Alert archive / Delaware / Severe Thunderstorm Warnings in 2017

Severe Thunderstorm Warning 103, NWS Philadelphia/Mount Holly

July 14, 2017Kent County, Sussex County, Delaware; Caroline County, Talbot County, Maryland

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Jul 14, 2017, 6:20 PM EDT for Kent County, Sussex County, Delaware; Caroline County, Talbot County, Maryland. It was in force for 40 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: Jul 14, 2017, 6:20 PM EDT (22:20 UTC)
Expired: Jul 14, 2017, 7:00 PM EDT
In force: 40 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), 38 km from the middle of the area, began a volume at 22:22 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 14, 6:40 PM EDT	TSTM WND DMG	1 Wsw Shuffelt Acres, DE	ROUTE 20 WESTBOUND LANE CLOSED AT NORTH OAK GROVE ROAD DUE TO DOWNED TREES INTO WIRES. 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
Jul 14, 1:40 PM EDT	Severe Thunderstorm Watch	SPC	7 hr

The nearest sounding before it

Wallops Is Stn, VA (KWAL), launched 12:00Z, 10.3 hours before the alert went out and 94 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: 908 J/kg
Mixed-layer CIN: -100 J/kg
Mixed-layer LCL: 959 m above ground
0-6 km bulk shear: 23 kt
0-1 km storm-relative helicity: 56 m²/s²
0-3 km storm-relative helicity: 96 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.5

Open this sounding in Storm Lab

The text

As transmitted.

099 
WUUS51 KPHI 142220
SVRPHI
DEC001-005-MDC011-041-142300-
/O.NEW.KPHI.SV.W.0103.170714T2220Z-170714T2300Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mount Holly NJ
620 PM EDT FRI JUL 14 2017

The National Weather Service in Mount Holly NJ has issued a

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

* Until 700 PM EDT

* At 620 PM EDT, severe thunderstorms were located along a line
  extending from near Hope to Matthews to 7 miles southwest of
  Oxford, moving east at 35 mph.

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

  SOURCE...Radar indicated. 

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

* Severe thunderstorms will be near,
  Harmony around 625 PM EDT. 
  Denton around 630 PM EDT. 
  Agner around 635 PM EDT. 
  Trappe, Sandtown and Smithville around 640 PM EDT. 
  Andrewsville and Windyhill around 645 PM EDT. 
  Harrington, Bridgeville, Woodside, Viola and Choptank around 650 
  PM EDT. 
  Ellendale around 700 PM EDT. 

Other locations impacted by these severe thunderstorms include
Felton, Woodside East, Frederica, Greenwood, Farmington, Riverview,
Houston and Blades.

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.

&&

LAT...LON 3859 7606 3860 7606 3863 7608 3863 7612
      3882 7584 3911 7572 3905 7539 3876 7542
      3858 7570 3865 7571 3869 7577 3868 7580
      3870 7580 3871 7584 3868 7593 3860 7599
      3857 7602
TIME...MOT...LOC 2220Z 278DEG 31KT 3907 7591 3883 7593 3863 7628 

HAIL...0.75IN
WIND...60MPH
 
$$

Robertson

1 follow-up statement

797 
WWUS51 KPHI 142250
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
650 PM EDT FRI JUL 14 2017

DEC001-005-MDC011-041-142300-
/O.EXP.KPHI.SV.W.0103.000000T0000Z-170714T2300Z/
Sussex DE-Kent DE-Talbot MD-Caroline MD-
650 PM EDT FRI JUL 14 2017

...THE SEVERE THUNDERSTORM WARNING FOR NORTHWESTERN SUSSEX...SOUTHERN
KENT...SOUTHEASTERN TALBOT AND SOUTHERN CAROLINE COUNTIES WILL EXPIRE
AT 700 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 and southern Delaware...and eastern Maryland.

LAT...LON 3859 7606 3860 7606 3863 7608 3863 7612
      3882 7584 3911 7572 3905 7539 3876 7542
      3858 7570 3865 7571 3869 7577 3868 7580
      3870 7580 3871 7584 3868 7593 3860 7599
      3857 7602
TIME...MOT...LOC 2250Z 278DEG 31KT 3904 7560 3880 7562 3860 7597 

$$

Robertson

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 13, 8:09 PM EDT	Special Weather Statement	PHI	Kent	36 min
Jul 13, 8:29 PM EDT	Special Weather Statement	PHI	Kent	31 min
Jul 13, 10:03 PM EDT	Special Weather Statement	PHI	Sussex	27 min
Jul 13, 10:15 PM EDT	Areal Flood Advisory	PHI	Kent, Sussex	4 hr
Jul 13, 10:39 PM EDT	Severe Thunderstorm Warning	PHI	Sussex	51 min
Jul 14, 9:02 AM EDT	Special Weather Statement	PHI	New Castle	28 min
Jul 14, 11:40 AM EDT	Flash Flood Watch	PHI	Kent, New Castle	11 hr
Jul 14, 12:06 PM EDT	Heat Advisory	PHI	Kent, Sussex	7 hr
Jul 14, 2:14 PM EDT	Areal Flood Advisory	PHI	New Castle	3 hr
Jul 14, 2:31 PM EDT	Severe Thunderstorm Warning	PHI	New Castle	59 min
Jul 14, 2:53 PM EDT	Flash Flood Warning	PHI	New Castle	3 hr
Jul 14, 3:18 PM EDT	Severe Thunderstorm Warning	PHI	New Castle	12 min
Jul 14, 3:23 PM EDT	Severe Thunderstorm Warning	PHI	New Castle	67 min
Jul 14, 3:25 PM EDT	Areal Flood Advisory	PHI	New Castle	4 hr
Jul 14, 3:34 PM EDT	Flash Flood Warning	PHI	New Castle	3 hr
Jul 14, 3:54 PM EDT	Severe Thunderstorm Warning	PHI	Kent, New Castle	66 min
Jul 14, 5:14 PM EDT	Areal Flood Advisory	PHI	Kent	3 hr
Jul 14, 5:24 PM EDT	Special Weather Statement	PHI	Sussex	36 min
Jul 14, 5:30 PM EDT	River Flood Warning	PHI	New Castle	7 hr
Jul 14, 5:40 PM EDT	Severe Thunderstorm Warning	PHI	Kent	65 min
Jul 14, 5:51 PM EDT	Special Weather Statement	PHI	Sussex	39 min
Jul 14, 6:10 PM EDT	Flash Flood Warning	PHI	Kent	3 hr
Jul 14, 6:32 PM EDT	Areal Flood Advisory	PHI	Sussex	4 hr
Jul 14, 6:48 PM EDT	Special Weather Statement	PHI	Sussex	42 min
Jul 14, 7:15 PM EDT	Severe Thunderstorm Warning	PHI	Sussex	60 min
Jul 14, 9:23 AM EDT	Special Weather Statement	PHI	Cecil	37 min
Jul 14, 2:46 PM EDT	Areal Flood Advisory	PHI	Cecil	3 hr
Jul 14, 3:10 PM EDT	Flash Flood Warning	PHI	Cecil	2 hr
Jul 14, 3:52 PM EDT	Flash Flood Warning	PHI	Talbot	53 min
Jul 14, 3:57 PM EDT	Flash Flood Warning	PHI	Cecil, Kent	2 hr
Jul 14, 4:00 PM EDT	Special Weather Statement	PHI	Caroline	45 min
Jul 14, 4:05 PM EDT	Special Weather Statement	PHI	Kent	40 min
Jul 14, 4:48 PM EDT	Special Weather Statement	PHI	Queen Anne's	27 min
Jul 14, 4:59 PM EDT	Flash Flood Warning	PHI	Queen Anne's	4 hr
Jul 14, 5:27 PM EDT	Special Weather Statement	PHI	Queen Anne's	63 min
Jul 14, 5:54 PM EDT	Severe Thunderstorm Warning	PHI	Caroline, Talbot	51 min
Jul 14, 5:58 PM EDT	Flash Flood Warning	PHI	Talbot	3 hr

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.