Alert archive / Maryland / Severe Thunderstorm Warnings in 2020

Severe Thunderstorm Warning 81, NWS Philadelphia/Mount Holly

June 27, 2020Caroline County, Kent County, Queen Anne's County, Maryland; Kent County, Delaware

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Jun 27, 2020, 5:40 PM EDT for Caroline County, Kent County, Queen Anne's County, Maryland; Kent County, Delaware. It was in force for 35 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: Jun 27, 2020, 5:40 PM EDT (21:40 UTC)
Expired: Jun 27, 2020, 6:15 PM EDT
In force: 35 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

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

The radar

The Dover AFB radar (KDOX), 63 km from the middle of the area, began a volume at 21:43 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
Jun 27, 5:43 PM EDT	TSTM WND DMG	Chestertown, MD	DEBRIS ON MD 446 SOUTH AT WHISPERING PINES LANE. TIME ESTIMATED FROM RADAR. THIS CORRECTS THE TIME OF THE EVENT CONTAINED IN THE PREVIOUS REPORT.
Jun 27, 5:48 PM EDT	TSTM WND DMG	Langford, MD	SEVERAL REPORTS OF TREES AND POWER LINES DOWN ALONG BROAD NECK ROAD AND NEAR ISLAND POINT. TIME BASED ON UTILITY COMPANY REPORTS.

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

The nearest sounding before it

Washington/Dulle, VA (KIAD), launched 12:00Z, 9.7 hours before the alert went out and 129 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: 2 J/kg
Mixed-layer CIN: -198 J/kg
Mixed-layer LCL: 1545 m above ground
0-6 km bulk shear: 47 kt
0-1 km storm-relative helicity: 173 m²/s²
0-3 km storm-relative helicity: 160 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

621 
WUUS51 KPHI 272140
SVRPHI
DEC001-MDC011-029-035-272215-
/O.NEW.KPHI.SV.W.0081.200627T2140Z-200627T2215Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mount Holly NJ
540 PM EDT Sat Jun 27 2020

The National Weather Service in Mount Holly NJ has issued a

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

* Until 615 PM EDT.

* At 540 PM EDT, severe thunderstorms were located along a line
  extending from near Morgnec to Langford, moving east at 40 mph.

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

  SOURCE...Radar indicated.

  IMPACT...Minor damage to vehicles is possible. Wind damage to 
           roofs, siding, trees, and power lines is possible.

* Locations impacted include...
  Smyrna, Chestertown, Clayton, Church Hill, Millington,
  Sudlersville, Hartly, Langford, Morgnec, Crumpton, Kenton, Marydel,
  Templeville, Barclay and Kingstown.

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 3930 7598 3929 7552 3910 7576 3918 7622
      3923 7623
TIME...MOT...LOC 2140Z 270DEG 34KT 3928 7596 3918 7615 

HAIL...1.00IN
WIND...60MPH
 
$$

JEO

2 follow-up statements

135 
WWUS51 KPHI 272156
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
556 PM EDT Sat Jun 27 2020

DEC001-MDC011-029-035-272215-
/O.CON.KPHI.SV.W.0081.000000T0000Z-200627T2215Z/
Kent DE-Queen Anne's MD-Caroline MD-Kent MD-
556 PM EDT Sat Jun 27 2020

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 615 PM EDT
FOR NORTHWESTERN KENT...NORTHEASTERN QUEEN ANNE'S...NORTHERN CAROLINE
AND EAST CENTRAL KENT COUNTIES...

At 556 PM EDT, severe thunderstorms were located along a line
extending from Delaney Corner to near Church Hill, moving east at 40
mph.

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

SOURCE...Radar indicated.

IMPACT...Minor damage to vehicles is possible. Wind damage to roofs, 
         siding, trees, and power lines is possible.

Locations impacted include...
Smyrna, Clayton, Church Hill, Millington, Sudlersville, Hartly,
Morgnec, Crumpton, Kenton, Marydel, Templeville, Barclay and
Kingstown.

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 3930 7598 3929 7552 3910 7576 3915 7606
      3922 7603
TIME...MOT...LOC 2156Z 270DEG 34KT 3928 7577 3918 7596 

HAIL...1.00IN
WIND...60MPH
 
$$

JEO

952 
WWUS51 KPHI 272208
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
608 PM EDT Sat Jun 27 2020

DEC001-MDC011-029-035-272218-
/O.EXP.KPHI.SV.W.0081.000000T0000Z-200627T2215Z/
Kent DE-Queen Anne's MD-Caroline MD-Kent MD-
608 PM EDT Sat Jun 27 2020

...THE SEVERE THUNDERSTORM WARNING FOR NORTHWESTERN KENT...
NORTHEASTERN QUEEN ANNE'S...NORTHERN CAROLINE AND EAST CENTRAL KENT
COUNTIES WILL EXPIRE AT 615 PM EDT...
            
The storms which prompted the warning have weakened below severe
limits, and no longer pose an immediate threat to life or property.
Therefore, the warning will be allowed to expire.

LAT...LON 3930 7598 3929 7552 3910 7576 3915 7606
      3922 7603
TIME...MOT...LOC 2208Z 270DEG 34KT 3928 7567 3918 7586 

$$

JEO

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 27, 4:56 PM EDT	Special Weather Statement	PHI	Cecil	34 min
Jun 27, 4:59 PM EDT	Severe Thunderstorm Warning	PHI	Cecil, Kent	31 min
Jun 27, 5:32 PM EDT	Special Weather Statement	PHI	Kent	28 min
Jun 27, 5:37 PM EDT	Severe Thunderstorm Warning	PHI	Kent, Queen Anne's, Talbot	23 min
Jun 27, 5:25 PM EDT	Special Weather Statement	PHI	New Castle	35 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.