Alert archive / New Jersey / Severe Thunderstorm Warnings in 2019

Severe Thunderstorm Warning 233, NWS Philadelphia/Mount Holly

July 17, 2019Middlesex County, Monmouth County, Somerset County, New Jersey

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Jul 17, 2019, 8:50 PM EDT for Middlesex County, Monmouth County, Somerset County, New Jersey. It was in force for 40 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: Jul 17, 2019, 8:50 PM EDT (00:50 UTC)
Expired: Jul 17, 2019, 9:30 PM EDT
In force: 40 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Middlesex County, NJ, Monmouth County, NJ, Somerset County, NJ

The radar

The Philadelphia radar (KDIX), 64 km from the middle of the area, began a volume at 00:50 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
Jul 17, 8:55 PM EDT	TSTM WND DMG	1 Ssw Heathcote, NJ	DOWNED TREE BLOCKING A LANE ON US-1 NORTHBOUND AT RAYMOND RD. 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
Jul 17, 1:58 PM EDT	Severe Thunderstorm Watch	SPC	8 hr

The nearest sounding before it

Brookhaven, NY (KOKX), launched 00:00Z, 0.8 hours before the alert went out and 131 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: 1392 J/kg
Mixed-layer CIN: -88 J/kg
Mixed-layer LCL: 975 m above ground
0-6 km bulk shear: 34 kt
0-1 km storm-relative helicity: 106 m²/s²
0-3 km storm-relative helicity: 133 m²/s²
Significant tornado parameter: 0.4
Supercell composite: 4.0

Open this sounding in Storm Lab

The text

As transmitted.

126 
WUUS51 KPHI 180050
SVRPHI
NJC023-025-035-180130-
/O.NEW.KPHI.SV.W.0233.190718T0050Z-190718T0130Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mount Holly NJ
850 PM EDT Wed Jul 17 2019

The National Weather Service in Mount Holly NJ has issued a

* Severe Thunderstorm Warning for...
  Central Somerset County in northern New Jersey...
  Northern Monmouth County in central New Jersey...
  Middlesex County in northern New Jersey...

* Until 930 PM EDT.

* At 850 PM EDT, a severe thunderstorm was located over East
  Brunswick, or near New Brunswick, moving northeast at 40 mph.

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

  SOURCE...Radar indicated.

  IMPACT...Minor damage to vehicles is possible. Wind damage to 
           roofs, siding, trees, and power lines is possible.

* Locations impacted include...
  New Brunswick, Perth Amboy, Somerville, Somerset, Edison, Old
  Bridge, East Brunswick, South Brunswick, Sayreville, North
  Brunswick, Carteret, Middlesex, Bound Brook, Manville, Keansburg,
  Matawan, Jamesburg, Cranbury, Millstone and Brownville.

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.

Torrential rainfall is occurring with this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.

&&

LAT...LON 4032 7452 4049 7470 4067 7447 4066 7445
      4066 7440 4063 7442 4060 7446 4060 7421
      4056 7421 4055 7425 4050 7426 4050 7428
      4047 7427 4044 7420 4046 7418 4045 7412
TIME...MOT...LOC 0050Z 245DEG 36KT 4043 7440 

HAIL...1.00IN
WIND...60MPH
 
$$

Staarmann

2 follow-up statements

706 
WWUS51 KPHI 180115
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
915 PM EDT Wed Jul 17 2019

NJC023-025-035-180130-
/O.CON.KPHI.SV.W.0233.000000T0000Z-190718T0130Z/
Somerset NJ-Monmouth NJ-Middlesex NJ-
915 PM EDT Wed Jul 17 2019

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 930 PM EDT
FOR SOUTHEASTERN SOMERSET...NORTHERN MONMOUTH AND MIDDLESEX
COUNTIES...

At 914 PM EDT, a severe thunderstorm was located over Huguenot, 
moving northeast at 40 mph. Another line of storms was located near 
Spotswood moving northeast at 40 mph.

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

SOURCE...Radar indicated.

IMPACT...Minor damage to vehicles is possible. Wind damage to roofs, 
         siding, trees, and power lines is possible.

Locations impacted include...
New Brunswick, Perth Amboy, Somerville, Somerset, Edison, Old Bridge,
East Brunswick, Sayreville, North Brunswick, Carteret, Middlesex,
Bound Brook, Manville, Keansburg, Matawan, Jamesburg, Millstone,
Colonia, Brownville and Dayton.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Continuous cloud to ground lightning is occurring with this storm.
Move indoors immediately. Lightning is one of nature's leading
killers. Remember, if you can hear thunder, you are close enough to
be struck by lightning.

Torrential rainfall is occurring with this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.

&&

LAT...LON 4033 7449 4056 7461 4067 7447 4066 7445
      4066 7440 4063 7442 4060 7446 4060 7421
      4056 7421 4055 7425 4050 7426 4050 7428
      4047 7427 4044 7420 4046 7418 4045 7412
TIME...MOT...LOC 0114Z 241DEG 33KT 4055 7419 

HAIL...1.00IN
WIND...60MPH
 
$$

Staarmann

162 
WWUS51 KPHI 180126
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
926 PM EDT Wed Jul 17 2019

NJC023-025-035-180134-
/O.EXP.KPHI.SV.W.0233.000000T0000Z-190718T0130Z/
Somerset NJ-Monmouth NJ-Middlesex NJ-
926 PM EDT Wed Jul 17 2019

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN SOMERSET...
NORTHERN MONMOUTH AND MIDDLESEX COUNTIES WILL EXPIRE AT 930 PM EDT...
        
The storm which prompted the warning has weakened below severe 
limits, and will be moving out of the warned area. Therefore, the 
warning will be allowed to expire.  However gusty winds and heavy 
rain are still possible with this thunderstorm.

A severe thunderstorm watch remains in effect until 1000 PM EDT for
northern and central New Jersey.

Remember, a Severe Thunderstorm Warning still remains in effect for
Monmouth County until 1000 PM EDT.

LAT...LON 4033 7449 4056 7461 4067 7447 4066 7445
      4066 7440 4063 7442 4060 7446 4060 7421
      4056 7421 4055 7425 4050 7426 4050 7428
      4047 7427 4044 7420 4046 7418 4045 7412
TIME...MOT...LOC 0124Z 245DEG 36KT 4058 7410 

$$

Staarmann

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 17, 8:01 PM EDT	Areal Flood Advisory	PHI	Warren	88 min
Jul 17, 8:10 PM EDT	Special Marine Warning	PHI		95 min
Jul 17, 8:15 PM EDT	Severe Thunderstorm Warning	PHI	Atlantic, Burlington, Camden, Gloucester, Hunterdon, Mercer and 1 more	45 min
Jul 17, 8:39 PM EDT	Areal Flood Advisory	PHI	Morris, Sussex	3 hr
Jul 17, 8:40 PM EDT	Special Weather Statement	PHI	Atlantic, Burlington, Mercer, Middlesex, Monmouth, Ocean	65 min
Jul 17, 8:43 PM EDT	Special Marine Warning	PHI		92 min
Jul 17, 8:55 PM EDT	Areal Flood Advisory	PHI	Mercer, Middlesex, Somerset	49 min
Jul 17, 9:02 PM EDT	Flash Flood Warning	PHI	Mercer, Middlesex, Somerset	3 hr
Jul 17, 9:19 PM EDT	Severe Thunderstorm Warning	PHI	Middlesex, Monmouth, Ocean	41 min
Jul 17, 9:44 PM EDT	Special Marine Warning	PHI		61 min
Jul 17, 10:41 PM EDT	Special Marine Warning	PHI		49 min
Jul 17, 11:12 PM EDT	Areal Flood Warning	PHI	Somerset	3 hr
Jul 18, 1:30 PM EDT	Areal Flood Advisory	PHI	Gloucester	4 hr
Jul 18, 2:13 PM EDT	Areal Flood Advisory	PHI	Burlington, Camden, Gloucester, Ocean	4 hr
Jul 18, 2:24 PM EDT	Areal Flood Advisory	PHI	Salem	3 hr
Jul 18, 2:47 PM EDT	Flash Flood Warning	PHI	Burlington, Ocean	4 hr
Jul 18, 3:48 PM EDT	Areal Flood Advisory	PHI	Burlington, Mercer, Middlesex, Monmouth, Ocean	4 hr
Jul 18, 3:59 PM EDT	Areal Flood Advisory	PHI	Atlantic, Burlington, Camden, Gloucester, Ocean, Salem	3 hr
Jul 18, 4:19 PM EDT	Flash Flood Warning	PHI	Atlantic, Burlington, Ocean	3 hr
Jul 18, 4:30 PM EDT	Areal Flood Advisory	PHI	Hunterdon	4 hr
Jul 18, 4:52 PM EDT	Special Marine Warning	PHI		53 min
Jul 18, 4:53 PM EDT	Areal Flood Advisory	PHI	Mercer, Middlesex, Monmouth, Somerset	4 hr
Jul 18, 4:56 PM EDT	Areal Flood Advisory	PHI	Cumberland, Gloucester, Salem	3 hr
Jul 18, 5:13 PM EDT	Flash Flood Warning	PHI	Mercer, Middlesex, Monmouth, Somerset	3 hr
Jul 18, 5:57 PM EDT	Areal Flood Advisory	PHI	Cumberland, Salem	2 hr
Jul 18, 6:01 PM EDT	Flash Flood Warning	PHI	Hunterdon, Middlesex, Somerset	4 hr

Nearby

Severe Thunderstorm Warnings in New Jersey, 2019 Every severe thunderstorm warning in 2019

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.