Alert archive / Delaware / Severe Thunderstorm Warnings in 2017

Severe Thunderstorm Warning 50, NWS Philadelphia/Mount Holly

June 19, 2017Kent County, Sussex County, Delaware; Caroline County, Talbot County, Maryland

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Jun 19, 2017, 4:59 PM EDT for Kent County, Sussex County, Delaware; Caroline County, Talbot County, Maryland. It was in force for 46 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: Jun 19, 2017, 4:59 PM EDT (20:59 UTC)
Expired: Jun 19, 2017, 5:45 PM EDT
In force: 46 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), 36 km from the middle of the area, began a volume at 20:59 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, 5:20 PM EDT	TSTM WND DMG	Harmony, MD	SEVERAL TREES AND WIRES BLOWN DOWN. TIME ESTIMATED FROM RADAR.
Jun 19, 5:25 PM EDT	TSTM WND DMG	Preston, MD	SEVERAL TREES AND WIRES 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

Wallops Is Stn, VA (KWAL), launched 12:00Z, 9.0 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: 419 J/kg
Mixed-layer CIN: -126 J/kg
Mixed-layer LCL: 1020 m above ground
0-6 km bulk shear: 35 kt
0-1 km storm-relative helicity: 85 m²/s²
0-3 km storm-relative helicity: 97 m²/s²
Significant tornado parameter: 0.1
Supercell composite: 0.8

Open this sounding in Storm Lab

The text

As transmitted.

000 
WUUS51 KPHI 192059
SVRPHI
DEC001-005-MDC011-041-192145-
/O.NEW.KPHI.SV.W.0050.170619T2059Z-170619T2145Z/

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

The National Weather Service in Mount Holly NJ has issued a

* Severe Thunderstorm Warning for...
  Northwestern Sussex County in southern Delaware...
  Southwestern Kent County in central Delaware...
  Northeastern Talbot County in eastern Maryland...
  Southern Caroline County in eastern Maryland...

* Until 545 PM EDT

* At 459 PM EDT, a severe thunderstorm was located over Easton,
  moving northeast at 35 mph.

  HAZARD...60 mph wind gusts. 

  SOURCE...Radar indicated. 

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

* Locations impacted include...
  Easton, Milford, Denton, Harrington, Preston, Ellendale, Tanyard,
  Harmony, Smithville, Copperville, Agner, Matthews, Hambleton,
  Griffin, Cordova, Andrewsville, Felton, Greenwood, Houston and
  Farmington.

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 this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.

&&

LAT...LON 3867 7608 3883 7618 3905 7549 3879 7542
TIME...MOT...LOC 2059Z 243DEG 30KT 3879 7605 

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

Meola

1 follow-up statement

396 
WWUS51 KPHI 192139
SVSPHI

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

DEC001-005-MDC011-041-192149-
/O.EXP.KPHI.SV.W.0050.000000T0000Z-170619T2145Z/
Sussex DE-Kent DE-Talbot MD-Caroline MD-
539 PM EDT MON JUN 19 2017

...THE SEVERE THUNDERSTORM WARNING FOR NORTHWESTERN SUSSEX...
SOUTHWESTERN KENT...NORTHEASTERN TALBOT AND SOUTHERN CAROLINE
COUNTIES WILL EXPIRE AT 545 PM EDT...
                
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 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 800 PM EDT for
central and southern Delaware...and eastern Maryland.

LAT...LON 3867 7608 3883 7618 3905 7549 3879 7542
TIME...MOT...LOC 2139Z 243DEG 30KT 3894 7567 

$$

Meola

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 19, 4:07 PM EDT	Severe Thunderstorm Warning	PHI	New Castle	38 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, 4:38 PM EDT	Severe Thunderstorm Warning	PHI	Kent, New Castle	52 min
Jun 19, 4:42 PM EDT	Areal Flood Advisory	PHI	New Castle	3 hr
Jun 19, 5:14 PM EDT	Areal Flood Advisory	PHI	Kent, New Castle, Sussex	3 hr
Jun 19, 5:28 PM EDT	Severe Thunderstorm Warning	PHI	Kent, New Castle	62 min
Jun 19, 5:38 PM EDT	Severe Thunderstorm Warning	PHI	Kent, Sussex	67 min
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
Jun 19, 3:45 PM EDT	Areal Flood Advisory	PHI	Cecil, Kent, Queen Anne's	3 hr
Jun 19, 4:17 PM EDT	Special Weather Statement	PHI	Cecil, Kent, Queen Anne's	58 min

Nearby

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