Alert archive / Maryland / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 218, 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, 3:48 PM EDT for Caroline County, Queen Anne's County, Talbot County, Maryland. It was in force for 26 min. 1 report 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: Jul 21, 2021, 3:48 PM EDT (19:48 UTC)
Expired: Jul 21, 2021, 4:14 PM EDT
In force: 26 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), 43 km from the middle of the area, began a volume at 19:48 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
Jul 21, 3:55 PM EDT	TSTM WND DMG	1 Ese Queen Anne, MD	TREE DOWN ACROSS ALTERNATE MARYLAND ROUTE 404.

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

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, 7.8 hours before the alert went out and 117 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.

209 
WUUS51 KPHI 211948 RRA
SVRPHI
MDC011-035-041-212030-
/O.NEW.KPHI.SV.W.0218.210721T1948Z-210721T2030Z/

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

The National Weather Service in Mount Holly NJ has issued a

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

* Until 430 PM EDT.

* At 348 PM EDT, a severe thunderstorm was located over Queen Anne,
  or 10 miles southeast of Centerville, moving east 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...
  Denton, Greensboro, Oakland, Ridgely, Goldsboro, Queen Anne, Starr,
  Skipton, Jumptown, Matthews, Wye Mills, Griffin, Cordova, Hillsboro
  and Henderson.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Prepare immediately for large hail and damaging winds. People outside
should move immediately to shelter inside a strong building. Stay
away from windows.

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.

&&

LAT...LON 3879 7602 3896 7610 3909 7575 3885 7573
TIME...MOT...LOC 1948Z 249DEG 20KT 3891 7597 

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

MPS

2 follow-up statements

033 
WWUS51 KPHI 211959
SVSPHI

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

MDC011-035-041-212030-
/O.CON.KPHI.SV.W.0218.000000T0000Z-210721T2030Z/
Talbot MD-Queen Anne's MD-Caroline MD-
359 PM EDT Wed Jul 21 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 430 PM EDT
FOR NORTHEASTERN TALBOT...SOUTH CENTRAL QUEEN ANNE'S AND CENTRAL
CAROLINE COUNTIES...

At 359 PM EDT, a severe thunderstorm was located over Queen Anne, or
12 miles southeast of Centerville, moving east at 20 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...
Denton, Greensboro, Oakland, Ridgely, Queen Anne, Jumptown, Matthews,
Griffin, Cordova and Hillsboro.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Prepare immediately for large hail and damaging winds. People outside
should seek shelter inside a well-built structure and away from
windows.

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.

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.

&&

LAT...LON 3882 7601 3900 7599 3900 7574 3885 7573
      3881 7594
TIME...MOT...LOC 1959Z 276DEG 19KT 3890 7591 

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

MPS

484 
WWUS51 KPHI 212014
SVSPHI

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

MDC011-035-041-212024-
/O.CAN.KPHI.SV.W.0218.000000T0000Z-210721T2030Z/
Talbot MD-Queen Anne's MD-Caroline MD-
414 PM EDT Wed Jul 21 2021

...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN TALBOT...SOUTH
CENTRAL QUEEN ANNE'S AND CENTRAL 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.  However, gusty winds and 
heavy rain are still possible with this thunderstorm.

A Severe Thunderstorm Watch remains in effect until 800 PM EDT for
eastern and northeastern 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 3882 7601 3900 7599 3900 7574 3885 7573
      3881 7594
TIME...MOT...LOC 2012Z 249DEG 20KT 3893 7581 

$$

MPS

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 21, 4:16 PM EDT	Severe Thunderstorm Warning	PHI	Caroline, Queen Anne's	44 min
Jul 21, 4:25 PM EDT	Severe Thunderstorm Warning	PHI	Caroline, Queen Anne's, Talbot	30 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.