Alert archive / Delaware / Severe Thunderstorm Warnings in 2017
Severe Thunderstorm Warning 114, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Jul 22, 2017, 3:17 PM EDT for Sussex County, Delaware. It was in force for 43 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
- Jul 22, 2017, 3:17 PM EDT (19:17 UTC)
- Expired
- Jul 22, 2017, 4:00 PM EDT
- In force
- 43 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), 40 km from the middle of the area, began a volume at 19:21 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 12:00Z, 7.3 hours before the alert went out and 69 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
- 83 J/kg
- Mixed-layer CIN
- -191 J/kg
- Mixed-layer LCL
- 1397 m above ground
- 0-6 km bulk shear
- 16 kt
- 0-1 km storm-relative helicity
- 66 m²/s²
- 0-3 km storm-relative helicity
- 76 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
525
WUUS51 KPHI 221917
SVRPHI
DEC005-222000-
/O.NEW.KPHI.SV.W.0114.170722T1917Z-170722T2000Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mount Holly NJ
317 PM EDT SAT JUL 22 2017
The National Weather Service in Mount Holly NJ has issued a
* Severe Thunderstorm Warning for...
Southeastern Sussex County in southern Delaware...
* Until 400 PM EDT
* At 317 PM EDT, a severe thunderstorm was located over Selbyville,
or 11 miles northwest of Ocean City, moving southeast at 25 mph.
HAZARD...60 mph wind gusts.
SOURCE...Radar indicated.
IMPACT...Expect damage to trees and power lines.
* Locations impacted include...
Millsboro, Selbyville, Dagsboro, Millville, Long Neck, Ocean View,
Frankford and South Bethany.
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 3864 7533 3861 7504 3845 7504 3846 7505
3845 7505 3845 7537
TIME...MOT...LOC 1917Z 294DEG 20KT 3849 7521
HAIL...<.75IN
WIND...60MPH
$$
JRK2 follow-up statements
414
WWUS51 KPHI 221941
SVSPHI
Severe Weather Statement
National Weather Service Mount Holly NJ
341 PM EDT SAT JUL 22 2017
DEC005-222000-
/O.CON.KPHI.SV.W.0114.000000T0000Z-170722T2000Z/
Sussex DE-
341 PM EDT SAT JUL 22 2017
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 400 PM EDT
FOR SOUTHEASTERN SUSSEX COUNTY...
At 341 PM EDT, severe thunderstorms were located along a line
extending from near Millville to near Selbyville, moving east at 15
mph.
HAZARD...60 mph wind gusts.
SOURCE...Radar indicated.
IMPACT...Expect damage to trees and power lines.
Locations impacted include...
Selbyville, Millville, Long Neck, Ocean View, Frankford and South
Bethany.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
Frequent cloud to ground lightning is occurring with this storm...and
the storm will affect the beaches. For your safety...immediately move
off the beach and seek shelter indoors.
Torrential rainfall is occurring with these storms, and may lead to
flooding. Do not drive your vehicle through flooded roadways.
&&
LAT...LON 3850 7529 3854 7519 3857 7519 3863 7523
3861 7504 3845 7504 3846 7505 3845 7505
3845 7527 3846 7527
TIME...MOT...LOC 1941Z 271DEG 13KT 3861 7515 3846 7518
HAIL...<.75IN
WIND...60MPH
$$
JRK186
WWUS51 KPHI 221958
SVSPHI
Severe Weather Statement
National Weather Service Mount Holly NJ
358 PM EDT SAT JUL 22 2017
DEC005-222008-
/O.EXP.KPHI.SV.W.0114.000000T0000Z-170722T2000Z/
Sussex DE-
358 PM EDT SAT JUL 22 2017
...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN SUSSEX COUNTY
WILL EXPIRE AT 400 PM EDT...
The storms which prompted the warning have weakened below severe
limits and have exited the warned area. Therefore the warning will
be allowed to expire. However gusty winds and heavy rain are still
possible with these thunderstorms.
LAT...LON 3850 7529 3854 7519 3857 7519 3863 7523
3861 7504 3845 7504 3846 7505 3845 7505
3845 7527 3846 7527
TIME...MOT...LOC 1958Z 294DEG 20KT 3857 7505 3842 7508
$$
JRKThe office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 22, 10:45 AM EDT | Coastal Flood Advisory | PHI | Kent, Sussex | 13 hr |
| Jul 22, 2:58 PM EDT | Special Weather Statement | PHI | Sussex | 62 min |
| Jul 22, 3:34 PM EDT | Special Weather Statement | PHI | Sussex | 41 min |
| Jul 22, 3:36 PM EDT | Areal Flood Advisory | PHI | Sussex | 114 min |
| Jul 22, 3:38 PM EDT | Severe Thunderstorm Warning | PHI | Sussex | 52 min |
| Jul 22, 3:57 PM EDT | Special Weather Statement | PHI | Sussex | 33 min |
| Jul 22, 5:18 PM EDT | Severe Thunderstorm Warning | PHI | New Castle | 42 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.