Alert archive / Delaware / Severe Thunderstorm Warnings in 2018
Severe Thunderstorm Warning 24, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at May 15, 2018, 7:18 PM EDT for New Castle County, Delaware; Salem County, New Jersey; Cecil County, Maryland. It was in force for 57 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
- May 15, 2018, 7:18 PM EDT (23:18 UTC)
- Expired
- May 15, 2018, 8:15 PM EDT
- In force
- 57 min
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Storm-based polygon
- Hail
- 0.88 in
- Wind
- 60.0 mph
Counties New Castle County, DE, Cecil County, MD, Salem County, NJ
The radar
The Dover AFB radar (KDOX), 72 km from the middle of the area, began a volume at 23:18 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 watch it was issued in
The SPC watch in force over the same counties when this warning went out.
| Issued | Product | Office | Lasted |
|---|---|---|---|
| May 15, 1:46 PM EDT | Severe Thunderstorm Watch | SPC | 9 hr |
The nearest sounding before it
Washington/Dulle, VA (KIAD), launched 12:00Z, 11.3 hours before the alert went out and 157 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
- 47 J/kg
- Mixed-layer CIN
- -484 J/kg
- Mixed-layer LCL
- 1259 m above ground
- 0-6 km bulk shear
- 21 kt
- 0-1 km storm-relative helicity
- 117 m²/s²
- 0-3 km storm-relative helicity
- 79 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
918
WUUS51 KPHI 152318
SVRPHI
DEC003-MDC015-NJC033-160015-
/O.NEW.KPHI.SV.W.0024.180515T2318Z-180516T0015Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mount Holly NJ
718 PM EDT TUE MAY 15 2018
The National Weather Service in Mount Holly NJ has issued a
* Severe Thunderstorm Warning for...
New Castle County in northern Delaware...
Cecil County in northeastern Maryland...
Western Salem County in southern New Jersey...
* Until 815 PM EDT.
* At 718 PM EDT, a severe thunderstorm was located over Charlestown,
or near Havre De Grace, moving southeast at 40 mph.
HAZARD...60 mph wind gusts and nickel size hail.
SOURCE...Radar indicated.
IMPACT...Damage to roofs, siding, trees, and power lines is
possible.
* Locations impacted include...
Wilmington, Newark, Middletown, Elkton, Havre De Grace, Pennsville,
Carneys Point, New Castle, Salem, North East, Quinton, Delaware
City, Charlestown, Cecilton, Warwick, Zion, Barksdale, Woodland
Beach, Glasgow and Bear.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 3971 7539 3946 7540 3943 7541 3939 7549
3934 7544 3933 7540 3933 7550 3936 7551
3933 7556 3934 7576 3938 7578 3936 7590
3938 7605 3943 7600 3946 7601 3952 7598
3955 7609 3967 7616
TIME...MOT...LOC 2318Z 295DEG 36KT 3957 7598
HAIL...0.88IN
WIND...60MPH
$$
po1 follow-up statement
294
WWUS51 KPHI 160001
SVSPHI
Severe Weather Statement
National Weather Service Mount Holly NJ
801 PM EDT TUE MAY 15 2018
DEC003-MDC015-NJC033-160015-
/O.CON.KPHI.SV.W.0024.000000T0000Z-180516T0015Z/
New Castle DE-Cecil MD-Salem NJ-
801 PM EDT TUE MAY 15 2018
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 815 PM EDT
FOR SOUTHWESTERN NEW CASTLE...SOUTHEASTERN CECIL AND SOUTHWESTERN
SALEM COUNTIES...
At 800 PM EDT, severe thunderstorms were located across Cecil
and northern New castle counties, near Middletown, moving southeast
at 20 mph.
HAZARD...60 mph wind gusts and nickel size hail.
SOURCE...Radar indicated.
IMPACT...Damage to roofs, siding, trees, and power lines is
possible.
Locations impacted include...
Middletown, Salem, Quinton, Delaware City, Charlestown, Cecilton,
Warwick, Saint Georges, Mount Pleasant, Woodland Beach, Bohemias
Mills, Hancocks Bridge, Port Penn, Brantwood, Hope Creek, Cayots,
Hollywood Beach, Glasgow, Townsend and Chesapeake City.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 3961 7540 3943 7541 3939 7549 3933 7544
3933 7550 3935 7549 3936 7551 3935 7555
3933 7556 3934 7576 3938 7578 3936 7590
3938 7605 3943 7600 3946 7601 3952 7598
3956 7609 3957 7601
TIME...MOT...LOC 0000Z 295DEG 36KT 3939 7548
HAIL...0.88IN
WIND...60MPH
$$The office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 14, 8:45 PM EDT | Special Weather Statement | PHI | Sussex | 30 min |
| May 15, 3:40 AM EDT | Flash Flood Watch | PHI | Kent, New Castle, Sussex | 21 hr |
| May 15, 5:35 PM EDT | Areal Flood Advisory | PHI | New Castle | 4 hr |
| May 15, 5:38 PM EDT | Severe Thunderstorm Warning | PHI | New Castle | 67 min |
| May 15, 6:10 PM EDT | Areal Flood Advisory | PHI | New Castle | 4 hr |
| May 15, 6:35 PM EDT | Severe Thunderstorm Warning | PHI | Kent, New Castle | 40 min |
| May 15, 6:58 PM EDT | Areal Flood Advisory | PHI | New Castle | 4 hr |
| May 15, 2:49 PM EDT | Special Weather Statement | PHI | Sussex, Warren | 56 min |
| May 15, 3:46 PM EDT | Severe Thunderstorm Warning | PHI | Hunterdon, Morris, Sussex, Warren | 74 min |
| May 15, 4:24 PM EDT | Special Weather Statement | PHI | Hunterdon, Somerset | 51 min |
| May 15, 4:41 PM EDT | Severe Thunderstorm Warning | PHI | Hunterdon, Mercer, Middlesex, Morris, Somerset, Warren | 64 min |
| May 15, 4:49 PM EDT | Special Marine Warning | PHI | 86 min | |
| May 15, 5:22 PM EDT | Severe Thunderstorm Warning | PHI | Burlington, Mercer, Middlesex, Monmouth, Ocean | 38 min |
| May 15, 5:31 PM EDT | Areal Flood Advisory | PHI | Hunterdon, Mercer, Middlesex, Morris, Somerset | 3 hr |
| May 15, 5:53 PM EDT | Severe Thunderstorm Warning | PHI | Burlington, Mercer, Middlesex, Monmouth, Ocean | 52 min |
| May 15, 6:02 PM EDT | Special Marine Warning | PHI | 88 min | |
| May 15, 6:12 PM EDT | Special Marine Warning | PHI | 63 min | |
| May 15, 6:17 PM EDT | Special Weather Statement | PHI | Burlington, Camden, Cumberland, Gloucester, Ocean | 43 min |
| May 15, 6:46 PM EDT | Special Weather Statement | PHI | Atlantic, Cumberland, Ocean, Salem | 74 min |
| May 15, 7:14 PM EDT | Special Marine Warning | PHI | 91 min | |
| May 15, 7:30 PM EDT | Special Marine Warning | PHI | 90 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.