Alert archive / New Jersey / Severe Thunderstorm Warnings in 2018

Severe Thunderstorm Warning 107, NWS Philadelphia/Mount Holly

October 2, 2018Bucks County, Pennsylvania; 5 counties in New Jersey

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Oct 2, 2018, 10:43 PM EDT for Bucks County, Pennsylvania; 5 counties in New Jersey. It was in force for 37 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: Oct 2, 2018, 10:43 PM EDT (02:43 UTC)
Expired: Oct 2, 2018, 11:20 PM EDT
In force: 37 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Burlington County, NJ, Mercer County, NJ, Middlesex County, NJ, Monmouth County, NJ, Ocean County, NJ, Bucks County, PA

The radar

The Philadelphia radar (KDIX), 33 km from the middle of the area, began a volume at 02:45 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
Oct 2, 10:55 PM EDT	TSTM WND DMG	Ewing, NJ	TREE UPROOTED ONTO A HOUSE ON KING AVE. MINOR STRUCTURAL DAMAGE. DOWNED POWER LINES IN AREA.

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, 2.7 hours before the alert went out and 168 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: 610 J/kg
Mixed-layer CIN: -52 J/kg
Mixed-layer LCL: 634 m above ground
0-6 km bulk shear: 36 kt
0-1 km storm-relative helicity: 197 m²/s²
0-3 km storm-relative helicity: 213 m²/s²
Significant tornado parameter: 0.5
Supercell composite: 3.5

Open this sounding in Storm Lab

The text

As transmitted.

299 
WUUS51 KPHI 030243
SVRPHI
NJC005-021-023-025-029-PAC017-030330-
/O.NEW.KPHI.SV.W.0107.181003T0243Z-181003T0330Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mount Holly NJ
1043 PM EDT TUE OCT 2 2018

The National Weather Service in Mount Holly NJ has issued a

* Severe Thunderstorm Warning for...
  Northwestern Ocean County in southern New Jersey...
  Mercer County in central New Jersey...
  Northeastern Burlington County in southern New Jersey...
  South central Middlesex County in northern New Jersey...
  Southwestern Monmouth County in central New Jersey...
  Southeastern Bucks County in southeastern Pennsylvania...

* Until 1130 PM EDT.

* At 1042 PM EDT, a severe thunderstorm was located over Woodside, or
  near Trenton, moving east at 50 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...
  Toms River, Trenton, Lakewood, Jackson, Howell, Manalapan, Ewing,
  Florence, Burlington, Bristol, Hightstown, Bordentown, Lakehurst,
  Pennington, New Hope, Yardley, Newtown, Tullytown, Allentown and
  Langhorne.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

In addition to large hail and damaging winds, frequent cloud to
ground lightning is occurring with this storm. Move indoors
immediately. Remember, if you can hear thunder, you are close enough
to be struck by lightning.

Torrential rainfall is occurring with this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.

&&

LAT...LON 3991 7427 4016 7504 4036 7495 4034 7494
      4035 7488 4023 7414
TIME...MOT...LOC 0242Z 287DEG 43KT 4022 7487 

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

Fitzsimmons

1 follow-up statement

543 
WWUS51 KPHI 030320
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
1120 PM EDT TUE OCT 2 2018

NJC005-021-023-025-029-PAC017-030328-
/O.CAN.KPHI.SV.W.0107.000000T0000Z-181003T0330Z/
Ocean NJ-Mercer NJ-Burlington NJ-Middlesex NJ-Monmouth NJ-Bucks PA-
1120 PM EDT TUE OCT 2 2018

...THE SEVERE THUNDERSTORM WARNING FOR NORTHWESTERN OCEAN...MERCER...
NORTHEASTERN BURLINGTON...SOUTH CENTRAL MIDDLESEX...SOUTHWESTERN
MONMOUTH AND SOUTHEASTERN BUCKS COUNTIES IS CANCELLED...
                
The storm which prompted the warning has weakened below severe 
limits. Therefore, the warning has been cancelled.  However small 
hail, gusty winds and very heavy rain are still possible with this 
thunderstorm as it moves across central New Jersey. 

LAT...LON 3991 7427 4016 7504 4036 7495 4034 7494
      4035 7488 4023 7414
TIME...MOT...LOC 0317Z 287DEG 43KT 4009 7432 

$$

Fitzsimmons

The office that day

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

Issued	Product	Office	Counties	Lasted
Oct 2, 8:29 PM EDT	Areal Flood Advisory	PHI	Carbon, Monroe	4 hr
Oct 2, 9:05 PM EDT	Areal Flood Advisory	PHI	Berks, Lehigh, Northampton	4 hr
Oct 2, 9:51 PM EDT	Special Weather Statement	PHI	Bucks, Chester, Delaware, Montgomery, Philadelphia	114 min
Oct 2, 8:38 PM EDT	Tornado Warning	PHI	Morris, Sussex	22 min
Oct 2, 8:56 PM EDT	Severe Thunderstorm Warning	PHI	Morris, Sussex, Warren	49 min
Oct 2, 11:24 PM EDT	Special Weather Statement	PHI	Burlington, Monmouth, Ocean	51 min
Oct 2, 11:32 PM EDT	Special Marine Warning	PHI		58 min
Oct 3, 12:00 AM EDT	Special Weather Statement	PHI	Atlantic, Camden, Cape May, Cumberland, Gloucester, Salem	60 min
Oct 3, 12:25 AM EDT	Special Marine Warning	PHI		65 min
Oct 3, 3:16 AM EDT	Small Craft Advisory for Hazardous Seas	PHI		12 hr

Nearby

Severe Thunderstorm Warnings in New Jersey, 2018 Severe Thunderstorm Warnings in Pennsylvania, 2018 Every severe thunderstorm warning in 2018

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.