Alert archive / Maryland / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 283, NWS Philadelphia/Mount Holly

August 30, 2021Kent County, Queen Anne's County, Maryland

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Aug 30, 2021, 4:54 PM EDT for Kent County, Queen Anne's County, Maryland. It was in force for 51 min. 3 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: Aug 30, 2021, 4:54 PM EDT (20:54 UTC)
Expired: Aug 30, 2021, 5:45 PM EDT
In force: 51 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

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

The radar

The Dover AFB radar (KDOX), 60 km from the middle of the area, began a volume at 20:55 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
Aug 30, 5:08 PM EDT	TSTM WND DMG	Chestertown, MD	SOME TREES DOWN IN CHESTERTOWN. TIME ESTIMATED FROM RADAR.
Aug 30, 5:10 PM EDT	TSTM WND DMG	Kingstown, MD	TREES DOWN IN THE KINGSTOWN AREA. TIME ESTIMATED FROM RADAR.
Aug 30, 5:10 PM EDT	TSTM WND DMG	Kingstown, MD	TREES DOWN IN THE KINGSTOWN AREA. TIME ESTIMATED FROM RADAR.

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, 8.9 hours before the alert went out and 130 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: 843 J/kg
Mixed-layer CIN: -70 J/kg
Mixed-layer LCL: 860 m above ground
0-6 km bulk shear: 20 kt
0-1 km storm-relative helicity: 65 m²/s²
0-3 km storm-relative helicity: 63 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

762 
WUUS51 KPHI 302054
SVRPHI
MDC029-035-302145-
/O.NEW.KPHI.SV.W.0283.210830T2054Z-210830T2145Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mount Holly NJ
454 PM EDT Mon Aug 30 2021

The National Weather Service in Mount Holly NJ has issued a

* Severe Thunderstorm Warning for...
  Northeastern Queen Anne's County in northeastern Maryland...
  Central Kent County in northeastern Maryland...

* Until 545 PM EDT.

* At 454 PM EDT, a severe thunderstorm was located over Morgnec, or
  12 miles north of Centerville, moving southeast at 5 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...
  Chestertown, Church Hill, Millington, Sudlersville, Morgnec,
  Crumpton, Langford, Templeville, Barclay and Kingstown.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

In addition to hail and damaging winds, frequent cloud to ground 
lightning is occurring with this storm. Move indoors immediately. 
Remember, if you can hear thunder, you are close enough to be struck 
by lightning.

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

&&

LAT...LON 3930 7613 3929 7576 3914 7575 3913 7579
      3912 7581 3917 7618
TIME...MOT...LOC 2054Z 300DEG 6KT 3921 7600 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...0.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

Gorse

2 follow-up statements

335 
WWUS51 KPHI 302116
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
516 PM EDT Mon Aug 30 2021

MDC029-035-302145-
/O.CON.KPHI.SV.W.0283.000000T0000Z-210830T2145Z/
Queen Anne's MD-Kent MD-
516 PM EDT Mon Aug 30 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 545 PM EDT
FOR NORTHEASTERN QUEEN ANNE'S AND CENTRAL KENT COUNTIES...

At 516 PM EDT, a severe thunderstorm was located near Church Hill, or
11 miles north of Centerville, and is nearly stationary.

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

SOURCE...Radar indicated.

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

Locations impacted include...
Chestertown, Church Hill, Millington, Sudlersville, Morgnec,
Crumpton, Langford, Templeville, Barclay and Kingstown.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Frequent cloud to ground lightning is occurring with this storm. Move
indoors immediately. Lightning is one of nature's leading killers.
Remember, if you can hear thunder, you are close enough to be struck
by lightning.

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

&&

LAT...LON 3930 7613 3929 7576 3914 7575 3913 7579
      3912 7581 3917 7618
TIME...MOT...LOC 2116Z 295DEG 4KT 3920 7601 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...0.88 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

Gorse

839 
WWUS51 KPHI 302136
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
536 PM EDT Mon Aug 30 2021

MDC029-035-302146-
/O.EXP.KPHI.SV.W.0283.000000T0000Z-210830T2145Z/
Queen Anne's MD-Kent MD-
536 PM EDT Mon Aug 30 2021

...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN QUEEN ANNE'S AND
CENTRAL KENT COUNTIES WILL EXPIRE AT 545 PM EDT...
                
The storm which prompted the warning has weakened below severe
limits, and no longer poses an immediate threat to life or property.
Therefore, the warning will be allowed to expire.  However gusty
winds and heavy rain are still possible with this thunderstorm.

LAT...LON 3930 7613 3929 7576 3914 7575 3913 7579
      3912 7581 3917 7618
TIME...MOT...LOC 2136Z 300DEG 6KT 3919 7598 

$$

Gorse

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 30, 5:00 AM EDT	Flash Flood Watch	PHI	Caroline, Kent, Queen Anne's, Talbot	71 hr
Aug 30, 3:46 PM EDT	Special Weather Statement	PHI	Kent	29 min
Aug 30, 4:27 PM EDT	Special Weather Statement	PHI	Kent	33 min

Nearby

Severe Thunderstorm Warnings in Maryland, 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.