Alert archive / Maryland / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 26, NWS Philadelphia/Mount Holly

May 4, 2021Caroline County, Talbot County, Maryland; Kent County, Sussex County, Delaware

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at May 4, 2021, 7:04 PM EDT for Caroline County, Talbot County, Maryland; Kent County, Sussex County, Delaware. It was in force for 41 min. 2 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: May 4, 2021, 7:04 PM EDT (23:04 UTC)
Expired: May 4, 2021, 7:45 PM EDT
In force: 41 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

Counties Kent County, DE, Sussex County, DE, Caroline County, MD, Talbot County, MD

The radar

The Dover AFB radar (KDOX), 36 km from the middle of the area, began a volume at 23:04 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
May 4, 7:25 PM EDT	TSTM WND DMG	2 Nw Seaford, DE	CORRECTS TIME OF PREVIOUS TSTM WND DMG REPORT FROM 2 NW SEAFORD. DELAYED REPORT. TREE LIMBS DOWN ON WIRES CAUSED A POWER OUTAGE NEAR ATLANTA RD. TIME ESTIMATED FROM RADAR.
May 4, 7:25 PM EDT	TSTM WND GST 53	5 W Seaford, DE	53 MPH MEASURED AT THE DEOS MESONET SITE NEAR SEAFORD.

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 12:00Z, 11.1 hours before the alert went out and 88 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: 60 J/kg
Mixed-layer CIN: -270 J/kg
Mixed-layer LCL: 1140 m above ground
0-6 km bulk shear: 40 kt
0-1 km storm-relative helicity: 46 m²/s²
0-3 km storm-relative helicity: 96 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

309 
WUUS51 KPHI 042304
SVRPHI
DEC001-005-MDC011-041-042345-
/O.NEW.KPHI.SV.W.0026.210504T2304Z-210504T2345Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mount Holly NJ
704 PM EDT Tue May 4 2021

The National Weather Service in Mount Holly NJ has issued a

* Severe Thunderstorm Warning for...
  Western Sussex County in southern Delaware...
  Southwestern Kent County in central Delaware...
  Southeastern Talbot County in eastern Maryland...
  Southern Caroline County in eastern Maryland...

* Until 745 PM EDT.

* At 703 PM EDT, a severe thunderstorm was located over Windyhill, or
  near Easton, moving northeast at 50 mph.

  HAZARD...60 mph wind gusts.

  SOURCE...Radar indicated.

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

* Locations impacted include...
  Easton, Seaford, Denton, Laurel, Harrington, Federalsburg,
  Bridgeville, Trappe, Preston, Tanyard, Harmony, Smithville, Agner,
  Matthews, Choptank, Hambleton, Windyhill, Andrewsville, Griffin and
  Blades.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3846 7569 3864 7571 3869 7577 3868 7580
      3870 7580 3871 7584 3870 7590 3868 7594
      3860 7599 3857 7603 3870 7617 3902 7566
      3883 7546 3846 7559
TIME...MOT...LOC 2303Z 234DEG 45KT 3871 7601 

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

JEO

2 follow-up statements

703 
WWUS51 KPHI 042319
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
719 PM EDT Tue May 4 2021

MDC041-042328-
/O.CAN.KPHI.SV.W.0026.000000T0000Z-210504T2345Z/
Talbot MD-
719 PM EDT Tue May 4 2021

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN TALBOT COUNTY IS
CANCELLED...
    
The severe thunderstorm which prompted the warning has moved out of 
the warned area. Therefore, the warning has been cancelled.

LAT...LON 3846 7569 3864 7571 3869 7577 3868 7580
      3870 7580 3871 7584 3872 7589 3894 7558
      3883 7546 3846 7559
TIME...MOT...LOC 2318Z 234DEG 45KT 3883 7581 

$$

DEC001-005-MDC011-042345-
/O.CON.KPHI.SV.W.0026.000000T0000Z-210504T2345Z/
Sussex DE-Kent DE-Caroline MD-
719 PM EDT Tue May 4 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 745 PM EDT
FOR WESTERN SUSSEX...SOUTH CENTRAL KENT AND SOUTHEASTERN CAROLINE
COUNTIES...

At 718 PM EDT, a severe thunderstorm was located near Denton, or 14
miles north of Hurlock, moving northeast at 50 mph.

HAZARD...60 mph wind gusts.

SOURCE...Radar indicated.

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

Locations impacted include...
Seaford, Laurel, Harrington, Federalsburg, Bridgeville, Agner,
Smithville, Andrewsville, Blades, Greenwood, Bethel and Farmington.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3846 7569 3864 7571 3869 7577 3868 7580
      3870 7580 3871 7584 3872 7589 3894 7558
      3883 7546 3846 7559
TIME...MOT...LOC 2318Z 234DEG 45KT 3883 7581 

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

JEO

752 
WWUS51 KPHI 042334
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
734 PM EDT Tue May 4 2021

MDC011-042344-
/O.CAN.KPHI.SV.W.0026.000000T0000Z-210504T2345Z/
Caroline MD-
734 PM EDT Tue May 4 2021

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN CAROLINE COUNTY
IS CANCELLED...
    
The severe thunderstorm which prompted the warning has moved out of 
the warned area. Therefore, the warning has been cancelled.

LAT...LON 3846 7569 3874 7570 3894 7558 3883 7546
      3846 7559
TIME...MOT...LOC 2334Z 234DEG 45KT 3895 7560 

$$

DEC001-005-042345-
/O.CON.KPHI.SV.W.0026.000000T0000Z-210504T2345Z/
Sussex DE-Kent DE-
734 PM EDT Tue May 4 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 745 PM EDT
FOR WESTERN SUSSEX AND SOUTH CENTRAL KENT COUNTIES...

At 734 PM EDT, a severe thunderstorm was located over Harrington, or
15 miles south of Dover, moving northeast at 50 mph.

HAZARD...60 mph wind gusts.

SOURCE...Radar indicated.

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

Locations impacted include...
Seaford, Laurel, Harrington, Bridgeville, Blades, Greenwood, Bethel
and Farmington.

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.

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

&&

LAT...LON 3846 7569 3874 7570 3894 7558 3883 7546
      3846 7559
TIME...MOT...LOC 2334Z 234DEG 45KT 3895 7560 

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

JEO

The office that day

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

Issued	Product	Office	Counties	Lasted
May 4, 5:54 PM EDT	Severe Thunderstorm Warning	PHI	Queen Anne's, Talbot	51 min
May 4, 6:50 PM EDT	Special Weather Statement	PHI	Talbot	40 min
May 4, 7:38 PM EDT	Severe Thunderstorm Warning	PHI	Kent, Sussex	31 min
May 4, 7:43 PM EDT	Special Weather Statement	PHI	Sussex	47 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.