Alert archive / New Jersey / Severe Thunderstorm Warnings in 2017

Severe Thunderstorm Warning 188, NWS Philadelphia/Mount Holly

August 22, 2017Bucks County, Montgomery County, Pennsylvania; 5 counties in New Jersey

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Aug 22, 2017, 10:27 PM EDT for Bucks County, Montgomery County, Pennsylvania; 5 counties in New Jersey. It was in force for 48 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 22, 2017, 10:27 PM EDT (02:27 UTC)
Expired: Aug 22, 2017, 11:15 PM EDT
In force: 48 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon
Tornado: Possible
Hail: 0.75 in
Wind: 70.0 mph

Counties Hunterdon County, NJ, Mercer County, NJ, Middlesex County, NJ, Monmouth County, NJ, Somerset County, NJ, Bucks County, PA, Montgomery County, PA

The radar

The Philadelphia radar (KDIX), 59 km from the middle of the area, began a volume at 02:31 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, 11:00 PM EDT	TSTM WND DMG	1 Ene Woodsville, NJ	TREE BLOWN DOWN ON TO NJ HIGHWAY 31. 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, 2.5 hours before the alert went out and 132 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.

470 
WUUS51 KPHI 230227
SVRPHI
NJC019-021-023-025-035-PAC017-091-230315-
/O.NEW.KPHI.SV.W.0188.170823T0227Z-170823T0315Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mount Holly NJ
1027 PM EDT TUE AUG 22 2017

The National Weather Service in Mount Holly NJ has issued a

* Severe Thunderstorm Warning for...
  Southeastern Hunterdon County in northwestern New Jersey...
  Mercer County in central New Jersey...
  Southern Somerset County in northern New Jersey...
  Northeastern Monmouth County in central New Jersey...
  Middlesex County in northern New Jersey...
  Northwestern Montgomery County in southeastern Pennsylvania...
  Central Bucks County in southeastern Pennsylvania...

* Until 1115 PM EDT

* At 1026 PM EDT, severe thunderstorms were located along a line
  extending from near Plainfield to near Belle Mead to Green Lane, 
  moving east at 20 mph. Wind damage has been reported in Hunterdon 
  and Somerset Counties in association with these storms.

  HAZARD...70 mph wind gusts and penny size hail. 

  SOURCE...Public. 

  IMPACT...Expect considerable tree damage. Damage is likely to 
           mobile homes, roofs, and outbuildings. 

* Locations impacted include...
  New Brunswick, Perth Amboy, Long Branch, Somerville, Sandy Hook,
  Somerset, Edison, Middletown, Old Bridge, East Brunswick, South
  Brunswick, Sayreville, North Brunswick, Marlboro, Ewing, Carteret,
  Tinton Falls, Holmdel, Middlesex and Princeton.

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 4026 7398 4026 7485 4033 7562 4053 7519
      4055 7461 4067 7446 4066 7440 4060 7446
      4059 7420 4056 7421 4055 7425 4050 7426
      4050 7428 4046 7426 4044 7420 4045 7413
      4041 7398 4048 7402 4048 7401 4043 7397
TIME...MOT...LOC 0226Z 273DEG 17KT 4066 7439 4044 7468 4034 7545 

TORNADO...POSSIBLE
HAIL...0.75IN
WIND...70MPH
 
$$

CMS

3 follow-up statements

820 
WWUS51 KPHI 230245
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
1045 PM EDT TUE AUG 22 2017

NJC019-021-023-025-035-PAC017-091-230315-
/O.CON.KPHI.SV.W.0188.000000T0000Z-170823T0315Z/
Hunterdon NJ-Mercer NJ-Somerset NJ-Monmouth NJ-Middlesex NJ-
Montgomery PA-Bucks PA-
1045 PM EDT TUE AUG 22 2017

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1115 PM EDT
FOR SOUTHEASTERN HUNTERDON...MERCER...SOUTHERN SOMERSET...
NORTHEASTERN MONMOUTH...MIDDLESEX...NORTHWESTERN MONTGOMERY AND
CENTRAL BUCKS COUNTIES...

At 1044 PM EDT, severe thunderstorms were located along a line
extending from near Todt Hill to near New Brunswick to near 
Souderton, moving east at 45 mph. Wind damage has been reported in 
Somerset, Hunterdon, and Morris Counties as these storms passed 
through.

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

SOURCE...Radar indicated. 

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

Locations impacted include...
New Brunswick, Perth Amboy, Long Branch, Somerville, Sandy Hook,
Somerset, Edison, Middletown, Old Bridge, East Brunswick, South
Brunswick, Sayreville, North Brunswick, Marlboro, Ewing, Carteret,
Tinton Falls, Holmdel, Middlesex and Princeton.

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 4026 7398 4026 7485 4033 7562 4053 7519
      4055 7461 4067 7446 4066 7440 4060 7446
      4059 7420 4056 7421 4055 7425 4050 7426
      4050 7428 4046 7426 4044 7420 4045 7413
      4041 7398 4048 7402 4048 7401 4043 7397
TIME...MOT...LOC 0244Z 262DEG 41KT 4060 7417 4047 7440 4034 7535 

TORNADO...POSSIBLE
HAIL...0.75IN
WIND...60MPH
 
$$

CMS

331 
WWUS51 KPHI 230306
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
1106 PM EDT TUE AUG 22 2017

NJC019-021-023-025-035-PAC017-091-230315-
/O.CON.KPHI.SV.W.0188.000000T0000Z-170823T0315Z/
Hunterdon NJ-Mercer NJ-Somerset NJ-Monmouth NJ-Middlesex NJ-
Montgomery PA-Bucks PA-
1106 PM EDT TUE AUG 22 2017

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1115 PM EDT
FOR SOUTHEASTERN HUNTERDON...MERCER...SOUTHERN SOMERSET...
NORTHEASTERN MONMOUTH...MIDDLESEX...NORTHWESTERN MONTGOMERY AND
CENTRAL BUCKS COUNTIES...

At 1106 PM EDT, severe thunderstorms were located along a line
extending from near Perth Amboy to Princeton to near Fricks, moving
east at 25 mph.

HAZARD...60 mph wind gusts. 

SOURCE...Radar indicated. 

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

Locations impacted include...
New Brunswick, Perth Amboy, Long Branch, Somerville, Sandy Hook,
Somerset, Edison, Middletown, Old Bridge, East Brunswick, South
Brunswick, Sayreville, North Brunswick, Marlboro, Ewing, Carteret,
Tinton Falls, Holmdel, Middlesex and Princeton.

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 4026 7398 4026 7485 4033 7562 4053 7519
      4055 7461 4067 7446 4066 7440 4060 7446
      4059 7421 4056 7421 4055 7425 4050 7426
      4050 7428 4046 7426 4041 7398 4048 7402
      4048 7401 4043 7397
TIME...MOT...LOC 0306Z 288DEG 21KT 4053 7431 4035 7468 4034 7522 

TORNADO...POSSIBLE
HAIL...<.75IN
WIND...60MPH
 
$$

CMS

410 
WWUS51 KPHI 230313
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
1113 PM EDT TUE AUG 22 2017

NJC019-021-023-025-035-PAC017-091-230323-
/O.EXP.KPHI.SV.W.0188.000000T0000Z-170823T0315Z/
Hunterdon NJ-Mercer NJ-Somerset NJ-Monmouth NJ-Middlesex NJ-
Montgomery PA-Bucks PA-
1113 PM EDT TUE AUG 22 2017

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN HUNTERDON...
MERCER...SOUTHERN SOMERSET...NORTHEASTERN MONMOUTH...MIDDLESEX...
NORTHWESTERN MONTGOMERY AND CENTRAL BUCKS COUNTIES WILL EXPIRE AT
1115 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 midnight EDT for
central, northern and northwestern New Jersey...and southeastern
Pennsylvania.

LAT...LON 4026 7398 4026 7485 4033 7562 4053 7519
      4055 7461 4067 7446 4066 7440 4060 7446
      4059 7421 4056 7421 4055 7425 4050 7426
      4050 7428 4046 7426 4041 7398 4048 7402
      4048 7401 4043 7397
TIME...MOT...LOC 0313Z 273DEG 17KT 4053 7427 4035 7464 4034 7518 

$$

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	Monroe, Northampton	48 min
Aug 22, 8:15 PM EDT	Tornado Warning	PHI	Monroe, Northampton	30 min
Aug 22, 8:45 PM EDT	Severe Thunderstorm Warning	PHI	Berks, Bucks, Carbon, Chester, Lehigh, Monroe and 2 more	60 min
Aug 22, 8:58 PM EDT	Severe Thunderstorm Warning	PHI	Monroe, Northampton	24 min
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
Aug 22, 9:42 PM EDT	Severe Thunderstorm Warning	PHI	Bucks, Montgomery	48 min
Aug 22, 10:07 PM EDT	Severe Thunderstorm Warning	PHI	Berks, Bucks, Chester, Delaware, Montgomery, Philadelphia	53 min
Aug 22, 10:37 PM EDT	Areal Flood Advisory	PHI	Berks, Bucks, Lehigh, Montgomery, Northampton	4 hr
Aug 22, 10:40 PM EDT	Areal Flood Advisory	PHI	Berks, Bucks, Chester, Delaware, Montgomery, Philadelphia	4 hr
Aug 22, 10:58 PM EDT	Severe Thunderstorm Warning	PHI	Bucks, Chester, Delaware, Montgomery, Philadelphia	62 min
Aug 22, 11:46 PM EDT	Severe Thunderstorm Warning	PHI	Chester, Delaware, Montgomery, Philadelphia	44 min
Aug 23, 12:06 AM EDT	Flash Flood Warning	PHI	Chester, Delaware, Montgomery, Philadelphia	4 hr
Aug 23, 12:29 AM EDT	Severe Thunderstorm Warning	PHI	Philadelphia	46 min
Aug 23, 4:02 AM EDT	Areal Flood Warning	PHI	Chester, Delaware, Philadelphia	4 hr
Aug 22, 8:20 PM EDT	Special Weather Statement	PHI	Sussex	40 min
Aug 22, 10:13 PM EDT	Special Marine Warning	PHI		92 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 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

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.