Alert archive / New Jersey / Tornado Warnings in 2021

Tornado Warning 22, NWS Philadelphia/Mount Holly

July 29, 2021Hunterdon County, Mercer County, New Jersey; Bucks County, Pennsylvania

NWS Philadelphia/Mount Holly issued this tornado warning at Jul 29, 2021, 5:51 PM EDT for Hunterdon County, Mercer County, New Jersey; Bucks County, Pennsylvania. It was in force for 24 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, 5:51 PM EDT (21:51 UTC)
Expired
Jul 29, 2021, 6:15 PM EDT
In force
24 min
Issued by
NWS Philadelphia/Mount Holly
Area
Storm-based polygon
Tornado
Observed
Damage threat
Considerable
Hail
1.0 in

Counties Hunterdon County, NJ, Mercer County, NJ, Bucks County, PA

The radar

The Philadelphia radar (KDIX), 63 km from the middle of the area, began a volume at 21:56 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

TimeReportWhereRemark
Jul 29, 5:57 PM EDTTSTM WND DMGNew Hope, PANUMEROUS REPORTS OF TREES AND LINES DOWN IN NEW HOPE. POSSIBLE TORNADO. TIME ESTIMATED FROM RADAR.
Jul 29, 5:59 PM EDTTORNADO1 S New Hope, PATHE SUPERCELL STORM WHICH PRODUCED A TORNADO IN PLUMSTEAD TWP CYCLED AND PRODUCED ANOTHER TORNADO BEGINNING IN NEW HOPE IN BUCKS COUNTY, PENNSYLVANIA. TREE DAMAGE BEGAN NEAR RIVER RD JUST WEST OF THE DELAWARE RIVER, WITH A PORTION OF RIVER RD CLOSED AND IMPASS
Jul 29, 6:10 PM EDTTSTM WND DMG1 Nw Washington Crossin, NJMULTIPLE TREES DOWN IN TITUSVILLE, NJ. POSSIBLE TORNADO. TIME ESTIMATED FROM RADAR.
Jul 29, 6:10 PM EDTTSTM WND DMGWashington Crossing, PADEBRIS BLOCKING PA ROUTE 32.
Jul 29, 6:10 PM EDTTSTM WND DMGWashington Crossing, NJTREES DOWN ON NJ ROUTE 29 WITH THE HIGHWAY CLOSED.
Jul 29, 6:10 PM EDTHAIL 0.753 Nw Pennington, NJPUBLIC REPORTS MARBLE SIZE HAIL. TIME ESTIMATED FROM RADAR.
Jul 29, 6:11 PM EDTTSTM WND DMG3 Nnw Washington Crossi, NJTREES AND WIRES DOWN ON PLEASANT VALLEY ROAD IN HOPEWELL.
Jul 29, 6:19 PM EDTTSTM WND DMG1 S Pennington, NJMULTIPLE TREES SNAPPED AND UPROOTED NEAR PENNINGTON, NJ. POSSIBLE TORNADO. TIME ESTIMATED FROM RADAR.
Jul 29, 6:21 PM EDTTSTM WND GST 46Trenton Mercer Airport, NJ

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.

IssuedProductOfficeLasted
Jul 29, 2:23 PM EDTTornado WatchSPC8 hr

The nearest sounding before it

Brookhaven, NY (KOKX), launched 12:00Z, 9.9 hours before the alert went out and 189 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-pSkew-T log-p diagram, Brookhaven, NY at 12:00Z on 2021-07-29Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 54 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Brookhaven, NY at 12:00Z on 2021-07-29The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 65 square meters per square second.19395878Sfc1 km3 km6 km9 kmRMLM
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.

687 
WFUS51 KPHI 292151
TORPHI
NJC019-021-PAC017-292215-
/O.NEW.KPHI.TO.W.0022.210729T2151Z-210729T2215Z/

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

The National Weather Service in Mount Holly NJ has issued a

* Tornado Warning for...
  South central Hunterdon County in northwestern New Jersey...
  Northwestern Mercer County in central New Jersey...
  East central Bucks County in southeastern Pennsylvania...

* Until 615 PM EDT.
    
* At 550 PM EDT, a confirmed dangerous tornado was located near 
  Lumberville, or 16 miles northwest of 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, Doylestown, Byram, Pennington, New Hope, Yardley,
  Newtown, Stockton, Washington Crossing, Gardenville, Lawrenceville,
  Lumberville, Woodside, Richboro, Levittown, Lambertville,
  Woodbourne, Newtown Grant and Fairless Hills.

This includes Interstate 295 in New Jersey between mile markers 70
and 76.
 
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 4031 7515 4044 7507 4034 7471 4016 7482
TIME...MOT...LOC 2150Z 298DEG 23KT 4036 7503 

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

$$

Fitzsimmons
1 follow-up statement
066 
WWUS51 KPHI 292202
SVSPHI

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

NJC019-021-PAC017-292215-
/O.CON.KPHI.TO.W.0022.000000T0000Z-210729T2215Z/
Hunterdon NJ-Mercer NJ-Bucks PA-
602 PM EDT Thu Jul 29 2021

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 615 PM EDT FOR SOUTHERN
HUNTERDON...NORTHWESTERN MERCER AND EAST CENTRAL BUCKS COUNTIES...
        
At 601 PM EDT, a confirmed large and dangerous tornado was located 
over New Hope, or 11 miles northwest of 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, Pennington, New Hope, Yardley, Washington Crossing,
Lawrenceville, Woodside, Levittown, Lambertville, Newtown Grant,
Woodbourne and Fairless Hills.

This includes Interstate 295 in New Jersey between mile markers 70
and 76.
 
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 4031 7505 4039 7499 4036 7480 4034 7471
      4017 7481
TIME...MOT...LOC 2201Z 298DEG 23KT 4032 7494 

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.

IssuedProductOfficeCountiesLasted
Jul 29, 3:33 AM EDTSmall Craft AdvisoryPHI20 hr
Jul 29, 1:33 PM EDTSpecial Marine WarningPHI42 min
Jul 29, 2:53 PM EDTSpecial Marine WarningPHI100 min
Jul 29, 4:26 PM EDTSpecial Weather StatementPHIMorris34 min
Jul 29, 4:30 PM EDTSevere Thunderstorm WarningPHIHunterdon, Warren45 min
Jul 29, 4:57 PM EDTAreal Flood AdvisoryPHIHunterdon, Morris, Sussex, Warren3 hr
Jul 29, 5:01 PM EDTSpecial Weather StatementPHIMorris29 min
Jul 29, 5:03 PM EDTSevere Thunderstorm WarningPHIHunterdon, Morris, Somerset, Sussex, Warren42 min
Jul 29, 5:08 PM EDTTornado WarningPHIHunterdon37 min
Jul 29, 5:27 PM EDTAreal Flood AdvisoryPHIHunterdon, Mercer, Morris, Somerset3 hr
Jul 29, 5:32 PM EDTFlash Flood WarningPHIWarren2 hr
Jul 29, 5:32 PM EDTTornado WarningPHIHunterdon28 min
Jul 29, 5:58 PM EDTFlash Flood WarningPHIHunterdon, Mercer, Somerset3 hr
Jul 29, 6:06 PM EDTTornado Warning Considerable damage threatPHIBurlington, Hunterdon, Mercer, Middlesex, Monmouth39 min
Jul 29, 6:44 PM EDTTornado WarningPHIMercer, Monmouth, Ocean46 min
Jul 29, 6:45 PM EDTSevere Thunderstorm WarningPHIBurlington, Mercer45 min
Jul 29, 6:56 PM EDTFlash Flood WarningPHIMercer, Middlesex, Monmouth, Ocean, Somerset4 hr
Jul 29, 7:07 PM EDTTornado WarningPHIBurlington23 min
Jul 29, 7:12 PM EDTFlash Flood WarningPHIBurlington4 hr
Jul 29, 7:18 PM EDTTornado WarningPHIMercer, Middlesex, Monmouth, Ocean27 min
Jul 29, 7:25 PM EDTSevere Thunderstorm WarningPHIBurlington, Monmouth, Ocean50 min
Jul 29, 7:28 PM EDTSevere Thunderstorm WarningPHIBurlington, Mercer, Middlesex, Monmouth, Ocean47 min
Jul 29, 7:52 PM EDTSpecial Marine WarningPHI113 min
Jul 29, 3:48 PM EDTSevere Thunderstorm WarningPHIBerks, Lehigh, Northampton42 min
Jul 29, 4:03 PM EDTTornado WarningPHIBerks, Lehigh, Northampton27 min
Jul 29, 4:27 PM EDTTornado WarningPHILehigh, Northampton16 min
Jul 29, 4:46 PM EDTAreal Flood AdvisoryPHIBerks, Lehigh, Northampton3 hr
Jul 29, 4:56 PM EDTTornado WarningPHIBucks, Lehigh, Northampton34 min
Jul 29, 6:21 PM EDTSpecial Weather StatementPHIBucks24 min

Nearby

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