Alert archive / Delaware / Severe Thunderstorm Warnings in 2018
Severe Thunderstorm Warning 92, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Aug 31, 2018, 1:09 PM EDT for Sussex County, Delaware. It was in force for 51 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 31, 2018, 1:09 PM EDT (17:09 UTC)
- Expired
- Aug 31, 2018, 2:00 PM EDT
- In force
- 51 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), 10 km from the middle of the area, began a volume at 17:08 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, 5.2 hours before the alert went out and 95 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
- 72 J/kg
- Mixed-layer CIN
- -177 J/kg
- Mixed-layer LCL
- 1245 m above ground
- 0-6 km bulk shear
- 23 kt
- 0-1 km storm-relative helicity
- 15 m²/s²
- 0-3 km storm-relative helicity
- 89 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- -0.0
The text
As transmitted.
653
WUUS51 KPHI 311709
SVRPHI
DEC005-311800-
/O.NEW.KPHI.SV.W.0092.180831T1709Z-180831T1800Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mount Holly NJ
109 PM EDT FRI AUG 31 2018
The National Weather Service in Mount Holly NJ has issued a
* Severe Thunderstorm Warning for...
Central Sussex County in southern Delaware...
* Until 200 PM EDT.
* At 108 PM EDT, a severe thunderstorm was located over Ellendale, or
8 miles northwest of Georgetown, moving south 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.
* Locations impacted include...
Georgetown, Milford, Seaford, Lewes, Milton, Bridgeville,
Ellendale, Cape Henlopen State Park and Blades.
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 with rainfall rates over 4 inches per hour is
occurring with this storm, and will likely lead to flash flooding.
Do not drive your vehicle through flooded roadways.
&&
LAT...LON 3877 7560 3889 7550 3890 7539 3887 7530
3889 7523 3881 7514 3881 7506 3875 7505
3871 7522 3862 7533 3862 7565
TIME...MOT...LOC 1708Z 339DEG 9KT 3880 7547
HAIL...0.75IN
WIND...60MPH
$$
Klein3 follow-up statements
000
WWUS51 KPHI 311728
SVSPHI
Severe Weather Statement
National Weather Service Mount Holly NJ
128 PM EDT FRI AUG 31 2018
DEC005-311800-
/O.CON.KPHI.SV.W.0092.000000T0000Z-180831T1800Z/
Sussex DE-
128 PM EDT FRI AUG 31 2018
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 200 PM EDT
FOR CENTRAL SUSSEX COUNTY...
At 127 PM EDT, a severe thunderstorm was located over Ellendale, or
near Georgetown, moving southeast at 10 mph.
HAZARD...60 mph wind gusts and penny size hail.
SOURCE...Radar indicated.
IMPACT...Damage to roofs, siding, trees, and power lines is
possible.
This severe storm will be near...
Milton around 145 PM EDT.
Georgetown around 200 PM EDT.
Other locations impacted by this severe thunderstorm include Blades.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
In addition to large hail and damaging winds, frequent cloud to
ground lightning is occurring with this storm. Move indoors
immediately. Remember, if you can hear thunder, you are close enough
to be struck by lightning.
Torrential rainfall with rainfall rates over 4 inches per hour is
occurring with this storm, and will likely lead to flash flooding.
Do not drive your vehicle through flooded roadways.
&&
LAT...LON 3879 7559 3883 7555 3884 7551 3888 7547
3888 7540 3886 7528 3889 7524 3881 7514
3881 7506 3875 7505 3871 7522 3862 7533
3862 7565
TIME...MOT...LOC 1727Z 332DEG 7KT 3878 7543
HAIL...0.75IN
WIND...60MPH
$$
Klein006
WWUS51 KPHI 311750
SVSPHI
Severe Weather Statement
National Weather Service Mount Holly NJ
150 PM EDT FRI AUG 31 2018
DEC005-311800-
/O.CON.KPHI.SV.W.0092.000000T0000Z-180831T1800Z/
Sussex DE-
150 PM EDT FRI AUG 31 2018
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 200 PM EDT
FOR CENTRAL SUSSEX COUNTY...
At 149 PM EDT, a severe thunderstorm was located near Ellendale, or
near Georgetown, moving south at 10 mph.
HAZARD...60 mph wind gusts.
SOURCE...Radar indicated.
IMPACT...Damage to roofs, siding, trees, and power lines is
possible.
This severe storm will be near...
Milton around 155 PM EDT.
Georgetown around 200 PM EDT.
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 with rainfall rates near 4 inches per hour is
occurring with this storm, and will likely lead to flash flooding.
Do not drive your vehicle through flooded roadways.
&&
LAT...LON 3864 7559 3881 7551 3885 7534 3887 7531
3886 7527 3889 7524 3887 7521 3881 7518
3868 7526 3862 7532
TIME...MOT...LOC 1749Z 338DEG 8KT 3876 7542
HAIL...<.75IN
WIND...60MPH
$$
JRK094
WWUS51 KPHI 311759
SVSPHI
Severe Weather Statement
National Weather Service Mount Holly NJ
159 PM EDT FRI AUG 31 2018
DEC005-311809-
/O.EXP.KPHI.SV.W.0092.000000T0000Z-180831T1800Z/
Sussex DE-
159 PM EDT FRI AUG 31 2018
...THE SEVERE THUNDERSTORM WARNING FOR CENTRAL SUSSEX COUNTY WILL
EXPIRE AT 200 PM EDT...
The storm which prompted the warning has weakened below severe
limits, and no longer poses an immediate threat to life or property.
Therefore, the warning will be allowed to expire. However gusty
winds and heavy rain are still possible with this thunderstorm.
To report severe weather, contact your nearest law enforcement
agency. They will relay your report to the National Weather Service
in Mount Holly NJ.
LAT...LON 3864 7559 3881 7551 3885 7534 3887 7531
3886 7527 3889 7524 3887 7521 3881 7518
3868 7526 3862 7532
TIME...MOT...LOC 1759Z 339DEG 9KT 3874 7541
$$
JRKThe office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 31, 1:37 AM EDT | Special Weather Statement | PHI | Sussex | 53 min |
| Aug 31, 10:57 AM EDT | Areal Flood Advisory | PHI | Kent | 107 min |
| Aug 31, 11:31 AM EDT | Flash Flood Warning | PHI | Kent | 11 hr |
| Aug 31, 11:53 AM EDT | Special Weather Statement | PHI | Kent | 37 min |
| Aug 31, 12:00 PM EDT | Severe Thunderstorm Warning | PHI | Kent | 15 min |
| Aug 31, 12:15 PM EDT | Flash Flood Warning | PHI | Kent, Sussex | 7 hr |
| Aug 31, 12:28 PM EDT | Special Weather Statement | PHI | Kent | 32 min |
| Aug 31, 12:35 PM EDT | Severe Thunderstorm Warning | PHI | Kent, Sussex | 40 min |
| Aug 31, 12:54 PM EDT | Flash Flood Warning | PHI | Sussex | 4 hr |
| Aug 31, 1:58 PM EDT | Special Weather Statement | PHI | Sussex | 32 min |
| Aug 31, 4:27 PM EDT | Special Weather Statement | PHI | Sussex | 18 min |
| Aug 31, 4:32 PM EDT | Flash Flood Warning | PHI | Sussex | 4 hr |
| Aug 31, 4:41 PM EDT | Areal Flood Advisory | PHI | Kent, New Castle | 4 hr |
| Aug 31, 4:42 PM EDT | Special Weather Statement | PHI | Sussex | 33 min |
| Aug 31, 5:00 PM EDT | Flash Flood Warning | PHI | New Castle | 4 hr |
| Aug 31, 5:14 PM EDT | Special Weather Statement | PHI | Sussex | 46 min |
| Aug 31, 5:38 PM EDT | Areal Flood Advisory | PHI | Kent, New Castle, Sussex | 4 hr |
| Aug 31, 5:48 PM EDT | Flash Flood Warning | PHI | Sussex | 3 hr |
| Aug 31, 7:11 PM EDT | Areal Flood Warning | PHI | Kent, Sussex | 4 hr |
| Aug 31, 7:37 PM EDT | Flash Flood Warning | PHI | Kent, New Castle | 4 hr |
Nearby
Severe Thunderstorm Warnings in Delaware, 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.