Alert archive / Delaware / Severe Thunderstorm Warnings in 2019

Severe Thunderstorm Warning 126, NWS Philadelphia/Mount Holly

June 5, 2019Sussex County, Delaware

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Jun 5, 2019, 4:15 PM EDT for Sussex County, Delaware. It was in force for 45 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 5, 2019, 4:15 PM EDT (20:15 UTC)
Expired: Jun 5, 2019, 5:00 PM EDT
In force: 45 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), 29 km from the middle of the area, began a volume at 20:17 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 5, 4:56 PM EDT	TSTM WND DMG	Millsboro, DE	REPORT OF POWER LINES DOWN IN THE MILLSBORO AREA. TIME AND LOCATION APPROXIMATED FROM RADAR.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Wallops Is Stn, VA (KWAL), launched 12:00Z, 8.3 hours before the alert went out and 73 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: 280 J/kg
Mixed-layer CIN: -87 J/kg
Mixed-layer LCL: 841 m above ground
0-6 km bulk shear: 34 kt
0-1 km storm-relative helicity: 119 m²/s²
0-3 km storm-relative helicity: 118 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.6

Open this sounding in Storm Lab

The text

As transmitted.

827 
WUUS51 KPHI 052015
SVRPHI
DEC005-052100-
/O.NEW.KPHI.SV.W.0126.190605T2015Z-190605T2100Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mount Holly NJ
415 PM EDT Wed Jun 5 2019

The National Weather Service in Mount Holly NJ has issued a

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

* Until 500 PM EDT.

* At 413 PM EDT, severe thunderstorms were located along a line
  extending from Vienna to near Hebron to 8 miles northeast of Deal
  Island, moving northeast at 40 mph.

  HAZARD...60 mph wind gusts.

  SOURCE...Radar indicated.

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

* Locations impacted include...
  Georgetown, Seaford, Millsboro, Laurel, Milton, Delmar, Sycamore,
  Gumboro, Blades and Bethel.

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 these storms. Move indoors
immediately. Remember, if you can hear thunder, you are close enough
to be struck by lightning.

&&

LAT...LON 3846 7569 3849 7570 3862 7570 3884 7531
      3871 7524 3845 7531
TIME...MOT...LOC 2013Z 232DEG 39KT 3848 7583 3841 7577 3825 7585 

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

Robertson

2 follow-up statements

008 
WWUS51 KPHI 052039
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
439 PM EDT Wed Jun 5 2019

DEC005-052100-
/O.CON.KPHI.SV.W.0126.000000T0000Z-190605T2100Z/
Sussex DE-
439 PM EDT Wed Jun 5 2019

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 500 PM EDT
FOR SOUTHWESTERN SUSSEX COUNTY...

At 438 PM EDT, severe thunderstorms were located along a line
extending from 6 miles west of Georgetown to Sycamore to near Delmar,
moving northeast at 45 mph.

HAZARD...60 mph wind gusts.

SOURCE...Radar indicated.

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

Locations impacted include...
Georgetown, Seaford, Millsboro, Laurel, Milton, Delmar, Sycamore,
Gumboro, Blades and Bethel.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3846 7566 3846 7567 3854 7564 3867 7562
      3884 7531 3871 7524 3845 7531
TIME...MOT...LOC 2038Z 231DEG 39KT 3868 7550 3858 7549 3842 7553 

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

CMS

884 
WWUS51 KPHI 052055
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
455 PM EDT Wed Jun 5 2019

DEC005-052102-
/O.EXP.KPHI.SV.W.0126.000000T0000Z-190605T2100Z/
Sussex DE-
455 PM EDT Wed Jun 5 2019

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHWESTERN SUSSEX COUNTY
WILL EXPIRE AT 500 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 are still possible with these thunderstorms.

LAT...LON 3846 7566 3846 7567 3854 7564 3867 7562
      3884 7531 3871 7524 3845 7531
TIME...MOT...LOC 2052Z 232DEG 39KT 3877 7536 3867 7535 3851 7539 

$$

Robertson

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 5, 5:00 PM EDT	Special Weather Statement	PHI	Sussex	45 min

Nearby

Severe Thunderstorm Warnings in Delaware, 2019 Every severe thunderstorm warning in 2019

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.