Alert archive / Maryland / Tornado Warnings in 2020

Tornado Warning 11, NWS Philadelphia/Mount Holly

August 4, 2020Kent County, Queen Anne's County, Maryland

NWS Philadelphia/Mount Holly issued this tornado warning at Aug 4, 2020, 7:22 AM EDT for Kent County, Queen Anne's County, Maryland. It was in force for 23 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 4, 2020, 7:22 AM EDT (11:22 UTC)
Expired: Aug 4, 2020, 7:45 AM EDT
In force: 23 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon
Tornado: Radar indicated
Hail: 0.0 in

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

The radar

The Dover AFB radar (KDOX), 71 km from the middle of the area, began a volume at 11:22 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 4, 2:26 AM EDT	Tornado Watch	SPC	9 hr

The nearest sounding before it

Washington/Dulle, VA (KIAD), launched 00:00Z, 11.4 hours before the alert went out and 101 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: 89 J/kg
Mixed-layer CIN: -54 J/kg
Mixed-layer LCL: 889 m above ground
0-6 km bulk shear: 43 kt
0-1 km storm-relative helicity: 65 m²/s²
0-3 km storm-relative helicity: 140 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.1

Open this sounding in Storm Lab

The text

As transmitted.

572 
WFUS51 KPHI 041122
TORPHI
MDC029-035-041145-
/O.NEW.KPHI.TO.W.0011.200804T1122Z-200804T1145Z/

BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service Mount Holly NJ
722 AM EDT Tue Aug 4 2020

The National Weather Service in Mount Holly NJ has issued a

* Tornado Warning for...
  Southwestern Queen Anne's County in northeastern Maryland...
  Southwestern Kent County in northeastern Maryland...

* Until 745 AM EDT.
    
* At 721 AM EDT, a severe thunderstorm capable of producing a tornado
  was located over Grasonville, or 10 miles southwest of Centerville,
  moving north at 20 mph.

  HAZARD...Tornado.

  SOURCE...Radar indicated rotation.

  IMPACT...Flying debris will be dangerous to those caught without 
           shelter. Mobile homes will be damaged or destroyed. 
           Damage to roofs, windows, and vehicles will occur.  Tree 
           damage is likely.

* Locations impacted include...
  Chester, Stevensville, Overton and Grasonville. 

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.

TAKE COVER NOW! Move to a basement or an interior room on the lowest
floor of a sturdy building. Avoid windows. If you are outdoors, in a
mobile home, or in a vehicle, move to the closest substantial shelter
and protect yourself from flying debris.

Torrential rainfall is occurring with this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.

&&

LAT...LON 3904 7630 3898 7628 3897 7622 3900 7617
      3902 7623 3908 7623 3909 7618 3890 7614
      3889 7620 3894 7621 3894 7624 3896 7625
      3890 7625 3900 7633
TIME...MOT...LOC 1121Z 161DEG 16KT 3895 7621 

TORNADO...RADAR INDICATED
HAIL...0.00IN

$$

SFJ

2 follow-up statements

995 
WWUS51 KPHI 041133
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
733 AM EDT Tue Aug 4 2020

MDC029-035-041145-
/O.CON.KPHI.TO.W.0011.000000T0000Z-200804T1145Z/
Queen Anne's MD-Kent MD-
733 AM EDT Tue Aug 4 2020

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 745 AM EDT FOR WEST
CENTRAL QUEEN ANNE'S AND SOUTHWESTERN KENT COUNTIES...
    
At 733 AM EDT, a severe thunderstorm capable of producing a tornado
was located over Overton, or 9 miles west of Centerville, moving
north at 20 mph.

HAZARD...Tornado.

SOURCE...Radar indicated rotation.

IMPACT...Flying debris will be dangerous to those caught without 
         shelter. Mobile homes will be damaged or destroyed. Damage 
         to roofs, windows, and vehicles will occur.  Tree damage is 
         likely.

Locations impacted include...
Grasonville, Overton and Queenstown. 

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.

TAKE COVER NOW! Move to a basement or an interior room on the lowest
floor of a sturdy building. Avoid windows. If you are outdoors, in a
mobile home, or in a vehicle, move to the closest substantial shelter
and protect yourself from flying debris.

Torrential rainfall is occurring with this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.

&&

LAT...LON 3898 7628 3897 7622 3900 7617 3902 7623
      3908 7623 3909 7618 3896 7615 3894 7621
      3894 7624 3896 7625
TIME...MOT...LOC 1133Z 161DEG 16KT 3900 7623 

TORNADO...RADAR INDICATED
HAIL...0.00IN

$$

SFJ

707 
WWUS51 KPHI 041140
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
740 AM EDT Tue Aug 4 2020

MDC029-035-041150-
/O.EXP.KPHI.TO.W.0011.000000T0000Z-200804T1145Z/
Queen Anne's MD-Kent MD-
740 AM EDT Tue Aug 4 2020

...THE TORNADO WARNING FOR WEST CENTRAL QUEEN ANNE'S AND SOUTHWESTERN
KENT COUNTIES WILL EXPIRE AT 745 AM EDT...
                
The storm which prompted the warning has weakened below severe
limits, and no longer appears capable of producing a tornado.
Therefore, the warning will be allowed to expire.

A Tornado Watch remains in effect until noon EDT for northeastern
Maryland.

LAT...LON 3898 7628 3897 7622 3900 7617 3902 7623
      3908 7623 3909 7618 3896 7615 3894 7621
      3894 7624 3896 7625
TIME...MOT...LOC 1140Z 161DEG 16KT 3903 7624 

$$

SFJ

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 4, 1:33 AM EDT	Areal Flood Advisory	PHI	Caroline, Kent, Queen Anne's, Talbot	4 hr
Aug 4, 2:10 AM EDT	Flash Flood Warning	PHI	Caroline, Kent, Queen Anne's, Talbot	4 hr
Aug 4, 5:17 AM EDT	Areal Flood Advisory	PHI	Cecil, Kent	4 hr
Aug 4, 6:55 AM EDT	Tornado Warning	PHI	Kent, Queen Anne's	35 min
Aug 4, 7:50 AM EDT	Flash Flood Warning	PHI	Caroline, Kent, Queen Anne's, Talbot	4 hr
Aug 4, 8:13 AM EDT	Tornado Warning	PHI	Kent, Queen Anne's, Talbot	26 min
Aug 4, 8:27 AM EDT	Tornado Warning	PHI	Caroline, Cecil, Kent, Queen Anne's	33 min
Aug 4, 8:50 AM EDT	Flash Flood Warning	PHI	Caroline, Cecil, Kent, Queen Anne's	4 hr
Aug 4, 8:56 AM EDT	Tornado Warning	PHI	Cecil	34 min
Aug 4, 9:23 AM EDT	Flash Flood Warning	PHI	Cecil	4 hr
Aug 4, 9:23 AM EDT	Tornado Warning Tornado observed	PHI	Cecil	22 min
Aug 4, 1:59 PM EDT	Areal Flood Warning	PHI	Cecil	9 hr

Nearby

Tornado Warnings in Maryland, 2020 Every tornado warning in 2020 Tornadoes 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.