Alert archive / Delaware / Severe Thunderstorm Warnings in 2017

Severe Thunderstorm Warning 92, NWS Philadelphia/Mount Holly

July 13, 2017Sussex County, Delaware

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Jul 13, 2017, 10:39 PM EDT for Sussex County, Delaware. It was in force for 51 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Jul 13, 2017, 10:39 PM EDT (02:39 UTC)
Expired: Jul 13, 2017, 11:30 PM EDT
In force: 51 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

County Sussex County, DE

The radar

The Dover AFB radar (KDOX), 5 km from the middle of the area, began a volume at 02:40 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.

The nearest sounding before it

Wallops Is Stn, VA (KWAL), launched 00:00Z, 2.7 hours before the alert went out and 95 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: 2637 J/kg
Mixed-layer CIN: -16 J/kg
Mixed-layer LCL: 1330 m above ground
0-6 km bulk shear: 24 kt
0-1 km storm-relative helicity: 75 m²/s²
0-3 km storm-relative helicity: 136 m²/s²
Significant tornado parameter: 0.6
Supercell composite: 3.4

Open this sounding in Storm Lab

The text

As transmitted.

780 
WUUS51 KPHI 140239
SVRPHI
DEC005-140330-
/O.NEW.KPHI.SV.W.0092.170714T0239Z-170714T0330Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mount Holly NJ
1039 PM EDT THU JUL 13 2017

The National Weather Service in Mount Holly NJ has issued a

* Severe Thunderstorm Warning for...
  Central Sussex County in southern Delaware...

* Until 1130 PM EDT

* At 1038 PM EDT, a severe thunderstorm was located near Bridgeville,
  or 10 miles northwest of Georgetown, moving east at 25 mph.

  HAZARD...60 mph wind gusts. 

  SOURCE...Radar indicated. 

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

* Locations impacted include...
  Georgetown, Milford, Lewes, Milton, Bridgeville, Ellendale,
  Henlopen Acres, Cape Henlopen State Park and Greenwood.

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.

&&

LAT...LON 3867 7568 3883 7569 3884 7555 3889 7550
      3890 7525 3881 7514 3881 7508 3864 7508
TIME...MOT...LOC 0238Z 269DEG 22KT 3878 7555 

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

Meola

1 follow-up statement

294 
WWUS51 KPHI 140321
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
1121 PM EDT THU JUL 13 2017

DEC005-140330-
/O.CON.KPHI.SV.W.0092.000000T0000Z-170714T0330Z/
Sussex DE-
1121 PM EDT THU JUL 13 2017

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1130 PM EDT
FOR EAST CENTRAL SUSSEX COUNTY...

At 1120 PM EDT, a severe thunderstorm was located over Henlopen
Acres, or 15 miles east of Georgetown, moving east at 30 mph.

HAZARD...60 mph wind gusts. 

SOURCE...Radar indicated. 

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

Locations impacted include...
Lewes, Henlopen Acres and Cape Henlopen State Park. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3864 7520 3865 7521 3881 7514 3881 7508
      3864 7508
TIME...MOT...LOC 0320Z 265DEG 24KT 3871 7510 

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
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 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, 6:20 PM EDT	Severe Thunderstorm Warning	PHI	Kent, Sussex	40 min
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

Nearby

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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.