Alert archive / New Jersey / Severe Thunderstorm Warnings in 2020

Severe Thunderstorm Warning 219, NWS Philadelphia/Mount Holly

August 7, 2020Bucks County, Pennsylvania; Burlington County, Hunterdon County, Mercer County, New Jersey

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Aug 7, 2020, 6:39 PM EDT for Bucks County, Pennsylvania; Burlington County, Hunterdon County, Mercer County, New Jersey. It was in force for 27 min. 1 report 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: Aug 7, 2020, 6:39 PM EDT (22:39 UTC)
Expired: Aug 7, 2020, 7:06 PM EDT
In force: 27 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

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

The radar

The Philadelphia radar (KDIX), 39 km from the middle of the area, began a volume at 22:39 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
Aug 7, 6:50 PM EDT	TSTM WND DMG	Yardley, PA	SEVERAL TREES AND WIRES REPORTED DOWN IN THE AREA OF YARDLEY AND WOODSIDE. TIME ESTIMATED FROM RADAR.

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 12:00Z, 10.7 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 1352 m above ground
0-6 km bulk shear: 21 kt
0-1 km storm-relative helicity: -4 m²/s²
0-3 km storm-relative helicity: 79 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

239 
WUUS51 KPHI 072239
SVRPHI
NJC005-019-021-PAC017-072330-
/O.NEW.KPHI.SV.W.0219.200807T2239Z-200807T2330Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mount Holly NJ
639 PM EDT Fri Aug 7 2020

The National Weather Service in Mount Holly NJ has issued a

* Severe Thunderstorm Warning for...
  South central Hunterdon County in northwestern New Jersey...
  Mercer County in central New Jersey...
  North central Burlington County in southern New Jersey...
  Southeastern Bucks County in southeastern Pennsylvania...

* Until 730 PM EDT.

* At 638 PM EDT, a severe thunderstorm was located over Washington
  Crossing, or 8 miles northwest of Trenton, moving southeast at 20
  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...
  Trenton, Ewing, Princeton, Florence, Bordentown, Pennington, New
  Hope, Yardley, Newtown, Tullytown, Langhorne, Washington Crossing,
  Windsor, Florence-Roebling, Woodside, Georgetown, Richboro,
  Edinburg, Crosswicks and White Horse.

This includes the following highways...
 New Jersey Turnpike between exits 6 and 8.
 Pennsylvania Turnpike between mile markers 358 and 359.
 Interstate 195 in New Jersey between mile markers 0 and 7.
 Interstate 295 in New Jersey between mile markers 52 and 76.

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.

This severe thunderstorm may contain little or no lightning. Do not
wait until you hear thunder before taking cover.

&&

LAT...LON 4018 7460 4018 7461 4017 7460 4002 7467
      4024 7506 4044 7494 4031 7458 4029 7455
TIME...MOT...LOC 2238Z 294DEG 19KT 4029 7491 

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

Robertson

1 follow-up statement

718 
WWUS51 KPHI 072306 RRA
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
706 PM EDT Fri Aug 7 2020

NJC005-019-021-PAC017-072316-
/O.CAN.KPHI.SV.W.0219.000000T0000Z-200807T2330Z/
Hunterdon NJ-Mercer NJ-Burlington NJ-Bucks PA-
706 PM EDT Fri Aug 7 2020

...THE SEVERE THUNDERSTORM WARNING FOR SOUTH CENTRAL HUNTERDON...
MERCER...NORTH CENTRAL BURLINGTON AND SOUTHEASTERN BUCKS COUNTIES IS
CANCELLED...
                
The storm which prompted the warning has weakened below severe
limits, and no longer poses an immediate threat to life or property.
Therefore, the warning has been cancelled. However gusty winds and 
heavy rain are still possible with this thunderstorm.

LAT...LON 4018 7460 4018 7461 4017 7460 4002 7467
      4024 7506 4044 7494 4031 7458 4029 7455
TIME...MOT...LOC 2303Z 294DEG 19KT 4023 7473 

$$

Robertson

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 7, 6:49 AM EDT	Areal Flood Advisory	PHI	Berks	4 hr
Aug 7, 9:22 AM EDT	Areal Flood Advisory	PHI	Bucks	3 hr
Aug 7, 10:34 AM EDT	Severe Thunderstorm Warning	PHI	Carbon, Lehigh	56 min
Aug 7, 11:28 AM EDT	Special Weather Statement	PHI	Carbon, Lehigh	47 min
Aug 7, 2:34 PM EDT	Areal Flood Advisory	PHI	Berks	4 hr
Aug 7, 3:46 PM EDT	Areal Flood Advisory	PHI	Carbon, Lehigh, Northampton	4 hr
Aug 7, 4:10 PM EDT	Flash Flood Warning	PHI	Berks	2 hr
Aug 7, 4:20 PM EDT	Areal Flood Advisory	PHI	Chester, Montgomery	4 hr
Aug 7, 4:32 PM EDT	Flash Flood Warning	PHI	Chester	3 hr
Aug 7, 4:47 PM EDT	Special Weather Statement	PHI	Chester	28 min
Aug 7, 5:00 PM EDT	Severe Thunderstorm Warning	PHI	Chester	60 min
Aug 7, 5:03 PM EDT	Flash Flood Warning	PHI	Chester, Delaware	5 hr
Aug 7, 5:15 PM EDT	Areal Flood Advisory	PHI	Bucks	3 hr
Aug 7, 5:25 PM EDT	Areal Flood Advisory	PHI	Bucks, Montgomery, Philadelphia	3 hr
Aug 7, 5:38 PM EDT	Severe Thunderstorm Warning	PHI	Chester, Delaware, Montgomery, Philadelphia	52 min
Aug 7, 5:43 PM EDT	Flash Flood Warning	PHI	Montgomery, Philadelphia	4 hr
Aug 7, 5:49 PM EDT	Tornado Warning	PHI	Chester, Delaware	26 min
Aug 7, 5:57 PM EDT	Severe Thunderstorm Warning	PHI	Delaware, Philadelphia	48 min
Aug 7, 6:00 PM EDT	Tornado Warning	PHI	Delaware	30 min
Aug 7, 7:10 PM EDT	River Flood Warning	PHI	Delaware	7 hr
Aug 7, 7:17 PM EDT	Areal Flood Warning	PHI	Bucks, Montgomery	3 hr
Aug 7, 6:08 PM EDT	Areal Flood Advisory	PHI	Cumberland, Gloucester, Salem	3 hr
Aug 7, 6:16 PM EDT	Areal Flood Advisory	PHI	Mercer	2 hr
Aug 7, 6:24 PM EDT	Special Marine Warning	PHI		66 min
Aug 7, 6:41 PM EDT	Severe Thunderstorm Warning	PHI	Atlantic, Camden, Cumberland, Gloucester, Salem	49 min
Aug 7, 6:57 PM EDT	Severe Thunderstorm Warning	PHI	Atlantic, Camden, Cumberland, Gloucester, Salem	48 min
Aug 7, 7:24 PM EDT	Special Marine Warning	PHI		66 min
Aug 7, 7:25 PM EDT	Flash Flood Warning	PHI	Atlantic, Cape May, Cumberland, Gloucester	4 hr
Aug 7, 7:28 PM EDT	Severe Thunderstorm Warning	PHI	Atlantic, Burlington, Camden, Cape May, Cumberland, Gloucester and 1 more	62 min

Nearby

Severe Thunderstorm Warnings in New Jersey, 2020 Severe Thunderstorm Warnings in Pennsylvania, 2020 Every severe thunderstorm warning in 2020

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.