Alert archive / New Jersey / Severe Thunderstorm Warnings in 2020

Severe Thunderstorm Warning 21, NWS Philadelphia/Mount Holly

April 9, 20206 counties in New Jersey; Bucks County, Pennsylvania

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Apr 9, 2020, 1:23 PM EDT for 6 counties in New Jersey; Bucks County, Pennsylvania. It was in force for 52 min. 15 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: Apr 9, 2020, 1:23 PM EDT (17:23 UTC)
Expired: Apr 9, 2020, 2:15 PM EDT
In force: 52 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

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

The radar

The Philadelphia radar (KDIX), 55 km from the middle of the area, began a volume at 17:25 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
Apr 9, 1:24 PM EDT	HAIL 0.25	Hopewell, NJ
Apr 9, 1:27 PM EDT	TSTM WND GST 45	Trenton Mercer Airport, NJ	KTTN MEASURED 39 KT WIND GUST.
Apr 9, 1:30 PM EDT	TSTM WND DMG	3 Ese Montgomery Twp, NJ	LARGE SPRUCE TREE DOWN ACROSS DRIVEWAY. TIME ESTIMATED FROM RADAR.
Apr 9, 1:35 PM EDT	HAIL 0.7	1 Ssw Plainsboro Townsh, NJ	HAIL UP TO DIME SIZE REPORTED IN PLAINSBORO.
Apr 9, 1:35 PM EDT	HAIL 0.88	2 Wsw Heathcote, NJ	DIME TO NICKEL SIZE HAIL REPORTED IN KINGSTON. TIME ESTIMATED FROM RADAR.
Apr 9, 1:36 PM EDT	TSTM WND DMG	1 Nne Watchung, NJ	PARLIN LANE CLOSED DUE TO DOWN TREES AND WIRES. TIME ESTIMATED FROM RADAR.
Apr 9, 1:36 PM EDT	TSTM WND DMG	South Brunswick, NJ	PHOTOS OF TREES AND POWER POLES DOWNED ON SOCIAL MEDIA. TIME ESTIMATED FROM RADAR.
Apr 9, 1:42 PM EDT	TSTM WND DMG	Edison, NJ	TREES AND WIRES REPORTED DOWN IN EDISON AND METUCHEN. TIME ESTIMATED FROM RADAR.
Apr 9, 1:42 PM EDT	HAIL 1	Hillsborough Twp, NJ	MOSTLY PEA SIZE WITH A FEW STONES TO QUARTER SIZE. TIME ESTIMATED FROM RADAR.
Apr 9, 1:43 PM EDT	HAIL 0.75	1 W Concordia, NJ	REPORT FROM MPING: DIME (0.75 IN.).
Apr 9, 1:44 PM EDT	HAIL 0.25	Edison, NJ
Apr 9, 1:45 PM EDT	HAIL 0.25	Robbinsville Twp., NJ
Apr 9, 1:52 PM EDT	TSTM WND GST 63	Port Reading, NJ
Apr 9, 2:12 PM EDT	TSTM WND DMG	1 Wsw Asbury Park, NJ	LARGE TREE DOWN INTO A HOME ON HECK AVE IN NEPTUNE. HECK AVE IS CLOSED BETWEEN FISHER AND MYRTLE. TIME ESTIMATED FROM RADAR.
Apr 9, 2:15 PM EDT	TSTM WND DMG	1 Wsw Asbury Park, NJ	PHOTO SHOWS A LARGE TREE FALLEN ONTO A RESIDENCE. NO INJURIES REPORTED. 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
Apr 9, 12:01 PM EDT	Severe Thunderstorm Watch	SPC	4 hr

The nearest sounding before it

Brookhaven, NY (KOKX), launched 12:00Z, 5.4 hours before the alert went out and 136 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 942 m above ground
0-6 km bulk shear: 47 kt
0-1 km storm-relative helicity: 241 m²/s²
0-3 km storm-relative helicity: 361 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

478 
WUUS51 KPHI 091723
SVRPHI
NJC019-021-023-025-027-035-PAC017-091815-
/O.NEW.KPHI.SV.W.0021.200409T1723Z-200409T1815Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mount Holly NJ
123 PM EDT Thu Apr 9 2020

The National Weather Service in Mount Holly NJ has issued a

* Severe Thunderstorm Warning for...
  Southeastern Morris County in northern New Jersey...
  Southeastern Hunterdon County in northwestern New Jersey...
  Mercer County in central New Jersey...
  Somerset County in northern New Jersey...
  Monmouth County in central New Jersey...
  Middlesex County in northern New Jersey...
  Southeastern Bucks County in southeastern Pennsylvania...

* Until 215 PM EDT.

* At 123 PM EDT, severe thunderstorms were located along a line
  extending from near Bridgewater to Pennington to Langhorne, moving
  east at 70 mph.

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

  SOURCE...Radar indicated.

  IMPACT...Damage to roofs, siding, trees, and power lines is 
           possible.

* Locations impacted include...
  Trenton, New Brunswick, Perth Amboy, Long Branch, Asbury Park,
  Somerville, Sandy Hook, Somerset, Edison, Middletown, Old Bridge,
  Howell, East Brunswick, Bridgewater, South Brunswick, Sayreville,
  North Brunswick, Marlboro, Manalapan and Ewing.

People attending Covid-19 Drive through testing should seek safe
shelter immediately!

This includes the following highways...
 Garden State Parkway between mile markers 100 and 134.
 Interstate 195 in New Jersey between mile markers 0 and 8.
 Interstate 287 in New Jersey between mile markers 0 and 30.
 Interstate 295 in New Jersey between mile markers 60 and 76.
 Interstate 78 in New Jersey between mile markers 23 and 42.
 New Jersey Turnpike between exits 8A and 13.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

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.

&&

LAT...LON 4018 7396 4019 7470 4017 7471 4014 7503
      4015 7503 4033 7487 4070 7479 4077 7437
      4074 7437 4067 7446 4065 7441 4060 7446
      4060 7421 4056 7421 4050 7428 4047 7427
      4041 7398 4042 7398 4048 7402 4043 7397
TIME...MOT...LOC 1723Z 262DEG 61KT 4064 7470 4035 7477 4018 7493 

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

MPS

2 follow-up statements

176 
WWUS51 KPHI 091747
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
147 PM EDT Thu Apr 9 2020

NJC019-027-035-PAC017-091757-
/O.CAN.KPHI.SV.W.0021.000000T0000Z-200409T1815Z/
Morris NJ-Hunterdon NJ-Somerset NJ-Bucks PA-
147 PM EDT Thu Apr 9 2020

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN MORRIS...
SOUTHEASTERN HUNTERDON...SOMERSET AND SOUTHEASTERN BUCKS COUNTIES IS
CANCELLED...

The storms which prompted the warning have moved out of the warned 
area. Therefore, the warning has been cancelled.

A Severe Thunderstorm Watch remains in effect until 400 PM EDT for
central and northern New Jersey.

LAT...LON 4018 7398 4019 7460 4037 7447 4060 7439
      4060 7421 4056 7421 4055 7425 4053 7425
      4050 7428 4047 7427 4044 7420 4045 7418
      4041 7398 4046 7400 4043 7397
TIME...MOT...LOC 1747Z 263DEG 59KT 4067 7426 4038 7433 4022 7450 

$$

NJC021-023-025-091815-
/O.CON.KPHI.SV.W.0021.000000T0000Z-200409T1815Z/
Mercer NJ-Monmouth NJ-Middlesex NJ-
147 PM EDT Thu Apr 9 2020

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 215 PM EDT
FOR SOUTHEASTERN MERCER...MONMOUTH AND MIDDLESEX COUNTIES...

At 147 PM EDT, severe thunderstorms were located along a line
extending from Union to Old Bridge to Roosevelt, moving east at 70
mph.

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

SOURCE...Radar indicated.

IMPACT...Damage to roofs, siding, trees, and power lines is 
         possible.

Locations impacted include...
New Brunswick, Perth Amboy, Long Branch, Asbury Park, Sandy Hook,
Edison, Middletown, Old Bridge, Howell, East Brunswick, Sayreville,
Marlboro, Manalapan, Carteret, Tinton Falls, Holmdel, Red Bank,
Matawan, Jamesburg and Hightstown.

People attending Covid-19 Drive through testing should seek safe
shelter immediately!

This includes the following highways...
 Garden State Parkway between mile markers 100 and 134.
 Interstate 287 in New Jersey between mile markers 0 and 4.
 New Jersey Turnpike between exits 8A and 13.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

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.

&&

LAT...LON 4018 7398 4019 7460 4037 7447 4060 7439
      4060 7421 4056 7421 4055 7425 4053 7425
      4050 7428 4047 7427 4044 7420 4045 7418
      4041 7398 4046 7400 4043 7397
TIME...MOT...LOC 1747Z 263DEG 59KT 4067 7426 4038 7433 4022 7450 

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

MPS

388 
WWUS51 KPHI 091809
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
209 PM EDT Thu Apr 9 2020

NJC021-023-025-091819-
/O.EXP.KPHI.SV.W.0021.000000T0000Z-200409T1815Z/
Mercer NJ-Monmouth NJ-Middlesex NJ-
209 PM EDT Thu Apr 9 2020

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN MERCER...MONMOUTH
AND MIDDLESEX COUNTIES WILL EXPIRE AT 215 PM EDT...
    
The storms which prompted the warning have moved out of the area.
Therefore, the warning will be allowed to expire.  However gusty
winds are still possible with these thunderstorms.

A Severe Thunderstorm Watch remains in effect until 400 PM EDT for
central and northern New Jersey.

To report severe weather, contact your nearest law enforcement
agency. They will relay your report to the National Weather Service
Mount Holly NJ.

LAT...LON 4018 7398 4019 7460 4037 7447 4060 7439
      4060 7421 4056 7421 4055 7425 4053 7425
      4050 7428 4047 7427 4044 7420 4045 7418
      4041 7398 4046 7400 4043 7397
TIME...MOT...LOC 1809Z 262DEG 61KT 4072 7377 4043 7385 4027 7402 

$$

MPS

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 9, 9:57 AM EDT	Special Marine Warning	PHI		63 min
Apr 9, 10:56 AM EDT	Special Marine Warning	PHI		29 min
Apr 9, 12:05 PM EDT	Special Weather Statement	PHI	Warren	40 min
Apr 9, 12:52 PM EDT	Special Weather Statement	PHI	Hunterdon, Morris, Somerset, Sussex, Warren	23 min
Apr 9, 1:00 PM EDT	Severe Thunderstorm Warning	PHI	Hunterdon, Mercer, Middlesex, Morris, Somerset, Warren	45 min
Apr 9, 1:12 PM EDT	Severe Thunderstorm Warning	PHI	Camden, Gloucester, Salem	48 min
Apr 9, 1:14 PM EDT	Special Weather Statement	PHI	Morris	31 min
Apr 9, 1:18 PM EDT	Special Weather Statement	PHI	Cumberland	27 min
Apr 9, 1:30 PM EDT	Special Marine Warning	PHI		60 min
Apr 9, 1:33 PM EDT	Severe Thunderstorm Warning	PHI	Atlantic, Burlington, Camden, Gloucester, Mercer, Monmouth and 2 more	42 min
Apr 9, 1:44 PM EDT	Special Marine Warning	PHI		61 min
Apr 9, 2:08 PM EDT	Severe Thunderstorm Warning	PHI	Atlantic, Burlington, Monmouth, Ocean	30 min
Apr 9, 2:13 PM EDT	Special Marine Warning	PHI		33 min
Apr 9, 3:13 PM EDT	Coastal Flood Statement	PHI	Ocean	4 hr
Apr 9, 3:32 PM EDT	Wind Advisory	PHI	Atlantic, Burlington, Camden, Cape May, Cumberland, Gloucester and 10 more	27 hr
Apr 9, 12:23 PM EDT	Severe Thunderstorm Warning	PHI	Berks, Bucks, Chester, Lehigh, Montgomery	52 min
Apr 9, 1:26 PM EDT	Severe Thunderstorm Warning	PHI	Berks, Bucks, Chester, Delaware, Montgomery, Philadelphia	49 min

Nearby

Severe Thunderstorm Warnings in New Jersey, 2020 Severe Thunderstorm Warnings in Pennsylvania, 2020 Every severe thunderstorm warning in 2020

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.