Alert archive / Maryland / Severe Thunderstorm Warnings in 2019

Severe Thunderstorm Warning 339, NWS Philadelphia/Mount Holly

August 7, 20195 counties in Maryland; Kent County, New Castle County, Delaware

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Aug 7, 2019, 5:33 PM EDT for 5 counties in Maryland; Kent County, New Castle County, Delaware. It was in force for 42 min. 6 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, 5:33 PM EDT (21:33 UTC)
Expired: Aug 7, 2019, 6:15 PM EDT
In force: 42 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon
Hail: 0.88 in
Wind: 60.0 mph

Counties Kent County, DE, New Castle County, DE, Caroline County, MD, Cecil County, MD, Kent County, MD, Queen Anne's County, MD, Talbot County, MD

The radar

The Dover AFB radar (KDOX), 49 km from the middle of the area, began a volume at 21:33 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, 5:33 PM EDT	TSTM WND DMG	1 W Templeville, MD	TREE DOWN ON MD-302 AT WOODYARD RD. TIME ESTIMATED FROM RADAR.
Aug 7, 5:50 PM EDT	TSTM WND DMG	Edge Hill, DE	TREES AND WIRES BLOWN DOWN. TIME ESTIMATED FROM RADAR.
Aug 7, 5:52 PM EDT	TSTM WND GST 51	3 E Highland Acres, DE
Aug 7, 5:55 PM EDT	TSTM WND DMG	Felton, DE	SEVERAL TREES BLOWN DOWN IN WESTERN KENT COUNTY RESULTING IN SEVERAL POWER OUTAGES. TIME ESTIMATED FROM RADAR.
Aug 7, 5:59 PM EDT	MARINE TSTM WIND 42	3 S Kitts Hummock, DE	BOWERS BEACH.
Aug 7, 6:02 PM EDT	TSTM WND DMG	1 Ese Wyoming, DE	TREES AND WIRES DOWN IN CAMDEN. 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, 9.6 hours before the alert went out and 147 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.

493 
WUUS51 KPHI 072133
SVRPHI
DEC001-003-MDC011-015-029-035-041-072215-
/O.NEW.KPHI.SV.W.0339.190807T2133Z-190807T2215Z/

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

The National Weather Service in Mount Holly NJ has issued a

* Severe Thunderstorm Warning for...
  Southwestern New Castle County in northern Delaware...
  Kent County in central Delaware...
  Northeastern Talbot County in eastern Maryland...
  Eastern Queen Anne's County in northeastern Maryland...
  Northern Caroline County in eastern Maryland...
  Northeastern Kent County in northeastern Maryland...
  Southeastern Cecil County in northeastern Maryland...

* Until 615 PM EDT.

* At 533 PM EDT, severe thunderstorms were located along a line
  extending from near Warwick to near Goldsboro to near Skipton,
  moving east at 40 mph.

  HAZARD...60 mph wind gusts and nickel size hail.

  SOURCE...Radar indicated.

  IMPACT...Damage to roofs, siding, trees, and power lines is 
           possible.

* Locations impacted include...
  Dover, Middletown, Smyrna, Milford, Denton, Harrington, Camden,
  Clayton, Greensboro, Oakland, Ridgely, Cheswold, Millington,
  Bowers, Goldsboro, Queen Anne, Woodside, Viola, Hartly and
  Hazlettville.

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 these storms. 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
flash flooding. Do not drive your vehicle through flooded roadways.

&&

LAT...LON 3883 7615 3908 7585 3944 7583 3952 7558
      3951 7556 3949 7559 3944 7558 3941 7554
      3937 7552 3935 7549 3934 7550 3931 7543
      3925 7540 3907 7541 3900 7533 3891 7543
TIME...MOT...LOC 2133Z 253DEG 37KT 3939 7577 3910 7578 3891 7602 

HAIL...0.88IN
WIND...60MPH
 
$$

MPS

1 follow-up statement

261 
WWUS51 KPHI 072206
SVSPHI

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

DEC001-003-MDC011-015-029-035-041-072215-
/O.EXP.KPHI.SV.W.0339.000000T0000Z-190807T2215Z/
New Castle DE-Kent DE-Talbot MD-Queen Anne's MD-Caroline MD-Kent MD-
Cecil MD-
606 PM EDT Wed Aug 7 2019

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHWESTERN NEW CASTLE...
KENT...NORTHEASTERN TALBOT...EASTERN QUEEN ANNE'S...NORTHERN
CAROLINE...NORTHEASTERN KENT AND SOUTHEASTERN CECIL COUNTIES WILL
EXPIRE AT 615 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.

A severe thunderstorm watch remains in effect until 900 PM EDT for
central, northern and southern Delaware...and 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 3883 7615 3908 7585 3944 7583 3952 7558
      3951 7556 3949 7559 3944 7558 3941 7554
      3937 7552 3935 7549 3934 7550 3931 7543
      3925 7540 3907 7541 3900 7533 3891 7543
TIME...MOT...LOC 2205Z 255DEG 19KT 3944 7556 3914 7557 3892 7586 

$$

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, 5:53 PM EDT	Severe Thunderstorm Warning	PHI	Caroline, Talbot	52 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.