Alert archive / Maryland / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 110, NWS Philadelphia/Mount Holly

July 1, 2021Caroline County, Queen Anne's County, Maryland; Kent County, Delaware

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Jul 1, 2021, 4:08 PM EDT for Caroline County, Queen Anne's County, Maryland; Kent County, Delaware. It was in force for 52 min. 3 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: Jul 1, 2021, 4:08 PM EDT (20:08 UTC)
Expired: Jul 1, 2021, 5:00 PM EDT
In force: 52 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

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

The radar

The Dover AFB radar (KDOX), 49 km from the middle of the area, began a volume at 20:08 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
Jul 1, 4:19 PM EDT	TSTM WND DMG	2 Sse Templeville, MD	SEVERAL REPORTS OF DOWNED TREE LIMBS AND WIRES BETWEEN MARYDEL AND HARTLY. TIME ESTIMATED FROM RADAR.
Jul 1, 4:26 PM EDT	TSTM WND DMG	1 E Hartly, DE	DOWNED TREE LIMBS AND WIRES EAST OF HARTLY. TIME ESTIMATED FROM RADAR.
Jul 1, 4:42 PM EDT	TSTM WND DMG	2 Ssw Woodside, DE	SEVERAL REPORTS OF DOWNED TREE LIMBS AND WIRES NORTH OF FELTON. 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
Jul 1, 12:46 PM EDT	Severe Thunderstorm Watch	SPC	7 hr

The nearest sounding before it

Wallops Is Stn, VA (KWAL), launched 12:00Z, 8.1 hours before the alert went out and 147 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: 1445 J/kg
Mixed-layer CIN: -95 J/kg
Mixed-layer LCL: 981 m above ground
0-6 km bulk shear: 20 kt
0-1 km storm-relative helicity: 29 m²/s²
0-3 km storm-relative helicity: 31 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

576 
WUUS51 KPHI 012008 RRA
SVRPHI
DEC001-MDC011-035-012100-
/O.NEW.KPHI.SV.W.0110.210701T2008Z-210701T2100Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mount Holly NJ
408 PM EDT Thu Jul 1 2021

The National Weather Service in Mount Holly NJ has issued a

* Severe Thunderstorm Warning for...
  Kent County in central Delaware...
  Northeastern Queen Anne's County in northeastern Maryland...
  Northeastern Caroline County in eastern Maryland...

* Until 500 PM EDT.

* At 408 PM EDT, a severe thunderstorm was located near Goldsboro, or
  11 miles east of Centerville, moving east at 35 mph.

  HAZARD...60 mph wind gusts and penny size hail.

  SOURCE...Radar indicated.

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

* Locations impacted include...
  Dover, Smyrna, Camden, Clayton, Cheswold, Sudlersville, Bowers,
  Goldsboro, Woodside, Viola, Hartly, Rising Sun-Lebanon, Woodland
  Beach, Hazlettville, Dover Base Housing, Dover Speedway, Sandtown,
  Rising Sun, Wyoming and Kenton.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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 this storm. Move indoors
immediately. Remember, if you can hear thunder, you are close enough
to be struck by lightning.

&&

LAT...LON 3925 7577 3925 7576 3926 7575 3929 7565
      3931 7561 3931 7558 3933 7557 3937 7547
      3926 7537 3905 7533 3899 7592 3917 7597
TIME...MOT...LOC 2008Z 256DEG 30KT 3910 7585 

HAIL...0.75IN
WIND...60MPH
 
$$

CMS

1 follow-up statement

293 
WWUS51 KPHI 012043
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
443 PM EDT Thu Jul 1 2021

DEC001-MDC011-035-012100-
/O.CON.KPHI.SV.W.0110.000000T0000Z-210701T2100Z/
Kent DE-Queen Anne's MD-Caroline MD-
443 PM EDT Thu Jul 1 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 500 PM EDT
FOR KENT...NORTHEASTERN QUEEN ANNE'S AND NORTHEASTERN CAROLINE
COUNTIES...

At 442 PM EDT, a severe thunderstorm was located over Dover, moving
east at 35 mph.

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

SOURCE...Radar indicated. The public reported dime sized hail in 
         Dover. Several reports of wind damage have been received 
         from Queen Anne's County.

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

Locations impacted include...
Dover, Smyrna, Camden, Clayton, Cheswold, Sudlersville, Bowers,
Goldsboro, Woodside, Viola, Hartly, Rising Sun-Lebanon, Woodland
Beach, Hazlettville, Dover Base Housing, Dover Speedway, Sandtown,
Rising Sun, Wyoming and Kenton.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Frequent cloud to ground lightning is occurring with this storm. 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 3925 7577 3925 7576 3926 7575 3929 7565
      3931 7561 3931 7558 3933 7557 3937 7547
      3926 7537 3905 7533 3899 7592 3917 7597
TIME...MOT...LOC 2042Z 256DEG 30KT 3917 7549 

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

CMS

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 1, 3:12 PM EDT	Severe Thunderstorm Warning	PHI	Kent, Queen Anne's, Talbot	48 min
Jul 1, 3:56 PM EDT	Severe Thunderstorm Warning	PHI	Caroline, Kent, Queen Anne's, Talbot	49 min
Jul 1, 4:08 PM EDT	Severe Thunderstorm Warning	PHI	Caroline, Queen Anne's, Talbot	52 min
Jul 1, 4:10 PM EDT	Areal Flood Advisory	PHI	Caroline, Kent, Queen Anne's, Talbot	94 min
Jul 1, 4:32 PM EDT	Severe Thunderstorm Warning	PHI	Caroline, Kent, Queen Anne's, Talbot	43 min
Jun 30, 9:21 PM EDT	Special Weather Statement	PHI	New Castle	39 min
Jul 1, 3:48 PM EDT	Areal Flood Advisory	PHI	New Castle	112 min
Jul 1, 3:50 PM EDT	Severe Thunderstorm Warning	PHI	New Castle	40 min
Jul 1, 4:27 PM EDT	Severe Thunderstorm Warning	PHI	New Castle	48 min
Jul 1, 4:57 PM EDT	Tornado Warning	PHI	Kent, Sussex	22 min
Jul 1, 5:12 PM EDT	Severe Thunderstorm Warning	PHI	Kent, Sussex	48 min

Nearby

Severe Thunderstorm Warnings in Maryland, 2021 Severe Thunderstorm Warnings in Delaware, 2021 Every severe thunderstorm warning 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.