Alert archive / Delaware / Severe Thunderstorm Warnings in 2015
Severe Thunderstorm Warning 53, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Jun 20, 2015, 10:32 PM EDT for Kent County, Sussex County, Delaware; Caroline County, Maryland. It was in force for 46 min. 2 reports came from inside the area while it was in force.
The area
The outline as issued, with what was reported inside it.
The facts
- Issued
- Jun 20, 2015, 10:32 PM EDT (02:32 UTC)
- Expired
- Jun 20, 2015, 11:18 PM EDT
- In force
- 46 min
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Storm-based polygon
Counties Kent County, DE, Sussex County, DE, Caroline County, MD
The radar
The Dover AFB radar (KDOX), 16 km from the middle of the area, began a volume at 02:31 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.
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Jun 20, 11:13 PM EDT | TSTM WND DMG | Georgetown, DE | TREE DOWN ON MORRIS MILL ROAD |
| Jun 20, 11:13 PM EDT | TSTM WND DMG | Georgetown, DE | WIRES DOWN ON BRIDGEVILLE ROAD |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
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 20, 8:56 PM EDT | Severe Thunderstorm Watch | SPC | 4 hr |
The nearest sounding before it
Wallops Is Stn, VA (KWAL), launched 00:00Z, 2.5 hours before the alert went out and 86 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
- 261 J/kg
- Mixed-layer CIN
- -134 J/kg
- Mixed-layer LCL
- 1179 m above ground
- 0-6 km bulk shear
- 28 kt
- 0-1 km storm-relative helicity
- 16 m²/s²
- 0-3 km storm-relative helicity
- 75 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.4
The text
As transmitted, in the capitals the NWS used until 2016.
748
WUUS51 KPHI 210232
SVRPHI
DEC001-005-MDC011-210330-
/O.NEW.KPHI.SV.W.0053.150621T0232Z-150621T0330Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
1032 PM EDT SAT JUN 20 2015
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...
CAROLINE COUNTY IN EASTERN MARYLAND...
* UNTIL 1130 PM EDT
* AT 1031 PM EDT...DOPPLER RADAR INDICATED A LINE OF SEVERE
THUNDERSTORMS CAPABLE OF PRODUCING DAMAGING WINDS IN EXCESS OF 60
MPH. THESE STORMS WERE LOCATED ALONG A LINE EXTENDING FROM NEAR
GRIFFIN TO NEAR HURLOCK TO 8 MILES SOUTH OF VIENNA...AND MOVING
NORTHEAST AT 35 MPH.
* LOCATIONS IMPACTED INCLUDE...
DOVER...GEORGETOWN...MILFORD...SEAFORD...DENTON...MILLSBORO...
LAUREL...HARRINGTON...CAMDEN...LEWES...FEDERALSBURG...MILTON...
SELBYVILLE...BRIDGEVILLE...GREENSBORO...RIDGELY...DELMAR...
DAGSBORO...MILLVILLE AND ELLENDALE.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
SEVERE THUNDERSTORMS PRODUCE DAMAGING WINDS...LARGE HAIL...DEADLY
LIGHTNING AND VERY HEAVY RAIN. FOR YOUR PROTECTION...MOVE TO AN
INTERIOR ROOM ON THE LOWEST FLOOR OF YOUR HOME OR BUSINESS. HEAVY
RAINS FLOOD ROADS QUICKLY SO DO NOT DRIVE INTO AREAS WHERE WATER
COVERS THE ROAD.
THESE STORMS HAVE A HISTORY OF PRODUCING WIND DAMAGE. THIS IS A VERY
DANGEROUS SITUATION. SEEK SHELTER NOW INSIDE A STURDY STRUCTURE AND
STAY AWAY FROM WINDOWS.
&&
LAT...LON 3846 7569 3865 7571 3870 7589 3895 7595
3896 7594 3918 7541 3891 7531 3879 7510
3880 7509 3869 7507 3868 7507 3869 7514
3864 7513 3862 7508 3866 7507 3861 7506
3859 7521 3860 7506 3845 7505
TIME...MOT...LOC 0231Z 246DEG 31KT 3890 7590 3866 7584 3837 7586
$$
AMC3 follow-up statements
807
WWUS51 KPHI 210253
SVSPHI
SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
1053 PM EDT SAT JUN 20 2015
DEC001-005-MDC011-210330-
/O.CON.KPHI.SV.W.0053.000000T0000Z-150621T0330Z/
SUSSEX DE-KENT DE-CAROLINE MD-
1053 PM EDT SAT JUN 20 2015
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1130 PM EDT
FOR SUSSEX...SOUTHERN KENT AND CAROLINE COUNTIES...
AT 1053 PM EDT...DOPPLER RADAR INDICATED A LINE OF SEVERE
THUNDERSTORMS CAPABLE OF PRODUCING DAMAGING WINDS IN EXCESS OF 60
MPH. THESE STORMS WERE LOCATED ALONG A LINE EXTENDING FROM NEAR
SANDTOWN TO NEAR BRIDGEVILLE TO NEAR DELMAR...MOVING NORTHEAST AT 40
MPH.
LOCATIONS IMPACTED INCLUDE...
DOVER...GEORGETOWN...MILFORD...SEAFORD...DENTON...MILLSBORO...
LAUREL...HARRINGTON...CAMDEN...LEWES...FEDERALSBURG...MILTON...
SELBYVILLE...BRIDGEVILLE...GREENSBORO...RIDGELY...DELMAR...
DAGSBORO...MILLVILLE AND ELLENDALE.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
SEVERE THUNDERSTORMS PRODUCE DAMAGING WINDS...DESTRUCTIVE HAIL...
DEADLY LIGHTNING AND VERY HEAVY RAIN. FOR YOUR PROTECTION MOVE TO AN
INTERIOR ROOM ON THE LOWEST FLOOR OF YOUR HOME OR BUSINESS. HEAVY
RAINS FLOOD ROADS QUICKLY SO DO NOT DRIVE INTO AREAS WHERE WATER
COVERS THE ROAD.
THESE STORMS HAVE A HISTORY OF PRODUCING WIND DAMAGE. THIS IS A VERY
DANGEROUS SITUATION. SEEK SHELTER NOW INSIDE A STURDY STRUCTURE AND
STAY AWAY FROM WINDOWS.
&&
LAT...LON 3846 7569 3865 7571 3870 7589 3895 7595
3896 7594 3918 7541 3891 7531 3879 7510
3880 7509 3869 7507 3868 7507 3869 7514
3864 7513 3862 7508 3866 7507 3861 7506
3859 7521 3860 7506 3845 7505
TIME...MOT...LOC 0253Z 235DEG 33KT 3903 7566 3879 7560 3850 7562
$$
SFJ569
WWUS51 KPHI 210304
SVSPHI
SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
1104 PM EDT SAT JUN 20 2015
MDC011-210312-
/O.CAN.KPHI.SV.W.0053.000000T0000Z-150621T0330Z/
CAROLINE MD-
1104 PM EDT SAT JUN 20 2015
...THE SEVERE THUNDERSTORM WARNING FOR CAROLINE COUNTY IS
CANCELLED...
THE STORMS WHICH PROMPTED THE WARNING HAVE MOVED OUT OF THE WARNED
AREA. THEREFORE THE WARNING HAS BEEN CANCELLED.
LAT...LON 3846 7569 3876 7569 3903 7571 3918 7541
3891 7531 3879 7510 3880 7509 3869 7507
3868 7507 3869 7514 3864 7513 3862 7508
3866 7507 3861 7506 3859 7521 3860 7506
3845 7505
TIME...MOT...LOC 0302Z 246DEG 31KT 3906 7558 3882 7552 3853 7554
$$
DEC001-005-210330-
/O.CON.KPHI.SV.W.0053.000000T0000Z-150621T0330Z/
SUSSEX DE-KENT DE-
1104 PM EDT SAT JUN 20 2015
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1130 PM EDT
FOR SUSSEX AND SOUTHERN KENT COUNTIES...
AT 1102 PM EDT...DOPPLER RADAR INDICATED A LINE OF SEVERE
THUNDERSTORMS CAPABLE OF PRODUCING DAMAGING WINDS IN EXCESS OF 60
MPH. THESE STORMS WERE LOCATED ALONG A LINE EXTENDING FROM WOODSIDE
TO NEAR ELLENDALE TO NEAR LAUREL...MOVING NORTHEAST AT 35 MPH.
LOCATIONS IMPACTED INCLUDE...
DOVER...GEORGETOWN...MILFORD...SEAFORD...MILLSBORO...LAUREL...
HARRINGTON...CAMDEN...LEWES...MILTON...SELBYVILLE...BRIDGEVILLE...
DELMAR...DAGSBORO...MILLVILLE...ELLENDALE...BOWERS...WOODSIDE...VIOLA
AND HENLOPEN ACRES.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
SEVERE THUNDERSTORMS PRODUCE DAMAGING WINDS...DESTRUCTIVE HAIL...
DEADLY LIGHTNING AND VERY HEAVY RAIN. FOR YOUR PROTECTION MOVE TO AN
INTERIOR ROOM ON THE LOWEST FLOOR OF YOUR HOME OR BUSINESS. HEAVY
RAINS FLOOD ROADS QUICKLY SO DO NOT DRIVE INTO AREAS WHERE WATER
COVERS THE ROAD.
THESE STORMS HAVE A HISTORY OF PRODUCING WIND DAMAGE. SEEK SHELTER
NOW INSIDE A STURDY STRUCTURE AND STAY AWAY FROM WINDOWS.
&&
LAT...LON 3846 7569 3876 7569 3903 7571 3918 7541
3891 7531 3879 7510 3880 7509 3869 7507
3868 7507 3869 7514 3864 7513 3862 7508
3866 7507 3861 7506 3859 7521 3860 7506
3845 7505
TIME...MOT...LOC 0302Z 246DEG 31KT 3906 7558 3882 7552 3853 7554
$$
AMC787
WWUS51 KPHI 210318
SVSPHI
SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
1118 PM EDT SAT JUN 20 2015
DEC001-005-210327-
/O.CAN.KPHI.SV.W.0053.000000T0000Z-150621T0330Z/
SUSSEX DE-KENT DE-
1118 PM EDT SAT JUN 20 2015
...THE SEVERE THUNDERSTORM WARNING FOR SUSSEX AND SOUTHERN KENT
COUNTIES IS CANCELLED...
THE STORMS WHICH PROMPTED THE WARNING HAVE WEAKENED BELOW SEVERE
LIMITS...AND NO LONGER POSES AN IMMEDIATE THREAT TO LIFE OR PROPERTY.
THEREFORE THE WARNING HAS BEEN CANCELLED.
LAT...LON 3846 7569 3876 7569 3903 7571 3918 7541
3891 7531 3879 7510 3880 7509 3869 7507
3868 7507 3869 7514 3864 7513 3862 7508
3866 7507 3861 7506 3859 7521 3860 7506
3845 7505
TIME...MOT...LOC 0315Z 246DEG 31KT 3911 7545 3887 7539 3858 7541
$$
AMCThe office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 20, 8:31 PM EDT | Special Weather Statement | PHI | Kent, New Castle, Sussex | 3 hr |
| Jun 21, 12:25 AM EDT | Special Weather Statement | PHI | Sussex | 35 min |
| Jun 21, 12:35 AM EDT | Severe Thunderstorm Warning | PHI | Sussex | 55 min |
| Jun 21, 12:47 AM EDT | Areal Flood Advisory | PHI | New Castle | 4 hr |
| Jun 21, 5:12 AM EDT | Areal Flood Advisory | PHI | Kent, New Castle, Sussex | 4 hr |
| Jun 20, 9:35 PM EDT | Severe Thunderstorm Warning | PHI | Caroline, Talbot | 55 min |
| Jun 20, 9:49 PM EDT | Severe Thunderstorm Warning | PHI | Cecil | 56 min |
| Jun 20, 9:57 PM EDT | Severe Thunderstorm Warning | PHI | Caroline, Kent, Queen Anne's | 63 min |
| Jun 21, 4:45 AM EDT | Special Weather Statement | PHI | Queen Anne's | 30 min |
Nearby
Severe Thunderstorm Warnings in Delaware, 2015Severe Thunderstorm Warnings in Maryland, 2015Every severe thunderstorm warning in 2015
Sources
The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.