Alert archive / New Jersey / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 104, NWS Philadelphia/Mount Holly

June 30, 2021Hunterdon County, Mercer County, New Jersey; Bucks County, Pennsylvania

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Jun 30, 2021, 8:37 PM EDT for Hunterdon County, Mercer County, New Jersey; Bucks County, Pennsylvania. It was in force for 38 min. 6 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: Jun 30, 2021, 8:37 PM EDT (00:37 UTC)
Expired: Jun 30, 2021, 9:15 PM EDT
In force: 38 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, Bucks County, PA

The radar

The Philadelphia radar (KDIX), 75 km from the middle of the area, began a volume at 00:37 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
Jun 30, 8:37 PM EDT	TSTM WND DMG	3 W Bedminster, PA	SEVERAL REPORTS OF DOWNED TREES AND WIRES NEAR NORTH RIDGE ROAD. TIME ESTIMATED FROM RADAR.
Jun 30, 8:39 PM EDT	TSTM WND DMG	1 Ene East Rockhill Twp, PA	DOWNED TREES AND WIRES NEAR DUBLIN PIKE AND 5TH STREET. TIME ESTIMATED FROM RADAR.
Jun 30, 8:41 PM EDT	TSTM WND DMG	1 Sw Dublin, PA	DOWNED TREES AND WIRES NEAR DUBLIN ROAD. TIME ESTIMATED FROM RADAR.
Jun 30, 8:41 PM EDT	TSTM WND GST 40	Doylestown Airport, PA
Jun 30, 8:56 PM EDT	TSTM WND DMG	2 Se Brownsburg, PA	DOWNED TREE ON TAYLORSVILLE ROAD. TIME ESTIMATED FROM RADAR.
Jun 30, 8:56 PM EDT	HAIL 0.5	Dublin, PA	REPORT FROM MPING: HALF-INCH (0.50 IN.).

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Brookhaven, NY (KOKX), launched 00:00Z, 0.6 hours before the alert went out and 199 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: 1308 J/kg
Mixed-layer CIN: -130 J/kg
Mixed-layer LCL: 1402 m above ground
0-6 km bulk shear: 21 kt
0-1 km storm-relative helicity: 81 m²/s²
0-3 km storm-relative helicity: 99 m²/s²
Significant tornado parameter: 0.1
Supercell composite: 2.1

Open this sounding in Storm Lab

The text

As transmitted.

222 
WUUS51 KPHI 010037
SVRPHI
NJC019-021-PAC017-010115-
/O.NEW.KPHI.SV.W.0104.210701T0037Z-210701T0115Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mount Holly NJ
837 PM EDT Wed Jun 30 2021

The National Weather Service in Mount Holly NJ has issued a

* Severe Thunderstorm Warning for...
  South central Hunterdon County in northwestern New Jersey...
  Northwestern Mercer County in central New Jersey...
  Central Bucks County in southeastern Pennsylvania...

* Until 915 PM EDT.

* At 837 PM EDT, a severe thunderstorm was located over Dublin, or 20
  miles southeast of Allentown, moving east at 30 mph.

  HAZARD...60 mph wind gusts.

  SOURCE...Radar indicated.

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

* Locations impacted include...
  Ewing, Perkasie, Doylestown, Byram, Bedminster, Flemington,
  Chalfont, Tinicum, New Hope, Dublin, Stockton, Washington Crossing,
  Fricks, Lumberville, Ottsville, Sergeantsville, Pipersville,
  Gardenville, Sand Brook and Erwinna.

This includes Interstate 295 in New Jersey between mile markers 73
and 76.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4027 7524 4032 7531 4046 7532 4054 7483
      4025 7479
TIME...MOT...LOC 0037Z 267DEG 28KT 4038 7522 

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

PO

1 follow-up statement

003 
WWUS51 KPHI 010057
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
857 PM EDT Wed Jun 30 2021

NJC019-021-PAC017-010115-
/O.CON.KPHI.SV.W.0104.000000T0000Z-210701T0115Z/
Hunterdon NJ-Mercer NJ-Bucks PA-
857 PM EDT Wed Jun 30 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 915 PM EDT
FOR SOUTH CENTRAL HUNTERDON...NORTHWESTERN MERCER AND CENTRAL BUCKS
COUNTIES...

At 857 PM EDT, a severe thunderstorm was located over Lumberville, or
17 miles northwest of Trenton, moving east at 30 mph.

HAZARD...60 mph wind gusts.

SOURCE...Radar indicated.

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

Locations impacted include...
Ewing, Doylestown, Byram, Flemington, Tinicum, New Hope, Stockton,
Washington Crossing, Sergeantsville, Pipersville, Gardenville,
Lumberville, Sand Brook, Lambertville, New Britain and Newtown Grant.

This includes Interstate 295 in New Jersey between mile markers 73
and 76.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4027 7518 4035 7520 4047 7512 4054 7483
      4025 7479
TIME...MOT...LOC 0057Z 267DEG 28KT 4039 7501 

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

PO

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 30, 8:56 PM EDT	Special Marine Warning	PHI		94 min
Jun 30, 9:05 PM EDT	Special Weather Statement	PHI	Somerset	40 min
Jun 30, 9:21 PM EDT	Special Weather Statement	PHI	Salem	39 min
Jun 30, 9:49 PM EDT	Special Weather Statement	PHI	Monmouth	26 min
Jun 30, 9:51 PM EDT	Special Marine Warning	PHI		60 min
Jul 1, 2:58 AM EDT	Small Craft Advisory	PHI		17 hr
Jul 1, 1:10 PM EDT	Special Weather Statement	PHI	Monmouth	50 min
Jul 1, 1:16 PM EDT	Special Weather Statement	PHI	Atlantic	29 min
Jul 1, 1:28 PM EDT	Special Marine Warning	PHI		62 min
Jul 1, 1:31 PM EDT	Special Weather Statement	PHI	Cumberland	29 min
Jul 1, 4:21 PM EDT	Special Marine Warning	PHI		114 min
Jul 1, 4:27 PM EDT	Severe Thunderstorm Warning	PHI	Burlington, Camden, Gloucester, Hunterdon, Mercer, Salem and 1 more	48 min
Jul 1, 4:55 PM EDT	Severe Thunderstorm Warning	PHI	Cape May, Cumberland, Salem	80 min
Jul 1, 4:59 PM EDT	Severe Thunderstorm Warning	PHI	Burlington, Camden, Gloucester, Mercer, Middlesex, Monmouth and 2 more	46 min
Jul 1, 5:02 PM EDT	Tornado Warning	PHI	Burlington, Mercer	28 min
Jul 1, 5:27 PM EDT	Severe Thunderstorm Warning	PHI	Atlantic, Burlington, Camden, Cape May, Cumberland, Gloucester and 5 more	93 min
Jul 1, 5:35 PM EDT	Tornado Warning	PHI	Mercer, Monmouth, Ocean	25 min
Jul 1, 5:40 PM EDT	Special Marine Warning	PHI		65 min
Jul 1, 5:46 PM EDT	Special Marine Warning	PHI		119 min
Jul 1, 6:13 PM EDT	Special Marine Warning	PHI		92 min
Jun 30, 8:16 PM EDT	Special Weather Statement	PHI	Bucks, Montgomery	44 min
Jul 1, 2:51 PM EDT	Special Weather Statement	PHI	Chester, Montgomery	39 min
Jul 1, 3:13 PM EDT	Severe Thunderstorm Warning	PHI	Berks, Bucks, Chester, Lehigh, Montgomery	47 min
Jul 1, 3:23 PM EDT	Areal Flood Advisory	PHI	Chester, Montgomery	77 min
Jul 1, 3:48 PM EDT	Areal Flood Advisory	PHI	Bucks, Delaware, Montgomery, Philadelphia	112 min
Jul 1, 3:50 PM EDT	Severe Thunderstorm Warning	PHI	Bucks, Chester, Delaware, Montgomery, Philadelphia	40 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.