Alert archive / Delaware / Severe Thunderstorm Warnings in 2017
Severe Thunderstorm Warning 58, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Jun 19, 2017, 8:24 PM EDT for Kent County, Sussex County, Delaware. It was in force for 36 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
- Jun 19, 2017, 8:24 PM EDT (00:24 UTC)
- Expired
- Jun 19, 2017, 9:00 PM EDT
- In force
- 36 min
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Storm-based polygon
- Hail
- 0.75 in
- Wind
- 60.0 mph
Counties Kent County, DE, Sussex County, DE
The radar
The Dover AFB radar (KDOX), 13 km from the middle of the area, began a volume at 00:24 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, 0.4 hours before the alert went out and 92 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.
- Mixed-layer CAPE
- 1394 J/kg
- Mixed-layer CIN
- -55 J/kg
- Mixed-layer LCL
- 1009 m above ground
- 0-6 km bulk shear
- 41 kt
- 0-1 km storm-relative helicity
- 162 m²/s²
- 0-3 km storm-relative helicity
- 157 m²/s²
- Significant tornado parameter
- 1.2
- Supercell composite
- 8.5
The text
As transmitted.
671
WUUS51 KPHI 200024
SVRPHI
DEC001-005-200100-
/O.NEW.KPHI.SV.W.0058.170620T0024Z-170620T0100Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mount Holly NJ
824 PM EDT MON JUN 19 2017
The National Weather Service in Mount Holly NJ has issued a
* Severe Thunderstorm Warning for...
Western Sussex County in southern Delaware...
South central Kent County in central Delaware...
* Until 900 PM EDT
* At 823 PM EDT, severe thunderstorms were located along a line
extending from near Hurlock to Sharptown, moving northeast at 55
mph.
HAZARD...60 mph wind gusts.
SOURCE...Radar indicated.
IMPACT...Expect damage to trees and power lines.
* Severe thunderstorms will be near,
Seaford and Laurel around 835 PM EDT.
Bridgeville around 840 PM EDT.
Georgetown around 845 PM EDT.
Ellendale around 850 PM EDT.
Milton around 855 PM EDT.
Other locations impacted by these severe thunderstorms include
Bethel, Farmington, Blades and Greenwood.
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 this storm. Move indoors
immediately. Remember...if you can hear thunder...you are close
enough to be struck by lightning.
Torrential rainfall is occurring with these storms, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.
&&
LAT...LON 3877 7572 3890 7556 3886 7538 3875 7529
3846 7569
TIME...MOT...LOC 0023Z 229DEG 50KT 3860 7589 3857 7579 3853 7575
HAIL...<.75IN
WIND...60MPH
$$
Drag2 follow-up statements
489
WWUS51 KPHI 200043
SVSPHI
Severe Weather Statement
National Weather Service Mount Holly NJ
843 PM EDT MON JUN 19 2017
DEC001-005-200100-
/O.CON.KPHI.SV.W.0058.000000T0000Z-170620T0100Z/
Sussex DE-Kent DE-
843 PM EDT MON JUN 19 2017
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 900 PM EDT
FOR NORTHWESTERN SUSSEX AND SOUTH CENTRAL KENT COUNTIES...
At 842 PM EDT, severe thunderstorms were located along a line
extending from near Smithville to near Bridgeville to near Seaford,
moving northeast at 50 mph.
HAZARD...60 mph wind gusts.
SOURCE...Radar indicated.
IMPACT...Expect damage to trees and power lines.
These severe storms will be near...
Georgetown around 850 PM EDT.
Ellendale around 855 PM EDT.
Milton around 900 PM EDT.
Other locations impacted by these severe thunderstorms include
Bethel, Farmington, Blades and Greenwood.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
In addition to large hail and damaging winds...frequent cloud to
ground lightning is occurring with this storm. Move indoors
immediately. Remember...if you can hear thunder...you are close
enough to be struck by lightning.
Torrential rainfall is occurring with these storms, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.
&&
LAT...LON 3877 7572 3890 7556 3886 7538 3875 7529
3852 7569
TIME...MOT...LOC 0042Z 226DEG 44KT 3879 7565 3873 7555 3871 7556
HAIL...<.75IN
WIND...60MPH
$$
Drag551
WWUS51 KPHI 200053
SVSPHI
Severe Weather Statement
National Weather Service Mount Holly NJ
853 PM EDT MON JUN 19 2017
DEC001-005-200102-
/O.EXP.KPHI.SV.W.0058.000000T0000Z-170620T0100Z/
Sussex DE-Kent DE-
853 PM EDT MON JUN 19 2017
...THE SEVERE THUNDERSTORM WARNING FOR NORTHWESTERN SUSSEX AND SOUTH
CENTRAL KENT COUNTIES WILL EXPIRE AT 900 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.
LAT...LON 3877 7572 3890 7556 3886 7538 3875 7529
3852 7569
TIME...MOT...LOC 0052Z 229DEG 50KT 3887 7553 3881 7543 3879 7544
$$
DragThe office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 19, 8:12 PM EDT | Special Weather Statement | PHI | Sussex | 48 min |
| Jun 19, 8:20 PM EDT | Flash Flood Warning | PHI | Sussex | 3 hr |
| Jun 19, 8:32 PM EDT | Areal Flood Advisory | PHI | Kent, Sussex | 3 hr |
| Jun 19, 8:45 PM EDT | Special Weather Statement | PHI | Sussex | 30 min |
Nearby
Severe Thunderstorm Warnings in Delaware, 2017Every 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.