Alert archive / Maryland / Severe Thunderstorm Warnings in 2020

Severe Thunderstorm Warning 259, NWS Philadelphia/Mount Holly

August 25, 2020Caroline County, Queen Anne's County, Talbot County, Maryland

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Aug 25, 2020, 8:28 PM EDT for Caroline County, Queen Anne's County, Talbot County, Maryland. It was in force for 47 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Aug 25, 2020, 8:28 PM EDT (00:28 UTC)
Expired: Aug 25, 2020, 9:15 PM EDT
In force: 47 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

Counties Caroline County, MD, Queen Anne's County, MD, Talbot County, MD

The radar

The Dover AFB radar (KDOX), 70 km from the middle of the area, began a volume at 00:29 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.

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Aug 25, 3:34 PM EDT	Severe Thunderstorm Watch	SPC	7 hr

The nearest sounding before it

Washington/Dulle, VA (KIAD), launched 00:00Z, 0.5 hours before the alert went out and 103 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: 175 J/kg
Mixed-layer CIN: -152 J/kg
Mixed-layer LCL: 1480 m above ground
0-6 km bulk shear: 41 kt
0-1 km storm-relative helicity: 111 m²/s²
0-3 km storm-relative helicity: 118 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.1

Open this sounding in Storm Lab

The text

As transmitted.

723 
WUUS51 KPHI 260028
SVRPHI
MDC011-035-041-260115-
/O.NEW.KPHI.SV.W.0259.200826T0028Z-200826T0115Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mount Holly NJ
828 PM EDT Tue Aug 25 2020

The National Weather Service in Mount Holly NJ has issued a

* Severe Thunderstorm Warning for...
  Central Talbot County in eastern Maryland...
  Southwestern Queen Anne's County in northeastern Maryland...
  Southwestern Caroline County in eastern Maryland...

* Until 915 PM EDT.

* At 828 PM EDT, a severe thunderstorm was located near Tilghman
  Island, or near Deale, moving southeast 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...
  Easton, Talbot, Trappe, St. Michaels, Preston, Oxford, Choptank,
  Tanyard, Tilghman Island, Hambleton and Windyhill.

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 3876 7633 3882 7631 3886 7635 3884 7637
      3889 7636 3879 7622 3883 7619 3870 7584
      3868 7593 3857 7602 3868 7617 3868 7621
      3876 7622 3871 7628 3878 7629 3876 7632
      3867 7634 3874 7634 3876 7638
TIME...MOT...LOC 0028Z 306DEG 30KT 3876 7643 

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

JEO

2 follow-up statements

648 
WWUS51 KPHI 260050
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
850 PM EDT Tue Aug 25 2020

MDC035-260059-
/O.CAN.KPHI.SV.W.0259.000000T0000Z-200826T0115Z/
Queen Anne's MD-
850 PM EDT Tue Aug 25 2020

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHWESTERN QUEEN ANNE'S
COUNTY IS CANCELLED...
    
The severe thunderstorm which prompted the warning has moved out of 
the warned area. Therefore, the warning has been cancelled.

A Severe Thunderstorm Watch remains in effect until 1100 PM EDT for
eastern Maryland.

LAT...LON 3876 7633 3881 7631 3882 7626 3879 7622
      3883 7619 3883 7618 3870 7584 3868 7593
      3857 7602 3868 7617 3868 7621 3876 7622
      3871 7628 3878 7629 3876 7632 3867 7634
      3874 7634
TIME...MOT...LOC 0049Z 306DEG 30KT 3865 7625 

$$

MDC011-041-260115-
/O.CON.KPHI.SV.W.0259.000000T0000Z-200826T0115Z/
Talbot MD-Caroline MD-
850 PM EDT Tue Aug 25 2020

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 915 PM EDT
FOR CENTRAL TALBOT AND SOUTHWESTERN CAROLINE COUNTIES...

At 849 PM EDT, a severe thunderstorm was located near Oxford, or 11
miles northwest of Cambridge, moving southeast at 35 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...
Easton, Trappe, St. Michaels, Preston, Oxford, Choptank, Tanyard,
Tilghman Island, Hambleton, Windyhill and Copperville.

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 3876 7633 3881 7631 3882 7626 3879 7622
      3883 7619 3883 7618 3870 7584 3868 7593
      3857 7602 3868 7617 3868 7621 3876 7622
      3871 7628 3878 7629 3876 7632 3867 7634
      3874 7634
TIME...MOT...LOC 0049Z 306DEG 30KT 3865 7625 

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

JEO

686 
WWUS51 KPHI 260114
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
914 PM EDT Tue Aug 25 2020

MDC011-041-260124-
/O.EXP.KPHI.SV.W.0259.000000T0000Z-200826T0115Z/
Talbot MD-Caroline MD-
914 PM EDT Tue Aug 25 2020

...THE SEVERE THUNDERSTORM WARNING FOR CENTRAL TALBOT AND
SOUTHWESTERN CAROLINE COUNTIES WILL EXPIRE AT 915 PM EDT...
        
The storm which prompted the warning has moved out of the area.
Therefore, the warning will be allowed to expire.

A Severe Thunderstorm Watch remains in effect until 1100 PM EDT for
eastern Maryland.

LAT...LON 3876 7633 3881 7631 3882 7626 3879 7622
      3883 7619 3883 7618 3870 7584 3868 7593
      3857 7602 3868 7617 3868 7621 3876 7622
      3871 7628 3878 7629 3876 7632 3867 7634
      3874 7634
TIME...MOT...LOC 0114Z 306DEG 30KT 3854 7605 

$$

JEO

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 25, 8:23 PM EDT	Special Weather Statement	PHI	Caroline	37 min
Aug 25, 9:00 PM EDT	Special Weather Statement	PHI	Caroline	45 min
Aug 25, 9:12 PM EDT	Severe Thunderstorm Warning	PHI	Caroline, Talbot	48 min

Nearby

Severe Thunderstorm Warnings in Maryland, 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.