Alert archive / New Jersey / Severe Thunderstorm Warnings in 2017
Severe Thunderstorm Warning 167, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Aug 18, 2017, 5:39 PM EDT for 4 states. It was in force for 66 min. 1 report 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
- Aug 18, 2017, 5:39 PM EDT (21:39 UTC)
- Expired
- Aug 18, 2017, 6:45 PM EDT
- In force
- 66 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, Kent County, MD, Burlington County, NJ, Camden County, NJ, Gloucester County, NJ, Salem County, NJ, Chester County, PA, Delaware County, PA, Philadelphia County, PA
The radar
The Dover AFB radar (KDOX), 94 km from the middle of the area, began a volume at 21:43 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 |
|---|---|---|---|
| Aug 18, 5:40 PM EDT | TSTM WND DMG | New Garden, PA | SEVERAL TREES DOWN. |
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 |
|---|---|---|---|
| Aug 18, 2:27 PM EDT | Severe Thunderstorm Watch | SPC | 9 hr |
The nearest sounding before it
Washington/Dulle, VA (KIAD), launched 12:00Z, 9.7 hours before the alert went out and 162 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
- 746 J/kg
- Mixed-layer CIN
- -72 J/kg
- Mixed-layer LCL
- 651 m above ground
- 0-6 km bulk shear
- 26 kt
- 0-1 km storm-relative helicity
- 12 m²/s²
- 0-3 km storm-relative helicity
- 76 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.3
The text
As transmitted.
957
WUUS51 KPHI 182139
SVRPHI
DEC003-MDC015-029-NJC005-007-015-033-PAC029-045-101-182245-
/O.NEW.KPHI.SV.W.0167.170818T2139Z-170818T2245Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mount Holly NJ
539 PM EDT FRI AUG 18 2017
The National Weather Service in Mount Holly NJ has issued a
* Severe Thunderstorm Warning for...
New Castle County in northern Delaware...
Northern Kent County in northeastern Maryland...
Cecil County in northeastern Maryland...
Northwestern Salem County in southern New Jersey...
Northwestern Camden County in southern New Jersey...
Northwestern Gloucester County in southern New Jersey...
Northwestern Burlington County in southern New Jersey...
Southeastern Chester County in southeastern Pennsylvania...
Philadelphia County in southeastern Pennsylvania...
Delaware County in southeastern Pennsylvania...
* Until 645 PM EDT
* At 539 PM EDT, severe thunderstorms were located along a line
extending from near Kennett Square to Back River, moving east at 30
mph.
HAZARD...60 mph wind gusts and quarter size hail.
SOURCE...Radar indicated.
IMPACT...Minor damage to vehicles is possible. Expect damage to
trees and power lines.
* Locations impacted include...
Philadelphia, Camden, Wilmington, Newark, Middletown, West Chester,
Elkton, Havre De Grace, Gloucester City, Calvert, Chester,
Willingboro, Deptford, West Deptford, Pennsville, Bellmawr, Yeadon,
Westtown, Woodbury and Burlington.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
To report severe weather, contact your nearest law enforcement
agency. They will send your report to the National Weather Service
office in Mount Holly NJ.
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 3929 7617 3932 7618 3933 7614 3937 7611
3937 7606 3943 7600 3952 7598 3955 7603
3955 7608 3962 7615 3993 7582 4001 7530
3998 7527 4001 7521 4003 7522 4006 7498
4005 7497 4010 7475 3926 7580 3923 7623
TIME...MOT...LOC 2139Z 258DEG 28KT 3988 7565 3928 7644
HAIL...1.00IN
WIND...60MPH
$$
SFJ2 follow-up statements
636
WWUS51 KPHI 182205
SVSPHI
Severe Weather Statement
National Weather Service Mount Holly NJ
605 PM EDT FRI AUG 18 2017
DEC003-MDC015-029-NJC005-007-015-033-PAC029-045-101-182245-
/O.CON.KPHI.SV.W.0167.000000T0000Z-170818T2245Z/
New Castle DE-Kent MD-Cecil MD-Salem NJ-Camden NJ-Gloucester NJ-
Burlington NJ-Chester PA-Philadelphia PA-Delaware PA-
605 PM EDT FRI AUG 18 2017
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 645 PM EDT
FOR NEW CASTLE...NORTHERN KENT...CECIL...NORTHWESTERN SALEM...
NORTHWESTERN CAMDEN...NORTHWESTERN GLOUCESTER...NORTHWESTERN
BURLINGTON...SOUTHEASTERN CHESTER...PHILADELPHIA AND DELAWARE
COUNTIES...
At 605 PM EDT, severe thunderstorms were located along a line
extending from near Lima to near Newtown, moving east at 30 mph.
HAZARD...60 mph wind gusts and quarter size hail.
SOURCE...Radar indicated.
IMPACT...Minor damage to vehicles is possible. Expect damage to
trees and power lines.
Locations impacted include...
Philadelphia, Camden, Wilmington, Newark, Middletown, West Chester,
Elkton, Gloucester City, Calvert, Chester, Willingboro, Deptford,
West Deptford, Pennsville, Bellmawr, Yeadon, Westtown, Woodbury,
Burlington and Riverside.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
To report severe weather contact your nearest law enforcement agency.
They will send your report to the National Weather Service office in
Mount Holly NJ.
In addition to large hail and damaging winds...frequent cloud to
ground lightning is occurring with this storm. Move indoors
immediately. Remember...if you can hear thunder...you are close
enough to be struck by lightning.
&&
LAT...LON 3929 7617 3932 7618 3937 7611 3937 7606
3943 7600 3952 7598 3955 7608 3960 7611
3994 7571 4001 7530 3998 7527 4001 7521
4003 7522 4005 7497 4010 7475 3926 7580
3923 7623
TIME...MOT...LOC 2205Z 258DEG 28KT 3992 7540 3932 7619
HAIL...1.00IN
WIND...60MPH
$$
SFJ549
WWUS51 KPHI 182239
SVSPHI
Severe Weather Statement
National Weather Service Mount Holly NJ
639 PM EDT FRI AUG 18 2017
DEC003-MDC015-029-NJC005-007-015-033-PAC029-045-101-182249-
/O.EXP.KPHI.SV.W.0167.000000T0000Z-170818T2245Z/
New Castle DE-Kent MD-Cecil MD-Salem NJ-Camden NJ-Gloucester NJ-
Burlington NJ-Chester PA-Philadelphia PA-Delaware PA-
639 PM EDT FRI AUG 18 2017
...THE SEVERE THUNDERSTORM WARNING FOR NEW CASTLE...KENT...CECIL...
NORTHWESTERN SALEM...NORTHWESTERN CAMDEN...NORTHWESTERN GLOUCESTER...
NORTHWESTERN BURLINGTON...SOUTHEASTERN CHESTER...PHILADELPHIA AND
DELAWARE COUNTIES WILL EXPIRE AT 645 PM EDT...
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 will be allowed to expire. However gusty winds
and heavy rain are still possible with these thunderstorms.
A severe thunderstorm watch remains in effect until 900 PM EDT for
central and northern Delaware...northeastern Maryland...southern New
Jersey...and southeastern Pennsylvania.
LAT...LON 3929 7617 3932 7618 3937 7611 3937 7606
3943 7600 3952 7598 3955 7608 3960 7611
3994 7571 4001 7530 3998 7527 4001 7521
4003 7522 4005 7497 4010 7475 3926 7580
3923 7623
TIME...MOT...LOC 2239Z 258DEG 28KT 3997 7509 3937 7589
$$
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 | Caroline, Cecil, Kent, Queen Anne's, Talbot | 18 hr |
| Aug 18, 4:29 PM EDT | Severe Thunderstorm Warning | PHI | Cecil | 61 min |
| Aug 18, 4:57 PM EDT | Areal Flood Advisory | PHI | Cecil | 3 hr |
| Aug 18, 5:03 PM EDT | Severe Thunderstorm Warning | PHI | Cecil, Kent | 42 min |
| Aug 18, 6:10 PM EDT | Severe Thunderstorm Warning | PHI | Caroline, Kent, Queen Anne's, Talbot | 65 min |
| Aug 18, 6:12 PM EDT | Areal Flood Advisory | PHI | Cecil, Kent, Queen Anne's | 3 hr |
| Aug 18, 7:07 PM EDT | Severe Thunderstorm Warning | PHI | Caroline, Kent, Queen Anne's, Talbot | 53 min |
| Aug 18, 7:33 PM EDT | Areal Flood Advisory | PHI | Caroline, Talbot | 3 hr |
| Aug 18, 7:53 PM EDT | Severe Thunderstorm Warning | PHI | Caroline, Kent, Queen Anne's, Talbot | 48 min |
| 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, 5:42 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 | |
| Aug 18, 7:49 PM EDT | Severe Thunderstorm Warning | PHI | Atlantic, Cape May, Cumberland, Gloucester | 35 min |
| Aug 18, 4:48 AM EDT | Areal Flood Advisory | PHI | Berks, Lehigh, Northampton | 4 hr |
| Aug 18, 2:10 PM EDT | Areal Flood Advisory | PHI | Berks, Carbon, Lehigh | 4 hr |
| Aug 18, 2:21 PM EDT | Special Weather Statement | PHI | Berks | 24 min |
| Aug 18, 2:33 PM EDT | Severe Thunderstorm Warning | PHI | Berks, Lehigh | 42 min |
| Aug 18, 3:14 PM EDT | Special Weather Statement | PHI | Berks, Lehigh | 31 min |
| Aug 18, 3:15 PM EDT | Areal Flood Advisory | PHI | Berks | 4 hr |
| Aug 18, 3:19 PM EDT | Special Weather Statement | PHI | Northampton | 26 min |
| Aug 18, 3:37 PM EDT | Special Weather Statement | PHI | Carbon | 38 min |
| Aug 18, 3:43 PM EDT | Special Weather Statement | PHI | Berks | 32 min |
| Aug 18, 3:45 PM EDT | Areal Flood Advisory | PHI | Carbon, Lehigh, Monroe, Northampton | 4 hr |
| Aug 18, 3:46 PM EDT | Severe Thunderstorm Warning | PHI | Berks, Lehigh, Montgomery, Northampton | 44 min |
| Aug 18, 4:02 PM EDT | Flash Flood Warning | PHI | Berks | 4 hr |
| Aug 18, 4:24 PM EDT | Severe Thunderstorm Warning | PHI | Berks, Bucks, Montgomery | 51 min |
| Aug 18, 6:20 PM EDT | Special Weather Statement | PHI | Sussex | 25 min |
Nearby
Severe Thunderstorm Warnings in New Jersey, 2017Severe Thunderstorm Warnings in Pennsylvania, 2017Severe Thunderstorm Warnings in Maryland, 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.