Alert archive / New Jersey / Severe Thunderstorm Warnings in 2020

Severe Thunderstorm Warning 183, NWS Philadelphia/Mount Holly

July 24, 20205 counties in New Jersey; Bucks County, Pennsylvania

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Jul 24, 2020, 1:13 AM EDT for 5 counties in New Jersey; Bucks County, Pennsylvania. It was in force for 62 min. 3 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: Jul 24, 2020, 1:13 AM EDT (05:13 UTC)
Expired: Jul 24, 2020, 2:15 AM EDT
In force: 62 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, Somerset County, NJ, Bucks County, PA

The radar

The Philadelphia radar (KDIX), 51 km from the middle of the area, began a volume at 05:16 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 24, 1:24 AM EDT	MARINE TSTM WIND 49	8 S Seagate, NY	SANDY HOOK STATION MEASURED WIND GUST OF 42.9 KTS
Jul 24, 1:24 AM EDT	MARINE TSTM WIND 49	Sandy Hook, NJ
Jul 24, 1:50 AM EDT	TSTM WND DMG	2 Ssw North Brunswick, NJ	DOWNED TREE NEAR STONY BROOK WAY. TIME ESTIMATED FROM RADAR.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Brookhaven, NY (KOKX), launched 00:00Z, 5.2 hours before the alert went out and 128 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: 1702 J/kg
Mixed-layer CIN: -49 J/kg
Mixed-layer LCL: 797 m above ground
0-6 km bulk shear: 20 kt
0-1 km storm-relative helicity: 111 m²/s²
0-3 km storm-relative helicity: 116 m²/s²
Significant tornado parameter: 0.6
Supercell composite: 4.0

Open this sounding in Storm Lab

The text

As transmitted.

237 
WUUS51 KPHI 240513
SVRPHI
NJC019-021-023-025-035-PAC017-240615-
/O.NEW.KPHI.SV.W.0183.200724T0513Z-200724T0615Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mount Holly NJ
113 AM EDT Fri Jul 24 2020

The National Weather Service in Mount Holly NJ has issued a

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

* Until 215 AM EDT.

* At 113 AM EDT, a severe thunderstorm was located over Plainsboro
  Center, or 10 miles northeast of Trenton, moving east at 10 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, Long Branch, Asbury Park, Sandy Hook,
  Somerset, Middletown, Old Bridge, East Brunswick, South Brunswick,
  Sayreville, North Brunswick, Marlboro, Manalapan, Ewing, Tinton
  Falls, Holmdel, Princeton, Red Bank and Keansburg.

This includes the following highways...
 New Jersey Turnpike between exits 8A and 10.
 Interstate 295 in New Jersey between mile markers 63 and 76.
 Garden State Parkway between mile markers 102 and 126.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Protecting yourself from immediate threats to life and safety shall
take priority.  Whenever possible, as long as it does not cause
greater harm, all COVID-19 protective action guidance should be
followed.

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 4023 7397 4020 7440 4022 7489 4034 7501
      4050 7442 4049 7428 4046 7426 4044 7420
      4046 7418 4045 7413 4041 7399 4048 7402
      4048 7401 4043 7397
TIME...MOT...LOC 0513Z 257DEG 9KT 4033 7463 

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

Staarmann

2 follow-up statements

769 
WWUS51 KPHI 240534
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
134 AM EDT Fri Jul 24 2020

NJC019-PAC017-240544-
/O.CAN.KPHI.SV.W.0183.000000T0000Z-200724T0615Z/
Hunterdon NJ-Bucks PA-
134 AM EDT Fri Jul 24 2020

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHERN HUNTERDON AND EAST
CENTRAL BUCKS COUNTIES IS CANCELLED...

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

LAT...LON 4022 7431 4030 7432 4030 7479 4038 7486
      4050 7442 4049 7428 4046 7426 4044 7420
      4046 7418 4041 7400 4041 7399 4048 7402
      4048 7401 4043 7397 4023 7397
TIME...MOT...LOC 0534Z 253DEG 14KT 4037 7467 4040 7435 4034 7416 

$$

NJC021-023-025-035-240615-
/O.CON.KPHI.SV.W.0183.000000T0000Z-200724T0615Z/
Mercer NJ-Somerset NJ-Monmouth NJ-Middlesex NJ-
134 AM EDT Fri Jul 24 2020

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 215 AM EDT
FOR NORTHERN MERCER...SOUTHEASTERN SOMERSET...NORTHEASTERN MONMOUTH
AND MIDDLESEX COUNTIES...

At 134 AM EDT, severe thunderstorms were located along a line
extending from Princeton to Old Bridge to Holmdel, moving east at 15
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, Long Branch, Asbury Park, Sandy Hook, Somerset,
Middletown, Old Bridge, East Brunswick, South Brunswick, Sayreville,
North Brunswick, Marlboro, Tinton Falls, Holmdel, Princeton, Red
Bank, Matawan, Jamesburg, Highlands and Cranbury.

This includes the following highways...
 New Jersey Turnpike between exits 9 and 10.
 Garden State Parkway between mile markers 103 and 126.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Protecting yourself from immediate threats to life and safety shall
take priority.  Whenever possible, as long as it does not cause
greater harm, all COVID-19 protective action guidance should be
followed.

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

Frequent cloud to ground lightning is occurring with these storms.
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 these storms, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.

&&

LAT...LON 4022 7431 4030 7432 4030 7479 4038 7486
      4050 7442 4049 7428 4046 7426 4044 7420
      4046 7418 4041 7400 4041 7399 4048 7402
      4048 7401 4043 7397 4023 7397
TIME...MOT...LOC 0534Z 253DEG 14KT 4037 7467 4040 7435 4034 7416 

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

Staarmann

820 
WWUS51 KPHI 240549
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
149 AM EDT Fri Jul 24 2020

NJC021-240559-
/O.CAN.KPHI.SV.W.0183.000000T0000Z-200724T0615Z/
Mercer NJ-
149 AM EDT Fri Jul 24 2020

...THE SEVERE THUNDERSTORM WARNING FOR NORTHERN MERCER COUNTY IS
CANCELLED...

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

LAT...LON 4022 7410 4027 7414 4026 7429 4032 7430
      4035 7458 4039 7463 4041 7474 4050 7442
      4049 7428 4046 7426 4044 7420 4046 7418
      4041 7399 4048 7402 4048 7401 4043 7397
      4023 7397
TIME...MOT...LOC 0549Z 257DEG 9KT 4038 7463 4041 7431 4035 7412 

$$

NJC023-025-035-240615-
/O.CON.KPHI.SV.W.0183.000000T0000Z-200724T0615Z/
Somerset NJ-Monmouth NJ-Middlesex NJ-
149 AM EDT Fri Jul 24 2020

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 215 AM EDT
FOR SOUTHEASTERN SOMERSET...NORTHEASTERN MONMOUTH AND CENTRAL
MIDDLESEX COUNTIES...

At 149 AM EDT, severe thunderstorms were located along a line
extending from Kingston to Brownville to Lincroft, moving east at 10
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, Long Branch, Asbury Park, Sandy Hook, Middletown, Old
Bridge, East Brunswick, South Brunswick, Sayreville, North Brunswick,
Marlboro, Tinton Falls, Holmdel, Red Bank, Matawan, Jamesburg,
Highlands, Rocky Hill, Brownville and East Freehold.

This includes the following highways...
 New Jersey Turnpike between exits 9 and 10.
 Garden State Parkway between mile markers 102 and 126.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Protecting yourself from immediate threats to life and safety shall
take priority.  Whenever possible, as long as it does not cause
greater harm, all COVID-19 protective action guidance should be
followed.

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

Frequent cloud to ground lightning is occurring with these storms.
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 these storms, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.

&&

LAT...LON 4022 7410 4027 7414 4026 7429 4032 7430
      4035 7458 4039 7463 4041 7474 4050 7442
      4049 7428 4046 7426 4044 7420 4046 7418
      4041 7399 4048 7402 4048 7401 4043 7397
      4023 7397
TIME...MOT...LOC 0549Z 257DEG 9KT 4038 7463 4041 7431 4035 7412 

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

Staarmann

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 23, 8:04 PM EDT	Severe Thunderstorm Warning	PHI	Middlesex, Monmouth	26 min
Jul 23, 11:16 PM EDT	Severe Thunderstorm Warning	PHI	Gloucester, Salem	44 min
Jul 23, 11:27 PM EDT	Special Marine Warning	PHI		63 min
Jul 24, 12:14 AM EDT	Special Weather Statement	PHI	Middlesex	31 min
Jul 24, 12:23 AM EDT	Severe Thunderstorm Warning	PHI	Mercer, Middlesex, Monmouth, Somerset	52 min
Jul 24, 12:31 AM EDT	Areal Flood Advisory	PHI	Hunterdon, Mercer, Middlesex, Monmouth, Somerset	119 min
Jul 24, 12:51 AM EDT	Special Marine Warning	PHI		54 min
Jul 24, 1:28 AM EDT	Flash Flood Warning	PHI	Mercer, Middlesex, Monmouth, Somerset	4 hr
Jul 24, 1:36 AM EDT	Special Marine Warning	PHI		84 min
Jul 24, 2:18 AM EDT	Severe Thunderstorm Warning	PHI	Hunterdon, Middlesex, Morris, Somerset	42 min
Jul 24, 5:04 AM EDT	Special Marine Warning	PHI		56 min
Jul 24, 10:43 AM EDT	Flash Flood Warning	PHI	Camden	76 min
Jul 24, 11:42 AM EDT	Special Marine Warning	PHI		63 min
Jul 24, 12:43 PM EDT	Areal Flood Advisory	PHI	Ocean	3 hr
Jul 24, 1:09 PM EDT	Areal Flood Advisory	PHI	Monmouth, Ocean	110 min
Jul 24, 1:40 PM EDT	Special Weather Statement	PHI	Atlantic	35 min
Jul 24, 1:43 PM EDT	Areal Flood Advisory	PHI	Burlington, Mercer, Monmouth	3 hr
Jul 24, 2:02 PM EDT	Areal Flood Advisory	PHI	Atlantic, Burlington, Camden, Gloucester	3 hr
Jul 24, 2:19 PM EDT	Areal Flood Advisory	PHI	Burlington, Camden, Gloucester	2 hr
Jul 24, 2:26 PM EDT	Flash Flood Warning	PHI	Burlington	2 hr
Jul 24, 2:39 PM EDT	Areal Flood Advisory	PHI	Burlington, Ocean	3 hr
Jul 24, 2:42 PM EDT	Areal Flood Advisory	PHI	Burlington, Ocean	2 hr
Jul 24, 3:34 PM EDT	Flash Flood Warning	PHI	Atlantic, Burlington, Ocean	2 hr
Jul 24, 4:22 PM EDT	Areal Flood Advisory	PHI	Atlantic, Cape May	3 hr
Jul 24, 4:58 PM EDT	Areal Flood Advisory	PHI	Cape May	2 hr
Jul 23, 10:26 PM EDT	Severe Thunderstorm Warning	PHI	Chester	49 min
Jul 23, 10:44 PM EDT	Areal Flood Advisory	PHI	Chester	2 hr
Jul 23, 11:10 PM EDT	Areal Flood Advisory	PHI	Chester, Delaware	2 hr
Jul 23, 11:38 PM EDT	Special Weather Statement	PHI	Chester	37 min
Jul 23, 11:44 PM EDT	Severe Thunderstorm Warning	PHI	Chester, Delaware, Montgomery, Philadelphia	46 min
Jul 24, 12:24 AM EDT	Flash Flood Warning	PHI	Chester	114 min
Jul 24, 12:32 AM EDT	Special Weather Statement	PHI	Bucks, Montgomery	28 min
Jul 24, 12:42 AM EDT	Severe Thunderstorm Warning	PHI	Bucks, Montgomery	48 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.