for a possible tornado! Tornadoes can develop quickly
from severe thunderstorms. If you spot a tornado go at once into the
basement or small central room in a sturdy structure.

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

Frequent cloud to ground lightning is occurring with these storms.
Move indoors immediately. Lightning is one of nature's leading
killers. Remember, if you can hear thunder, you are close enough to
be struck by lightning.

&&

LAT...LON 3852 7570 3865 7571 3871 7584 3868 7593
      3857 7604 3874 7623 3876 7622 3875 7625
      3873 7627 3883 7626 3879 7619 3883 7619
      3897 7625 3900 7617 3903 7624 3925 7623
      3936 7612 3941 7560 3851 7565
TIME...MOT...LOC 1023Z 260DEG 20KT 3929 7597 3866 7604 

TORNADO...POSSIBLE
HAIL...0.75IN
WIND...70MPH
 
$$

CMS

233 
WWUS51 KPHI 061030
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
630 AM EDT Thu Aug 6 2020

DEC001-003-005-MDC011-029-035-041-061115-
/O.CON.KPHI.SV.W.0206.000000T0000Z-200806T1115Z/
Sussex DE-New Castle DE-Kent DE-Talbot MD-Queen Anne's MD-
Caroline MD-Kent MD-
630 AM EDT Thu Aug 6 2020

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 715 AM EDT
FOR WEST CENTRAL SUSSEX...SOUTHWESTERN NEW CASTLE...WESTERN KENT...
TALBOT...QUEEN ANNE'S...CAROLINE AND KENT COUNTIES...

At 629 AM EDT, severe thunderstorms were located along a line 
extending from Massey to near Hambleton, moving east at 25 mph. The 
most dangerous portion of the storm is near Massey and Millington.

HAZARD...70 mph wind gusts and quarter size hail.

SOURCE...Law enforcement. Trees and wires are reported down in the 
         Rock Hall area.

IMPACT...Minor damage to vehicles is possible. Expect considerable 
         tree damage. Wind damage is also likely to mobile homes, 
         roofs, and outbuildings.

Locations impacted include...
Easton, Centerville, Smyrna, Chestertown, Denton, Centreville,
Clayton, Federalsburg, Greensboro, Oakland, Ridgely, Trappe, Church
Hill, Preston, Oxford, Millington, Sudlersville, Goldsboro, Queen
Anne and Hartly.

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.

Remain alert for a possible tornado! Tornadoes can develop quickly
from severe thunderstorms. If you spot a tornado go at once into the
basement or small central room in a sturdy structure.

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

Frequent cloud to ground lightning is occurring with these storms.
Move indoors immediately. Lightning is one of nature's leading
killers. Remember, if you can hear thunder, you are close enough to
be struck by lightning.

&&

LAT...LON 3852 7570 3865 7571 3871 7584 3868 7593
      3857 7604 3874 7623 3876 7622 3879 7619
      3883 7619 3900 7617 3925 7614 3936 7612
      3941 7560 3851 7565
TIME...MOT...LOC 1029Z 252DEG 21KT 3929 7581 3868 7603 

TORNADO...POSSIBLE
HAIL...1.00IN
WIND...70MPH
 
$$

CMS

395 
WWUS51 KPHI 061044
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
644 AM EDT Thu Aug 6 2020

DEC001-003-005-MDC011-029-035-041-061115-
/O.CON.KPHI.SV.W.0206.000000T0000Z-200806T1115Z/
Sussex DE-New Castle DE-Kent DE-Talbot MD-Queen Anne's MD-
Caroline MD-Kent MD-
644 AM EDT Thu Aug 6 2020

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 715 AM EDT
FOR WEST CENTRAL SUSSEX...SOUTHWESTERN NEW CASTLE...WESTERN KENT...
EASTERN TALBOT...EASTERN QUEEN ANNE'S...CAROLINE AND NORTHEASTERN
KENT COUNTIES...

At 643 AM EDT, severe thunderstorms were located along a line
extending from Delaney Corner to Choptank, moving east at 25 mph.

HAZARD...70 mph wind gusts and quarter size hail.

SOURCE...Law enforcement. Several reports of wind damage have been 
         received from Chestertown, Millington, and Crumpton with 
         these storms.

IMPACT...Minor damage to vehicles is possible. Expect considerable 
         tree damage. Wind damage is also likely to mobile homes, 
         roofs, and outbuildings.

Locations impacted include...
Smyrna, Denton, Clayton, Federalsburg, Greensboro, Oakland, Ridgely,
Church Hill, Preston, Millington, Sudlersville, Goldsboro, Queen
Anne, Hartly, Smithville, Starr, Jumptown, Hazlettville, Agner and
Choptank.

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.

Remain alert for a possible tornado! Tornadoes can develop quickly
from severe thunderstorms. If you spot a tornado go at once into the
basement or small central room in a sturdy structure.

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

Frequent cloud to ground lightning is occurring with these storms.
Move indoors immediately. Lightning is one of nature's leading
killers. Remember, if you can hear thunder, you are close enough to
be struck by lightning.

&&

LAT...LON 3852 7570 3865 7571 3871 7584 3868 7593
      3857 7604 3873 7602 3897 7604 3937 7597
      3941 7560 3851 7565
TIME...MOT...LOC 1043Z 260DEG 20KT 3930 7572 3869 7594 

TORNADO...POSSIBLE
HAIL...1.00IN
WIND...70MPH
 
$$

CMS

140 
WWUS51 KPHI 061101
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
701 AM EDT Thu Aug 6 2020

MDC041-061110-
/O.CAN.KPHI.SV.W.0206.000000T0000Z-200806T1115Z/
Talbot MD-
701 AM EDT Thu Aug 6 2020

...THE SEVERE THUNDERSTORM WARNING FOR EASTERN TALBOT COUNTY IS
CANCELLED...

The storms which prompted the warning have moved out of the warned 
area. Therefore, the warning has been cancelled.

LAT...LON 3852 7570 3865 7571 3871 7584 3868 7593
      3898 7584 3938 7586 3941 7560 3851 7565
TIME...MOT...LOC 1100Z 260DEG 20KT 3931 7561 3870 7583 

$$

DEC001-003-005-MDC011-029-035-061115-
/O.CON.KPHI.SV.W.0206.000000T0000Z-200806T1115Z/
Sussex DE-New Castle DE-Kent DE-Queen Anne's MD-Caroline MD-Kent MD-
701 AM EDT Thu Aug 6 2020

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 715 AM EDT
FOR WEST CENTRAL SUSSEX...SOUTHWESTERN NEW CASTLE...WESTERN KENT...
NORTHEASTERN QUEEN ANNE'S...CAROLINE AND NORTHEASTERN KENT
COUNTIES...

At 700 AM EDT, severe thunderstorms were located along a line
extending from Smyrna to near Federalsburg, moving east at 25 mph.

HAZARD...70 mph wind gusts and quarter size hail.

SOURCE...Law enforcement. Several reports of trees and wires down 
         have been received in the Millington, Crumpton, 
         Chestertown, and Church Hill areas.

IMPACT...Minor damage to vehicles is possible. Expect considerable 
         tree damage. Wind damage is also likely to mobile homes, 
         roofs, and outbuildings.

Locations impacted include...
Smyrna, Denton, Clayton, Federalsburg, Greensboro, Preston,
Millington, Sudlersville, Goldsboro, Hartly, Smithville,
Hazlettville, Agner, Delaney Corner, Sandtown, Andrewsville,
Sassafras, Harmony, Green Spring and Massey.

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.

Remain alert for a possible tornado! Tornadoes can develop quickly
from severe thunderstorms. If you spot a tornado go at once into the
basement or small central room in a sturdy structure.

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

Frequent cloud to ground lightning is occurring with these storms.
Move indoors immediately. Lightning is one of nature's leading
killers. Remember, if you can hear thunder, you are close enough to
be struck by lightning.

&&

LAT...LON 3852 7570 3865 7571 3871 7584 3868 7593
      3898 7584 3938 7586 3941 7560 3851 7565
TIME...MOT...LOC 1100Z 260DEG 20KT 3931 7561 3870 7583 

TORNADO...POSSIBLE
HAIL...1.00IN
WIND...70MPH
 
$$

CMS

847 
WWUS51 KPHI 061106 RRA
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
706 AM EDT Thu Aug 6 2020

DEC001-003-005-MDC011-029-035-061116-
/O.EXP.KPHI.SV.W.0206.000000T0000Z-200806T1115Z/
Sussex DE-New Castle DE-Kent DE-Queen Anne's MD-Caroline MD-Kent MD-
706 AM EDT Thu Aug 6 2020

...THE SEVERE THUNDERSTORM WARNING FOR WEST CENTRAL SUSSEX...
SOUTHWESTERN NEW CASTLE...WESTERN KENT...NORTHEASTERN QUEEN ANNE'S...
CAROLINE AND NORTHEASTERN KENT COUNTIES WILL EXPIRE AT 715 AM EDT...
    
The storms which prompted the warning is moving out of the area.
Therefore, the warning will be allowed to expire.  However, gusty 
winds and heavy rain are still possible with these thunderstorms.

LAT...LON 3852 7570 3865 7571 3871 7584 3868 7593
      3898 7584 3938 7586 3941 7560 3851 7565
TIME...MOT...LOC 1106Z 260DEG 20KT 3931 7558 3870 7580 

$$

CMS

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 6, 3:37 AM EDT	Flash Flood Watch	PHI	Kent, New Castle, Sussex	44 hr
Aug 6, 6:43 AM EDT	Areal Flood Advisory	PHI	Kent, New Castle	3 hr
Aug 6, 6:49 AM EDT	Severe Thunderstorm Warning	PHI	Kent, New Castle	41 min
Aug 6, 7:13 AM EDT	Flash Flood Warning	PHI	Kent, New Castle	3 hr
Aug 6, 7:13 AM EDT	Severe Thunderstorm Warning	PHI	Kent, Sussex	47 min
Aug 6, 7:18 AM EDT	Severe Thunderstorm Warning	PHI	Kent, New Castle	42 min
Aug 6, 7:46 AM EDT	Special Weather Statement	PHI	Sussex	29 min
Aug 6, 8:16 AM EDT	Severe Thunderstorm Warning	PHI	Sussex	44 min
Aug 6, 5:36 AM EDT	Severe Thunderstorm Warning	PHI	Caroline, Kent, Queen Anne's, Talbot	39 min
Aug 6, 6:19 AM EDT	Areal Flood Advisory	PHI	Kent, Queen Anne's	116 min
Aug 6, 8:43 AM EDT	Areal Flood Advisory	PHI	Cecil, Kent, Queen Anne's	87 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.