Alert archive / Maryland / Severe Thunderstorm Warnings in 2019

Severe Thunderstorm Warning 219, NWS Philadelphia/Mount Holly

July 11, 20195 counties in Maryland; Kent County, New Castle County, Delaware

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Jul 11, 2019, 5:44 PM EDT for 5 counties in Maryland; Kent County, New Castle County, Delaware. It was in force for 61 min. 4 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 11, 2019, 5:44 PM EDT (21:44 UTC)
Expired: Jul 11, 2019, 6:45 PM EDT
In force: 61 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon
Hail: 1.0 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), 61 km from the middle of the area, began a volume at 21:45 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 11, 5:55 PM EDT	TSTM WND DMG	1 Sw Queenstown, MD	TREES DOWN FROM GRASONVILLE TO QUEENSTOWN.
Jul 11, 5:55 PM EDT	TSTM WND DMG	1 Sw Queenstown, MD	TREES DOWN FROM GRASONVILLE TO QUEENSTOWN.
Jul 11, 6:00 PM EDT	TSTM WND GST 51	Grasonville, MD
Jul 11, 6:00 PM EDT	TSTM WND GST 51	Grasonville, 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, 9.7 hours before the alert went out and 135 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: 114 J/kg
Mixed-layer CIN: -122 J/kg
Mixed-layer LCL: 1075 m above ground
0-6 km bulk shear: 23 kt
0-1 km storm-relative helicity: 74 m²/s²
0-3 km storm-relative helicity: 102 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

603 
WUUS51 KPHI 112144
SVRPHI
DEC001-003-MDC011-015-029-035-041-112245-
/O.NEW.KPHI.SV.W.0219.190711T2144Z-190711T2245Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mount Holly NJ
544 PM EDT Thu Jul 11 2019

The National Weather Service in Mount Holly NJ has issued a

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

* Until 645 PM EDT.

* At 544 PM EDT, severe thunderstorms were located along a line
  extending from near Betterton to near Grasonville, moving east at
  30 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...
  Dover, Middletown, Centerville, Smyrna, Chestertown, Centreville,
  Camden, Clayton, Greensboro, Oakland, Delaware City, Ridgely,
  Cheswold, Church Hill, Cecilton, Millington, Sudlersville,
  Goldsboro, Queen Anne and Woodside.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

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

&&

LAT...LON 3898 7620 3900 7617 3901 7619 3938 7606
      3942 7600 3948 7600 3959 7556 3958 7558
      3951 7556 3949 7559 3946 7559 3934 7548
      3896 7561 3887 7620 3893 7621
TIME...MOT...LOC 2144Z 249DEG 28KT 3937 7600 3899 7614 

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

Iovino

1 follow-up statement

543 
WWUS51 KPHI 112218
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
618 PM EDT Thu Jul 11 2019

DEC001-003-MDC011-015-029-035-041-112245-
/O.CON.KPHI.SV.W.0219.000000T0000Z-190711T2245Z/
New Castle DE-Kent DE-Talbot MD-Queen Anne's MD-Caroline MD-Kent MD-
Cecil MD-
618 PM EDT Thu Jul 11 2019

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 645 PM EDT
FOR SOUTHWESTERN NEW CASTLE...WESTERN KENT...NORTHEASTERN TALBOT...
QUEEN ANNE'S...NORTHERN CAROLINE...NORTHEASTERN KENT AND SOUTHEASTERN
CECIL COUNTIES...

At 617 PM EDT, severe thunderstorms were located along a line
extending from Middletown to near Goldsboro, moving east at 30 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...
Dover, Middletown, Centerville, Smyrna, Centreville, Camden, Clayton,
Greensboro, Oakland, Delaware City, Ridgely, Cheswold, Church Hill,
Cecilton, Millington, Sudlersville, Goldsboro, Queen Anne, Woodside
and Hartly.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

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

&&

LAT...LON 3900 7617 3952 7584 3959 7556 3958 7558
      3951 7556 3949 7559 3946 7559 3934 7548
      3896 7561 3888 7613
TIME...MOT...LOC 2217Z 249DEG 28KT 3946 7569 3908 7583 

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

Iovino

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 11, 3:44 AM EDT	Flash Flood Watch	PHI	Cecil	18 hr
Jul 11, 12:33 PM EDT	Special Weather Statement	PHI	Cecil, Kent	57 min
Jul 11, 3:37 PM EDT	Special Weather Statement	PHI	Cecil	53 min
Jul 11, 4:55 PM EDT	Special Weather Statement	PHI	Cecil, Kent, Queen Anne's	65 min
Jul 11, 5:12 PM EDT	Flash Flood Warning	PHI	Cecil, Kent	4 hr
Jul 11, 5:45 PM EDT	Areal Flood Advisory	PHI	Cecil, Kent, Queen Anne's, Talbot	4 hr
Jul 11, 6:15 PM EDT	Flash Flood Warning	PHI	Kent	4 hr
Jul 11, 6:39 PM EDT	Areal Flood Advisory	PHI	Caroline, Kent, Queen Anne's, Talbot	4 hr
Jul 11, 7:36 PM EDT	Special Weather Statement	PHI	Caroline	54 min
Jul 11, 1:23 PM EDT	Special Weather Statement	PHI	New Castle	52 min
Jul 11, 1:44 PM EDT	Severe Thunderstorm Warning	PHI	New Castle	61 min
Jul 11, 6:14 PM EDT	Severe Thunderstorm Warning	PHI	New Castle	61 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.