Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2019

Severe Thunderstorm Warning 10, NWS Philadelphia/Mount Holly

April 15, 2019Hunterdon County, Warren County, New Jersey; 4 counties in Pennsylvania

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Apr 15, 2019, 3:03 AM EDT for Hunterdon County, Warren County, New Jersey; 4 counties in Pennsylvania. It was in force for 20 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Apr 15, 2019, 3:03 AM EDT (07:03 UTC)
Expired: Apr 15, 2019, 3:23 AM EDT
In force: 20 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon
Tornado: Possible
Hail: 0.75 in
Wind: 60.0 mph

Counties Hunterdon County, NJ, Warren County, NJ, Bucks County, PA, Lehigh County, PA, Montgomery County, PA, Northampton County, PA

The radar

The Philadelphia radar (KDIX), 83 km from the middle of the area, began a volume at 07:02 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.

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Apr 15, 1:05 AM EDT	Tornado Watch	SPC	5 hr

The nearest sounding before it

Brookhaven, NY (KOKX), launched 00:00Z, 7.1 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: 7 J/kg
Mixed-layer CIN: -95 J/kg
Mixed-layer LCL: 437 m above ground
0-6 km bulk shear: 57 kt
0-1 km storm-relative helicity: 236 m²/s²
0-3 km storm-relative helicity: 268 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.2

Open this sounding in Storm Lab

The text

As transmitted.

783 
WUUS51 KPHI 150703
SVRPHI
NJC019-041-PAC017-077-091-095-150745-
/O.NEW.KPHI.SV.W.0010.190415T0703Z-190415T0745Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mount Holly NJ
303 AM EDT MON APR 15 2019

The National Weather Service in Mount Holly NJ has issued a

* Severe Thunderstorm Warning for...
  Hunterdon County in northwestern New Jersey...
  Southwestern Warren County in northwestern New Jersey...
  North central Montgomery County in southeastern Pennsylvania...
  Southeastern Lehigh County in eastern Pennsylvania...
  Northwestern Bucks County in southeastern Pennsylvania...
  Southeastern Northampton County in eastern Pennsylvania...

* Until 345 AM EDT.

* At 302 AM EDT, severe thunderstorms were located along a line
  extending from Old Orchard to near Quakertown, moving east at 45
  mph.

  HAZARD...60 mph wind gusts and penny size hail.

  SOURCE...Radar indicated.

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

* Locations impacted include...
  Easton, Bethlehem, Forks, Quakertown, Perkasie, Byram, Wilson,
  Bedminster, Washington, Hellertown, Flemington, Tinicum, High
  Bridge, Clinton, Alpha, Glen Gardner, Ferndale, Hampton, Frenchtown
  and Lebanon.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Intense thunderstorm lines can produce brief tornadoes and widespread
significant wind damage. Although a tornado is not immediately
likely, it is best to move to an interior room on the lowest floor of
a building. These storms may cause serious injury and significant
property damage.

&&

A tornado watch remains in effect until 700 AM EDT for central,
northern and northwestern New Jersey...and eastern and southeastern
Pennsylvania.

LAT...LON 4060 7472 4058 7471 4051 7478 4051 7480
      4042 7475 4036 7550 4071 7534 4078 7488
      4074 7483 4073 7476 4072 7472 4064 7473
      4062 7471
TIME...MOT...LOC 0702Z 262DEG 39KT 4065 7529 4044 7539 

TORNADO...POSSIBLE
HAIL...0.75IN
WIND...60MPH
 
$$

SFJ

1 follow-up statement

264 
WWUS51 KPHI 150723
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
323 AM EDT MON APR 15 2019

NJC019-041-PAC017-077-091-095-150733-
/O.CAN.KPHI.SV.W.0010.000000T0000Z-190415T0745Z/
Hunterdon NJ-Warren NJ-Montgomery PA-Lehigh PA-Bucks PA-
Northampton PA-
323 AM EDT MON APR 15 2019

...THE SEVERE THUNDERSTORM WARNING FOR HUNTERDON...SOUTHWESTERN
WARREN...NORTH CENTRAL MONTGOMERY...SOUTHEASTERN LEHIGH...
NORTHWESTERN BUCKS AND SOUTHEASTERN NORTHAMPTON COUNTIES IS
CANCELLED...
            
The storms which prompted the warning have weakened below severe
limits, and no longer pose an immediate threat to life or property.
Therefore, the warning has been cancelled.  However gusty winds and
heavy rain are still possible with these thunderstorms.

A tornado watch remains in effect until 700 AM EDT for central,
northern and northwestern New Jersey...and eastern and southeastern
Pennsylvania.

LAT...LON 4060 7472 4058 7471 4051 7478 4051 7480
      4042 7475 4036 7550 4071 7534 4078 7488
      4074 7483 4073 7476 4072 7472 4064 7473
      4062 7471
TIME...MOT...LOC 0722Z 262DEG 39KT 4068 7500 4047 7510 

$$

SFJ

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 15, 12:31 AM EDT	Marine Dense Fog Advisory	PHI		5 hr
Apr 15, 2:34 AM EDT	Special Weather Statement	PHI	Warren	41 min
Apr 15, 2:46 AM EDT	Severe Thunderstorm Warning	PHI	Gloucester, Salem	44 min
Apr 15, 2:47 AM EDT	Special Marine Warning	PHI		58 min
Apr 15, 3:00 AM EDT	Areal Flood Advisory	PHI	Sussex, Warren	4 hr
Apr 15, 3:07 AM EDT	Severe Thunderstorm Warning	PHI	Camden, Cumberland, Gloucester, Salem	38 min
Apr 15, 3:08 AM EDT	Special Marine Warning	PHI		67 min
Apr 15, 3:11 AM EDT	Special Weather Statement	PHI	Hunterdon, Morris, Sussex, Warren	49 min
Apr 15, 3:19 AM EDT	Tornado Warning	PHI	Burlington, Camden, Gloucester, Salem	26 min
Apr 15, 3:19 AM EDT	Wind Advisory	PHI	Atlantic, Burlington, Camden, Cape May, Cumberland, Gloucester and 10 more	18 hr
Apr 15, 3:27 AM EDT	Severe Thunderstorm Warning	PHI	Hunterdon, Mercer, Morris, Somerset	32 min
Apr 15, 3:39 AM EDT	Severe Thunderstorm Warning	PHI	Burlington, Camden, Gloucester, Mercer, Middlesex, Monmouth and 2 more	37 min
Apr 15, 3:41 AM EDT	Severe Thunderstorm Warning	PHI	Atlantic, Burlington, Camden, Cape May, Cumberland, Gloucester and 2 more	64 min
Apr 15, 3:42 AM EDT	Special Marine Warning	PHI		63 min
Apr 15, 3:57 AM EDT	Severe Thunderstorm Warning	PHI	Middlesex, Morris, Somerset	13 min
Apr 15, 3:59 AM EDT	Areal Flood Advisory	PHI	Atlantic, Burlington, Camden, Cape May, Cumberland, Gloucester and 7 more	4 hr
Apr 15, 4:16 AM EDT	Special Marine Warning	PHI		59 min
Apr 15, 4:40 AM EDT	Special Marine Warning	PHI		65 min
Apr 15, 4:47 AM EDT	Special Weather Statement	PHI	Atlantic	28 min
Apr 15, 5:07 AM EDT	Special Marine Warning	PHI		53 min
Apr 15, 5:30 AM EDT	Coastal Flood Statement	PHI	Ocean	7 hr
Apr 15, 6:59 AM EDT	Areal Flood Warning	PHI	Hunterdon	4 hr
Apr 14, 9:19 PM EDT	Areal Flood Advisory	PHI	Berks	3 hr
Apr 15, 12:03 AM EDT	Special Weather Statement	PHI	Monroe	27 min
Apr 15, 1:10 AM EDT	Special Weather Statement	PHI	Schuylkill	50 min
Apr 15, 1:26 AM EDT	Areal Flood Advisory	PHI	Carbon, Monroe	4 hr
Apr 15, 1:28 AM EDT	Severe Thunderstorm Warning	PHI	Carbon, Monroe	47 min
Apr 15, 1:43 AM EDT	Areal Flood Advisory	PHI	Berks	4 hr
Apr 15, 1:58 AM EDT	Special Weather Statement	PHI	Berks, Carbon, Monroe	47 min
Apr 15, 2:21 AM EDT	Areal Flood Advisory	PHI	Lehigh, Northampton	4 hr
Apr 15, 2:28 AM EDT	Special Weather Statement	PHI	Chester	32 min

Nearby

Severe Thunderstorm Warnings in Pennsylvania, 2019 Severe Thunderstorm Warnings in New Jersey, 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.