Alert archive / Delaware / Severe Thunderstorm Warnings in 2019

Severe Thunderstorm Warning 361, NWS Philadelphia/Mount Holly

August 19, 2019Sussex County, Delaware

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Aug 19, 2019, 1:56 PM EDT for Sussex County, Delaware. It was in force for 49 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: Aug 19, 2019, 1:56 PM EDT (17:56 UTC)
Expired: Aug 19, 2019, 2:45 PM EDT
In force: 49 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

County Sussex County, DE

The radar

The Dover AFB radar (KDOX), 34 km from the middle of the area, began a volume at 17:57 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
Aug 19, 1:56 PM EDT	HAIL 1.25	1 Nw Dewey Beach, DE	CORRECTS PREVIOUS HAIL REPORT FROM 1 NW DEWEY BEACH.
Aug 19, 1:57 PM EDT	TSTM WND DMG	Lewes, DE	SEVERAL SOCIAL MEDIA REPORTS OF DOWNED TREES ACROSS TOWN. TIME BASED ON SOCIAL MEDIA REPORTS AND 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, 5.9 hours before the alert went out and 82 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: 1552 J/kg
Mixed-layer CIN: -43 J/kg
Mixed-layer LCL: 1081 m above ground
0-6 km bulk shear: 17 kt
0-1 km storm-relative helicity: 54 m²/s²
0-3 km storm-relative helicity: 48 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

244 
WUUS51 KPHI 191756
SVRPHI
DEC005-191845-
/O.NEW.KPHI.SV.W.0361.190819T1756Z-190819T1845Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mount Holly NJ
156 PM EDT Mon Aug 19 2019

The National Weather Service in Mount Holly NJ has issued a

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

* Until 245 PM EDT.

* At 156 PM EDT, severe thunderstorms were located along a line
  extending from Lewes to near Ocean Pines, moving east at 20 mph.

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

  SOURCE...Radar indicated.

  IMPACT...Minor damage to vehicles is possible. Wind damage to 
           roofs, siding, trees, and power lines is possible.

* Locations impacted include...
  Lewes, Millville, Henlopen Acres, Long Neck, Ocean View, South
  Bethany and Dewey Beach.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Frequent cloud to ground lightning is occurring with this storm, and
the storm will affect the beaches. For your safety, immediately move
off the beach and seek shelter indoors.

&&

LAT...LON 3859 7520 3857 7518 3858 7515 3860 7520
      3880 7518 3878 7512 3880 7510 3867 7507
      3869 7508 3869 7514 3864 7513 3862 7508
      3866 7507 3845 7505 3845 7520
TIME...MOT...LOC 1756Z 273DEG 19KT 3878 7511 3846 7512 

HAIL...1.00IN
WIND...60MPH
 
$$

Davis

2 follow-up statements

480 
WWUS51 KPHI 191829
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
229 PM EDT Mon Aug 19 2019

DEC005-191845-
/O.CON.KPHI.SV.W.0361.000000T0000Z-190819T1845Z/
Sussex DE-
229 PM EDT Mon Aug 19 2019

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 245 PM EDT
FOR SOUTHEASTERN SUSSEX COUNTY...

At 227 PM EDT, severe thunderstorms were located along a line
extending from 9 miles east of Cape Henlopen State Park to 10 miles
northeast of Ocean City, moving east at 20 mph.

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

SOURCE...Reports of wind gusts near 60 mph at Dewey Beach.

IMPACT...Minor damage to vehicles is possible. Wind damage to roofs, 
         siding, trees, and power lines is possible.

Locations impacted include...
Lewes, Millville, Henlopen Acres, Long Neck, Ocean View, South
Bethany and Dewey Beach.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Frequent cloud to ground lightning is occurring with this storm, and
the storm will affect the beaches. For your safety, immediately move
off the beach and seek shelter indoors.

&&

LAT...LON 3859 7520 3857 7518 3858 7515 3860 7520
      3880 7518 3878 7512 3880 7510 3867 7507
      3869 7508 3869 7514 3864 7513 3862 7508
      3866 7507 3845 7505 3845 7520
TIME...MOT...LOC 1827Z 273DEG 19KT 3877 7492 3845 7493 

HAIL...1.00IN
WIND...60MPH
 
$$

Davis

550 
WWUS51 KPHI 191842
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
242 PM EDT Mon Aug 19 2019

DEC005-191851-
/O.EXP.KPHI.SV.W.0361.000000T0000Z-190819T1845Z/
Sussex DE-
242 PM EDT Mon Aug 19 2019

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN SUSSEX COUNTY
WILL EXPIRE AT 245 PM EDT...
    
The storms which prompted the warning have moved out of the area.
Therefore, the warning will be allowed to expire.  However small hail
and gusty winds are still possible with these thunderstorms.

LAT...LON 3859 7520 3857 7518 3858 7515 3860 7520
      3880 7518 3878 7512 3880 7510 3867 7507
      3869 7508 3869 7514 3864 7513 3862 7508
      3866 7507 3845 7505 3845 7520
TIME...MOT...LOC 1841Z 273DEG 19KT 3877 7483 3845 7485 

$$

Davis

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 19, 12:57 PM EDT	Special Weather Statement	PHI	Sussex	48 min
Aug 19, 1:43 PM EDT	Special Weather Statement	PHI	Sussex	47 min
Aug 19, 2:39 PM EDT	Areal Flood Advisory	PHI	Sussex	2 hr
Aug 19, 3:00 PM EDT	Severe Thunderstorm Warning	PHI	Sussex	45 min
Aug 19, 3:28 PM EDT	Flash Flood Warning	PHI	Sussex	3 hr
Aug 19, 4:40 PM EDT	Special Weather Statement	PHI	Sussex	50 min
Aug 19, 4:41 PM EDT	Special Weather Statement	PHI	Kent	49 min
Aug 19, 4:46 PM EDT	Severe Thunderstorm Warning	PHI	Sussex	46 min
Aug 19, 4:52 PM EDT	Areal Flood Advisory	PHI	Sussex	68 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.