Alert archive / Maryland / Severe Thunderstorm Warnings in 2019

Severe Thunderstorm Warning 342, NWS Philadelphia/Mount Holly

August 7, 2019Caroline County, Talbot County, Maryland; Kent County, Sussex County, Delaware

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Aug 7, 2019, 5:53 PM EDT for Caroline County, Talbot County, Maryland; Kent County, Sussex County, Delaware. It was in force for 52 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: Aug 7, 2019, 5:53 PM EDT (21:53 UTC)
Expired: Aug 7, 2019, 6:45 PM EDT
In force: 52 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

Counties Kent County, DE, Sussex County, DE, Caroline County, MD, Talbot County, MD

The radar

The Dover AFB radar (KDOX), 23 km from the middle of the area, began a volume at 21:55 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 7, 6:19 PM EDT	TSTM WND DMG	2 E Tanyard, MD	LARGE TREE LIMBS DOWN ON PRESTON BRIDGE RD. TIME ESTIMATED FROM RADAR.
Aug 7, 6:30 PM EDT	TSTM WND DMG	1 Nne Greenwood, DE	SEVERAL TREES DOWN IN WESTERN SUSSEX COUNTY RESULTING IN SEVERAL POWER OUTAGES. TIME ESTIMATED FROM RADAR.

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
Aug 7, 2:10 PM EDT	Severe Thunderstorm Watch	SPC	7 hr

The nearest sounding before it

Wallops Is Stn, VA (KWAL), launched 12:00Z, 9.9 hours before the alert went out and 95 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: 1339 J/kg
Mixed-layer CIN: -52 J/kg
Mixed-layer LCL: 1118 m above ground
0-6 km bulk shear: 31 kt
0-1 km storm-relative helicity: 43 m²/s²
0-3 km storm-relative helicity: 60 m²/s²
Significant tornado parameter: 0.2
Supercell composite: 1.1

Open this sounding in Storm Lab

The text

As transmitted.

972 
WUUS51 KPHI 072153
SVRPHI
DEC001-005-MDC011-041-072245-
/O.NEW.KPHI.SV.W.0342.190807T2153Z-190807T2245Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mount Holly NJ
553 PM EDT Wed Aug 7 2019

The National Weather Service in Mount Holly NJ has issued a

* Severe Thunderstorm Warning for...
  Central Sussex County in southern Delaware...
  Southern Kent County in central Delaware...
  Eastern Talbot County in eastern Maryland...
  Caroline County in eastern Maryland...

* Until 645 PM EDT.

* At 552 PM EDT, a severe thunderstorm was located over Griffin, or
  12 miles northeast of Easton, moving east at 45 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...
  Georgetown, Milford, Seaford, Denton, Harrington, Federalsburg,
  Milton, Bridgeville, Preston, Ellendale, Tanyard, Harmony,
  Smithville, Agner, Matthews, Choptank, Griffin, Windyhill, Cordova
  and Andrewsville.

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.

&&

LAT...LON 3864 7605 3889 7599 3900 7533 3894 7531
      3893 7532 3888 7527 3867 7523 3865 7573
      3869 7577 3868 7580 3870 7580 3871 7584
      3868 7593 3864 7596
TIME...MOT...LOC 2152Z 262DEG 41KT 3886 7587 

HAIL...0.75IN
WIND...60MPH
 
$$

MPS

2 follow-up statements

295 
WWUS51 KPHI 072230
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
630 PM EDT Wed Aug 7 2019

MDC041-072239-
/O.CAN.KPHI.SV.W.0342.000000T0000Z-190807T2245Z/
Talbot MD-
630 PM EDT Wed Aug 7 2019

...THE SEVERE THUNDERSTORM WARNING FOR EASTERN TALBOT 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 900 PM EDT for
central and southern Delaware...and eastern Maryland.

LAT...LON 3870 7587 3891 7586 3898 7545 3897 7545
      3866 7548 3865 7573 3869 7577 3868 7580
      3870 7580 3871 7584
TIME...MOT...LOC 2229Z 269DEG 27KT 3879 7570 

$$

DEC001-005-MDC011-072245-
/O.CON.KPHI.SV.W.0342.000000T0000Z-190807T2245Z/
Sussex DE-Kent DE-Caroline MD-
630 PM EDT Wed Aug 7 2019

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 645 PM EDT
FOR NORTHWESTERN SUSSEX...SOUTHWESTERN KENT AND SOUTHEASTERN CAROLINE
COUNTIES...

At 629 PM EDT, a severe thunderstorm was located over Smithville, or
14 miles northeast of Hurlock, moving east at 30 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...
Milford, Seaford, Denton, Harrington, Federalsburg, Bridgeville,
Agner, Smithville, Andrewsville, Greenwood, Houston and Farmington.

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.

Continuous 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 3870 7587 3891 7586 3898 7545 3897 7545
      3866 7548 3865 7573 3869 7577 3868 7580
      3870 7580 3871 7584
TIME...MOT...LOC 2229Z 269DEG 27KT 3879 7570 

HAIL...0.75IN
WIND...60MPH
 
$$

MPS

222 
WWUS51 KPHI 072240
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
640 PM EDT Wed Aug 7 2019

DEC001-005-MDC011-072249-
/O.EXP.KPHI.SV.W.0342.000000T0000Z-190807T2245Z/
Sussex DE-Kent DE-Caroline MD-
640 PM EDT Wed Aug 7 2019

...THE SEVERE THUNDERSTORM WARNING FOR NORTHWESTERN SUSSEX...
SOUTHWESTERN KENT AND SOUTHEASTERN CAROLINE COUNTIES WILL EXPIRE AT
645 PM EDT...
    
The severe thunderstorm which prompted the warning has moved out of 
the warned area. Therefore, the warning will be allowed to expire. 
However, gusty winds and heavy rain are still possible with this 
thunderstorm.

A severe thunderstorm watch remains in effect until 900 PM EDT for
central and southern Delaware...and 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.

Remember, a Severe Thunderstorm Warning still remains in effect for 
Sussex, Kent, and Caroline counties until 7:30 pm.

LAT...LON 3870 7587 3891 7586 3898 7545 3897 7545
      3866 7548 3865 7573 3869 7577 3868 7580
      3870 7580 3871 7584
TIME...MOT...LOC 2239Z 262DEG 41KT 3881 7556 

$$

MPS

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 6, 10:29 PM EDT	Special Weather Statement	PHI	Talbot	46 min
Aug 7, 4:07 PM EDT	Severe Thunderstorm Warning	PHI	Cecil, Kent, Queen Anne's	53 min
Aug 7, 4:57 PM EDT	Severe Thunderstorm Warning	PHI	Caroline, Cecil, Kent, Queen Anne's, Talbot	63 min
Aug 7, 5:33 PM EDT	Severe Thunderstorm Warning	PHI	Caroline, Cecil, Kent, Queen Anne's, Talbot	42 min
Aug 7, 6:39 PM EDT	Severe Thunderstorm Warning	PHI	Caroline	51 min
Aug 7, 10:02 AM EDT	Flash Flood Watch	PHI	New Castle	11 hr
Aug 7, 1:46 PM EDT	Special Weather Statement	PHI	Sussex	29 min
Aug 7, 1:49 PM EDT	Severe Thunderstorm Warning	PHI	Sussex	41 min
Aug 7, 4:27 PM EDT	Severe Thunderstorm Warning	PHI	New Castle	63 min
Aug 7, 4:44 PM EDT	Special Weather Statement	PHI	New Castle	31 min
Aug 7, 5:16 PM EDT	Severe Thunderstorm Warning	PHI	New Castle	59 min
Aug 7, 6:01 PM EDT	Areal Flood Advisory	PHI	New Castle	3 hr
Aug 7, 7:23 PM EDT	Special Weather Statement	PHI	Sussex	37 min
Aug 7, 7:54 PM EDT	Special Weather Statement	PHI	Sussex	36 min

Nearby

Severe Thunderstorm Warnings in Maryland, 2019 Severe Thunderstorm Warnings in Delaware, 2019 Every severe thunderstorm warning in 2019

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.