Alert archive / New Jersey / Severe Thunderstorm Warnings in 2017

Severe Thunderstorm Warning 184, NWS Philadelphia/Mount Holly

August 22, 2017Sussex County, Warren County, New Jersey; Monroe County, Northampton County, Pennsylvania

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Aug 22, 2017, 8:58 PM EDT for Sussex County, Warren County, New Jersey; Monroe County, Northampton County, Pennsylvania. It was in force for 24 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: Aug 22, 2017, 8:58 PM EDT (00:58 UTC)
Expired: Aug 22, 2017, 9:22 PM EDT
In force: 24 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon
Tornado: Possible
Hail: 0.88 in
Wind: 60.0 mph

Counties Sussex County, NJ, Warren County, NJ, Monroe County, PA, Northampton County, PA

The radar

The Philadelphia radar (KDIX), 117 km from the middle of the area, began a volume at 00:58 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 22, 9:09 PM EDT	TSTM WND DMG	Upper Mount Bethel Twp, PA	TREES REPORTED DOWN. TIME ESTIMATED BY RADAR.
Aug 22, 9:10 PM EDT	TSTM WND DMG	Bangor, PA	SOME TREES DOWN. TIME ESTIMATED 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
Aug 22, 4:19 PM EDT	Severe Thunderstorm Watch	SPC	8 hr

The nearest sounding before it

Brookhaven, NY (KOKX), launched 00:00Z, 1.0 hours before the alert went out and 167 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.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 1278 J/kg
Mixed-layer CIN: -59 J/kg
Mixed-layer LCL: 845 m above ground
0-6 km bulk shear: 36 kt
0-1 km storm-relative helicity: 171 m²/s²
0-3 km storm-relative helicity: 220 m²/s²
Significant tornado parameter: 1.1
Supercell composite: 4.6

Open this sounding in Storm Lab

The text

As transmitted.

397 
WUUS51 KPHI 230058
SVRPHI
NJC037-041-PAC089-095-230145-
/O.NEW.KPHI.SV.W.0184.170823T0058Z-170823T0145Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mount Holly NJ
858 PM EDT TUE AUG 22 2017

The National Weather Service in Mount Holly NJ has issued a

* Severe Thunderstorm Warning for...
  Southern Sussex County in northwestern New Jersey...
  Warren County in northwestern New Jersey...
  Southeastern Monroe County in northeastern Pennsylvania...
  Northeastern Northampton County in eastern Pennsylvania...

* Until 945 PM EDT

* At 858 PM EDT, severe thunderstorms were located along a line
  extending from near Echo Lake to Rossland, moving east at 30 mph.

  HAZARD...60 mph wind gusts and nickel size hail. 

  SOURCE...Radar indicated. 

  IMPACT...Expect damage to trees and power lines. 

* Locations impacted include...
  Newton, Hopatcong, East Stroudsburg, Hackettstown, Washington,
  Blairstown, Bangor, Mount Arlington, Franklin, Stanhope, Pen Argyl,
  Hamburg, Netcong, Wind Gap, Belvidere, Oxford, Ogdensburg, Hope,
  East Bangor and Andover.

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.

For your protection move to an interior room on the lowest floor of a
building.

&&

LAT...LON 4097 7464 4092 7465 4090 7471 4092 7473
      4091 7476 4088 7481 4086 7480 4082 7483
      4078 7490 4074 7494 4088 7552 4109 7514
      4110 7505 4108 7503 4111 7498 4118 7440
TIME...MOT...LOC 0058Z 258DEG 28KT 4103 7501 4090 7540 

TORNADO...POSSIBLE
HAIL...0.88IN
WIND...60MPH
 
$$

CMS

1 follow-up statement

153 
WWUS51 KPHI 230122
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
922 PM EDT TUE AUG 22 2017

NJC037-041-PAC089-095-230132-
/O.CAN.KPHI.SV.W.0184.000000T0000Z-170823T0145Z/
Sussex NJ-Warren NJ-Monroe PA-Northampton PA-
922 PM EDT TUE AUG 22 2017

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHERN SUSSEX...WARREN...
SOUTHEASTERN MONROE AND NORTHEASTERN NORTHAMPTON 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 and
heavy rain are still possible with these thunderstorms.

A severe thunderstorm watch remains in effect until midnight EDT for
northern and northwestern New Jersey...and eastern and northeastern
Pennsylvania.

LAT...LON 4097 7464 4092 7465 4090 7471 4092 7473
      4091 7476 4088 7481 4086 7480 4082 7483
      4078 7490 4074 7494 4088 7552 4109 7514
      4110 7505 4108 7503 4111 7498 4118 7440
TIME...MOT...LOC 0116Z 258DEG 28KT 4106 7482 4093 7521 

$$

CMS

The office that day

Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Aug 22, 8:12 PM EDT	Severe Thunderstorm Warning	PHI	Sussex, Warren	48 min
Aug 22, 8:15 PM EDT	Tornado Warning	PHI	Warren	30 min
Aug 22, 8:20 PM EDT	Special Weather Statement	PHI	Sussex	40 min
Aug 22, 8:45 PM EDT	Severe Thunderstorm Warning	PHI	Hunterdon, Somerset, Warren	60 min
Aug 22, 9:42 PM EDT	Severe Thunderstorm Warning	PHI	Hunterdon, Mercer, Middlesex, Morris, Somerset, Warren	48 min
Aug 22, 10:07 PM EDT	Severe Thunderstorm Warning	PHI	Gloucester, Salem	53 min
Aug 22, 10:13 PM EDT	Special Marine Warning	PHI		92 min
Aug 22, 10:27 PM EDT	Severe Thunderstorm Warning	PHI	Hunterdon, Mercer, Middlesex, Monmouth, Somerset	48 min
Aug 22, 10:37 PM EDT	Areal Flood Advisory	PHI	Hunterdon, Mercer, Middlesex, Monmouth, Somerset	4 hr
Aug 22, 10:40 PM EDT	Areal Flood Advisory	PHI	Mercer	4 hr
Aug 22, 10:58 PM EDT	Severe Thunderstorm Warning	PHI	Burlington, Camden, Cumberland, Gloucester, Mercer, Middlesex and 1 more	62 min
Aug 22, 11:39 PM EDT	Special Marine Warning	PHI		66 min
Aug 22, 11:42 PM EDT	Flash Flood Warning	PHI	Hunterdon, Middlesex, Somerset	4 hr
Aug 22, 11:46 PM EDT	Severe Thunderstorm Warning	PHI	Atlantic, Burlington, Camden, Gloucester, Ocean, Salem	44 min
Aug 23, 12:06 AM EDT	Flash Flood Warning	PHI	Camden, Gloucester	4 hr
Aug 23, 12:29 AM EDT	Severe Thunderstorm Warning	PHI	Burlington, Camden, Gloucester, Ocean	46 min
Aug 23, 12:37 AM EDT	Areal Flood Advisory	PHI	Burlington, Camden, Gloucester, Mercer, Middlesex, Monmouth and 1 more	4 hr
Aug 23, 1:56 AM EDT	Areal Flood Advisory	PHI	Salem	4 hr
Aug 23, 2:43 AM EDT	Areal Flood Advisory	PHI	Atlantic, Burlington, Camden, Cumberland, Gloucester, Ocean and 1 more	4 hr
Aug 23, 3:37 AM EDT	Areal Flood Warning	PHI	Hunterdon, Middlesex, Somerset	4 hr
Aug 23, 4:02 AM EDT	Areal Flood Warning	PHI	Camden, Gloucester	4 hr
Aug 22, 9:18 PM EDT	Areal Flood Advisory	PHI	Berks, Montgomery	4 hr
Aug 22, 9:23 PM EDT	Severe Thunderstorm Warning	PHI	Berks, Chester, Montgomery	52 min
Aug 22, 9:40 PM EDT	Tornado Warning	PHI	Berks, Chester, Montgomery	20 min

Nearby

Severe Thunderstorm Warnings in New Jersey, 2017 Severe Thunderstorm Warnings in Pennsylvania, 2017 Every 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.