Alert archive / Maryland / Severe Thunderstorm Warnings in 2017

Severe Thunderstorm Warning 120, NWS Philadelphia/Mount Holly

July 23, 2017Caroline County, Queen Anne's County, Talbot County, Maryland

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Jul 23, 2017, 2:47 PM EDT for Caroline County, Queen Anne's County, Talbot County, Maryland. It was in force for 43 min. 2 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: Jul 23, 2017, 2:47 PM EDT (18:47 UTC)
Expired: Jul 23, 2017, 3:30 PM EDT
In force: 43 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), 62 km from the middle of the area, began a volume at 18:47 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 23, 2:53 PM EDT	TSTM WND GST 42	1 Wnw Sherwood, MD
Jul 23, 2:56 PM EDT	TSTM WND GST 42	1 Se Crescendo, MD

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, 6.8 hours before the alert went out and 108 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: 186 J/kg
Mixed-layer CIN: -43 J/kg
Mixed-layer LCL: 983 m above ground
0-6 km bulk shear: 21 kt
0-1 km storm-relative helicity: 19 m²/s²
0-3 km storm-relative helicity: 31 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.1

Open this sounding in Storm Lab

The text

As transmitted.

856 
WUUS51 KPHI 231847
SVRPHI
MDC011-035-041-231930-
/O.NEW.KPHI.SV.W.0120.170723T1847Z-170723T1930Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mount Holly NJ
247 PM EDT SUN JUL 23 2017

The National Weather Service in Mount Holly NJ has issued a

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

* Until 330 PM EDT

* At 247 PM EDT, severe thunderstorms were located along a line
  extending from near Londontowne to near Tilghman Island to 7 miles
  southeast of Breezy Point, moving east at 30 mph.

  HAZARD...60 mph wind gusts. 

  SOURCE...Radar indicated. 

  IMPACT...Expect damage to trees and power lines. 

* Locations impacted include...
  Easton, Centerville, Talbot, Denton, Centreville, Federalsburg,
  Greensboro, Oakland, Ridgely, Trappe, St. Michaels, Preston,
  Oxford, Queen Anne, Grasonville, Starr, Copperville, Jumptown,
  Agner and Choptank.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

In addition to 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 these storms, and may lead to 
poor drainage flooding. Do not drive your vehicle through flooded 
roadways.

&&

LAT...LON 3886 7626 3886 7625 3879 7620 3879 7619
      3894 7621 3894 7636 3897 7635 3903 7632
      3897 7622 3905 7620 3909 7599 3902 7585
      3892 7575 3866 7573 3870 7590 3857 7604
      3876 7630 3867 7634 3876 7638
TIME...MOT...LOC 1847Z 264DEG 25KT 3891 7659 3870 7638 3858 7639 

HAIL...<.75IN
WIND...60MPH
 
$$

JRK

3 follow-up statements

490 
WWUS51 KPHI 231907
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
307 PM EDT SUN JUL 23 2017

MDC011-035-041-231930-
/O.CON.KPHI.SV.W.0120.000000T0000Z-170723T1930Z/
Talbot MD-Queen Anne's MD-Caroline MD-
307 PM EDT SUN JUL 23 2017

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 330 PM EDT
FOR TALBOT...SOUTH CENTRAL QUEEN ANNE'S AND SOUTHERN CAROLINE
COUNTIES...

At 306 PM EDT, severe thunderstorms were located along a line
extending from Tilghman Island to near Oxford to 6 miles west of
University Of Maryland Center For Environmental Studies, moving east
at 30 mph.

HAZARD...60 mph wind gusts. 

SOURCE...Radar indicated. 

IMPACT...Expect damage to trees and power lines. 

Locations impacted include...
Easton, Talbot, Denton, Federalsburg, Trappe, St. Michaels, Preston,
Oxford, Tanyard, Harmony, Tilghman Island, Copperville, Agner,
Matthews, Choptank, Hambleton, Griffin, Windyhill and Cordova.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

In addition to 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 these storms, and may lead to 
poor drainage flooding. Do not drive your vehicle through flooded 
roadways.

&&

LAT...LON 3876 7633 3885 7627 3878 7621 3887 7619
      3894 7577 3892 7575 3866 7573 3871 7584
      3870 7590 3857 7604 3863 7608 3862 7611
      3872 7624 3876 7622 3873 7626 3878 7629
      3867 7634 3873 7633 3875 7637
TIME...MOT...LOC 1906Z 261DEG 22KT 3875 7632 3865 7622 3857 7624 

HAIL...<.75IN
WIND...60MPH
 
$$

JRK

104 
WWUS51 KPHI 231921
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
321 PM EDT SUN JUL 23 2017

MDC035-231930-
/O.CAN.KPHI.SV.W.0120.000000T0000Z-170723T1930Z/
Queen Anne's MD-
321 PM EDT SUN JUL 23 2017

...THE SEVERE THUNDERSTORM WARNING FOR SOUTH CENTRAL QUEEN ANNE'S
COUNTY IS CANCELLED...

The storms which prompted the warning will move south out of 
Queen Anne's County. Therefore, the warning has been cancelled.

LAT...LON 3883 7587 3874 7574 3866 7573 3871 7584
      3870 7590 3857 7604 3863 7608 3862 7611
      3872 7624 3873 7623
TIME...MOT...LOC 1920Z 263DEG 25KT 3869 7617 3866 7611 3854 7609 

$$

MDC011-041-231930-
/O.CON.KPHI.SV.W.0120.000000T0000Z-170723T1930Z/
Talbot MD-Caroline MD-
321 PM EDT SUN JUL 23 2017

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 330 PM EDT
FOR SOUTHEASTERN TALBOT AND SOUTHERN CAROLINE COUNTIES...

At 320 PM EDT, severe thunderstorms were located along a line
extending from Oxford to near Trappe to Cambridge, moving east at 30
mph.

HAZARD...60 mph wind gusts. 

SOURCE...Radar indicated. 

IMPACT...Expect damage to trees and power lines. 

Locations impacted include...
Easton, Federalsburg, Trappe, Preston, Oxford, Agner, Choptank,
Tanyard, Harmony, Hambleton and Windyhill.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

In addition to 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 these storms, and may lead to 
poor drainage flooding. Do not drive your vehicle through flooded 
roadways.

&&

LAT...LON 3883 7587 3874 7574 3866 7573 3871 7584
      3870 7590 3857 7604 3863 7608 3862 7611
      3872 7624 3873 7623
TIME...MOT...LOC 1920Z 263DEG 25KT 3869 7617 3866 7611 3854 7609 

HAIL...<.75IN
WIND...60MPH
 
$$

JRK

306 
WWUS51 KPHI 231928
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
328 PM EDT SUN JUL 23 2017

MDC011-041-231938-
/O.EXP.KPHI.SV.W.0120.000000T0000Z-170723T1930Z/
Talbot MD-Caroline MD-
328 PM EDT SUN JUL 23 2017

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN TALBOT AND
SOUTHERN CAROLINE COUNTIES WILL EXPIRE AT 330 PM EDT...
            
The storms which prompted the warning have weakened below severe
limits, and no longer pose 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 these thunderstorms.

LAT...LON 3883 7587 3874 7574 3866 7573 3871 7584
      3870 7590 3857 7604 3863 7608 3862 7611
      3872 7624 3873 7623
TIME...MOT...LOC 1928Z 264DEG 25KT 3870 7611 3867 7605 3855 7603 

$$

JRK

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 22, 10:18 PM EDT	Special Weather Statement	PHI	Caroline, Talbot	72 min
Jul 22, 11:26 PM EDT	Areal Flood Advisory	PHI	Caroline, Queen Anne's, Talbot	4 hr
Jul 23, 2:38 PM EDT	Special Weather Statement	PHI	Caroline, Kent, Queen Anne's, Talbot	67 min
Jul 23, 2:53 PM EDT	Special Weather Statement	PHI	Cecil	52 min
Jul 23, 3:16 PM EDT	Flash Flood Watch	PHI	Cecil	15 hr
Jul 23, 3:27 PM EDT	Special Weather Statement	PHI	Cecil	33 min
Jul 23, 3:31 PM EDT	Special Weather Statement	PHI	Dorchester	44 min
Jul 23, 3:53 PM EDT	Areal Flood Advisory	PHI	Cecil, Kent	4 hr
Jul 23, 4:26 PM EDT	Areal Flood Advisory	PHI	Cecil	3 hr
Jul 23, 5:40 PM EDT	Areal Flood Advisory	PHI	Cecil	4 hr
Jul 23, 5:47 PM EDT	Special Weather Statement	PHI	Cecil	28 min
Jul 23, 6:22 PM EDT	Special Weather Statement	PHI	Cecil	38 min
Jul 23, 6:26 PM EDT	Flash Flood Warning	PHI	Cecil	4 hr

Nearby

Severe Thunderstorm Warnings in Maryland, 2017 Every severe thunderstorm warning in 2017

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.