Alert archive / Maryland / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 221, NWS Philadelphia/Mount Holly

July 21, 2021Caroline County, Queen Anne's County, Talbot County, Maryland

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Jul 21, 2021, 4:25 PM EDT for Caroline County, Queen Anne's County, Talbot County, Maryland. It was in force for 30 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: Jul 21, 2021, 4:25 PM EDT (20:25 UTC)
Expired: Jul 21, 2021, 4:55 PM EDT
In force: 30 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

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

The radar

The Dover AFB radar (KDOX), 55 km from the middle of the area, began a volume at 20:29 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
Jul 21, 11:56 AM EDT	Severe Thunderstorm Watch	SPC	7 hr

The nearest sounding before it

Wallops Is Stn, VA (KWAL), launched 12:00Z, 8.4 hours before the alert went out and 107 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: 728 J/kg
Mixed-layer CIN: -47 J/kg
Mixed-layer LCL: 1221 m above ground
0-6 km bulk shear: 21 kt
0-1 km storm-relative helicity: 17 m²/s²
0-3 km storm-relative helicity: -10 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.4

Open this sounding in Storm Lab

The text

As transmitted.

060 
WUUS51 KPHI 212025
SVRPHI
MDC011-035-041-212115-
/O.NEW.KPHI.SV.W.0221.210721T2025Z-210721T2115Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mount Holly NJ
425 PM EDT Wed Jul 21 2021

The National Weather Service in Mount Holly NJ has issued a

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

* Until 515 PM EDT.

* At 425 PM EDT, a severe thunderstorm was located near Skipton, or 8
  miles northwest of Easton, moving southeast at 25 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, Federalsburg, Trappe, Preston, Tanyard, Harmony, Skipton,
  Copperville, Matthews, Choptank, Wye Mills, Hambleton, Windyhill
  and Cordova.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

To report severe weather, contact your nearest law enforcement
agency. They will send your report to the National Weather Service
office in Mount Holly NJ.

In addition to large 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 3859 7606 3860 7606 3863 7610 3879 7621
      3879 7619 3881 7623 3881 7621 3889 7620
      3891 7624 3891 7621 3893 7620 3900 7609
      3867 7575 3868 7580 3871 7584 3870 7590
      3866 7596 3860 7599 3857 7603
TIME...MOT...LOC 2025Z 325DEG 23KT 3889 7614 

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

MPS

2 follow-up statements

624 
WWUS51 KPHI 212040
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
440 PM EDT Wed Jul 21 2021

MDC035-212050-
/O.CAN.KPHI.SV.W.0221.000000T0000Z-210721T2115Z/
Queen Anne's MD-
440 PM EDT Wed Jul 21 2021

...THE SEVERE THUNDERSTORM WARNING FOR SOUTH CENTRAL 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 800 PM EDT for
eastern Maryland.

LAT...LON 3881 7620 3892 7602 3873 7581 3867 7575
      3868 7580 3871 7584 3870 7590 3866 7596
      3860 7599 3857 7603 3858 7604
TIME...MOT...LOC 2040Z 325DEG 23KT 3881 7607 

$$

MDC011-041-212115-
/O.CON.KPHI.SV.W.0221.000000T0000Z-210721T2115Z/
Talbot MD-Caroline MD-
440 PM EDT Wed Jul 21 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 515 PM EDT
FOR TALBOT AND SOUTHWESTERN CAROLINE COUNTIES...

At 440 PM EDT, a severe thunderstorm was located over Easton, moving
southeast at 25 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, Federalsburg, Trappe, Preston, Tanyard, Harmony, Skipton,
Copperville, Matthews, Choptank, Hambleton, Windyhill and Cordova.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

To report severe weather contact your nearest law enforcement agency.
They will send your report to the National Weather Service office in
Mount Holly NJ.

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

&&

LAT...LON 3881 7620 3892 7602 3873 7581 3867 7575
      3868 7580 3871 7584 3870 7590 3866 7596
      3860 7599 3857 7603 3858 7604
TIME...MOT...LOC 2040Z 325DEG 23KT 3881 7607 

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

MPS

273 
WWUS51 KPHI 212055
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
455 PM EDT Wed Jul 21 2021

MDC011-041-212105-
/O.CAN.KPHI.SV.W.0221.000000T0000Z-210721T2115Z/
Talbot MD-Caroline MD-
455 PM EDT Wed Jul 21 2021

...THE SEVERE THUNDERSTORM WARNING FOR TALBOT AND SOUTHWESTERN
CAROLINE COUNTIES IS CANCELLED...
                
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 has been cancelled.

A Severe Thunderstorm Watch remains in effect until 800 PM EDT for
eastern Maryland.

To report severe weather, contact your nearest law enforcement
agency. They will relay your report to the National Weather Service
Mount Holly NJ.

LAT...LON 3881 7620 3892 7602 3873 7581 3867 7575
      3868 7580 3871 7584 3870 7590 3866 7596
      3860 7599 3857 7603 3858 7604
TIME...MOT...LOC 2053Z 325DEG 23KT 3873 7600 

$$

MPS

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 21, 3:48 PM EDT	Severe Thunderstorm Warning	PHI	Caroline, Queen Anne's, Talbot	26 min
Jul 21, 4:16 PM EDT	Severe Thunderstorm Warning	PHI	Caroline, Queen Anne's	44 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.