Alert archive / Maryland / Severe Thunderstorm Warnings in 2017

Severe Thunderstorm Warning 49, NWS Philadelphia/Mount Holly

June 19, 20175 counties in Maryland; Kent County, New Castle County, Delaware

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Jun 19, 2017, 4:38 PM EDT for 5 counties in Maryland; Kent County, New Castle County, Delaware. It was in force for 52 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: Jun 19, 2017, 4:38 PM EDT (20:38 UTC)
Expired: Jun 19, 2017, 5:30 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, 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), 66 km from the middle of the area, began a volume at 20:40 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
Jun 19, 4:40 PM EDT	TSTM WND DMG	Saint Michaels, MD	A FEW TREES BLOWN DOWN. 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
Jun 19, 11:13 AM EDT	Severe Thunderstorm Watch	SPC	9 hr

The nearest sounding before it

Washington/Dulle, VA (KIAD), launched 12:00Z, 8.6 hours before the alert went out and 105 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: 448 J/kg
Mixed-layer CIN: -97 J/kg
Mixed-layer LCL: 1049 m above ground
0-6 km bulk shear: 24 kt
0-1 km storm-relative helicity: 73 m²/s²
0-3 km storm-relative helicity: 82 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.2

Open this sounding in Storm Lab

The text

As transmitted.

153 
WUUS51 KPHI 192038
SVRPHI
DEC001-003-MDC011-015-029-035-041-192130-
/O.NEW.KPHI.SV.W.0049.170619T2038Z-170619T2130Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mount Holly NJ
438 PM EDT MON JUN 19 2017

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...
  Northern 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 530 PM EDT

* At 437 PM EDT, severe thunderstorms were located along a line
  extending from near Rock Hall to Romancoke, moving east at 45 mph.

  HAZARD...60 mph wind gusts. 

  SOURCE...Radar indicated. 

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

* Locations impacted include...
  Dover, Middletown, Easton, Centerville, Talbot, Smyrna,
  Chestertown, Denton, Centreville, Harrington, Romancoke, Camden,
  Clayton, Greensboro, Oakland, Ridgely, Cheswold, Rock Hall, St.
  Michaels and Church Hill.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

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.

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

&&

LAT...LON 3890 7637 3901 7620 3901 7621 3917 7628
      3932 7618 3951 7561 3891 7546 3877 7632
      3877 7633 3885 7627 3881 7620 3883 7619
      3897 7625 3884 7637 3885 7638
TIME...MOT...LOC 2037Z 256DEG 38KT 3919 7632 3887 7634 

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

Meola

1 follow-up statement

310 
WWUS51 KPHI 192117
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
517 PM EDT MON JUN 19 2017

DEC001-003-MDC011-015-029-035-041-192130-
/O.CON.KPHI.SV.W.0049.000000T0000Z-170619T2130Z/
New Castle DE-Kent DE-Talbot MD-Queen Anne's MD-Caroline MD-Kent MD-
Cecil MD-
517 PM EDT MON JUN 19 2017

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 530 PM EDT
FOR SOUTHWESTERN NEW CASTLE...WESTERN KENT...NORTHEASTERN TALBOT...
QUEEN ANNE'S...NORTHERN CAROLINE...NORTHEASTERN KENT AND SOUTHEASTERN
CECIL COUNTIES...

At 517 PM EDT, severe thunderstorms were located along a line
extending from near Delaney Corner to Griffin, moving northeast at 35
mph.

HAZARD...60 mph wind gusts. 

SOURCE...Radar indicated. 

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

Locations impacted include...
Dover, Middletown, Centerville, Smyrna, Chestertown, Denton,
Centreville, Harrington, Camden, Clayton, Greensboro, Oakland,
Ridgely, Cheswold, Church Hill, Cecilton, Millington, Sudlersville,
Goldsboro and Queen Anne.

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

&&

LAT...LON 3941 7590 3951 7561 3891 7546 3885 7613
      3921 7608
TIME...MOT...LOC 2117Z 241DEG 30KT 3930 7570 3888 7590 

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

Meola

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 19, 3:45 PM EDT	Areal Flood Advisory	PHI	Cecil, Kent, Queen Anne's	3 hr
Jun 19, 4:07 PM EDT	Severe Thunderstorm Warning	PHI	Cecil	38 min
Jun 19, 4:17 PM EDT	Special Weather Statement	PHI	Cecil, Kent, Queen Anne's	58 min
Jun 19, 4:59 PM EDT	Severe Thunderstorm Warning	PHI	Caroline, Talbot	46 min
Jun 19, 5:14 PM EDT	Areal Flood Advisory	PHI	Caroline, Kent, Queen Anne's, Talbot	3 hr
Jun 19, 5:28 PM EDT	Severe Thunderstorm Warning	PHI	Caroline	62 min
Jun 19, 5:38 PM EDT	Severe Thunderstorm Warning	PHI	Caroline, Talbot	67 min
Jun 19, 4:07 PM EDT	Severe Thunderstorm Warning	PHI	New Castle	38 min
Jun 19, 4:34 PM EDT	Severe Thunderstorm Warning	PHI	New Castle	41 min
Jun 19, 4:42 PM EDT	Areal Flood Advisory	PHI	New Castle	3 hr
Jun 19, 6:17 PM EDT	Tornado Warning	PHI	Kent, Sussex	16 min
Jun 19, 6:52 PM EDT	Special Weather Statement	PHI	Sussex	23 min
Jun 19, 7:30 PM EDT	Severe Thunderstorm Warning	PHI	Sussex	45 min
Jun 19, 7:34 PM EDT	Areal Flood Advisory	PHI	Sussex	3 hr

Nearby

Severe Thunderstorm Warnings in Maryland, 2017 Severe Thunderstorm Warnings in Delaware, 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.