Alert archive / Delaware / Severe Thunderstorm Warnings in 2017
Severe Thunderstorm Warning 34, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at May 25, 2017, 7:56 PM EDT for Kent County, New Castle County, Delaware; Cumberland County, Salem County, New Jersey; Cecil County, Kent County, Maryland. It was in force for 49 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
- May 25, 2017, 7:56 PM EDT (23:56 UTC)
- Expired
- May 25, 2017, 8:45 PM EDT
- In force
- 49 min
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Storm-based polygon
- Hail
- 0.75 in
- Wind
- 60.0 mph
Counties Kent County, DE, New Castle County, DE, Cecil County, MD, Kent County, MD, Cumberland County, NJ, Salem County, NJ
The radar
The Dover AFB radar (KDOX), 62 km from the middle of the area, began a volume at 23:55 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, 11.9 hours before the alert went out and 162 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
- 492 J/kg
- Mixed-layer CIN
- -9 J/kg
- Mixed-layer LCL
- 478 m above ground
- 0-6 km bulk shear
- 64 kt
- 0-1 km storm-relative helicity
- 206 m²/s²
- 0-3 km storm-relative helicity
- 170 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 1.5
The text
As transmitted.
957
WUUS51 KPHI 252356
SVRPHI
DEC001-003-MDC015-029-NJC011-033-260045-
/O.NEW.KPHI.SV.W.0034.170525T2356Z-170526T0045Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mount Holly NJ
756 PM EDT THU MAY 25 2017
The National Weather Service in Mount Holly NJ has issued a
* Severe Thunderstorm Warning for...
New Castle County in northern Delaware...
Northern Kent County in central Delaware...
Northeastern Kent County in northeastern Maryland...
Southeastern Cecil County in northeastern Maryland...
Northwestern Cumberland County in southern New Jersey...
Salem County in southern New Jersey...
* Until 845 PM EDT
* At 756 PM EDT, severe thunderstorms were located along a line
extending from Sassafras to Smyrna to near Dover Speedway, moving
northeast at 25 mph.
HAZARD...60 mph wind gusts and penny size hail.
SOURCE...Radar indicated.
IMPACT...Expect damage to trees and power lines.
* Locations impacted include...
Wilmington, Vineland, Dover, Newark, Millville, Bridgeton,
Middletown, Pennsville, Smyrna, Carneys Point, Elsmere, New Castle,
Salem, Woodstown, Alloway, Clayton, Quinton, Delaware City,
Cheswold and Newport.
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 3947 7582 3976 7569 3962 7526 3947 7500
3925 7529 3937 7545 3939 7549 3927 7537
3919 7537 3915 7542 3923 7565 3934 7586
TIME...MOT...LOC 2356Z 217DEG 23KT 3937 7580 3928 7560 3920 7545
HAIL...0.75IN
WIND...60MPH
$$
JRK3 follow-up statements
351
WWUS51 KPHI 260011
SVSPHI
(
WWUS51 KPHI 000000
SVSPHI
Severe Weather Statement
National Weather Service Mount Holly NJ
811 PM EDT THU MAY 25 2017
MDC029-260020-
/O.CAN.KPHI.SV.W.0034.000000T0000Z-170526T0045Z/
Kent MD-
811 PM EDT THU MAY 25 2017
...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN KENT COUNTY IS
CANCELLED...
The storms which prompted the warning have moved out of the warned
area. Therefore, the warning has been cancelled.
LAT...LON 3976 7569 3962 7526 3947 7500 3925 7529
3939 7549 3927 7537 3922 7537 3929 7558
3941 7584
TIME...MOT...LOC 0010Z 217DEG 23KT 3943 7575 3934 7555 3926 7540
$$
DEC001-003-MDC015-NJC011-033-260045-
/O.CON.KPHI.SV.W.0034.000000T0000Z-170526T0045Z/
New Castle DE-Kent DE-Cecil MD-Cumberland NJ-Salem NJ-
811 PM EDT THU MAY 25 2017
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 845 PM EDT
FOR NEW CASTLE...NORTHEASTERN KENT...SOUTHEASTERN CECIL...
NORTHWESTERN CUMBERLAND AND SALEM COUNTIES...
At 810 PM EDT, severe thunderstorms were located along a line
extending from Warwick to near Woodland Beach to 8 miles northeast of
Dover Speedway, moving northeast at 25 mph.
HAZARD...60 mph wind gusts and penny size hail.
SOURCE...Radar indicated.
IMPACT...Expect damage to trees and power lines.
Locations impacted include...
Wilmington, Vineland, Millville, Bridgeton, Middletown, Pennsville,
Smyrna, Carneys Point, Elsmere, New Castle, Salem, Woodstown,
Alloway, Quinton, Delaware City, Newport, Greenwich, Shiloh, Warwick
and Stanton.
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 3976 7569 3962 7526 3947 7500 3925 7529
3939 7549 3927 7537 3922 7537 3929 7558
3941 7584
TIME...MOT...LOC 0010Z 217DEG 23KT 3943 7575 3934 7555 3926 7540
HAIL...0.75IN
WIND...60MPH
$$
JRK458
WWUS51 KPHI 260028
SVSPHI
Severe Weather Statement
National Weather Service Mount Holly NJ
828 PM EDT THU MAY 25 2017
DEC001-MDC015-260037-
/O.CAN.KPHI.SV.W.0034.000000T0000Z-170526T0045Z/
Kent DE-Cecil MD-
828 PM EDT THU MAY 25 2017
...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN KENT AND
SOUTHEASTERN CECIL COUNTIES IS CANCELLED...
The storms which prompted the warning have moved out of
the warned area. Therefore, the warning has been cancelled.
LAT...LON 3976 7569 3964 7531 3956 7515 3947 7501
3925 7529 3939 7548 3934 7545 3945 7563
3956 7578
TIME...MOT...LOC 0027Z 214DEG 21KT 3958 7572 3940 7550 3935 7536
$$
DEC003-NJC011-033-260045-
/O.CON.KPHI.SV.W.0034.000000T0000Z-170526T0045Z/
New Castle DE-Cumberland NJ-Salem NJ-
828 PM EDT THU MAY 25 2017
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 845 PM EDT
FOR WESTERN NEW CASTLE...NORTHWESTERN CUMBERLAND AND SALEM
COUNTIES...
At 827 PM EDT, severe thunderstorms were located along a line
extending from Glasgow to near Woodland Beach to near Greenwich,
moving northeast at 25 mph.
HAZARD...60 mph wind gusts.
SOURCE...Radar indicated.
IMPACT...Expect damage to trees and power lines.
Locations impacted include...
Wilmington, Vineland, Newark, Millville, Bridgeton, Pennsville,
Carneys Point, Elsmere, New Castle, Salem, Woodstown, Alloway,
Quinton, Delaware City, Newport, Greenwich, Shiloh, Stanton, Glasgow
and Bear.
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 3976 7569 3964 7531 3956 7515 3947 7501
3925 7529 3939 7548 3934 7545 3945 7563
3956 7578
TIME...MOT...LOC 0027Z 214DEG 21KT 3958 7572 3940 7550 3935 7536
HAIL...<.75IN
WIND...60MPH
$$
JRK678
WWUS51 KPHI 260040
SVSPHI
Severe Weather Statement
National Weather Service Mount Holly NJ
840 PM EDT THU MAY 25 2017
DEC003-NJC011-033-260049-
/O.EXP.KPHI.SV.W.0034.000000T0000Z-170526T0045Z/
New Castle DE-Cumberland NJ-Salem NJ-
840 PM EDT THU MAY 25 2017
...THE SEVERE THUNDERSTORM WARNING FOR WESTERN NEW CASTLE...
NORTHWESTERN CUMBERLAND AND SALEM COUNTIES WILL EXPIRE AT 845 PM
EDT...
The storms which prompted the warning have weakened below severe
limits, and no longer pose an immediate threat to life or property.
Therefore the warning will be allowed to expire. However gusty winds
and heavy rain are still possible with these thunderstorms.
LAT...LON 3976 7569 3964 7531 3956 7515 3947 7501
3925 7529 3939 7548 3934 7545 3945 7563
3956 7578
TIME...MOT...LOC 0039Z 217DEG 23KT 3964 7566 3946 7544 3941 7530
$$
JRKThe office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 25, 5:29 PM EDT | Areal Flood Advisory | PHI | Kent, New Castle | 2 hr |
| May 25, 6:26 PM EDT | Severe Thunderstorm Warning | PHI | Kent, Sussex | 49 min |
| May 25, 6:48 PM EDT | Special Weather Statement | PHI | Sussex | 27 min |
| May 25, 7:13 PM EDT | Special Weather Statement | PHI | Kent | 32 min |
| May 25, 7:49 PM EDT | Special Weather Statement | PHI | New Castle | 26 min |
| May 25, 5:12 PM EDT | Special Marine Warning | PHI | 63 min | |
| May 25, 5:15 PM EDT | Special Weather Statement | PHI | Cumberland | 30 min |
| May 25, 5:51 PM EDT | Special Weather Statement | PHI | Salem | 24 min |
| May 25, 6:16 PM EDT | Special Weather Statement | PHI | Gloucester | 29 min |
| May 25, 7:37 PM EDT | Special Marine Warning | PHI | 38 min | |
| May 25, 7:50 PM EDT | Special Marine Warning | PHI | 55 min | |
| May 25, 5:48 PM EDT | Severe Thunderstorm Warning | PHI | Queen Anne's, Talbot | 42 min |
| May 25, 7:09 PM EDT | Severe Thunderstorm Warning | PHI | Cecil, Kent, Queen Anne's | 51 min |
Nearby
Severe Thunderstorm Warnings in Delaware, 2017Severe Thunderstorm Warnings in New Jersey, 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.