Alert archive / Delaware / Severe Thunderstorm Warnings in 2018
Severe Thunderstorm Warning 72, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Aug 11, 2018, 6:08 PM EDT for Kent County, New Castle County, Delaware; Kent County, Queen Anne's County, Maryland. It was in force for 52 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
- Aug 11, 2018, 6:08 PM EDT (22:08 UTC)
- Expired
- Aug 11, 2018, 7:00 PM EDT
- In force
- 52 min
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Storm-based polygon
- Hail
- 1.0 in
- Wind
- 60.0 mph
Counties Kent County, DE, New Castle County, DE, Kent County, MD, Queen Anne's County, MD
The radar
The Dover AFB radar (KDOX), 62 km from the middle of the area, began a volume at 22:12 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
Washington/Dulle, VA (KIAD), launched 12:00Z, 10.1 hours before the alert went out and 122 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
- 963 J/kg
- Mixed-layer CIN
- -38 J/kg
- Mixed-layer LCL
- 1021 m above ground
- 0-6 km bulk shear
- 23 kt
- 0-1 km storm-relative helicity
- 59 m²/s²
- 0-3 km storm-relative helicity
- 57 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 1.6
The text
As transmitted.
703
WUUS51 KPHI 112208
SVRPHI
DEC001-003-MDC029-035-112300-
/O.NEW.KPHI.SV.W.0072.180811T2208Z-180811T2300Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mount Holly NJ
608 PM EDT SAT AUG 11 2018
The National Weather Service in Mount Holly NJ has issued a
* Severe Thunderstorm Warning for...
Southwestern New Castle County in northern Delaware...
Northern Kent County in central Delaware...
Central Queen Anne's County in northeastern Maryland...
Kent County in northeastern Maryland...
* Until 700 PM EDT.
* At 607 PM EDT, severe thunderstorms were located along a line
extending from near Hope Creek to Green Spring to near Millington
to near Bodkin Point, moving east at 15 mph.
HAZARD...60 mph wind gusts and quarter size hail.
SOURCE...Radar indicated.
IMPACT...Minor damage to vehicles is possible. Wind damage to
roofs, siding, trees, and power lines is possible.
* Severe thunderstorms will be near...
Clayton, Green Spring, Massey and Crumpton around 615 PM EDT.
Millington around 620 PM EDT.
Smyrna and Sudlersville around 625 PM EDT.
Delaney Corner around 635 PM EDT.
Dover and Woodland Beach around 650 PM EDT.
Langford around 655 PM EDT.
Centreville, Cheswold, Hartly, Overton and Old Town around 700 PM
EDT.
Other locations impacted by these severe thunderstorms include
Templeville, Kenton, Townsend, Barclay, Leipsic, Chambersville,
Kingstown and Odessa.
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 3904 7631 3903 7630 3903 7625 3905 7623
3909 7623 3915 7628 3922 7625 3937 7573
3943 7572 3948 7557 3927 7537 3924 7537
3914 7573 3901 7622 3902 7632
TIME...MOT...LOC 2207Z 292DEG 11KT 3942 7559 3934 7565 3928 7588 3914
7637
HAIL...1.00IN
WIND...60MPH
$$
JRK3 follow-up statements
197
WWUS51 KPHI 112231
SVSPHI
Severe Weather Statement
National Weather Service Mount Holly NJ
631 PM EDT SAT AUG 11 2018
DEC001-003-MDC029-035-112300-
/O.CON.KPHI.SV.W.0072.000000T0000Z-180811T2300Z/
New Castle DE-Kent DE-Queen Anne's MD-Kent MD-
631 PM EDT SAT AUG 11 2018
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 700 PM EDT
FOR SOUTH CENTRAL NEW CASTLE...NORTHERN KENT...NORTHEASTERN QUEEN
ANNE'S AND CENTRAL KENT COUNTIES...
At 630 PM EDT, severe thunderstorms were located along a line
extending from 6 miles south of Hope Creek to near Woodland Beach to
near Clayton to Langford, moving southeast at 10 mph.
HAZARD...60 mph wind gusts and nickel size hail.
SOURCE...Radar indicated.
IMPACT...Damage to roofs, siding, trees, and power lines is
possible.
These severe storms will be near...
Smyrna, Clayton and Green Spring around 635 PM EDT.
Woodland Beach around 650 PM EDT.
Dover, Centreville, Cheswold, Church Hill, Hartly, Starkey Corner
and Overton around 700 PM EDT.
Other locations impacted by these severe thunderstorms include
Templeville, Kenton, Barclay, Leipsic, Chambersville and Kingstown.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
In addition to hail and damaging winds, frequent cloud to ground
lightning is occurring with this storm. Move indoors immediately.
Remember, if you can hear thunder, you are close enough to be struck
by lightning.
Torrential rainfall is also occurring with these storms, and may
lead to flash flooding. Do not drive your vehicle through flooded
roadways.
&&
LAT...LON 3921 7624 3932 7575 3941 7558 3945 7555
3927 7537 3924 7537 3901 7620 3902 7621
3909 7623 3916 7627
TIME...MOT...LOC 2230Z 328DEG 11KT 3938 7552 3935 7554 3928 7568 3917
7616
HAIL...0.88IN
WIND...60MPH
$$
JRK398
WWUS51 KPHI 112244
SVSPHI
Severe Weather Statement
National Weather Service Mount Holly NJ
644 PM EDT SAT AUG 11 2018
DEC003-112254-
/O.CAN.KPHI.SV.W.0072.000000T0000Z-180811T2300Z/
New Castle DE-
644 PM EDT SAT AUG 11 2018
...THE SEVERE THUNDERSTORM WARNING FOR SOUTH CENTRAL NEW CASTLE
COUNTY IS CANCELLED...
The storms which prompted the warning have moved out of the warned
area. Therefore, the warning has been cancelled.
LAT...LON 3921 7617 3928 7582 3927 7569 3931 7562
3931 7558 3935 7556 3939 7549 3927 7537
3924 7537 3913 7579 3911 7582 3901 7618
3902 7621 3915 7626
TIME...MOT...LOC 2244Z 312DEG 11KT 3930 7551 3922 7567 3922 7582 3914
7610
$$
DEC001-MDC029-035-112300-
/O.CON.KPHI.SV.W.0072.000000T0000Z-180811T2300Z/
Kent DE-Queen Anne's MD-Kent MD-
644 PM EDT SAT AUG 11 2018
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 700 PM EDT
FOR NORTHERN KENT...NORTHEASTERN QUEEN ANNE'S AND SOUTHERN KENT
COUNTIES...
At 644 PM EDT, severe thunderstorms were located along a line
extending from near Woodland Beach to near Hartly to near Millington
to Old Town, moving southeast at 10 mph.
HAZARD...60 mph wind gusts and penny size hail.
SOURCE...Radar indicated.
IMPACT...Damage to roofs, siding, trees, and power lines is
possible.
These severe storms will be near...
Smyrna, Clayton, Hartly and Woodland Beach around 650 PM EDT.
Dover and Cheswold around 700 PM EDT.
Other locations impacted by these severe thunderstorms include
Kenton, Barclay, Leipsic, Kingstown and Templeville.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
In addition to hail and damaging winds, frequent cloud to ground
lightning is occurring with this storm. Move indoors immediately.
Remember, if you can hear thunder, you are close enough to be struck
by lightning.
Torrential rainfall is also occurring with these storms, and may
lead to flash flooding. Do not drive your vehicle through flooded
roadways.
&&
LAT...LON 3921 7617 3928 7582 3927 7569 3931 7562
3931 7558 3935 7556 3939 7549 3927 7537
3924 7537 3913 7579 3911 7582 3901 7618
3902 7621 3915 7626
TIME...MOT...LOC 2244Z 312DEG 11KT 3930 7551 3922 7567 3922 7582 3914
7610
HAIL...0.75IN
WIND...60MPH
$$
JRK634
WWUS51 KPHI 112257
SVSPHI
Severe Weather Statement
National Weather Service Mount Holly NJ
657 PM EDT SAT AUG 11 2018
DEC001-MDC029-035-112306-
/O.EXP.KPHI.SV.W.0072.000000T0000Z-180811T2300Z/
Kent DE-Queen Anne's MD-Kent MD-
657 PM EDT SAT AUG 11 2018
...THE SEVERE THUNDERSTORM WARNING FOR NORTHERN KENT...NORTHEASTERN
QUEEN ANNE'S AND SOUTHERN KENT COUNTIES WILL EXPIRE AT 700 PM EDT...
The storms which prompted the warning have moved out of the area.
Therefore, the warning will be allowed to expire. However gusty
winds and heavy rain are still possible with these thunderstorms.
Remember, a Severe Thunderstorm Warning still remains in effect
farther south and east for portions of Queen Anne's County in
Maryland and Kent County in Delaware until 745 PM.
LAT...LON 3921 7617 3928 7582 3927 7569 3931 7562
3931 7558 3935 7556 3939 7549 3927 7537
3924 7537 3913 7579 3911 7582 3901 7618
3902 7621 3915 7626
TIME...MOT...LOC 2256Z 292DEG 11KT 3929 7547 3921 7563 3921 7578 3913
7606
$$
JRKThe office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 11, 3:24 AM EDT | Flash Flood Watch | PHI | Kent, New Castle | 20 hr |
| Aug 11, 4:26 AM EDT | Coastal Flood Advisory | PHI | Kent, New Castle, Sussex | 24 hr |
| Aug 11, 1:23 PM EDT | Severe Thunderstorm Warning | PHI | Sussex | 37 min |
| Aug 11, 4:19 PM EDT | Areal Flood Advisory | PHI | New Castle | 3 hr |
| Aug 11, 4:19 PM EDT | Severe Thunderstorm Warning | PHI | New Castle | 29 min |
| Aug 11, 5:20 PM EDT | Areal Flood Advisory | PHI | Kent, New Castle | 4 hr |
| Aug 11, 6:12 PM EDT | Flash Flood Warning | PHI | Kent, New Castle | 3 hr |
| Aug 11, 6:45 PM EDT | Flash Flood Warning | PHI | Kent | 5 hr |
| Aug 11, 6:55 PM EDT | Severe Thunderstorm Warning | PHI | Kent | 50 min |
| Aug 11, 7:42 PM EDT | Special Weather Statement | PHI | Kent | 48 min |
| Aug 11, 5:24 PM EDT | Special Weather Statement | PHI | Cecil | 36 min |
Nearby
Severe Thunderstorm Warnings in Delaware, 2018Severe Thunderstorm Warnings in Maryland, 2018Every severe thunderstorm warning in 2018
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.