Alert archive / New Jersey / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 144, NWS Philadelphia/Mount Holly

July 8, 20214 counties in New Jersey

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Jul 8, 2021, 2:29 PM EDT for 4 counties in New Jersey. It was in force for 46 min. 5 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 8, 2021, 2:29 PM EDT (18:29 UTC)
Expired: Jul 8, 2021, 3:15 PM EDT
In force: 46 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Hunterdon County, NJ, Morris County, NJ, Somerset County, NJ, Warren County, NJ

The radar

The Philadelphia radar (KDIX), 95 km from the middle of the area, began a volume at 18:29 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 8, 2:43 PM EDT	HAIL 0.5	1 S Glen Gardner, NJ	REPORT FROM MPING: HALF-INCH (0.50 IN.).
Jul 8, 2:55 PM EDT	TSTM WND DMG	Readington, NJ	REPORT AND VIDEO OF STRONG MICROBURST WINDS IN READINGTON. SEVERAL TREES WERE UPROOTED IN THE AREA WHICH ALSO BROUGHT DOWN POWER LINES. TIME ESTIMATED FROM RADAR AND ANOTHER NEARBY REPORT OF THE SAME MICROBURST.
Jul 8, 2:57 PM EDT	TSTM WND DMG	Whitehouse Station, NJ	VIDEO SHOWS VERY STRONG MICROBURST WINDS WITH LAWN AND PATIO FURNITURE BEING BLOWN OVER AND LIMBS BEING BLOWN OUT OF TREES. SEVERAL TREES WERE UPROOTED NEARBY AS A RESULT.
Jul 8, 3:13 PM EDT	TSTM WND DMG	Bedminster Twp, NJ	SEVERAL TREES DOWNED IN THE AREA OF BEDMINSTER AND FAR HILLS. TIME ESTIMATED FROM RADAR.
Jul 8, 3:15 PM EDT	TSTM WND DMG	Peapack, NJ	TREES WERE DOWNED IN PEAPACK. 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 8, 2:09 PM EDT	Severe Thunderstorm Watch	SPC	7 hr

The nearest sounding before it

Brookhaven, NY (KOKX), launched 12:00Z, 6.5 hours before the alert went out and 173 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: 973 J/kg
Mixed-layer CIN: -77 J/kg
Mixed-layer LCL: 751 m above ground
0-6 km bulk shear: 28 kt
0-1 km storm-relative helicity: 60 m²/s²
0-3 km storm-relative helicity: 93 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.3

Open this sounding in Storm Lab

The text

As transmitted.

043 
WUUS51 KPHI 081829
SVRPHI
NJC019-027-035-041-081915-
/O.NEW.KPHI.SV.W.0144.210708T1829Z-210708T1915Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mount Holly NJ
229 PM EDT Thu Jul 8 2021

The National Weather Service in Mount Holly NJ has issued a

* Severe Thunderstorm Warning for...
  Hunterdon County in northwestern New Jersey...
  Southwestern Morris County in northern New Jersey...
  Central Warren County in northwestern New Jersey...
  Northwestern Somerset County in northern New Jersey...

* Until 315 PM EDT.

* At 229 PM EDT, a severe thunderstorm was located near Bloomsbury,
  or 11 miles east of Easton, moving northeast at 25 mph.

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

  SOURCE...Radar indicated.

  IMPACT...Minor damage to vehicles is possible. Wind damage to 
           roofs, siding, trees, and power lines is possible.

* Locations impacted include...
  Hackettstown, Washington, Mendham, Flemington, High Bridge,
  Netcong, Clinton, Peapack And Gladstone, Oxford, Alpha, Glen
  Gardner, Chester, Hampton, Frenchtown, Lebanon, Milford, Califon,
  Far Hills, Bloomsbury and Brass Castle.

This includes the following highways...
 Interstate 78 in New Jersey between mile markers 2 and 31.
 Interstate 80 in New Jersey between mile markers 13 and 23.
 Interstate 287 in New Jersey between mile markers 21 and 24.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4094 7479 4092 7477 4092 7476 4078 7451
      4054 7474 4046 7501 4051 7507 4054 7507
      4057 7511 4057 7515 4061 7520 4099 7489
TIME...MOT...LOC 1829Z 211DEG 24KT 4064 7502 

HAIL...1.00IN
WIND...60MPH
 
$$

NC

1 follow-up statement

292 
WWUS51 KPHI 081908
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
308 PM EDT Thu Jul 8 2021

NJC019-027-035-041-081917-
/O.EXP.KPHI.SV.W.0144.000000T0000Z-210708T1915Z/
Hunterdon NJ-Morris NJ-Warren NJ-Somerset NJ-
308 PM EDT Thu Jul 8 2021

...THE SEVERE THUNDERSTORM WARNING FOR HUNTERDON...SOUTHWESTERN
MORRIS...CENTRAL WARREN AND NORTHWESTERN SOMERSET COUNTIES WILL
EXPIRE AT 315 PM EDT...
        
The storm which prompted the warning has moved out of the area.
Therefore, the warning will be allowed to expire.

A Severe Thunderstorm Watch remains in effect until 900 PM EDT for
northern and northwestern New Jersey...and eastern and southeastern
Pennsylvania.

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 4094 7479 4092 7477 4092 7476 4078 7451
      4054 7474 4046 7501 4051 7507 4054 7507
      4057 7511 4057 7515 4061 7520 4099 7489
TIME...MOT...LOC 1907Z 211DEG 24KT 4062 7474 

$$

NC

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 7, 11:06 PM EDT	Tropical Storm Warning	PHI	Atlantic, Burlington, Cape May, Monmouth, Ocean	32 hr
Jul 7, 11:37 PM EDT	Special Weather Statement	PHI	Sussex	38 min
Jul 8, 5:27 AM EDT	Small Craft Advisory	PHI		34 hr
Jul 8, 1:49 PM EDT	Severe Thunderstorm Warning	PHI	Hunterdon, Morris, Somerset	41 min
Jul 8, 2:09 PM EDT	Special Marine Warning	PHI		81 min
Jul 8, 2:26 PM EDT	Severe Thunderstorm Warning	PHI	Monmouth, Ocean	21 min
Jul 8, 2:43 PM EDT	Rip Current Statement	PHI	Atlantic, Cape May, Monmouth, Ocean	27 hr
Jul 8, 3:03 PM EDT	Severe Thunderstorm Warning	PHI	Hunterdon, Middlesex, Morris, Somerset	42 min
Jul 8, 4:02 PM EDT	Special Marine Warning	PHI		33 min
Jul 8, 4:02 PM EDT	Severe Thunderstorm Warning	PHI	Monmouth	31 min
Jul 8, 4:43 PM EDT	Severe Thunderstorm Warning	PHI	Middlesex, Somerset	16 min
Jul 8, 5:29 PM EDT	Special Weather Statement	PHI	Morris, Warren	46 min
Jul 8, 5:34 PM EDT	Severe Thunderstorm Warning	PHI	Hunterdon, Morris, Sussex, Warren	41 min
Jul 8, 6:06 PM EDT	Severe Thunderstorm Warning	PHI	Hunterdon	39 min
Jul 8, 6:09 PM EDT	Severe Thunderstorm Warning	PHI	Hunterdon, Morris, Somerset, Sussex	51 min
Jul 8, 6:16 PM EDT	Severe Thunderstorm Warning	PHI	Hunterdon, Morris, Sussex, Warren	44 min

Nearby

Severe Thunderstorm Warnings in New Jersey, 2021 Every severe thunderstorm warning 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.