Alert archive / New Jersey / Severe Thunderstorm Warnings in 2026

Severe Thunderstorm Warning 47, NWS Philadelphia/Mount Holly

May 20, 20265 counties in New Jersey

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at May 20, 2026, 6:04 PM EDT for 5 counties in New Jersey. It was in force for 56 min. 7 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: May 20, 2026, 6:04 PM EDT (22:04 UTC)
Expired: May 20, 2026, 7:00 PM EDT
In force: 56 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon
Damage threat: Considerable
Hail: 0.75 in
Wind: 70.0 mph

Counties Hunterdon County, NJ, Middlesex County, NJ, Monmouth County, NJ, Morris County, NJ, Somerset County, NJ

The radar

The Philadelphia radar (KDIX), 66 km from the middle of the area, began a volume at 22:06 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
May 20, 6:11 PM EDT	TSTM WND DMG	Piscataway, NJ	Social media image of a large tree limb down. Time approximate from KDIX radar.
May 20, 6:11 PM EDT	TSTM WND DMG	Piscataway, NJ	Social media image of a large tree limb down. Time approximate from KDIX radar.
May 20, 6:30 PM EDT	TSTM WND DMG	Edison, NJ	Social media images of several large tree limbs down as well as some trees across Edison and Metuchen. Time approximate from KDIX radar.
May 20, 6:30 PM EDT	TSTM WND DMG	Edison, NJ	Social media images of several large tree limbs down as well as some trees across Edison and Metuchen. Time approximate from KDIX radar.
May 20, 6:45 PM EDT	TSTM WND DMG	1 Ene Centerville, NJ	Wires down and snapped telephone poles on Plum Lane in Holmdel NJ.
May 20, 6:45 PM EDT	TSTM WND DMG	1 Ene Centerville, NJ	Wires down and snapped telephone poles on Plum Lane in Holmdel NJ.
May 20, 6:48 PM EDT	TSTM WND DMG	1 W Middletown Twp, NJ	Swath of trees and wires down in Middletown Township. 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
May 20, 2:10 PM EDT	Severe Thunderstorm Watch	SPC	7 hr

The nearest sounding before it

Brookhaven, NY (KOKX), launched 12:00Z, 10.1 hours before the alert went out and 123 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: 31 J/kg
Mixed-layer CIN: -279 J/kg
Mixed-layer LCL: 1524 m above ground
0-6 km bulk shear: 19 kt
0-1 km storm-relative helicity: 90 m²/s²
0-3 km storm-relative helicity: 80 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

329 
WUUS51 KPHI 202204
SVRPHI
NJC019-023-025-027-035-202300-
/O.NEW.KPHI.SV.W.0047.260520T2204Z-260520T2300Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mount Holly NJ
604 PM EDT Wed May 20 2026

The National Weather Service in Mount Holly NJ has issued a

* Severe Thunderstorm Warning for...
  Southeastern Hunterdon County in northwestern New Jersey...
  Southeastern Morris County in northern New Jersey...
  Somerset County in northern New Jersey...
  Northeastern Monmouth County in central New Jersey...
  Middlesex County in northern New Jersey...

* Until 700 PM EDT.

* At 604 PM EDT, a severe thunderstorm was located over Manville, or
  near Somerville, moving east at 30 mph.

  HAZARD...70 mph wind gusts.

  SOURCE...Radar indicated.

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

* Locations impacted include...
  New Brunswick, Perth Amboy, Somerville, Sandy Hook, Somerset,
  Edison, Middletown, Old Bridge, East Brunswick, Bridgewater, South
  Brunswick, Sayreville, North Brunswick, Carteret, Madison,
  Middlesex, Red Bank, Bound Brook, Manville, and Keansburg.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4035 7397 4042 7480 4074 7477 4077 7437
      4074 7437 4067 7446 4065 7440 4060 7446
      4060 7421 4056 7421 4055 7425 4050 7428
      4047 7427 4044 7420 4046 7418 4045 7413
      4041 7399 4048 7402 4047 7400 4043 7397
TIME...MOT...LOC 2204Z 272DEG 25KT 4053 7455 

THUNDERSTORM DAMAGE THREAT...CONSIDERABLE
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...70 MPH

$$

Fitzsimmons

2 follow-up statements

356 
WWUS51 KPHI 202227
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
627 PM EDT Wed May 20 2026

NJC019-202236-
/O.CAN.KPHI.SV.W.0047.000000T0000Z-260520T2300Z/
Hunterdon NJ-
627 PM EDT Wed May 20 2026

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN HUNTERDON COUNTY
IS CANCELLED...

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

A Severe Thunderstorm Watch remains in effect until 900 PM EDT for
northern and central New Jersey.

LAT...LON 4041 7465 4075 7461 4077 7437 4074 7437
      4067 7446 4064 7441 4060 7446 4060 7421
      4056 7421 4050 7428 4047 7427 4044 7420
      4046 7418 4045 7414 4041 7399 4048 7402
      4048 7401 4043 7397 4038 7397
TIME...MOT...LOC 2226Z 272DEG 25KT 4052 7434 

$$

NJC023-025-027-035-202300-
/O.CON.KPHI.SV.W.0047.000000T0000Z-260520T2300Z/
Morris NJ-Somerset NJ-Monmouth NJ-Middlesex NJ-
627 PM EDT Wed May 20 2026

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 700 PM EDT
FOR SOUTHEASTERN MORRIS...CENTRAL SOMERSET...NORTHEASTERN MONMOUTH
AND MIDDLESEX COUNTIES...

At 626 PM EDT, a severe thunderstorm was located over Edison, or near
Perth Amboy, moving east at 30 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, Somerville, Sandy Hook, Somerset, Edison,
Middletown, Old Bridge, East Brunswick, Sayreville, North Brunswick,
Carteret, Madison, Middlesex, Bound Brook, Manville, Chatham,
Matawan, Highlands, and Mendham.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4041 7465 4075 7461 4077 7437 4074 7437
      4067 7446 4064 7441 4060 7446 4060 7421
      4056 7421 4050 7428 4047 7427 4044 7420
      4046 7418 4045 7414 4041 7399 4048 7402
      4048 7401 4043 7397 4038 7397
TIME...MOT...LOC 2226Z 272DEG 25KT 4052 7434 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...0.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

Fitzsimmons

262 
WWUS51 KPHI 202247
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
647 PM EDT Wed May 20 2026

NJC027-035-202257-
/O.CAN.KPHI.SV.W.0047.000000T0000Z-260520T2300Z/
Morris NJ-Somerset NJ-
647 PM EDT Wed May 20 2026

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

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

A Severe Thunderstorm Watch remains in effect until 900 PM EDT for
northern and central New Jersey.

LAT...LON 4041 7442 4060 7441 4060 7421 4056 7421
      4055 7425 4053 7425 4050 7428 4047 7427
      4044 7420 4046 7418 4041 7399 4048 7402
      4048 7401 4043 7397 4038 7397
TIME...MOT...LOC 2247Z 272DEG 25KT 4051 7415 

$$

NJC023-025-202300-
/O.CON.KPHI.SV.W.0047.000000T0000Z-260520T2300Z/
Monmouth NJ-Middlesex NJ-
647 PM EDT Wed May 20 2026

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 700 PM EDT
FOR NORTHEASTERN MONMOUTH AND NORTHEASTERN MIDDLESEX COUNTIES...

At 647 PM EDT, a severe thunderstorm was located over Huguenot,
moving east at 30 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, Sandy Hook, Edison, Middletown, Old
Bridge, East Brunswick, Sayreville, Carteret, Matawan, Highlands,
Colonia, Navesink, Brownville, Woodbridge, South River, Highland
Park, Metuchen, Spotswood, and Keyport.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4041 7442 4060 7441 4060 7421 4056 7421
      4055 7425 4053 7425 4050 7428 4047 7427
      4044 7420 4046 7418 4041 7399 4048 7402
      4048 7401 4043 7397 4038 7397
TIME...MOT...LOC 2247Z 272DEG 25KT 4051 7415 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...0.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

Fitzsimmons

The office that day

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

Issued	Product	Office	Counties	Lasted
May 20, 2:25 PM EDT	Small Craft Advisory	PHI		3 days
May 20, 4:43 PM EDT	Severe Thunderstorm Warning	PHI	Hunterdon, Warren	47 min
May 20, 5:01 PM EDT	Special Marine Warning	PHI		86 min
May 20, 5:10 PM EDT	Severe Thunderstorm Warning	PHI	Camden, Gloucester	50 min
May 20, 5:15 PM EDT	Severe Thunderstorm Warning	PHI	Burlington, Hunterdon, Mercer, Somerset	45 min
May 20, 5:24 PM EDT	Severe Thunderstorm Warning	PHI	Hunterdon, Middlesex, Morris, Somerset, Warren	51 min
May 20, 5:29 PM EDT	Severe Thunderstorm Warning	PHI	Camden, Gloucester, Salem	46 min
May 20, 5:35 PM EDT	Severe Thunderstorm Warning	PHI	Salem	40 min
May 20, 5:40 PM EDT	Flash Flood Warning	PHI	Burlington, Camden, Gloucester	3 hr
May 20, 5:41 PM EDT	Severe Thunderstorm Warning	PHI	Burlington, Mercer, Monmouth, Ocean	49 min
May 20, 5:52 PM EDT	Severe Thunderstorm Warning	PHI	Burlington, Hunterdon, Mercer, Middlesex, Monmouth, Ocean and 1 more	38 min
May 20, 6:01 PM EDT	Severe Thunderstorm Warning	PHI	Burlington, Camden, Gloucester	44 min
May 20, 6:07 PM EDT	Special Marine Warning	PHI		53 min
May 20, 6:09 PM EDT	Severe Thunderstorm Warning	PHI	Atlantic, Burlington, Camden, Gloucester, Ocean	46 min
May 20, 6:12 PM EDT	Severe Thunderstorm Warning	PHI	Ocean	33 min
May 20, 6:17 PM EDT	Special Marine Warning	PHI		118 min
May 20, 6:23 PM EDT	Severe Thunderstorm Warning	PHI	Burlington, Mercer, Middlesex, Monmouth, Ocean, Somerset	56 min
May 20, 6:58 PM EDT	Severe Thunderstorm Warning	PHI	Ocean	32 min
May 20, 7:30 PM EDT	Special Marine Warning	PHI		90 min

Nearby

Severe Thunderstorm Warnings in New Jersey, 2026 Every severe thunderstorm warning in 2026

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.