Alert archive / New Jersey / Severe Thunderstorm Warnings in 2019

Severe Thunderstorm Warning 36, NWS Philadelphia/Mount Holly

May 19, 20195 counties in New Jersey; 4 counties in Pennsylvania

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at May 19, 2019, 9:46 PM EDT for 5 counties in New Jersey; 4 counties in Pennsylvania. It was in force for 44 min. 3 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 19, 2019, 9:46 PM EDT (01:46 UTC)
Expired: May 19, 2019, 10:30 PM EDT
In force: 44 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon
Tornado: Possible
Hail: 1.0 in
Wind: 60.0 mph

Counties Hunterdon County, NJ, Mercer County, NJ, Morris County, NJ, Somerset County, NJ, Warren County, NJ, Bucks County, PA, Chester County, PA, Montgomery County, PA, Northampton County, PA

The radar

The Philadelphia radar (KDIX), 87 km from the middle of the area, began a volume at 01:46 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 19, 9:46 PM EDT	TSTM WND DMG	Pohatcong Twp, NJ	NUMEROUS TREES AND POWER LINES REPORTED DOWN ACROSS THE TOWNSHIP.
May 19, 9:51 PM EDT	TSTM WND DMG	2 Ne Ottsville, PA	CALLER REPORTS DOZENS OF TREES UPROOTED AND DAMAGED ON HIS PROPERTY WITH POWER POLES AND LINES DOWN AS WELL. TIME ESTIMATED FROM RADAR.
May 19, 9:51 PM EDT	TORNADO	2 Ne Ottsville, PA	A STORM SURVEY TEAM DETERMINED A TORNADO BRIEFLY TOUCHED DOWN OVER THE BEAVER VALLEY CAMPGROUNDS IN TINICUM TOWNSHIP, BUCKS COUNTY, PA NEAR OTTSVILLE ON SUNDAY EVENING. THE TORNADO TRACKED FROM SOUTHWEST TO NORTHEAST ACROSS THE PROPERTY FOR APPROXIMATELY ONE Q

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 19, 2:36 PM EDT	Severe Thunderstorm Watch	SPC	8 hr

The nearest sounding before it

Brookhaven, NY (KOKX), launched 00:00Z, 1.8 hours before the alert went out and 207 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: 61 J/kg
Mixed-layer CIN: -284 J/kg
Mixed-layer LCL: 581 m above ground
0-6 km bulk shear: 18 kt
0-1 km storm-relative helicity: 147 m²/s²
0-3 km storm-relative helicity: 224 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.7

Open this sounding in Storm Lab

The text

As transmitted.

664 
WUUS51 KPHI 200146
SVRPHI
NJC019-021-027-035-041-PAC017-029-091-095-200230-
/O.NEW.KPHI.SV.W.0036.190520T0146Z-190520T0230Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mount Holly NJ
946 PM EDT Sun May 19 2019

The National Weather Service in Mount Holly NJ has issued a

* Severe Thunderstorm Warning for...
  Southwestern Morris County in northern New Jersey...
  Hunterdon County in northwestern New Jersey...
  Southwestern Warren County in northwestern New Jersey...
  Northwestern Mercer County in central New Jersey...
  Western Somerset County in northern New Jersey...
  Montgomery County in southeastern Pennsylvania...
  Bucks County in southeastern Pennsylvania...
  Northeastern Chester County in southeastern Pennsylvania...
  Southeastern Northampton County in eastern Pennsylvania...

* Until 1030 PM EDT.

* At 946 PM EDT, severe thunderstorms were located along a line
  extending from Alpha to Hatfield to near Elverson, moving east at
  40 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...
  Easton, Bridgewater, Ewing, Norristown, Pottstown, Phoenixville,
  Lansdale, West Norriton, East Norriton, Quakertown, Perkasie,
  Doylestown, Byram, Wilson, Hatboro, Souderton, Bedminster,
  Washington, Ambler and Collegeville.

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 these storms. Move indoors
immediately. Remember, if you can hear thunder, you are close enough
to be struck by lightning.

&&

LAT...LON 4039 7546 4072 7520 4081 7458 4028 7471
      4009 7536 4011 7594
TIME...MOT...LOC 0146Z 258DEG 33KT 4066 7516 4029 7529 4013 7579 

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

Robertson

1 follow-up statement

507 
WWUS51 KPHI 200208
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
1008 PM EDT Sun May 19 2019

PAC029-095-200218-
/O.CAN.KPHI.SV.W.0036.000000T0000Z-190520T0230Z/
Chester PA-Northampton PA-
1008 PM EDT Sun May 19 2019

...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN CHESTER AND
SOUTHEASTERN NORTHAMPTON 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 1100 PM EDT for
central, northern and northwestern New Jersey...and eastern and
southeastern Pennsylvania.

LAT...LON 4028 7471 4020 7517 4022 7559 4024 7560
      4023 7562 4051 7533 4061 7520 4074 7508
      4081 7458
TIME...MOT...LOC 0208Z 257DEG 33KT 4070 7491 4033 7505 4021 7559 

$$

NJC019-021-027-035-041-PAC017-091-200230-
/O.CON.KPHI.SV.W.0036.000000T0000Z-190520T0230Z/
Morris NJ-Hunterdon NJ-Warren NJ-Mercer NJ-Somerset NJ-Montgomery PA-
Bucks PA-
1008 PM EDT Sun May 19 2019

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1030 PM EDT
FOR SOUTHWESTERN MORRIS...HUNTERDON...SOUTHWESTERN WARREN...
NORTHWESTERN MERCER...WESTERN SOMERSET...CENTRAL MONTGOMERY AND BUCKS
COUNTIES...

At 1008 PM EDT, severe thunderstorms were located along a line
extending from Glen Gardner to near Gardenville to near Royersford,
moving east at 40 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...
Bridgewater, Ewing, Lansdale, Quakertown, Perkasie, Doylestown,
Byram, Souderton, Bedminster, Washington, Mendham, Flemington,
Chalfont, Tinicum, High Bridge, Hatfield, Clinton, Pennington,
Peapack And Gladstone and New Hope.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4028 7471 4020 7517 4022 7559 4024 7560
      4023 7562 4051 7533 4061 7520 4074 7508
      4081 7458
TIME...MOT...LOC 0208Z 257DEG 33KT 4070 7491 4033 7505 4021 7559 

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

Robertson

The office that day

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

Issued	Product	Office	Counties	Lasted
May 19, 10:27 PM EDT	Severe Thunderstorm Warning	PHI	Hunterdon, Mercer, Middlesex, Monmouth, Morris, Ocean and 1 more	48 min
May 19, 10:34 PM EDT	Areal Flood Advisory	PHI	Hunterdon, Mercer, Middlesex, Morris, Somerset, Sussex and 1 more	3 hr
May 19, 11:41 PM EDT	Severe Thunderstorm Warning	PHI	Warren	53 min
May 20, 1:03 AM EDT	Special Weather Statement	PHI	Morris, Warren	57 min
May 19, 8:14 PM EDT	Special Weather Statement	PHI	Lehigh	46 min
May 19, 8:35 PM EDT	Tornado Warning	PHI	Berks	25 min
May 19, 8:37 PM EDT	Severe Thunderstorm Warning	PHI	Berks, Lehigh, Montgomery	38 min
May 19, 8:43 PM EDT	Flash Flood Warning	PHI	Berks	3 hr
May 19, 9:09 PM EDT	Severe Thunderstorm Warning	PHI	Berks, Bucks, Chester, Lehigh, Montgomery, Northampton	51 min
May 19, 9:29 PM EDT	Flash Flood Warning	PHI	Berks, Bucks, Lehigh, Montgomery, Northampton	4 hr
May 19, 10:48 PM EDT	Flash Flood Warning	PHI	Berks	117 min
May 19, 11:00 PM EDT	Severe Thunderstorm Warning	PHI	Berks, Carbon, Lehigh, Monroe, Northampton	60 min
May 19, 11:15 PM EDT	Flash Flood Warning	PHI	Carbon, Lehigh, Monroe, Northampton	3 hr
May 19, 11:54 PM EDT	Severe Thunderstorm Warning	PHI	Lehigh, Northampton	39 min
May 20, 12:57 AM EDT	Areal Flood Advisory	PHI	Berks	3 hr
May 20, 1:21 AM EDT	Areal Flood Advisory	PHI	Berks, Montgomery	3 hr

Nearby

Severe Thunderstorm Warnings in New Jersey, 2019 Severe Thunderstorm Warnings in Pennsylvania, 2019 Every severe thunderstorm warning in 2019

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.