Alert archive / Maryland / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 112, NWS Philadelphia/Mount Holly

July 1, 20214 counties in Maryland; Kent County, New Castle County, Sussex County, Delaware

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Jul 1, 2021, 4:32 PM EDT for 4 counties in Maryland; Kent County, New Castle County, Sussex County, Delaware. It was in force for 43 min. 22 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, 4:32 PM EDT (20:32 UTC)
Expired: Jul 1, 2021, 5:15 PM EDT
In force: 43 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon
Hail: 1.0 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), 19 km from the middle of the area, began a volume at 20:35 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.

What was reported inside it

Time	Report	Where	Remark
Jul 1, 4:35 PM EDT	TSTM WND DMG	2 N Smithville, MD	TREES AND UTILITY LINES DOWN WITH DEBRIS ON THE ROADWAY ALONG MARYLAND ROUTE 404 AND BREEDING ROAD.
Jul 1, 4:35 PM EDT	TSTM WND DMG	2 Sw Starkey Corner, MD	TREES AND UTILITY WIRES DOWN WITH DEBRIS ON THE ROADWAY ALONG MARYLAND ROUTE 213 NEAR HATCHETT ROAD.
Jul 1, 4:35 PM EDT	TSTM WND DMG	2 Sw Starkey Corner, MD	TREES AND UTILITY WIRES DOWN WITH DEBRIS ON THE ROADWAY ALONG MARYLAND ROUTE 213 NEAR HATCHETT ROAD.
Jul 1, 4:35 PM EDT	TSTM WND DMG	Denton, MD	DOWNED WIRES IN THE DENTON AREA. 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.
Jul 1, 4:42 PM EDT	TSTM WND DMG	4 Wsw Seaford, DE	DOWNED TREES AND POWER LINES NEAR WOODPECKER ROAD. TIME ESTIMATED FROM RADAR.
Jul 1, 4:50 PM EDT	TSTM WND DMG	2 Sw Seaford, DE	DOWNED TREE LIMBS AND WIRES NEAR CRAIGS MILL ROAD AND WOODLAND ROAD. TIME ESTIMATED FROM RADAR.
Jul 1, 4:52 PM EDT	TSTM WND DMG	2 Nne Farmington, DE	TREES DOWN AND VEHICLES BLOWN OFF THE ROAD ALONG U.S ROUTE 13 AROUND TOWER HILL ROAD.
Jul 1, 4:52 PM EDT	TSTM WND DMG	Harrington, DE	TREES AND UTILITY LINES DOWN WITH DEBRIS IN THE ROADWAY.
Jul 1, 4:52 PM EDT	TORNADO	1 N Farmington, DE	WIND DAMAGE WAS FIRST OBSERVED NEAR A RESIDENCE ON FARMINGTON ROAD, KNOCKING DOWN AND SNAPPING SEVERAL TREES IN A NARROW SWATH. THE TORNADO THEN CONTINUED OVER RAILROAD TRACKS AND A CORNFIELD, WHERE A NOTABLE CONVERGENT PATTERN WAS OBSERVED. FROM THERE, THE TO
Jul 1, 4:53 PM EDT	TSTM WND DMG	3 Ne Bridgeville, DE	SEVERAL REPORTS OF DOWNED TREES AND WIRES NORTHEAST OF BRIDGEVILLE. TIME ESTIMATED FROM RADAR.
Jul 1, 4:53 PM EDT	TSTM WND DMG	Seaford, DE	DOWNED WIRES ON HALL STREET, ALDER LANE, AND NEAR THE INTERSECTION OF NEALS SCHOOL ROAD AND BOYCE ROAD IN SEAFORD. TIME ESTIMATED FROM RADAR.
Jul 1, 4:58 PM EDT	TSTM WND DMG	2 Sw Houston, DE	DOWNED TREES AND WIRES NEAR THISTLEWOOD ROAD. TIME ESTIMATED FROM RADAR.
Jul 1, 5:00 PM EDT	TSTM WND DMG	2 Wsw Houston, DE	ROOF DAMAGE TO A MOBILE HOME ON HUNTING QUARTER ROAD NEAR WILLIAMSVILLE, DE. TIME ESTIMATED FROM RADAR. SOCIAL MEDIA REPORT.
Jul 1, 5:00 PM EDT	TORNADO	2 Ene Milford, DE	UPDATES PREVIOUS TORNADO REPORT FROM 3 ENE MILFORD TO REFLECT STORM SURVEY RESULTS. DAMAGE WAS FIRST OBSERVED NEAR RESIDENCES AT THE CEDAR BEACH ROAD AND MCCOLLEY ROAD INTERSECTION. HERE, SEVERAL LARGE BRANCHES AND TREES WERE SNAPPED. FURTHER EAST ALONG CEDAR
Jul 1, 5:02 PM EDT	TORNADO	3 Ene Milford, DE	SIGNIFICANT TREE DAMAGE WITH SOME TREES INTO HOUSES.
Jul 1, 5:03 PM EDT	TSTM WND DMG	2 E Milford, DE	SEVERAL LARGE TREES DOWNED. TIME ESTIMATED FROM RADAR.
Jul 1, 5:05 PM EDT	TSTM WND GST 46	1 E Milford, DE
Jul 1, 5:16 PM EDT	TSTM WND GST 56	Lewes, DE	WEATHERFLOW.
Jul 1, 5:18 PM EDT	TSTM WND GST 64	1 Ene Lewes, DE	NOS GAUGE LWSD1.
Jul 1, 5:19 PM EDT	TSTM WND DMG	Stockley, DE	DOWNED POWER POLES AND WIRES NEAR MORRIS MILL ROAD. TIME ESTIMATED FROM RADAR.
Jul 1, 5:24 PM EDT	TSTM WND GST 61	1 Ene Lewes, DE	NOS GAUGE LWSD1.

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, 8.5 hours before the alert went out and 102 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.

945 
WUUS51 KPHI 012032
SVRPHI
DEC001-003-005-MDC011-029-035-041-012115-
/O.NEW.KPHI.SV.W.0112.210701T2032Z-210701T2115Z/

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

The National Weather Service in Mount Holly NJ has issued a

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

* Until 515 PM EDT.

* At 431 PM EDT, severe thunderstorms were located along a line
  extending from near Old Town to Greensboro to Federalsburg to near
  Sharptown, moving east at 45 mph.

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

  SOURCE...Radar indicated.

  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...
  Dover, Georgetown, Centerville, Smyrna, Milford, Seaford,
  Chestertown, Denton, Centreville, Millsboro, Laurel, Harrington,
  Camden, Clayton, Lewes, Federalsburg, Milton, Selbyville,
  Bridgeville and Greensboro.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3846 7569 3865 7571 3871 7584 3869 7591
      3915 7614 3930 7607 3944 7555 3891 7512
      3845 7492
TIME...MOT...LOC 2031Z 262DEG 40KT 3916 7607 3895 7582 3868 7576 3849
7571

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

Robertson

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, 4:08 PM EDT	Severe Thunderstorm Warning	PHI	Caroline, Queen Anne's	52 min
Jul 1, 4:10 PM EDT	Areal Flood Advisory	PHI	Caroline, Kent, Queen Anne's, Talbot	94 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.