Alert archive / Delaware / Severe Thunderstorm Warnings in 2019

Severe Thunderstorm Warning 396, NWS Philadelphia/Mount Holly

September 12, 2019Sussex County, Delaware

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Sep 12, 2019, 5:51 PM EDT for Sussex County, Delaware. It was in force for 24 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: Sep 12, 2019, 5:51 PM EDT (21:51 UTC)
Expired: Sep 12, 2019, 6:15 PM EDT
In force: 24 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

County Sussex County, DE

What was reported inside it

Time	Report	Where	Remark
Sep 12, 5:51 PM EDT	HAIL 1	1 W Millsboro, DE	QUARTER SIZE HAIL FELL FOR ABOUT 10 MINUTES.

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, 9.9 hours before the alert went out and 66 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: 862 J/kg
Mixed-layer CIN: -149 J/kg
Mixed-layer LCL: 1246 m above ground
0-6 km bulk shear: 24 kt
0-1 km storm-relative helicity: 76 m²/s²
0-3 km storm-relative helicity: 71 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.3

Open this sounding in Storm Lab

The text

As transmitted.

414 
WUUS51 KPHI 122151
SVRPHI
DEC005-122215-
/O.NEW.KPHI.SV.W.0396.190912T2151Z-190912T2215Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mount Holly NJ
551 PM EDT Thu Sep 12 2019

The National Weather Service in Mount Holly NJ has issued a

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

* Until 615 PM EDT.

* At 550 PM EDT, a severe thunderstorm was located over Millsboro, or
  7 miles southeast of Georgetown, moving south at 15 mph.

  HAZARD...60 mph wind gusts.

  SOURCE...Radar indicated.

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

* Locations impacted include...
  Millsboro, Selbyville, Dagsboro, Gumboro and Frankford. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

To report severe weather, contact your nearest law enforcement
agency. They will send your report to the National Weather Service
office in Mount Holly NJ.

&&

LAT...LON 3845 7541 3862 7541 3864 7527 3845 7517
TIME...MOT...LOC 2150Z 345DEG 14KT 3859 7534 

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

MPS

2 follow-up statements

570 
WWUS51 KPHI 122202
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
602 PM EDT Thu Sep 12 2019

DEC005-122215-
/O.CON.KPHI.SV.W.0396.000000T0000Z-190912T2215Z/
Sussex DE-
602 PM EDT Thu Sep 12 2019

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 615 PM EDT
FOR SOUTH CENTRAL SUSSEX COUNTY...

At 602 PM EDT, a severe thunderstorm was located near Gumboro, or 13
miles south of Georgetown, moving southeast at 25 mph.

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

SOURCE...Radar indicated.

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

Locations impacted include...
Millsboro, Selbyville, Dagsboro, Gumboro and Frankford. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

To report severe weather contact your nearest law enforcement agency.
They will send your report to the National Weather Service office in
Mount Holly NJ.

&&

LAT...LON 3853 7541 3859 7525 3845 7517 3845 7539
TIME...MOT...LOC 2202Z 334DEG 23KT 3850 7530 

HAIL...0.88IN
WIND...60MPH
 
$$

MPS

615 
WWUS51 KPHI 122209
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
609 PM EDT Thu Sep 12 2019

DEC005-122219-
/O.EXP.KPHI.SV.W.0396.000000T0000Z-190912T2215Z/
Sussex DE-
609 PM EDT Thu Sep 12 2019

...THE SEVERE THUNDERSTORM WARNING FOR SOUTH CENTRAL SUSSEX COUNTY
WILL EXPIRE AT 615 PM EDT...
                
The storm which prompted the warning has weakened below severe
limits, and no longer poses an immediate threat to life or property.
Therefore, the warning will be allowed to expire.  However small
hail, gusty winds and heavy rain are still possible with this
thunderstorm.

To report severe weather, contact your nearest law enforcement
agency. They will relay your report to the National Weather Service
Mount Holly NJ.

LAT...LON 3853 7541 3859 7525 3845 7517 3845 7539
TIME...MOT...LOC 2209Z 345DEG 14KT 3848 7529 

$$

MPS

The office that day

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

Issued	Product	Office	Counties	Lasted
Sep 12, 5:46 PM EDT	Special Weather Statement	PHI	Sussex	29 min
Sep 12, 7:35 PM EDT	Special Weather Statement	PHI	Sussex	25 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.