Alert archive / Maryland / Severe Thunderstorm Warnings in 2018
Severe Thunderstorm Warning 10, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at May 12, 2018, 8:11 PM EDT for Kent County, New Castle County, Delaware; 4 counties in Maryland. It was in force for 49 min. 9 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
- May 12, 2018, 8:11 PM EDT (00:11 UTC)
- Expired
- May 12, 2018, 9:00 PM EDT
- In force
- 49 min
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Storm-based polygon
- Hail
- 2.0 in
- Wind
- 60.0 mph
Counties Kent County, DE, New Castle County, DE, Caroline County, MD, Cecil County, MD, Kent County, MD, Queen Anne's County, MD
The radar
The Dover AFB radar (KDOX), 59 km from the middle of the area, began a volume at 00:10 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 |
|---|---|---|---|
| May 12, 8:12 PM EDT | HAIL 1 | 2 Ese Lambson, MD | PHOTO OF QUARTER SIZED HAIL SOUTH OF GALENA. LOCATION AND TIME APPROXIMATED BASED ON RADAR. |
| May 12, 8:22 PM EDT | HAIL 1.75 | Butlertown, MD | GOLF BALL SIZED HAIL REPORTED FOR SEVERAL MINUTES NORTH OF CHESTERTOWN. TIME APPROXIMATED FROM RADAR. |
| May 12, 8:27 PM EDT | TSTM WND DMG | Reba L Anthony Estates, MD | DOWNED TREE BLOCKED ROAD NEAR INTERSECTION OF MD-213 AND RIVERVIEW RD |
| May 12, 8:35 PM EDT | HAIL 1.75 | Chestertown, MD | |
| May 12, 8:36 PM EDT | TSTM WND DMG | 1 Se Centreville, MD | NUMEROUS BRANCHES AND GUTTERS DOWN FROM SEVERAL HOUSES. |
| May 12, 8:46 PM EDT | TSTM WND DMG | Camden, DE | TREES AND WIRES DOWN IN CAMDEN. TIME APPROXIMATED FROM RADAR. |
| May 12, 8:47 PM EDT | HAIL 1.25 | Wyoming, DE | |
| May 12, 8:52 PM EDT | HAIL 1 | Highland Acres, DE | PHOTO OF QUARTER SIZED HAIL IN HIGHLAND ACRES. TIME APPROXIMATED FROM RADAR. |
| May 12, 8:56 PM EDT | HAIL 1.5 | 1 Nne White House Landi, DE |
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 |
|---|---|---|---|
| May 12, 4:58 PM EDT | Tornado Watch | SPC | 5 hr |
The nearest sounding before it
Washington/Dulle, VA (KIAD), launched 00:00Z, 0.2 hours before the alert went out and 134 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
- 1175 J/kg
- Mixed-layer CIN
- -44 J/kg
- Mixed-layer LCL
- 2284 m above ground
- 0-6 km bulk shear
- 45 kt
- 0-1 km storm-relative helicity
- 132 m²/s²
- 0-3 km storm-relative helicity
- 130 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 2.4
The text
As transmitted.
139
WUUS51 KPHI 130011
SVRPHI
DEC001-003-MDC011-015-029-035-130100-
/O.NEW.KPHI.SV.W.0010.180513T0011Z-180513T0100Z/
BULLETIN - EAS ACTIVATION REQUESTED
Severe Thunderstorm Warning
National Weather Service Mount Holly NJ
811 PM EDT SAT MAY 12 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...
Queen Anne's County in northeastern Maryland...
Northeastern Caroline County in eastern Maryland...
Kent County in northeastern Maryland...
Southeastern Cecil County in northeastern Maryland...
* Until 900 PM EDT.
* At 811 PM EDT, severe thunderstorms were located along a line
extending from near Millington to near Dundalk, moving east at 35
mph.
HAZARD...Two inch hail and 60 mph wind gusts.
SOURCE...Radar indicated.
IMPACT...People and animals outdoors will be injured. Expect hail
damage to roofs, siding, windows, and vehicles. Wind
damage to roofs, siding, trees, and power lines is
possible.
* Locations impacted include...
Dover, Centerville, Smyrna, Chestertown, Centreville, Camden,
Clayton, Cheswold, Rock Hall, Church Hill, Millington,
Sudlersville, Betterton, Goldsboro, Woodside, Hartly, Old Town,
Hazlettville, Morgnec and Delaney Corner.
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.
&&
A tornado watch remains in effect until 100 AM EDT for central and
northern Delaware...and eastern and northeastern Maryland.
LAT...LON 3926 7622 3929 7617 3932 7618 3933 7614
3937 7611 3937 7606 3941 7603 3934 7543
3932 7542 3933 7539 3931 7541 3928 7538
3908 7537 3906 7562 3901 7581 3901 7600
3904 7624 3909 7623 3917 7628
TIME...MOT...LOC 0011Z 270DEG 29KT 3929 7589 3926 7655
HAIL...2.00IN
WIND...60MPH
$$
JRK1 follow-up statement
322
WWUS51 KPHI 130031
SVSPHI
Severe Weather Statement
National Weather Service Mount Holly NJ
831 PM EDT SAT MAY 12 2018
DEC001-003-MDC011-015-029-035-130100-
/O.CON.KPHI.SV.W.0010.000000T0000Z-180513T0100Z/
New Castle DE-Kent DE-Queen Anne's MD-Caroline MD-Kent MD-Cecil MD-
831 PM EDT SAT MAY 12 2018
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 900 PM EDT
FOR SOUTHWESTERN NEW CASTLE...NORTHERN KENT...QUEEN ANNE'S...
NORTHEASTERN CAROLINE...KENT AND SOUTHEASTERN CECIL COUNTIES...
At 830 PM EDT, severe thunderstorms were located along a line
extending from near Delaney Corner to near Bowleys Quarters, moving
east at 35 mph.
HAZARD...60 mph wind gusts and half dollar size hail.
SOURCE...Radar indicated.
IMPACT...Minor damage to vehicles is possible. Wind damage to roofs,
siding, trees, and power lines is possible.
Locations impacted include...
Dover, Centerville, Smyrna, Chestertown, Centreville, Camden,
Clayton, Cheswold, Rock Hall, Church Hill, Millington, Sudlersville,
Betterton, Goldsboro, Woodside, Hartly, Old Town, Hazlettville,
Morgnec and Delaney Corner.
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.
&&
A tornado watch remains in effect until 100 AM EDT for central and
northern Delaware...and eastern and northeastern Maryland.
LAT...LON 3926 7622 3929 7617 3932 7618 3933 7614
3937 7611 3937 7606 3941 7603 3934 7543
3932 7542 3933 7539 3931 7541 3928 7538
3908 7537 3906 7562 3901 7581 3901 7600
3904 7624 3909 7623 3917 7628
TIME...MOT...LOC 0030Z 270DEG 29KT 3929 7569 3926 7635
TORNADO...POSSIBLE
HAIL...1.25IN
WIND...60MPH
$$The office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 12, 8:50 PM EDT | Flash Flood Warning | PHI | Kent, New Castle | 3 hr |
| May 12, 8:51 PM EDT | Severe Thunderstorm Warning | PHI | Kent, Sussex | 39 min |
| May 12, 9:14 PM EDT | Areal Flood Advisory | PHI | Kent | 2 hr |
| May 12, 9:27 PM EDT | Severe Thunderstorm Warning | PHI | Kent, Sussex | 63 min |
| May 12, 10:28 PM EDT | Areal Flood Advisory | PHI | Sussex | 65 min |
| May 12, 8:40 PM EDT | Severe Thunderstorm Warning | PHI | Caroline, Kent, Queen Anne's, Talbot | 50 min |
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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.