Alert archive / New Jersey / Severe Thunderstorm Warnings in 2018
Severe Thunderstorm Warning 5, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at May 12, 2018, 7:00 PM EDT for Gloucester County, Salem County, New Jersey; Chester County, Delaware County, Pennsylvania; New Castle County, Delaware. It was in force for 45 min. 6 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, 7:00 PM EDT (23:00 UTC)
- Expired
- May 12, 2018, 7:45 PM EDT
- In force
- 45 min
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Storm-based polygon
- Tornado
- Possible
- Hail
- 1.0 in
- Wind
- 60.0 mph
Counties New Castle County, DE, Gloucester County, NJ, Salem County, NJ, Chester County, PA, Delaware County, PA
The radar
The Dover AFB radar (KDOX), 123 km from the middle of the area, began a volume at 23:02 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, 7:25 PM EDT | HAIL 1 | West Grove, PA | PHOTO OF QUARTER SIZED HAIL IN WEST GROVE. TIME ESTIMATED FROM RADAR. |
| May 12, 7:35 PM EDT | HAIL 1 | 1 Ne Toughkenamon, PA | MPING REPORT OF QUARTER SIZED HAIL. |
| May 12, 7:36 PM EDT | HAIL 1 | Hockessin, DE | |
| May 12, 7:37 PM EDT | HAIL 0.75 | Concord Hills, DE | DIME-SIZED HAIL ON ROUTE 202 NEAR NAAMANS ROAD. |
| May 12, 7:46 PM EDT | HAIL 0.75 | Elsmere, DE | HAIL UP TO PENNY SIZE IN ELSMERE. TIME APPROXIMATED FROM RADAR. |
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, 11.0 hours before the alert went out and 164 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.
207
WUUS51 KPHI 122300
SVRPHI
DEC003-NJC015-033-PAC029-045-122345-
/O.NEW.KPHI.SV.W.0005.180512T2300Z-180512T2345Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mount Holly NJ
700 PM EDT SAT MAY 12 2018
The National Weather Service in Mount Holly NJ has issued a
* Severe Thunderstorm Warning for...
Northern New Castle County in northern Delaware...
Northwestern Salem County in southern New Jersey...
West central Gloucester County in southern New Jersey...
Southern Chester County in southeastern Pennsylvania...
Southwestern Delaware County in southeastern Pennsylvania...
* Until 745 PM EDT.
* At 658 PM EDT, a severe thunderstorm was located near Paradise, or
9 miles east of Willow Street, moving east at 40 mph.
HAZARD...60 mph wind gusts and quarter size hail.
SOURCE...Trained weather spotters reported nickel sized hail in
York Pennsylvania.
IMPACT...Minor damage to vehicles is possible. Wind damage to
roofs, siding, trees, and power lines is possible.
* Locations impacted include...
Wilmington, West Chester, Chester, Pennsville, Coatesville,
Westtown, Carneys Point, Downingtown, Swarthmore, Elsmere, Kennett
Square, New Castle, Penns Grove, Oxford, Parkesburg, West Grove,
Newport, Arden, Stanton and Cheyney.
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...southern New Jersey...and southeastern Pennsylvania.
LAT...LON 3983 7602 3985 7602 3987 7600 3987 7599
3992 7600 3994 7598 3995 7600 4003 7595
3998 7534 3965 7541 3980 7604 3983 7604
TIME...MOT...LOC 2258Z 280DEG 38KT 3995 7611
TORNADO...POSSIBLE
HAIL...1.00IN
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, 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, 7:16 PM EDT | Severe Thunderstorm Warning | PHI | Salem | 44 min |
| May 12, 7:30 PM EDT | Severe Thunderstorm Warning | PHI | Gloucester, Salem | 45 min |
| May 12, 7:37 PM EDT | Areal Flood Advisory | PHI | Burlington, Camden, Mercer, Monmouth, Ocean | 2 hr |
| May 12, 7:45 PM EDT | Severe Thunderstorm Warning | PHI | Atlantic, Camden, Cumberland, Gloucester, Salem | 45 min |
| May 12, 7:48 PM EDT | Special Marine Warning | PHI | 57 min | |
| May 12, 6:51 PM EDT | Special Weather Statement | PHI | Chester | 39 min |
| May 12, 7:10 PM EDT | Areal Flood Advisory | PHI | Chester, Delaware | 2 hr |
| May 12, 7:25 PM EDT | Severe Thunderstorm Warning | PHI | Kent, New Castle | 50 min |
| May 12, 7:57 PM EDT | Areal Flood Advisory | PHI | Kent, New Castle | 4 hr |
Nearby
Severe Thunderstorm Warnings in New Jersey, 2018Severe Thunderstorm Warnings in Pennsylvania, 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.