Alert archive / New Jersey / Tornado Warnings in 2021

Tornado Warning 23, NWS Philadelphia/Mount Holly

July 29, 20215 counties in New Jersey; Bucks County, Pennsylvania

NWS Philadelphia/Mount Holly issued this tornado warning at Jul 29, 2021, 6:06 PM EDT for 5 counties in New Jersey; Bucks County, Pennsylvania. It was in force for 39 min. 9 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 29, 2021, 6:06 PM EDT (22:06 UTC)
Expired: Jul 29, 2021, 6:45 PM EDT
In force: 39 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon
Tornado: Radar indicated
Damage threat: Considerable
Hail: 1.0 in

Counties Burlington County, NJ, Hunterdon County, NJ, Mercer County, NJ, Middlesex County, NJ, Monmouth County, NJ, Bucks County, PA

The radar

The Philadelphia radar (KDIX), 40 km from the middle of the area, began a volume at 22:08 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 29, 6:10 PM EDT	TSTM WND DMG	1 Nw Washington Crossin, NJ	MULTIPLE TREES DOWN IN TITUSVILLE, NJ. POSSIBLE TORNADO. TIME ESTIMATED FROM RADAR.
Jul 29, 6:10 PM EDT	TSTM WND DMG	Washington Crossing, PA	DEBRIS BLOCKING PA ROUTE 32.
Jul 29, 6:10 PM EDT	TSTM WND DMG	Washington Crossing, NJ	TREES DOWN ON NJ ROUTE 29 WITH THE HIGHWAY CLOSED.
Jul 29, 6:10 PM EDT	HAIL 0.75	3 Nw Pennington, NJ	PUBLIC REPORTS MARBLE SIZE HAIL. TIME ESTIMATED FROM RADAR.
Jul 29, 6:11 PM EDT	TSTM WND DMG	3 Nnw Washington Crossi, NJ	TREES AND WIRES DOWN ON PLEASANT VALLEY ROAD IN HOPEWELL.
Jul 29, 6:19 PM EDT	TSTM WND DMG	1 S Pennington, NJ	MULTIPLE TREES SNAPPED AND UPROOTED NEAR PENNINGTON, NJ. POSSIBLE TORNADO. TIME ESTIMATED FROM RADAR.
Jul 29, 6:21 PM EDT	TSTM WND GST 46	Trenton Mercer Airport, NJ
Jul 29, 6:25 PM EDT	TSTM WND DMG	Lawrence Twp, NJ	WIRES DOWN ALONG WEST CHURCH ROAD.
Jul 29, 6:48 PM EDT	TSTM WND DMG	1 Se Robbinsville Twp., NJ	LOTS OF TREE BRANCHES DOWN AND POWER IS OUT IN ROBBINSVILLE NORTH OF 130. 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 29, 2:23 PM EDT	Tornado Watch	SPC	8 hr

The nearest sounding before it

Brookhaven, NY (KOKX), launched 12:00Z, 10.1 hours before the alert went out and 166 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: 54 J/kg
Mixed-layer CIN: -32 J/kg
Mixed-layer LCL: 823 m above ground
0-6 km bulk shear: 29 kt
0-1 km storm-relative helicity: 65 m²/s²
0-3 km storm-relative helicity: 127 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.1

Open this sounding in Storm Lab

The text

As transmitted.

814 
WFUS51 KPHI 292206
TORPHI
NJC005-019-021-023-025-PAC017-292245-
/O.NEW.KPHI.TO.W.0023.210729T2206Z-210729T2245Z/

BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service Mount Holly NJ
606 PM EDT Thu Jul 29 2021

The National Weather Service in Mount Holly NJ has issued a

* Tornado Warning for...
  Southern Hunterdon County in northwestern New Jersey...
  Mercer County in central New Jersey...
  Northern Burlington County in southern New Jersey...
  Western Monmouth County in central New Jersey...
  Southwestern Middlesex County in northern New Jersey...
  East central Bucks County in southeastern Pennsylvania...

* Until 645 PM EDT.
    
* At 606 PM EDT, a large and extremely dangerous tornado was located
  over Washington Crossing, or 9 miles northwest of Trenton, moving
  southeast at 25 mph.

  This is a PARTICULARLY DANGEROUS SITUATION. TAKE COVER NOW!

  HAZARD...Damaging tornado.

  SOURCE...Radar indicated rotation.

  IMPACT...You are in a life-threatening situation. Flying debris 
           may be deadly to those caught without shelter. Mobile 
           homes will be destroyed. Considerable damage to homes, 
           businesses, and vehicles is likely and complete 
           destruction is possible.

* Locations impacted include...
  Trenton, Ewing, Princeton, Hightstown, Bordentown, Cranbury,
  Pennington, New Hope, Yardley, Hopewell, Allentown, Washington
  Crossing, Princeton Meadows, Windsor, Plainsboro Center, Woodside,
  Edinburg, Crosswicks, White Horse and Twin Rivers.

This includes the following highways...
 New Jersey Turnpike between exits 8 and 8A.
 Interstate 195 in New Jersey between mile markers 0 and 10.
 Interstate 295 in New Jersey between mile markers 57 and 76.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

To repeat, a large, extremely dangerous and potentially deadly
tornado is developing. To protect your life, TAKE COVER NOW! Move to
a basement or an interior room on the lowest floor of a sturdy
building. Avoid windows. If you are outdoors, in a mobile home, or in
a vehicle, move to the closest substantial shelter and protect
yourself from flying debris.

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

&&

LAT...LON 4007 7459 4029 7502 4043 7491 4033 7455
      4030 7448 4027 7448
TIME...MOT...LOC 2206Z 298DEG 23KT 4032 7490 

TORNADO...RADAR INDICATED
TORNADO DAMAGE THREAT...CONSIDERABLE
HAIL...1.00IN

$$

Fitzsimmons

2 follow-up statements

067 
WWUS51 KPHI 292218
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
618 PM EDT Thu Jul 29 2021

NJC019-023-292228-
/O.CAN.KPHI.TO.W.0023.000000T0000Z-210729T2245Z/
Hunterdon NJ-Middlesex NJ-
618 PM EDT Thu Jul 29 2021

...THE TORNADO WARNING FOR SOUTHERN HUNTERDON AND SOUTHWESTERN
MIDDLESEX COUNTIES IS CANCELLED...
    
The tornadic thunderstorm which prompted the warning has moved out 
of the warned area. Therefore, the warning has been cancelled.

A Tornado Watch remains in effect until 900 PM EDT for southern,
central and northern New Jersey...and southeastern Pennsylvania.

LAT...LON 4007 7459 4009 7464 4025 7493 4037 7483
      4031 7457 4029 7456 4029 7453 4027 7448
      4026 7448
TIME...MOT...LOC 2218Z 298DEG 23KT 4028 7481 

$$

NJC005-021-025-PAC017-292245-
/O.CON.KPHI.TO.W.0023.000000T0000Z-210729T2245Z/
Mercer NJ-Burlington NJ-Monmouth NJ-Bucks PA-
618 PM EDT Thu Jul 29 2021

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 645 PM EDT FOR MERCER...
NORTHERN BURLINGTON...WESTERN MONMOUTH AND EAST CENTRAL BUCKS
COUNTIES...
    
At 618 PM EDT, a large and extremely dangerous tornado was located
over Ewing, or near Trenton, moving southeast at 25 mph.

This is a PARTICULARLY DANGEROUS SITUATION. TAKE COVER NOW!

HAZARD...Damaging tornado.

SOURCE...Radar indicated rotation.

IMPACT...You are in a life-threatening situation. Flying debris may 
         be deadly to those caught without shelter. Mobile homes 
         will be destroyed. Considerable damage to homes, 
         businesses, and vehicles is likely and complete destruction 
         is possible.

Locations impacted include...
Trenton, Ewing, Hightstown, Bordentown, Pennington, Yardley,
Allentown, Washington Crossing, Edinburg, Crosswicks, White Horse,
Windsor, Twin Rivers, Mercerville-Hamilton Square, Lawrenceville,
Woodside, Morrisville, Fieldsboro, Princeton Junction and
Yardville-Groveville.

This includes the following highways...
 New Jersey Turnpike between exits 7A and 8A.
 Interstate 195 in New Jersey between mile markers 0 and 10.
 Interstate 295 in New Jersey between mile markers 57 and 76.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

To repeat, a large, extremely dangerous and potentially deadly
tornado is developing. To protect your life, TAKE COVER NOW! Move to
a basement or an interior room on the lowest floor of a sturdy
building. Avoid windows. If you are outdoors, in a mobile home, or in
a vehicle, move to the closest substantial shelter and protect
yourself from flying debris.

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

&&

LAT...LON 4007 7459 4009 7464 4025 7493 4037 7483
      4031 7457 4029 7456 4029 7453 4027 7448
      4026 7448
TIME...MOT...LOC 2218Z 298DEG 23KT 4028 7481 

TORNADO...RADAR INDICATED
TORNADO DAMAGE THREAT...CONSIDERABLE
HAIL...1.00IN

$$

Fitzsimmons

238 
WWUS51 KPHI 292234
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
634 PM EDT Thu Jul 29 2021

PAC017-292244-
/O.CAN.KPHI.TO.W.0023.000000T0000Z-210729T2245Z/
Bucks PA-
634 PM EDT Thu Jul 29 2021

...THE TORNADO WARNING FOR EAST CENTRAL BUCKS COUNTY IS CANCELLED...
    
The tornadic thunderstorm which prompted the warning has moved out 
of the warned area. Therefore, the warning has been cancelled.

A Tornado Watch remains in effect until 900 PM EDT for southern,
central and northern New Jersey...and southeastern Pennsylvania.

LAT...LON 4023 7450 4008 7458 4015 7471 4020 7476
      4022 7477 4023 7480 4033 7474 4028 7449
      4027 7448 4025 7448
TIME...MOT...LOC 2234Z 294DEG 23KT 4024 7468 

$$

NJC005-021-025-292245-
/O.CON.KPHI.TO.W.0023.000000T0000Z-210729T2245Z/
Mercer NJ-Burlington NJ-Monmouth NJ-
634 PM EDT Thu Jul 29 2021

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 645 PM EDT FOR
SOUTHEASTERN MERCER...NORTHERN BURLINGTON AND WESTERN MONMOUTH
COUNTIES...
        
At 634 PM EDT, a confirmed large and extremely dangerous tornado was
located over Mercerville-Hamilton Square, or near Trenton, moving
southeast at 25 mph.

This is a PARTICULARLY DANGEROUS SITUATION. TAKE COVER NOW!

HAZARD...Damaging tornado.

SOURCE...Radar confirmed tornado.

IMPACT...You are in a life-threatening situation. Flying debris may 
         be deadly to those caught without shelter. Mobile homes 
         will be destroyed. Considerable damage to homes, 
         businesses, and vehicles is likely and complete destruction 
         is possible.

Locations impacted include...
Trenton, Ewing, Hightstown, Bordentown, Allentown, Edinburg,
Crosswicks, White Horse, Windsor, Twin Rivers, Mercerville-Hamilton
Square, Lawrenceville, Yardville-Groveville and Princeton Junction.

This includes the following highways...
 New Jersey Turnpike between exits 8 and 8A.
 Interstate 195 in New Jersey between mile markers 0 and 10.
 Interstate 295 in New Jersey between mile markers 59 and 71.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

To repeat, a large, extremely dangerous and potentially deadly
tornado is occurring. To protect your life, TAKE COVER NOW! Move to a
basement or an interior room on the lowest floor of a sturdy
building. Avoid windows. If you are outdoors, in a mobile home, or in
a vehicle, move to the closest substantial shelter and protect
yourself from flying debris.

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

&&

LAT...LON 4023 7450 4008 7458 4015 7471 4020 7476
      4022 7477 4023 7480 4033 7474 4028 7449
      4027 7448 4025 7448
TIME...MOT...LOC 2234Z 294DEG 23KT 4024 7468 

TORNADO...OBSERVED
TORNADO DAMAGE THREAT...CONSIDERABLE
HAIL...1.00IN

$$

Fitzsimmons

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 29, 3:33 AM EDT	Small Craft Advisory	PHI		20 hr
Jul 29, 1:33 PM EDT	Special Marine Warning	PHI		42 min
Jul 29, 2:53 PM EDT	Special Marine Warning	PHI		100 min
Jul 29, 4:26 PM EDT	Special Weather Statement	PHI	Morris	34 min
Jul 29, 4:30 PM EDT	Severe Thunderstorm Warning	PHI	Hunterdon, Warren	45 min
Jul 29, 4:57 PM EDT	Areal Flood Advisory	PHI	Hunterdon, Morris, Sussex, Warren	3 hr
Jul 29, 5:01 PM EDT	Special Weather Statement	PHI	Morris	29 min
Jul 29, 5:03 PM EDT	Severe Thunderstorm Warning	PHI	Hunterdon, Morris, Somerset, Sussex, Warren	42 min
Jul 29, 5:08 PM EDT	Tornado Warning	PHI	Hunterdon	37 min
Jul 29, 5:27 PM EDT	Areal Flood Advisory	PHI	Hunterdon, Mercer, Morris, Somerset	3 hr
Jul 29, 5:32 PM EDT	Flash Flood Warning	PHI	Warren	2 hr
Jul 29, 5:32 PM EDT	Tornado Warning	PHI	Hunterdon	28 min
Jul 29, 5:51 PM EDT	Tornado Warning Tornado observedConsiderable damage threat	PHI	Hunterdon, Mercer	24 min
Jul 29, 5:58 PM EDT	Flash Flood Warning	PHI	Hunterdon, Mercer, Somerset	3 hr
Jul 29, 6:44 PM EDT	Tornado Warning	PHI	Mercer, Monmouth, Ocean	46 min
Jul 29, 6:45 PM EDT	Severe Thunderstorm Warning	PHI	Burlington, Mercer	45 min
Jul 29, 6:56 PM EDT	Flash Flood Warning	PHI	Mercer, Middlesex, Monmouth, Ocean, Somerset	4 hr
Jul 29, 7:07 PM EDT	Tornado Warning	PHI	Burlington	23 min
Jul 29, 7:12 PM EDT	Flash Flood Warning	PHI	Burlington	4 hr
Jul 29, 7:18 PM EDT	Tornado Warning	PHI	Mercer, Middlesex, Monmouth, Ocean	27 min
Jul 29, 7:25 PM EDT	Severe Thunderstorm Warning	PHI	Burlington, Monmouth, Ocean	50 min
Jul 29, 7:28 PM EDT	Severe Thunderstorm Warning	PHI	Burlington, Mercer, Middlesex, Monmouth, Ocean	47 min
Jul 29, 7:52 PM EDT	Special Marine Warning	PHI		113 min
Jul 29, 3:48 PM EDT	Severe Thunderstorm Warning	PHI	Berks, Lehigh, Northampton	42 min
Jul 29, 4:03 PM EDT	Tornado Warning	PHI	Berks, Lehigh, Northampton	27 min
Jul 29, 4:27 PM EDT	Tornado Warning	PHI	Lehigh, Northampton	16 min
Jul 29, 4:46 PM EDT	Areal Flood Advisory	PHI	Berks, Lehigh, Northampton	3 hr
Jul 29, 4:56 PM EDT	Tornado Warning	PHI	Bucks, Lehigh, Northampton	34 min
Jul 29, 6:21 PM EDT	Special Weather Statement	PHI	Bucks	24 min

Nearby

Tornado Warnings in New Jersey, 2021 Tornado Warnings in Pennsylvania, 2021 Every tornado warning in 2021 Tornadoes in 2021

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.