Alert archive / New Jersey / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 2, NWS Philadelphia/Mount Holly

March 28, 20216 counties in New Jersey; Bucks County, Montgomery County, Pennsylvania

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Mar 28, 2021, 6:43 PM EDT for 6 counties in New Jersey; Bucks County, Montgomery County, Pennsylvania. It was in force for 47 min. 15 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: Mar 28, 2021, 6:43 PM EDT (22:43 UTC)
Expired: Mar 28, 2021, 7:30 PM EDT
In force: 47 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, Morris County, NJ, Somerset County, NJ, Warren County, NJ, Bucks County, PA, Montgomery County, PA

The radar

The Philadelphia radar (KDIX), 76 km from the middle of the area, began a volume at 22:42 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
Mar 28, 6:52 PM EDT	TSTM WND DMG	3 Nnw Sergeantsville, NJ	DOWNED TREES AND WIRES NEAR LOCKTOWN ROAD. TIME ESTIMATED FROM RADAR.
Mar 28, 6:54 PM EDT	TSTM WND DMG	1 W Sergeantsville, NJ	DOWNED TREES AND WIRES NEAR ROSEMONT RINGOES ROAD. TIME ESTIMATED FROM RADAR.
Mar 28, 6:57 PM EDT	TSTM WND DMG	2 E Delaware Twp, NJ	TREE AND WIRES DOWN NEAR EAST AMWELL. TIME ESTIMATED FROM RADAR.
Mar 28, 7:00 PM EDT	TSTM WND DMG	West Amwell Twp, NJ	TREE AND WIRES DOWN IN WEST AMWELL. TIME ESTIMATED FROM RADAR.
Mar 28, 7:06 PM EDT	TSTM WND DMG	2 Wsw Langhorne, PA	DOWNED TREE LIMBS AND WIRES NEAR ARROWHEAD DRIVE. TIME ESTIMATED FROM RADAR.
Mar 28, 7:06 PM EDT	TSTM WND DMG	Yardley, PA	DOWNED WIRES REPORTED IN A FEW LOCATIONS BETWEEN YARDLEY AND MORRISVILLE. TIME ESTIMATED FROM RADAR.
Mar 28, 7:08 PM EDT	TSTM WND DMG	2 E Feasterville-Trevos, PA	DOWNED TREE LIMBS AND WIRES NEAR CANTERBERRY COURT. TIME ESTIMATED FROM RADAR.
Mar 28, 7:09 PM EDT	TSTM WND DMG	1 Nw Skillman, NJ	DOWNED TREE LIMBS AND WIRES NEAR SERVIS ROAD. TIME ESTIMATED FROM RADAR.
Mar 28, 7:09 PM EDT	TSTM WND DMG	1 Se Neshanic Station, NJ	DOWNED TREES AND WIRES NEAR ZION ROAD IN NESHANIC. TIME ESTIMATED FROM RADAR.
Mar 28, 7:09 PM EDT	TSTM WND DMG	2 Ese Hopewell, NJ	DOWNED TREE LIMBS AND WIRES NEAR PROVINCE LINE ROAD. TIME ESTIMATED FROM RADAR.
Mar 28, 7:09 PM EDT	TSTM WND DMG	2 W Prospect Park, NJ	SEVERAL REPORTS OF DOWNED TREE LIMBS AND WIRES NEAR SANHICAN DRIVE. TIME ESTIMATED FROM RADAR.
Mar 28, 7:12 PM EDT	TSTM WND DMG	Hillsborough Twp, NJ	SIX TO EIGHT POWER POLES AND AROUND 10 TREES REPORTED DOWN IN HILLSBOROUGH. TIME ESTIMATED FROM RADAR.
Mar 28, 7:14 PM EDT	TSTM WND DMG	1 N Montgomery Twp, NJ	A FEW REPORTS OF DOWNED TREES AND WIRES ON THE NORTH SIDE OF MONTGOMERY TWP. TIME ESTIMATED FROM RADAR.
Mar 28, 7:15 PM EDT	TSTM WND DMG	2 E Belle Mead, NJ	DOWNED TREES AND WIRES NEAR WILLOW ROAD. TIME ESTIMATED FROM RADAR.
Mar 28, 7:15 PM EDT	TSTM WND GST 63	Trenton, NJ	63 MPH THUNDERSTORM WIND GUST MEASURED VIA A HOME WEATHER STATION.

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
Mar 28, 5:05 PM EDT	Severe Thunderstorm Watch	SPC	4 hr

The nearest sounding before it

Brookhaven, NY (KOKX), launched 12:00Z, 10.7 hours before the alert went out and 144 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 666 m above ground
0-6 km bulk shear: 41 kt
0-1 km storm-relative helicity: 165 m²/s²
0-3 km storm-relative helicity: 285 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

037 
WUUS51 KPHI 282243
SVRPHI
NJC019-021-023-027-035-041-PAC017-091-282330-
/O.NEW.KPHI.SV.W.0002.210328T2243Z-210328T2330Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mount Holly NJ
643 PM EDT Sun Mar 28 2021

The National Weather Service in Mount Holly NJ has issued a

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

* Until 730 PM EDT.

* At 642 PM EDT, severe thunderstorms were located along a line
  extending from near Beatyestown to near Lansdale, moving east at 40
  mph.

  HAZARD...60 mph wind gusts.

  SOURCE...Radar indicated.

  IMPACT...Damage to roofs, siding, trees, and power lines is 
           possible.

* Locations impacted include...
  Trenton, Morristown, Somerville, Bridgewater, Ewing, Lansdale,
  Madison, Middlesex, East Norriton, Princeton, Florham Park, East
  Hanover, Bound Brook, Manville, Chatham, Doylestown, Byram,
  Hatboro, Bedminster and Washington.

This includes the following highways...
 Pennsylvania Turnpike between mile markers 340 and 352, and between
mile markers 354 and 357.
 Northeast Extension between mile markers 23 and 27.
 Interstate 78 in New Jersey between mile markers 10 and 43.
 Interstate 195 in New Jersey near mile marker 0.
 Interstate 295 in New Jersey between mile markers 60 and 76.
 Interstate 287 in New Jersey between mile markers 9 and 39.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of 
a building. This severe thunderstorm may contain little or no 
lightning. Do not wait until you hear thunder before taking cover.

&&

LAT...LON 4082 7434 4079 7437 4076 7438 4075 7436
      4074 7437 4067 7446 4066 7445 4067 7441
      4013 7475 4012 7478 4015 7537 4082 7494
      4084 7433
TIME...MOT...LOC 2242Z 272DEG 33KT 4081 7490 4021 7527 

HAIL...<.75IN
WIND...60MPH
 
$$

Staarmann

2 follow-up statements

607 
WWUS51 KPHI 282256
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
656 PM EDT Sun Mar 28 2021

NJC041-282305-
/O.CAN.KPHI.SV.W.0002.000000T0000Z-210328T2330Z/
Warren NJ-
656 PM EDT Sun Mar 28 2021

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN WARREN 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 900 PM EDT for
southern and central New Jersey...and southeastern Pennsylvania.

LAT...LON 4082 7434 4079 7437 4076 7438 4075 7436
      4074 7437 4067 7446 4066 7445 4067 7441
      4013 7475 4012 7478 4015 7520 4082 7479
      4084 7433
TIME...MOT...LOC 2255Z 274DEG 34KT 4076 7476 4049 7493 4021 7512 

$$

NJC019-021-023-027-035-PAC017-091-282330-
/O.CON.KPHI.SV.W.0002.000000T0000Z-210328T2330Z/
Morris NJ-Hunterdon NJ-Mercer NJ-Somerset NJ-Middlesex NJ-
Montgomery PA-Bucks PA-
656 PM EDT Sun Mar 28 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 730 PM EDT
FOR SOUTHERN MORRIS...HUNTERDON...MERCER...SOMERSET...NORTHWESTERN
MIDDLESEX...EAST CENTRAL MONTGOMERY AND SOUTHEASTERN BUCKS
COUNTIES...

At 655 PM EDT, severe thunderstorms were located along a line
extending from near Long Valley to Sand Brook to near Hatboro, moving
east at 40 mph.

HAZARD...60 mph wind gusts.

SOURCE...Radar indicated.

IMPACT...Damage to roofs, siding, trees, and power lines is 
         possible.

Locations impacted include...
Trenton, Morristown, Somerville, Bridgewater, Ewing, Madison,
Middlesex, Princeton, Florham Park, East Hanover, Bound Brook,
Manville, Chatham, Hatboro, Morris Plains, Mendham, Flemington, High
Bridge, Clinton and Pennington.

This includes the following highways...
 Pennsylvania Turnpike between mile markers 341 and 350, and between
mile markers 355 and 356.
 Interstate 78 in New Jersey between mile markers 18 and 43.
 Interstate 195 in New Jersey near mile marker 0.
 Interstate 295 in New Jersey between mile markers 60 and 76.
 Interstate 287 in New Jersey between mile markers 9 and 39.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of 
a building. This severe thunderstorm may contain little or no 
lightning. Do not wait until you hear thunder before taking cover.

&&

LAT...LON 4082 7434 4079 7437 4076 7438 4075 7436
      4074 7437 4067 7446 4066 7445 4067 7441
      4013 7475 4012 7478 4015 7520 4082 7479
      4084 7433
TIME...MOT...LOC 2255Z 274DEG 34KT 4076 7476 4049 7493 4021 7512 

HAIL...<.75IN
WIND...60MPH
 
$$

Staarmann

731 
WWUS51 KPHI 282313
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
713 PM EDT Sun Mar 28 2021

NJC019-PAC091-282322-
/O.CAN.KPHI.SV.W.0002.000000T0000Z-210328T2330Z/
Hunterdon NJ-Montgomery PA-
713 PM EDT Sun Mar 28 2021

...THE SEVERE THUNDERSTORM WARNING FOR HUNTERDON AND EAST CENTRAL
MONTGOMERY COUNTIES 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 900 PM EDT for
southern and central New Jersey...and southeastern Pennsylvania.

LAT...LON 4076 7438 4075 7436 4067 7446 4066 7445
      4067 7443 4066 7442 4014 7474 4012 7478
      4014 7495 4042 7479 4043 7475 4046 7477
      4083 7457 4084 7433
TIME...MOT...LOC 2312Z 267DEG 38KT 4077 7452 4051 7467 4022 7480 

$$

NJC021-023-027-035-PAC017-282330-
/O.CON.KPHI.SV.W.0002.000000T0000Z-210328T2330Z/
Morris NJ-Mercer NJ-Somerset NJ-Middlesex NJ-Bucks PA-
713 PM EDT Sun Mar 28 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 730 PM EDT
FOR SOUTHEASTERN MORRIS...CENTRAL MERCER...SOMERSET...NORTHWESTERN
MIDDLESEX AND SOUTHEASTERN BUCKS COUNTIES...

At 712 PM EDT, severe thunderstorms were located along a line
extending from near Morristown to Flagtown to Trenton, moving east at
45 mph.

HAZARD...60 mph wind gusts.

SOURCE...Radar indicated.

IMPACT...Damage to roofs, siding, trees, and power lines is 
         possible.

Locations impacted include...
Trenton, Morristown, Somerville, Bridgewater, Ewing, Madison,
Middlesex, Princeton, Florham Park, East Hanover, Bound Brook,
Manville, Chatham, Morris Plains, Mendham, Pennington, Peapack And
Gladstone, Yardley, Hopewell and Tullytown.

This includes the following highways...
 Interstate 78 in New Jersey between mile markers 30 and 42.
 Interstate 195 in New Jersey near mile marker 0.
 Interstate 295 in New Jersey between mile markers 60 and 76.
 Interstate 287 in New Jersey between mile markers 9 and 39.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of 
a building. This severe thunderstorm may contain little or no 
lightning. Do not wait until you hear thunder before taking cover.

&&

LAT...LON 4076 7438 4075 7436 4067 7446 4066 7445
      4067 7443 4066 7442 4014 7474 4012 7478
      4014 7495 4042 7479 4043 7475 4046 7477
      4083 7457 4084 7433
TIME...MOT...LOC 2312Z 267DEG 38KT 4077 7452 4051 7467 4022 7480 

HAIL...<.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
Mar 28, 2:39 AM EDT	Gale Warning	PHI		35 hr
Mar 28, 6:21 PM EDT	Special Marine Warning	PHI		54 min
Mar 28, 6:47 PM EDT	Severe Thunderstorm Warning	PHI	Burlington, Camden, Gloucester, Mercer, Monmouth, Salem	43 min
Mar 28, 7:17 PM EDT	Severe Thunderstorm Warning	PHI	Mercer, Middlesex, Monmouth, Ocean, Somerset	60 min
Mar 28, 7:20 PM EDT	Severe Thunderstorm Warning	PHI	Atlantic, Burlington, Camden, Gloucester, Monmouth, Ocean	70 min
Mar 28, 7:38 PM EDT	Special Marine Warning	PHI		111 min
Mar 28, 5:04 PM EDT	Special Weather Statement	PHI	Berks	41 min
Mar 28, 5:13 PM EDT	Special Weather Statement	PHI	Carbon	32 min
Mar 28, 5:45 PM EDT	Special Weather Statement	PHI	Berks, Lehigh	30 min
Mar 28, 6:02 PM EDT	Special Weather Statement	PHI	Chester	28 min
Mar 28, 6:12 PM EDT	Severe Thunderstorm Warning	PHI	Chester, Delaware, Montgomery	48 min
Mar 28, 6:15 PM EDT	Special Weather Statement	PHI	Montgomery	30 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.