Alert archive / Delaware / Severe Thunderstorm Warnings in 2018

Severe Thunderstorm Warning 110, NWS Philadelphia/Mount Holly

November 6, 2018Sussex County, Delaware

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Nov 6, 2018, 1:48 PM EST for Sussex County, Delaware. It was in force for 42 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: Nov 6, 2018, 1:48 PM EST (18:48 UTC)
Expired: Nov 6, 2018, 2:30 PM EST
In force: 42 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), 14 km from the middle of the area, began a volume at 18:50 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 12:00Z, 6.8 hours before the alert went out and 88 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 522 m above ground
0-6 km bulk shear: 49 kt
0-1 km storm-relative helicity: 187 m²/s²
0-3 km storm-relative helicity: 256 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

590 
WUUS51 KPHI 061848
SVRPHI
DEC005-061930-
/O.NEW.KPHI.SV.W.0110.181106T1848Z-181106T1930Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mount Holly NJ
148 PM EST TUE NOV 6 2018

The National Weather Service in Mount Holly NJ has issued a

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

* Until 230 PM EST.

* At 147 PM EST, severe thunderstorms were located along a line 
  extending from near Andrewsville to near Vienna in Maryland, 
  moving east at 35 mph.

  HAZARD...60 mph wind gusts.

  SOURCE...Radar indicated.

  IMPACT...Damage to roofs, siding, trees, and power lines is 
           possible.

* Locations impacted include...
  Georgetown, Milford, Seaford, Laurel, Milton, Bridgeville, Delmar,
  Ellendale, Sycamore, Blades, Greenwood and Bethel.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

This severe thunderstorm may contain little or no lightning. Do not
wait until you hear thunder before taking cover.

&&

LAT...LON 3846 7569 3869 7571 3884 7562 3884 7555
      3890 7549 3895 7530 3884 7518 3845 7542
TIME...MOT...LOC 1847Z 248DEG 32KT 3884 7557 3842 7583 

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

Iovino

1 follow-up statement

287 
WWUS51 KPHI 061915
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
215 PM EST TUE NOV 6 2018

DEC005-061930-
/O.CON.KPHI.SV.W.0110.000000T0000Z-181106T1930Z/
Sussex DE-
215 PM EST TUE NOV 6 2018

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 230 PM EST
FOR CENTRAL SUSSEX COUNTY...

At 215 PM EST, severe thunderstorms were located along a line
extending from near Big Stone Beach to near Delmar, moving east at 35
mph.

HAZARD...60 mph wind gusts.

SOURCE...Radar indicated.

IMPACT...Damage to roofs, siding, trees, and power lines is 
         possible.

Locations impacted include...
Georgetown, Laurel, Milton, Delmar and Sycamore. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

This severe thunderstorm may contain little or no lightning. Do not
wait until you hear thunder before taking cover.

&&

LAT...LON 3846 7563 3895 7530 3884 7518 3845 7542
TIME...MOT...LOC 1915Z 248DEG 32KT 3892 7531 3850 7557 

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

Iovino

The office that day

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

Issued	Product	Office	Counties	Lasted
Nov 6, 4:32 AM EST	Coastal Flood Advisory	PHI	Kent, New Castle	11 hr
Nov 6, 11:47 AM EST	Areal Flood Advisory	PHI	New Castle	2 hr
Nov 6, 12:13 PM EST	Special Weather Statement	PHI	Kent	62 min
Nov 6, 1:30 PM EST	Special Weather Statement	PHI	Sussex	60 min
Nov 6, 2:25 PM EST	Special Weather Statement	PHI	Sussex	65 min

Nearby

Severe Thunderstorm Warnings in Delaware, 2018 Every severe thunderstorm warning in 2018

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.