Alert archive / Delaware / Severe Thunderstorm Warnings in 2018
Severe Thunderstorm Warning 6, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at May 12, 2018, 7:16 PM EDT for 4 states. It was in force for 44 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
- May 12, 2018, 7:16 PM EDT (23:16 UTC)
- Expired
- May 12, 2018, 8:00 PM EDT
- In force
- 44 min
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Storm-based polygon
- Hail
- 1.0 in
- Wind
- 60.0 mph
Counties New Castle County, DE, Cecil County, MD, Salem County, NJ, Chester County, PA
The radar
The Dover AFB radar (KDOX), 109 km from the middle of the area, began a volume at 23:17 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, 7:25 PM EDT | HAIL 0.88 | Kemblesville, PA | |
| May 12, 7:42 PM EDT | HAIL 0.75 | Newark, DE | PEA TO DIME SIZE HAIL REPORTED IN NEWARK. |
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 12:00Z, 11.3 hours before the alert went out and 150 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 1390 m above ground
- 0-6 km bulk shear
- 38 kt
- 0-1 km storm-relative helicity
- 178 m²/s²
- 0-3 km storm-relative helicity
- 201 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
753
WUUS51 KPHI 122316
SVRPHI
DEC003-MDC015-NJC033-PAC029-130000-
/O.NEW.KPHI.SV.W.0006.180512T2316Z-180513T0000Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mount Holly NJ
716 PM EDT SAT MAY 12 2018
The National Weather Service in Mount Holly NJ has issued a
* Severe Thunderstorm Warning for...
Northwestern New Castle County in northern Delaware...
Northeastern Cecil County in northeastern Maryland...
West central Salem County in southern New Jersey...
Southwestern Chester County in southeastern Pennsylvania...
* Until 800 PM EDT.
* At 715 PM EDT, a severe thunderstorm was located over Oxford, or 13
miles northwest of Newark, moving east at 40 mph.
HAZARD...60 mph wind gusts and quarter 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...
Newark, Elkton, Calvert, Pennsville, Carneys Point, New Castle,
Salem, Oxford, Rising Sun, Delaware City, Glen Roy, Zion, Blake,
Barksdale, Stanton, Glasgow, Bear, Port Penn, Wilmington Manor and
Pike Creek.
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.
&&
A tornado watch remains in effect until 100 AM EDT for northern
Delaware...northeastern Maryland...southern New Jersey...and
southeastern Pennsylvania.
LAT...LON 3974 7612 3973 7610 3974 7610 3976 7606
3980 7605 3981 7603 3966 7541 3947 7548
3972 7614
TIME...MOT...LOC 2315Z 287DEG 39KT 3977 7598
HAIL...1.00IN
WIND...60MPH
$$2 follow-up statements
638
WWUS51 KPHI 122340
SVSPHI
Severe Weather Statement
National Weather Service Mount Holly NJ
740 PM EDT SAT MAY 12 2018
DEC003-MDC015-NJC033-PAC029-130000-
/O.CON.KPHI.SV.W.0006.000000T0000Z-180513T0000Z/
New Castle DE-Cecil MD-Salem NJ-Chester PA-
740 PM EDT SAT MAY 12 2018
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 800 PM EDT
FOR NORTHWESTERN NEW CASTLE...NORTHEASTERN CECIL...WEST CENTRAL SALEM
AND SOUTHWESTERN CHESTER COUNTIES...
At 740 PM EDT, a severe thunderstorm was located near Stanton, or
near Newark, moving east at 40 mph.
HAZARD...60 mph wind gusts and half dollar size hail.
SOURCE...Radar indicated.
IMPACT...Minor damage to vehicles is possible. Wind damage to roofs,
siding, trees, and power lines is possible.
Locations impacted include...
Newark, Elkton, Calvert, Pennsville, Carneys Point, New Castle,
Salem, Oxford, Rising Sun, Delaware City, Glen Roy, Zion, Blake,
Barksdale, Stanton, Glasgow, Bear, Wilmington Manor, Pike Creek and
Fair Hill.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
A tornado watch remains in effect for the warned area. Tornadoes can
develop quickly from severe thunderstorms. Although a tornado is not
immediately likely, if one is spotted act quickly and move to a place
of safety inside a sturdy structure, such as a basement or small
interior room.
For your protection move to an interior room on the lowest floor of a
building.
In addition to large hail and damaging winds, frequent cloud to
ground lightning is occurring with this storm. Move indoors
immediately. Remember, if you can hear thunder, you are close enough
to be struck by lightning.
&&
A tornado watch remains in effect until 100 AM EDT for northern
Delaware...northeastern Maryland...southern New Jersey...and
southeastern Pennsylvania.
LAT...LON 3974 7612 3973 7610 3976 7606 3980 7605
3981 7603 3966 7541 3951 7546 3954 7566
3972 7614
TIME...MOT...LOC 2340Z 289DEG 36KT 3968 7568
HAIL...1.25IN
WIND...60MPH
$$
JRK552
WWUS51 KPHI 122356 RRA
SVSPHI
Severe Weather Statement
National Weather Service Mount Holly NJ
756 PM EDT SAT MAY 12 2018
DEC003-MDC015-NJC033-PAC029-130005-
/O.EXP.KPHI.SV.W.0006.000000T0000Z-180513T0000Z/
New Castle DE-Cecil MD-Salem NJ-Chester PA-
756 PM EDT SAT MAY 12 2018
...THE SEVERE THUNDERSTORM WARNING FOR NORTHWESTERN NEW CASTLE...
NORTHEASTERN CECIL...WEST CENTRAL SALEM AND SOUTHWESTERN CHESTER
COUNTIES WILL EXPIRE AT 800 PM EDT...
The storm which prompted the warning has moved out of the area.
Therefore, the warning will be allowed to expire. However small hail
and gusty winds are still possible with additional strong
thunderstorms moving into the area.
A tornado watch remains in effect until 100 AM EDT for northern
Delaware...northeastern Maryland...southern New Jersey...and
southeastern Pennsylvania.
LAT...LON 3974 7612 3973 7610 3976 7606 3980 7605
3981 7603 3966 7541 3951 7546 3954 7566
3972 7614
TIME...MOT...LOC 2355Z 287DEG 39KT 3963 7548
$$The office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 12, 7:00 PM EDT | Severe Thunderstorm Warning | PHI | New Castle | 45 min |
| May 12, 7:10 PM EDT | Areal Flood Advisory | PHI | New Castle | 2 hr |
| May 12, 7:25 PM EDT | Severe Thunderstorm Warning | PHI | Kent, New Castle | 50 min |
| May 12, 7:30 PM EDT | Severe Thunderstorm Warning | PHI | New Castle | 45 min |
| May 12, 7:45 PM EDT | Severe Thunderstorm Warning | PHI | Kent, New Castle | 45 min |
| May 12, 7:57 PM EDT | Areal Flood Advisory | PHI | Kent, New Castle | 4 hr |
| May 12, 6:26 AM EDT | Special Weather Statement | PHI | Atlantic | 49 min |
| May 12, 7:02 AM EDT | Special Marine Warning | PHI | 58 min | |
| May 12, 6:53 PM EDT | Special Weather Statement | PHI | Mercer | 52 min |
| May 12, 7:37 PM EDT | Areal Flood Advisory | PHI | Burlington, Camden, Mercer, Monmouth, Ocean | 2 hr |
| May 12, 7:48 PM EDT | Special Marine Warning | PHI | 57 min | |
| May 12, 7:43 PM EDT | Special Weather Statement | PHI | Cecil | 32 min |
| May 12, 6:51 PM EDT | Special Weather Statement | PHI | Chester | 39 min |
Nearby
Severe Thunderstorm Warnings in Delaware, 2018Severe Thunderstorm Warnings in New Jersey, 2018Severe Thunderstorm Warnings in Maryland, 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.