Alert archive / New Jersey / Severe Thunderstorm Warnings in 2017
Severe Thunderstorm Warning 174, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Aug 18, 2017, 7:49 PM EDT for 4 counties in New Jersey. It was in force for 35 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
- Aug 18, 2017, 7:49 PM EDT (23:49 UTC)
- Expired
- Aug 18, 2017, 8:24 PM EDT
- In force
- 35 min
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Storm-based polygon
- Tornado
- Possible
- Hail
- 0.88 in
- Wind
- 60.0 mph
Counties Atlantic County, NJ, Cape May County, NJ, Cumberland County, NJ, Gloucester County, NJ
The radar
The Dover AFB radar (KDOX), 72 km from the middle of the area, began a volume at 23:52 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 |
|---|---|---|---|
| Aug 18, 2:27 PM EDT | Severe Thunderstorm Watch | SPC | 9 hr |
The nearest sounding before it
Wallops Is Stn, VA (KWAL), launched 12:00Z, 11.8 hours before the alert went out and 155 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
- 582 J/kg
- Mixed-layer CIN
- -57 J/kg
- Mixed-layer LCL
- 808 m above ground
- 0-6 km bulk shear
- 19 kt
- 0-1 km storm-relative helicity
- 105 m²/s²
- 0-3 km storm-relative helicity
- 112 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
213
WUUS51 KPHI 182349
SVRPHI
NJC001-009-011-015-190045-
/O.NEW.KPHI.SV.W.0174.170818T2349Z-170819T0045Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mount Holly NJ
749 PM EDT FRI AUG 18 2017
The National Weather Service in Mount Holly NJ has issued a
* Severe Thunderstorm Warning for...
Atlantic County in southern New Jersey...
Eastern Cumberland County in southern New Jersey...
Southeastern Gloucester County in southern New Jersey...
Cape May County in southern New Jersey...
* Until 845 PM EDT
* At 749 PM EDT, severe thunderstorms were located along a line
extending from Buena to near Bivalve, moving east at 20 mph.
HAZARD...60 mph wind gusts and nickel size hail.
SOURCE...Radar indicated.
IMPACT...Expect damage to trees and power lines.
* Locations impacted include...
Vineland, Atlantic City, Millville, Ocean City, Cumberland,
Pleasantville, Somers Point, Ventnor City, Brigantine, Northfield,
Absecon, Margate City, Buena, Egg Harbor City, North Wildwood,
Laurel Lake, Weymouth, Woodbine, Sea Isle City and Estell Manor.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Remain alert for a possible tornado! Tornadoes can develop quickly
from severe thunderstorms. If you spot a tornado go at once into the
basement or small central room in a sturdy structure.
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.
&&
LAT...LON 3931 7444 3919 7462 3901 7478 3908 7495
3915 7493 3919 7508 3916 7514 3917 7517
3961 7500 3950 7437
TIME...MOT...LOC 2349Z 290DEG 18KT 3952 7496 3922 7507
TORNADO...POSSIBLE
HAIL...0.88IN
WIND...60MPH
$$
SFJ2 follow-up statements
566
WWUS51 KPHI 190011
SVSPHI
Severe Weather Statement
National Weather Service Mount Holly NJ
811 PM EDT FRI AUG 18 2017
NJC015-190021-
/O.CAN.KPHI.SV.W.0174.000000T0000Z-170819T0045Z/
Gloucester NJ-
811 PM EDT FRI AUG 18 2017
...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN GLOUCESTER COUNTY
IS CANCELLED...
The storms which prompted the warning have moved out of the county.
Therefore, the warning has been cancelled.
A severe thunderstorm watch remains in effect until 900 PM EDT for
southern New Jersey.
LAT...LON 3932 7444 3919 7462 3901 7478 3908 7495
3915 7493 3919 7508 3959 7489 3950 7437
TIME...MOT...LOC 0011Z 290DEG 18KT 3949 7484 3919 7495
$$
NJC001-009-011-190045-
/O.CON.KPHI.SV.W.0174.000000T0000Z-170819T0045Z/
Atlantic NJ-Cumberland NJ-Cape May NJ-
811 PM EDT FRI AUG 18 2017
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 845 PM EDT
FOR ATLANTIC...SOUTHEASTERN CUMBERLAND AND CAPE MAY COUNTIES...
At 811 PM EDT, severe thunderstorms were located along a line
extending from Mizpah to near Eldora, moving east at 20 mph.
HAZARD...60 mph wind gusts and penny size hail.
SOURCE...Radar indicated.
IMPACT...Expect damage to trees and power lines.
Locations impacted include...
Vineland, Atlantic City, Millville, Ocean City, Cumberland,
Pleasantville, Somers Point, Ventnor City, Brigantine, Northfield,
Absecon, Margate City, Buena, Egg Harbor City, North Wildwood, Laurel
Lake, Weymouth, Woodbine, Sea Isle City and Estell Manor.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Remain alert for a possible tornado! Tornadoes can develop quickly
from severe thunderstorms. If you spot a tornado go at once into the
basement or small central room in a sturdy structure.
&&
LAT...LON 3932 7444 3919 7462 3901 7478 3908 7495
3915 7493 3919 7508 3959 7489 3950 7437
TIME...MOT...LOC 0011Z 290DEG 18KT 3949 7484 3919 7495
TORNADO...POSSIBLE
HAIL...0.75IN
WIND...60MPH
$$
SFJ319
WWUS51 KPHI 190024
SVSPHI
Severe Weather Statement
National Weather Service Mount Holly NJ
824 PM EDT FRI AUG 18 2017
NJC001-009-011-190034-
/O.CAN.KPHI.SV.W.0174.000000T0000Z-170819T0045Z/
Atlantic NJ-Cumberland NJ-Cape May NJ-
824 PM EDT FRI AUG 18 2017
...THE SEVERE THUNDERSTORM WARNING FOR ATLANTIC...SOUTHEASTERN
CUMBERLAND AND CAPE MAY COUNTIES IS CANCELLED...
The storms which prompted the warning have weakened below severe
limits, and no longer pose an immediate threat to life or property.
Therefore the warning has been cancelled. However gusty winds are
still possible with these thunderstorms.
A severe thunderstorm watch remains in effect until 1100 PM EDT for
southern New Jersey.
LAT...LON 3932 7444 3919 7462 3901 7478 3908 7495
3915 7493 3919 7508 3959 7489 3950 7437
TIME...MOT...LOC 0021Z 290DEG 18KT 3947 7477 3917 7488
$$
SFJThe office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 18, 3:39 AM EDT | Flash Flood Watch | PHI | Atlantic, Burlington, Camden, Cape May, Cumberland, Gloucester and 10 more | 18 hr |
| Aug 18, 3:41 AM EDT | Small Craft Advisory | PHI | 18 hr | |
| Aug 18, 10:51 AM EDT | Special Weather Statement | PHI | Ocean | 54 min |
| Aug 18, 11:19 AM EDT | Areal Flood Advisory | PHI | Burlington, Ocean | 116 min |
| Aug 18, 11:28 AM EDT | Special Weather Statement | PHI | Ocean | 47 min |
| Aug 18, 5:08 PM EDT | Special Weather Statement | PHI | Hunterdon, Warren | 37 min |
| Aug 18, 5:11 PM EDT | Severe Thunderstorm Warning | PHI | Hunterdon, Mercer, Somerset | 49 min |
| Aug 18, 5:20 PM EDT | Areal Flood Advisory | PHI | Burlington, Camden, Gloucester, Mercer, Salem | 3 hr |
| Aug 18, 5:39 PM EDT | Severe Thunderstorm Warning | PHI | Burlington, Camden, Gloucester, Salem | 66 min |
| Aug 18, 5:42 PM EDT | Special Weather Statement | PHI | Hunterdon | 33 min |
| Aug 18, 5:46 PM EDT | Severe Thunderstorm Warning | PHI | Hunterdon, Morris, Somerset | 44 min |
| Aug 18, 5:50 PM EDT | Special Marine Warning | PHI | 55 min | |
| Aug 18, 5:54 PM EDT | Severe Thunderstorm Warning | PHI | Burlington, Mercer, Middlesex, Monmouth | 66 min |
| Aug 18, 6:13 PM EDT | Special Weather Statement | PHI | Middlesex, Somerset | 32 min |
| Aug 18, 6:20 PM EDT | Areal Flood Advisory | PHI | Middlesex, Somerset | 3 hr |
| Aug 18, 6:23 PM EDT | Special Weather Statement | PHI | Somerset | 37 min |
| Aug 18, 6:38 PM EDT | Special Weather Statement | PHI | Camden, Gloucester, Salem | 37 min |
| Aug 18, 6:41 PM EDT | Special Marine Warning | PHI | 64 min | |
| Aug 18, 6:43 PM EDT | Areal Flood Advisory | PHI | Monmouth, Ocean | 3 hr |
| Aug 18, 6:48 PM EDT | Special Weather Statement | PHI | Cumberland, Gloucester, Salem | 27 min |
| Aug 18, 6:53 PM EDT | Special Weather Statement | PHI | Middlesex, Monmouth | 52 min |
| Aug 18, 6:54 PM EDT | Special Weather Statement | PHI | Burlington, Camden, Gloucester | 51 min |
| Aug 18, 6:58 PM EDT | Severe Thunderstorm Warning | PHI | Burlington, Camden, Ocean | 29 min |
| Aug 18, 7:00 PM EDT | Severe Thunderstorm Warning | PHI | Burlington, Mercer, Middlesex, Monmouth, Ocean | 60 min |
| Aug 18, 7:19 PM EDT | Areal Flood Advisory | PHI | Atlantic, Burlington, Cape May, Cumberland, Ocean, Salem | 3 hr |
| Aug 18, 7:25 PM EDT | Special Weather Statement | PHI | Atlantic | 50 min |
| Aug 18, 7:34 PM EDT | Special Weather Statement | PHI | Cape May | 26 min |
| Aug 18, 7:39 PM EDT | Special Marine Warning | PHI | 66 min | |
| Aug 18, 7:43 PM EDT | Special Weather Statement | PHI | Burlington, Ocean | 47 min |
| Aug 18, 7:44 PM EDT | Special Marine Warning | PHI | 61 min |
Nearby
Severe Thunderstorm Warnings in New Jersey, 2017Every severe thunderstorm warning in 2017
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.