Alert archive / Delaware / Severe Thunderstorm Warnings in 2017
Severe Thunderstorm Warning 139, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Jul 25, 2017, 12:34 AM EDT for Caroline County, Maryland; Kent County, Sussex County, Delaware. It was in force for 41 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 25, 2017, 12:34 AM EDT (04:34 UTC)
- Expired
- Jul 25, 2017, 1:15 AM EDT
- In force
- 41 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, Caroline County, MD
The radar
The Dover AFB radar (KDOX), 24 km from the middle of the area, began a volume at 04:33 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, 4.6 hours before the alert went out and 80 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
- 161 J/kg
- Mixed-layer CIN
- -82 J/kg
- Mixed-layer LCL
- 1504 m above ground
- 0-6 km bulk shear
- 19 kt
- 0-1 km storm-relative helicity
- 40 m²/s²
- 0-3 km storm-relative helicity
- 51 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.2
The text
As transmitted.
644
WUUS51 KPHI 250434
SVRPHI
DEC001-005-MDC011-250515-
/O.NEW.KPHI.SV.W.0139.170725T0434Z-170725T0515Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mount Holly NJ
1234 AM EDT TUE JUL 25 2017
The National Weather Service in Mount Holly NJ has issued a
* Severe Thunderstorm Warning for...
Sussex County in southern Delaware...
Southern Kent County in central Delaware...
Southeastern Caroline County in eastern Maryland...
* Until 115 AM EDT
* At 1234 AM EDT, a severe thunderstorm was located near Bridgeville,
or 13 miles northeast of Hurlock, moving east at 30 mph.
HAZARD...60 mph wind gusts and penny size hail.
SOURCE...Radar indicated.
IMPACT...Expect damage to trees and power lines.
* Locations impacted include...
Georgetown, Seaford, Millsboro, Laurel, Lewes, Federalsburg,
Milton, Selbyville, Bridgeville, Dagsboro, Preston, Millville,
Ellendale, Henlopen Acres, Smithville, Gumboro, Agner, Sycamore,
Harmony and Long Neck.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
In addition to 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 this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.
&&
LAT...LON 3845 7550 3851 7570 3864 7571 3869 7577
3868 7580 3870 7580 3871 7584 3868 7593
3870 7594 3887 7581 3879 7521 3873 7505
3846 7504 3845 7505
TIME...MOT...LOC 0434Z 281DEG 25KT 3872 7566
HAIL...0.75IN
WIND...60MPH
$$
JRK2 follow-up statements
962
WWUS51 KPHI 250454
SVSPHI
Severe Weather Statement
National Weather Service Mount Holly NJ
1254 AM EDT TUE JUL 25 2017
DEC001-MDC011-250503-
/O.CAN.KPHI.SV.W.0139.000000T0000Z-170725T0515Z/
Kent DE-Caroline MD-
1254 AM EDT TUE JUL 25 2017
...THE SEVERE THUNDERSTORM WARNING FOR SOUTHERN KENT AND SOUTHEASTERN
CAROLINE COUNTIES IS CANCELLED...
The storms which prompted the warning have moved out of the warned
area. Therefore, the warning has been cancelled.
LAT...LON 3845 7552 3851 7570 3865 7571 3883 7548
3879 7521 3873 7505 3846 7504 3845 7505
TIME...MOT...LOC 0453Z 295DEG 22KT 3878 7543 3859 7558 3853 7575
$$
DEC005-250515-
/O.CON.KPHI.SV.W.0139.000000T0000Z-170725T0515Z/
Sussex DE-
1254 AM EDT TUE JUL 25 2017
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 115 AM EDT
FOR SUSSEX COUNTY...
At 1253 AM EDT, severe thunderstorms were located along a line
extending from near Ellendale to near Laurel to Sharptown, moving
southeast at 25 mph.
HAZARD...60 mph wind gusts.
SOURCE...Radar indicated.
IMPACT...Expect damage to trees and power lines.
Locations impacted include...
Georgetown, Seaford, Millsboro, Laurel, Lewes, Milton, Selbyville,
Bridgeville, Dagsboro, Millville, Ellendale, Henlopen Acres, Gumboro,
Sycamore, Long Neck, Ocean View, Blades, Frankford, South Bethany and
Dewey Beach.
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 7552 3851 7570 3865 7571 3883 7548
3879 7521 3873 7505 3846 7504 3845 7505
TIME...MOT...LOC 0453Z 295DEG 22KT 3878 7543 3859 7558 3853 7575
HAIL...<.75IN
WIND...60MPH
$$
JRK051
WWUS51 KPHI 250516
SVSPHI
Severe Weather Statement
National Weather Service Mount Holly NJ
116 AM EDT TUE JUL 25 2017
DEC005-250525-
/O.EXP.KPHI.SV.W.0139.000000T0000Z-170725T0515Z/
Sussex DE-
116 AM EDT TUE JUL 25 2017
...THE SEVERE THUNDERSTORM WARNING FOR SUSSEX COUNTY HAS EXPIRED...
The storms which prompted the warning have weakened below severe
limits, and no longer pose an immediate threat to life or property.
Therefore the warning has been allowed to expire. However, these
storms may try to re-intensify in far southeastern Delaware before
moving off the coast by 2 AM so be certain to monitor local radio
stations and available television stations for additional
information and possible warnings from the National Weather Service.
LAT...LON 3845 7552 3851 7570 3865 7571 3883 7548
3879 7521 3873 7505 3846 7504 3845 7505
TIME...MOT...LOC 0515Z 281DEG 25KT 3875 7525 3856 7540 3850 7557
$$
JRKThe office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 24, 8:08 PM EDT | Severe Thunderstorm Warning | PHI | Cecil | 52 min |
| Jul 24, 8:59 PM EDT | Areal Flood Advisory | PHI | Cecil | 2 hr |
| Jul 24, 9:52 PM EDT | Severe Thunderstorm Warning | PHI | Caroline, Kent, Queen Anne's | 38 min |
| Jul 24, 10:02 PM EDT | Special Weather Statement | PHI | Cecil | 43 min |
| Jul 24, 10:06 PM EDT | Severe Thunderstorm Warning | PHI | Caroline, Cecil, Kent, Queen Anne's | 39 min |
| Jul 24, 10:50 PM EDT | Severe Thunderstorm Warning | PHI | Caroline, Queen Anne's | 40 min |
| Jul 24, 11:10 PM EDT | Special Weather Statement | PHI | Talbot | 35 min |
| Jul 24, 11:30 PM EDT | Special Weather Statement | PHI | Caroline | 45 min |
| Jul 24, 11:55 PM EDT | Areal Flood Advisory | PHI | Caroline, Queen Anne's | 2 hr |
| Jul 24, 9:01 PM EDT | Special Weather Statement | PHI | New Castle | 59 min |
| Jul 24, 10:01 PM EDT | Areal Flood Advisory | PHI | New Castle | 119 min |
| Jul 24, 10:38 PM EDT | Severe Thunderstorm Warning | PHI | Kent, New Castle | 52 min |
| Jul 25, 12:16 AM EDT | Special Weather Statement | PHI | Sussex | 44 min |
| Jul 25, 1:15 AM EDT | Special Weather Statement | PHI | Sussex | 45 min |
| Jul 25, 3:25 PM EDT | Coastal Flood Advisory | PHI | Sussex | 11 hr |
Nearby
Severe Thunderstorm Warnings in Delaware, 2017Severe Thunderstorm Warnings in Maryland, 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.