Alert archive / Maryland / Severe Thunderstorm Warnings in 2018
Severe Thunderstorm Warning 30, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Jun 9, 2018, 3:53 PM EDT for Kent County, Queen Anne's County, Maryland; Kent County, New Castle County, Delaware. It was in force for 37 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
- Jun 9, 2018, 3:53 PM EDT (19:53 UTC)
- Expired
- Jun 9, 2018, 4:30 PM EDT
- In force
- 37 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, Kent County, MD, Queen Anne's County, MD
The radar
The Dover AFB radar (KDOX), 56 km from the middle of the area, began a volume at 19:53 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, 7.9 hours before the alert went out and 148 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
- 384 J/kg
- Mixed-layer CIN
- -76 J/kg
- Mixed-layer LCL
- 1106 m above ground
- 0-6 km bulk shear
- 19 kt
- 0-1 km storm-relative helicity
- 2 m²/s²
- 0-3 km storm-relative helicity
- 40 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.2
The text
As transmitted.
429
WUUS51 KPHI 091953
SVRPHI
DEC001-003-MDC029-035-092030-
/O.NEW.KPHI.SV.W.0030.180609T1953Z-180609T2030Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mount Holly NJ
353 PM EDT SAT JUN 9 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...
Northeastern Queen Anne's County in northeastern Maryland...
Northeastern Kent County in northeastern Maryland...
* Until 430 PM EDT.
* At 351 PM EDT, a severe thunderstorm was located over Green Spring,
or 10 miles southeast of Middletown, moving southeast at 15 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...
Dover, Smyrna, Camden, Clayton, Cheswold, Millington, Sudlersville,
Hartly, Rising Sun-Lebanon, Woodland Beach, Hazlettville, Morgnec,
Delaney Corner, Dover Base Housing, Crumpton, Dover Speedway,
Sassafras, Green Spring, Rising Sun and Massey.
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 3936 7591 3938 7577 3940 7577 3942 7569
3937 7546 3936 7546 3927 7537 3906 7537
3913 7575 3914 7575 3913 7579 3914 7587
3928 7605 3936 7605
TIME...MOT...LOC 1951Z 304DEG 11KT 3931 7564
HAIL...0.75IN
WIND...60MPH
$$
JRK2 follow-up statements
313
WWUS51 KPHI 092009
SVSPHI
Severe Weather Statement
National Weather Service Mount Holly NJ
409 PM EDT SAT JUN 9 2018
DEC001-003-MDC029-035-092030-
/O.CON.KPHI.SV.W.0030.000000T0000Z-180609T2030Z/
New Castle DE-Kent DE-Queen Anne's MD-Kent MD-
409 PM EDT SAT JUN 9 2018
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 430 PM EDT
FOR SOUTHWESTERN NEW CASTLE...NORTHERN KENT...NORTHEASTERN QUEEN
ANNE'S AND NORTHEASTERN KENT COUNTIES...
At 408 PM EDT, a severe thunderstorm was located over Cheswold, or
near Dover, moving southeast at 20 mph.
HAZARD...60 mph wind gusts and penny size hail.
SOURCE...Radar indicated.
IMPACT...Damage to roofs, siding, trees, and power lines is
possible.
Locations impacted include...
Dover, Smyrna, Camden, Clayton, Cheswold, Millington, Sudlersville,
Hartly, Rising Sun-Lebanon, Woodland Beach, Hazlettville, Morgnec,
Delaney Corner, Dover Base Housing, Crumpton, Dover Speedway, Green
Spring, Rising Sun, Massey and Kennedyville.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
In addition to hail and damaging winds, frequent cloud to ground
lightning is occurring with this storm. Move indoors immediately.
Remember, if you can hear thunder, you are close enough to be struck
by lightning.
Torrential rainfall is occurring with this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.
&&
LAT...LON 3934 7589 3936 7564 3934 7544 3927 7537
3906 7537 3913 7575 3914 7575 3913 7579
3914 7587 3928 7605 3936 7605
TIME...MOT...LOC 2008Z 315DEG 16KT 3924 7560
HAIL...0.75IN
WIND...60MPH
$$
JRK712
WWUS51 KPHI 092025
SVSPHI
Severe Weather Statement
National Weather Service Mount Holly NJ
425 PM EDT SAT JUN 9 2018
DEC001-003-MDC029-035-092035-
/O.EXP.KPHI.SV.W.0030.000000T0000Z-180609T2030Z/
New Castle DE-Kent DE-Queen Anne's MD-Kent MD-
425 PM EDT SAT JUN 9 2018
...THE SEVERE THUNDERSTORM WARNING FOR SOUTHWESTERN NEW CASTLE...
NORTHERN KENT...NORTHEASTERN QUEEN ANNE'S AND NORTHEASTERN KENT
COUNTIES WILL EXPIRE AT 430 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.
LAT...LON 3934 7589 3936 7564 3934 7544 3927 7537
3906 7537 3913 7575 3914 7575 3913 7579
3914 7587 3928 7605 3936 7605
TIME...MOT...LOC 2025Z 304DEG 11KT 3921 7555
$$
JRKThe office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 9, 1:21 PM EDT | Severe Thunderstorm Warning | PHI | Caroline, Queen Anne's | 39 min |
| Jun 9, 2:00 PM EDT | Special Weather Statement | PHI | Caroline | 30 min |
| Jun 9, 2:24 PM EDT | Severe Thunderstorm Warning | PHI | Caroline | 51 min |
| Jun 9, 2:42 PM EDT | Areal Flood Advisory | PHI | Caroline | 58 min |
| Jun 9, 4:24 PM EDT | Special Weather Statement | PHI | Kent | 51 min |
| Jun 9, 5:31 PM EDT | Special Weather Statement | PHI | Caroline | 44 min |
| Jun 9, 12:51 PM EDT | Special Weather Statement | PHI | Sussex | 24 min |
| Jun 9, 1:04 PM EDT | Special Weather Statement | PHI | Kent | 56 min |
| Jun 9, 1:25 PM EDT | Flash Flood Warning | PHI | Sussex | 4 hr |
| Jun 9, 1:35 PM EDT | Areal Flood Advisory | PHI | Kent | 71 min |
| Jun 9, 1:35 PM EDT | Special Weather Statement | PHI | Sussex | 25 min |
| Jun 9, 2:48 PM EDT | Severe Thunderstorm Warning | PHI | Sussex | 42 min |
| Jun 9, 2:53 PM EDT | Flash Flood Warning | PHI | Sussex | 4 hr |
| Jun 9, 3:06 PM EDT | Special Weather Statement | PHI | New Castle | 24 min |
| Jun 9, 3:26 PM EDT | Special Weather Statement | PHI | Sussex | 34 min |
| Jun 9, 3:45 PM EDT | Special Weather Statement | PHI | Kent | 45 min |
| Jun 9, 3:47 PM EDT | Areal Flood Advisory | PHI | Kent, New Castle | 3 hr |
| Jun 9, 4:06 PM EDT | Special Weather Statement | PHI | Sussex | 39 min |
| Jun 9, 4:15 PM EDT | Flash Flood Warning | PHI | Sussex | 3 hr |
| Jun 9, 4:20 PM EDT | Flash Flood Warning | PHI | Kent | 3 hr |
| Jun 9, 5:44 PM EDT | Areal Flood Warning | PHI | Sussex | 4 hr |
| Jun 9, 6:44 PM EDT | Areal Flood Warning | PHI | Sussex | 3 hr |
Nearby
Severe Thunderstorm Warnings in Maryland, 2018Severe 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.