Alert archive / New Jersey / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 33, NWS Philadelphia/Mount Holly

May 26, 2021Hunterdon County, Morris County, Warren County, New Jersey; Northampton County, Pennsylvania

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at May 26, 2021, 5:34 PM EDT for Hunterdon County, Morris County, Warren County, New Jersey; Northampton County, Pennsylvania. It was in force for 41 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 26, 2021, 5:34 PM EDT (21:34 UTC)
Expired: May 26, 2021, 6:15 PM EDT
In force: 41 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

Counties Hunterdon County, NJ, Morris County, NJ, Warren County, NJ, Northampton County, PA

The radar

The Philadelphia radar (KDIX), 94 km from the middle of the area, began a volume at 21:35 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 26, 5:35 PM EDT	TSTM WND DMG	2 S Montana, NJ	DOWNED TREES AND WIRES NEAR MONTANA ROAD. TIME ESTIMATED FROM RADAR.
May 26, 5:35 PM EDT	TSTM WND GST 44	1 Ene Pohatcong Twp, NJ	NJWXNET MEASURED GUST.
May 26, 5:39 PM EDT	TSTM WND DMG	1 Nw Bethlehem Twp, NJ	DOWNED TREES AND WIRES NEAR ASBURY WEST PORTAL ROAD. TIME ESTIMATED FROM RADAR.
May 26, 5:52 PM EDT	TSTM WND DMG	Lebanon Twp, NJ	DOWNED WIRES NEAR BUNNVALE ROAD AND HILL DRIVE EAST. TIME ESTIMATED FROM RADAR.
May 26, 5:54 PM EDT	TSTM WND DMG	2 W Mcpherson, NJ	DOWNED TREES AND WIRES NEAR ALLERTON AND CLINTON. TIME ESTIMATED FROM RADAR.
May 26, 5:56 PM EDT	TSTM WND DMG	Schooleys Mountain, NJ	DOWNED TREES AND WIRES NEAR SCHOOLEYS MOUNTAIN ROAD. TIME ESTIMATED FROM RADAR.
May 26, 6:06 PM EDT	HAIL 0.5	Lebanon, 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.

Issued	Product	Office	Lasted
May 26, 2:48 PM EDT	Severe Thunderstorm Watch	SPC	7 hr

The nearest sounding before it

Brookhaven, NY (KOKX), launched 12:00Z, 9.6 hours before the alert went out and 170 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: 5 J/kg
Mixed-layer CIN: -233 J/kg
Mixed-layer LCL: 554 m above ground
0-6 km bulk shear: 27 kt
0-1 km storm-relative helicity: 164 m²/s²
0-3 km storm-relative helicity: 159 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

834 
WUUS51 KPHI 262134
SVRPHI
NJC019-027-041-PAC095-262215-
/O.NEW.KPHI.SV.W.0033.210526T2134Z-210526T2215Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mount Holly NJ
534 PM EDT Wed May 26 2021

The National Weather Service in Mount Holly NJ has issued a

* Severe Thunderstorm Warning for...
  Northern Hunterdon County in northwestern New Jersey...
  Southwestern Morris County in northern New Jersey...
  Central Warren County in northwestern New Jersey...
  Southeastern Northampton County in eastern Pennsylvania...

* Until 615 PM EDT.

* At 534 PM EDT, severe thunderstorms were located along a line
  extending from near Belvidere to near Milford, 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...
  Hackettstown, Washington, Mount Arlington, High Bridge, Stanhope,
  Netcong, Clinton, Belvidere, Harmony, Oxford, Alpha, Glen Gardner,
  Chester, Hampton, Lebanon, Milford, Califon, Bloomsbury,
  Riegelsville and Brass Castle.

This includes the following highways...
 Interstate 78 in New Jersey between mile markers 1 and 26.
 Interstate 80 in New Jersey between mile markers 25 and 31.

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.

&&

LAT...LON 4091 7461 4073 7468 4072 7472 4064 7473
      4063 7472 4055 7475 4056 7509 4058 7512
      4057 7516 4057 7519 4060 7520 4091 7509
      4091 7472 4090 7471
TIME...MOT...LOC 2134Z 270DEG 26KT 4085 7503 4061 7511 

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

Meola

1 follow-up statement

794 
WWUS51 KPHI 262203
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
603 PM EDT Wed May 26 2021

PAC095-262211-
/O.CAN.KPHI.SV.W.0033.000000T0000Z-210526T2215Z/
Northampton PA-
603 PM EDT Wed May 26 2021

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

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

A Severe Thunderstorm Watch remains in effect until 1000 PM EDT for
northern and northwestern New Jersey.

LAT...LON 4091 7461 4073 7468 4072 7472 4064 7473
      4063 7472 4055 7475 4056 7495 4091 7485
      4091 7472 4090 7471
TIME...MOT...LOC 2201Z 270DEG 26KT 4085 7479 4061 7487 

$$

NJC019-027-041-262215-
/O.CON.KPHI.SV.W.0033.000000T0000Z-210526T2215Z/
Hunterdon NJ-Morris NJ-Warren NJ-
603 PM EDT Wed May 26 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 615 PM EDT
FOR NORTHEASTERN HUNTERDON...SOUTHWESTERN MORRIS AND EAST CENTRAL
WARREN COUNTIES...

At 601 PM EDT, severe thunderstorms were located along a line
extending from near Hackettstown to near Annandale, 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...
Hackettstown, Mount Arlington, High Bridge, Stanhope, Netcong,
Clinton, Chester, Lebanon, Califon, Succasunna, Succasunna-Kenvil,
Long Valley, Budd Lake, Annandale, White House Station, Beatyestown,
Allamuchy-Panther Valley and Beattyestown.

This includes the following highways...
 Interstate 78 in New Jersey between mile markers 16 and 26.
 Interstate 80 in New Jersey between mile markers 25 and 31.

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.

&&

LAT...LON 4091 7461 4073 7468 4072 7472 4064 7473
      4063 7472 4055 7475 4056 7495 4091 7485
      4091 7472 4090 7471
TIME...MOT...LOC 2201Z 270DEG 26KT 4085 7479 4061 7487 

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

Meola

The office that day

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

Issued	Product	Office	Counties	Lasted
May 26, 5:27 PM EDT	Severe Thunderstorm Warning	PHI	Hunterdon, Mercer	48 min
May 26, 5:53 PM EDT	Severe Thunderstorm Warning	PHI	Burlington, Camden, Hunterdon, Mercer, Middlesex, Monmouth and 2 more	67 min
May 26, 6:08 PM EDT	Severe Thunderstorm Warning	PHI	Hunterdon, Middlesex, Morris, Somerset	31 min
May 26, 6:49 PM EDT	Special Marine Warning	PHI		56 min
May 26, 7:04 PM EDT	Special Marine Warning	PHI		26 min
May 26, 7:23 PM EDT	Special Marine Warning	PHI		97 min
May 26, 7:56 PM EDT	Special Marine Warning	PHI		71 min
May 26, 3:39 PM EDT	Severe Thunderstorm Warning	PHI	Berks	56 min
May 26, 4:10 PM EDT	Severe Thunderstorm Warning	PHI	Berks, Lehigh	65 min
May 26, 4:46 PM EDT	Severe Thunderstorm Warning	PHI	Berks, Bucks, Chester, Lehigh, Montgomery, Northampton	44 min
May 26, 4:52 PM EDT	Severe Thunderstorm Warning	PHI	Chester, Delaware, Montgomery	38 min
May 26, 5:37 PM EDT	Severe Thunderstorm Warning	PHI	Chester	53 min
May 26, 6:52 PM EDT	Severe Thunderstorm Warning	PHI	Berks	38 min

Nearby

Severe Thunderstorm Warnings in New Jersey, 2021 Severe Thunderstorm Warnings in Pennsylvania, 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.