Alert archive / Delaware / Severe Thunderstorm Warnings in 2017
Severe Thunderstorm Warning 57, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Jun 19, 2017, 7:30 PM EDT for Sussex County, Delaware. It was in force for 45 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, 7:30 PM EDT (23:30 UTC)
- Expired
- Jun 19, 2017, 8:15 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), 33 km from the middle of the area, began a volume at 23:30 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 watch it was issued in
The SPC watch in force over the same counties when this warning went out.
| Issued | Product | Office | Lasted |
|---|---|---|---|
| Jun 19, 11:13 AM EDT | Severe Thunderstorm Watch | SPC | 9 hr |
The nearest sounding before it
Wallops Is Stn, VA (KWAL), launched 12:00Z, 11.5 hours before the alert went out and 70 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
- 419 J/kg
- Mixed-layer CIN
- -126 J/kg
- Mixed-layer LCL
- 1020 m above ground
- 0-6 km bulk shear
- 35 kt
- 0-1 km storm-relative helicity
- 85 m²/s²
- 0-3 km storm-relative helicity
- 97 m²/s²
- Significant tornado parameter
- 0.1
- Supercell composite
- 0.8
The text
As transmitted.
197
WUUS51 KPHI 192330
SVRPHI
DEC005-200015-
/O.NEW.KPHI.SV.W.0057.170619T2330Z-170620T0015Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mount Holly NJ
730 PM EDT MON JUN 19 2017
The National Weather Service in Mount Holly NJ has issued a
* Severe Thunderstorm Warning for...
Southeastern Sussex County in southern Delaware...
* Until 815 PM EDT
* At 729 PM EDT, severe thunderstorms were located along a line
extending from Gumboro to 6 miles north of Millville, moving east
at 15 mph.
HAZARD...60 mph wind gusts.
SOURCE...Radar indicated.
IMPACT...Expect damage to trees and power lines.
* Severe thunderstorms will be near,
Henlopen Acres around 755 PM EDT.
Millville around 815 PM EDT.
Other locations impacted by these severe thunderstorms include Long
Neck, Dewey Beach, Ocean View, South Bethany and Frankford.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
In addition to 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 3845 7549 3846 7549 3879 7514 3879 7506
3849 7504 3845 7534
TIME...MOT...LOC 2329Z 250DEG 14KT 3849 7539 3864 7516
HAIL...<.75IN
WIND...60MPH
$$
Drag1 follow-up statement
068
WWUS51 KPHI 192351
SVSPHI
Severe Weather Statement
National Weather Service Mount Holly NJ
751 PM EDT MON JUN 19 2017
DEC005-200015-
/O.CON.KPHI.SV.W.0057.000000T0000Z-170620T0015Z/
Sussex DE-
751 PM EDT MON JUN 19 2017
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 815 PM EDT
FOR SOUTHEASTERN SUSSEX COUNTY...
At 750 PM EDT, severe thunderstorms were located along a line
extending from Gumboro to 6 miles south of Henlopen Acres, moving
east at 5 mph.
HAZARD...Isolated 60 mph wind gusts.
SOURCE...Radar indicated.
IMPACT...Expect isolated damage to trees and power lines.
These severe storms will be near...
Millville around 755 PM EDT.
Henlopen Acres around 810 PM EDT.
Other locations impacted by these severe thunderstorms include Long
Neck, Dewey Beach, Ocean View, South Bethany and Frankford.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
Frequent cloud to ground lightning is occurring with this storm...and
the storm will affect the beaches. For your safety...immediately move
off the beach and seek shelter indoors.
Torrential rainfall is occurring with these storms, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.
&&
LAT...LON 3845 7545 3863 7529 3879 7506 3849 7504
3845 7534
TIME...MOT...LOC 2350Z 272DEG 6KT 3849 7535 3864 7512
HAIL...<.75IN
WIND...60MPH
$$
DragThe office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 19, 4:07 PM EDT | Severe Thunderstorm Warning | PHI | New Castle | 38 min |
| Jun 19, 4:07 PM EDT | Severe Thunderstorm Warning | PHI | New Castle | 38 min |
| Jun 19, 4:34 PM EDT | Severe Thunderstorm Warning | PHI | New Castle | 41 min |
| Jun 19, 4:38 PM EDT | Severe Thunderstorm Warning | PHI | Kent, New Castle | 52 min |
| Jun 19, 4:42 PM EDT | Areal Flood Advisory | PHI | New Castle | 3 hr |
| Jun 19, 4:59 PM EDT | Severe Thunderstorm Warning | PHI | Kent, Sussex | 46 min |
| Jun 19, 5:14 PM EDT | Areal Flood Advisory | PHI | Kent, New Castle, Sussex | 3 hr |
| Jun 19, 5:28 PM EDT | Severe Thunderstorm Warning | PHI | Kent, New Castle | 62 min |
| Jun 19, 5:38 PM EDT | Severe Thunderstorm Warning | PHI | Kent, Sussex | 67 min |
| Jun 19, 6:17 PM EDT | Tornado Warning | PHI | Kent, Sussex | 16 min |
| Jun 19, 6:52 PM EDT | Special Weather Statement | PHI | Sussex | 23 min |
| Jun 19, 7:34 PM EDT | Areal Flood Advisory | PHI | Sussex | 3 hr |
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.