Alert archive / Maryland / Severe Thunderstorm Warnings in 2019

Severe Thunderstorm Warning 369, NWS Philadelphia/Mount Holly

August 19, 2019Caroline County, Maryland; Sussex County, Delaware

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Aug 19, 2019, 4:46 PM EDT for Caroline County, Maryland; Sussex County, Delaware. It was in force for 46 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: Aug 19, 2019, 4:46 PM EDT (20:46 UTC)
Expired: Aug 19, 2019, 5:32 PM EDT
In force: 46 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Sussex County, DE, Caroline County, MD

The radar

The Dover AFB radar (KDOX), 26 km from the middle of the area, began a volume at 20:47 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
Aug 19, 4:47 PM EDT	TSTM WND DMG	3 S Bridgeville, DE	SOCIAL MEDIA REPORTS OF SEVERAL DOWNED TREES BETWEEN SEAFORD AND BRIDGEVILLE. 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

Wallops Is Stn, VA (KWAL), launched 12:00Z, 8.8 hours before the alert went out and 86 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: 1552 J/kg
Mixed-layer CIN: -43 J/kg
Mixed-layer LCL: 1081 m above ground
0-6 km bulk shear: 17 kt
0-1 km storm-relative helicity: 54 m²/s²
0-3 km storm-relative helicity: 48 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

587 
WUUS51 KPHI 192046
SVRPHI
DEC005-MDC011-192145-
/O.NEW.KPHI.SV.W.0369.190819T2046Z-190819T2145Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mount Holly NJ
446 PM EDT Mon Aug 19 2019

The National Weather Service in Mount Holly NJ has issued a

* Severe Thunderstorm Warning for...
  Southwestern Sussex County in southern Delaware...
  Southeastern Caroline County in eastern Maryland...

* Until 545 PM EDT.

* At 446 PM EDT, a severe thunderstorm was located near Seaford, or 9
  miles west of Georgetown, moving east at 10 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...
  Georgetown, Seaford, Federalsburg, Bridgeville, Sycamore and
  Blades.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

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

&&

LAT...LON 3863 7571 3865 7571 3869 7577 3868 7578
      3869 7578 3873 7581 3880 7537 3856 7537
TIME...MOT...LOC 2046Z 277DEG 9KT 3869 7557 

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

Staarmann

2 follow-up statements

728 
WWUS51 KPHI 192116
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
516 PM EDT Mon Aug 19 2019

DEC005-MDC011-192145-
/O.CON.KPHI.SV.W.0369.000000T0000Z-190819T2145Z/
Sussex DE-Caroline MD-
516 PM EDT Mon Aug 19 2019

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 545 PM EDT
FOR WEST CENTRAL SUSSEX AND SOUTHEASTERN CAROLINE COUNTIES...

At 515 PM EDT, a severe thunderstorm was located over Seaford, or 12
miles east of Hurlock, and is nearly stationary.

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...
Georgetown, Seaford, Sycamore and Blades. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3868 7576 3872 7575 3871 7540 3857 7543
      3863 7571 3865 7571
TIME...MOT...LOC 2115Z 307DEG 3KT 3866 7565 

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

Staarmann

034 
WWUS51 KPHI 192132
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
532 PM EDT Mon Aug 19 2019

DEC005-MDC011-192142-
/O.CAN.KPHI.SV.W.0369.000000T0000Z-190819T2145Z/
Sussex DE-Caroline MD-
532 PM EDT Mon Aug 19 2019

...THE SEVERE THUNDERSTORM WARNING FOR WEST CENTRAL SUSSEX AND
SOUTHEASTERN 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.

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 3868 7576 3872 7575 3871 7540 3857 7543
      3863 7571 3865 7571
TIME...MOT...LOC 2131Z 277DEG 9KT 3865 7560 

$$

Staarmann

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 19, 6:42 PM EDT	Severe Thunderstorm Warning	PHI	Caroline, Talbot	51 min
Aug 19, 12:57 PM EDT	Special Weather Statement	PHI	Sussex	48 min
Aug 19, 1:43 PM EDT	Special Weather Statement	PHI	Sussex	47 min
Aug 19, 1:56 PM EDT	Severe Thunderstorm Warning	PHI	Sussex	49 min
Aug 19, 2:39 PM EDT	Areal Flood Advisory	PHI	Sussex	2 hr
Aug 19, 3:00 PM EDT	Severe Thunderstorm Warning	PHI	Sussex	45 min
Aug 19, 3:28 PM EDT	Flash Flood Warning	PHI	Sussex	3 hr
Aug 19, 4:40 PM EDT	Special Weather Statement	PHI	Sussex	50 min
Aug 19, 4:41 PM EDT	Special Weather Statement	PHI	Kent	49 min
Aug 19, 4:52 PM EDT	Areal Flood Advisory	PHI	Sussex	68 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.