Alert archive / Pennsylvania / Severe Thunderstorm Watches in 2017

Severe Thunderstorm Watch 354

June 19, 20176 states

The Storm Prediction Center issued this severe thunderstorm watch at Jun 19, 2017, 11:13 AM EDT for 6 states. It was in force for 9 hr.

The area

The outline as issued.

The facts

Issued: Jun 19, 2017, 11:13 AM EDT (15:13 UTC)
Expired: Jun 19, 2017, 8:00 PM EDT
In force: 9 hr
Issued by: the Storm Prediction Center
Largest hail expected: 1.5 in
Strongest gust expected: 60 kt

All 91 counties

Capitol Planning Region, CT, Greater Bridgeport Planning Region, CT, Lower Connecticut River Valley Planning Region, CT, Naugatuck Valley Planning Region, CT, Northeastern Connecticut Planning Region, CT, Northwest Hills Planning Region, CT, Southeastern Connecticut Planning Region, CT, Berkshire County, MA, Franklin County, MA, Hampden County, MA, Hampshire County, MA, Middlesex County, MA, Worcester County, MA, Atlantic County, NJ, Bergen County, NJ, Burlington County, NJ, Camden County, NJ, Cape May County, NJ, Cumberland County, NJ, Essex County, NJ, Gloucester County, NJ, Hudson County, NJ, Hunterdon County, NJ, Mercer County, NJ, Middlesex County, NJ, Monmouth County, NJ, Morris County, NJ, Ocean County, NJ, Passaic County, NJ, Salem County, NJ, Somerset County, NJ, Sussex County, NJ, Union County, NJ, Warren County, NJ, Albany County, NY, Bronx County, NY, Columbia County, NY, Delaware County, NY, Dutchess County, NY, Fulton County, NY, Greene County, NY, Kings County, NY, Montgomery County, NY, Nassau County, NY, New York County, NY, Orange County, NY, Otsego County, NY, Putnam County, NY, Queens County, NY, Rensselaer County, NY, Richmond County, NY, Rockland County, NY, Saratoga County, NY, Schenectady County, NY, Schoharie County, NY, Suffolk County, NY, Sullivan County, NY, Ulster County, NY, Warren County, NY, Washington County, NY, Westchester County, NY, Adams County, PA, Berks County, PA, Bucks County, PA, Carbon County, PA, Chester County, PA, Columbia County, PA, Cumberland County, PA, Dauphin County, PA, Delaware County, PA, Franklin County, PA, Lackawanna County, PA, Lancaster County, PA, Lebanon County, PA, Lehigh County, PA, Luzerne County, PA, Monroe County, PA, Montgomery County, PA, Montour County, PA, Northampton County, PA, Northumberland County, PA, Perry County, PA, Philadelphia County, PA, Pike County, PA, Schuylkill County, PA, Susquehanna County, PA, Wayne County, PA, Wyoming County, PA, York County, PA, Bennington County, VT, Windham County, VT

The radar

The Binghamton radar (KBGM), 136 km from the middle of the area, began a volume at 15:16 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 SPC expected

The probabilities SPC published with the watch, for the watch area over its life.

Two or more tornadoes: 20%
One or more EF2 to EF5 tornadoes: 2%
Ten or more severe wind reports: 70%
One or more gusts of 65 knots or more: 10%
Ten or more severe hail reports: 50%
One or more hailstones of 2 inches or more: 10%
Six or more combined severe hail and wind reports: 90%

Warnings issued inside it

58 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.

Issued	Product	Office	Counties	Lasted
Jun 19, 12:13 PM EDT	Severe Thunderstorm Warning	OKX	Orange, Putnam, Rockland, Westchester	62 min
Jun 19, 12:19 PM EDT	Severe Thunderstorm Warning	CTP	Columbia, Dauphin, Lebanon, Montour, Northumberland, Schuylkill	56 min
Jun 19, 12:27 PM EDT	Severe Thunderstorm Warning	ALY	Northwest Hills Planning Region	63 min
Jun 19, 12:40 PM EDT	Severe Thunderstorm Warning	BGM	Bradford, Susquehanna	65 min
Jun 19, 12:40 PM EDT	Severe Thunderstorm Warning	CTP	Adams, Cumberland, Franklin, York	65 min
Jun 19, 12:43 PM EDT	Severe Thunderstorm Warning	ALY	Rensselaer, Saratoga, Washington	62 min
Jun 19, 12:53 PM EDT	Severe Thunderstorm Warning	ALY	Albany, Rensselaer	67 min
Jun 19, 12:55 PM EDT	Severe Thunderstorm Warning	PHI	Carbon, Monroe	50 min
Jun 19, 1:02 PM EDT	Severe Thunderstorm Warning	ALY	Dutchess, Ulster	58 min
Jun 19, 1:12 PM EDT	Severe Thunderstorm Warning	ALY	Saratoga, Washington	63 min
Jun 19, 1:22 PM EDT	Severe Thunderstorm Warning	ALY	Berkshire	53 min
Jun 19, 1:27 PM EDT	Tornado Warning	CTP	Cumberland, Dauphin, Lancaster, Lebanon, Schuylkill, York	48 min
Jun 19, 1:43 PM EDT	Severe Thunderstorm Warning	BOX	Franklin	52 min
Jun 19, 1:49 PM EDT	Severe Thunderstorm Warning	CTP	Dauphin, Lancaster, Lebanon, Schuylkill, York	56 min
Jun 19, 2:04 PM EDT	Severe Thunderstorm Warning	BGM	Delaware, Sullivan	26 min
Jun 19, 2:08 PM EDT	Severe Thunderstorm Warning	PHI	Berks	52 min
Jun 19, 2:10 PM EDT	Flash Flood Warning	ALY	Windham	5 hr
Jun 19, 2:24 PM EDT	Severe Thunderstorm Warning	CTP	Schuylkill	44 min
Jun 19, 2:28 PM EDT	Severe Thunderstorm Warning	ALY	Berkshire	62 min
Jun 19, 2:35 PM EDT	Severe Thunderstorm Warning	OKX	Orange	55 min
Jun 19, 2:45 PM EDT	Severe Thunderstorm Warning	CTP	Lancaster	30 min
Jun 19, 2:46 PM EDT	Severe Thunderstorm Warning	ALY	Windham	44 min
Jun 19, 2:49 PM EDT	Severe Thunderstorm Warning	PHI	Berks, Lehigh, Montgomery, Northampton	41 min
Jun 19, 2:53 PM EDT	Severe Thunderstorm Warning	PHI	Carbon, Monroe	52 min
Jun 19, 2:57 PM EDT	Severe Thunderstorm Warning	PHI	Sussex, Warren	48 min
Jun 19, 3:03 PM EDT	Flash Flood Warning	OKX	Orange	3 hr
Jun 19, 3:08 PM EDT	Severe Thunderstorm Warning	PHI	Berks, Chester, Montgomery	52 min
Jun 19, 3:17 PM EDT	Flash Flood Warning	PHI	Sussex, Warren	3 hr
Jun 19, 3:19 PM EDT	Severe Thunderstorm Warning	ALY	Dutchess, Ulster	56 min
Jun 19, 3:23 PM EDT	Severe Thunderstorm Warning	OKX	Putnam	19 min
Jun 19, 3:24 PM EDT	Flash Flood Warning	PHI	Carbon, Lehigh, Monroe, Northampton	3 hr
Jun 19, 3:29 PM EDT	Severe Thunderstorm Warning	ALY	Northwest Hills Planning Region	61 min
Jun 19, 3:35 PM EDT	Severe Thunderstorm Warning	PHI	Warren	25 min
Jun 19, 3:53 PM EDT	Severe Thunderstorm Warning	PHI	Morris, Sussex, Warren	37 min
Jun 19, 3:56 PM EDT	Severe Thunderstorm Warning	PHI	Hunterdon, Morris, Somerset, Warren	49 min
Jun 19, 4:03 PM EDT	Severe Thunderstorm Warning	ALY	Northwest Hills Planning Region	57 min
Jun 19, 4:05 PM EDT	Severe Thunderstorm Warning	ALY	Rensselaer	55 min
Jun 19, 4:07 PM EDT	Severe Thunderstorm Warning	PHI	Gloucester, Salem	38 min
Jun 19, 4:07 PM EDT	Severe Thunderstorm Warning	PHI	Chester, Delaware, Montgomery	38 min
Jun 19, 4:22 PM EDT	Severe Thunderstorm Warning	OKX	Greater Bridgeport Planning Region	38 min
Jun 19, 4:29 PM EDT	Severe Thunderstorm Warning	BOX	Capitol Planning Region	61 min
Jun 19, 4:31 PM EDT	Severe Thunderstorm Warning	ALY	Northwest Hills Planning Region	59 min
Jun 19, 4:31 PM EDT	Severe Thunderstorm Warning	OKX	Passaic	33 min
Jun 19, 4:34 PM EDT	Severe Thunderstorm Warning	PHI	Camden, Gloucester, Mercer, Salem	41 min
Jun 19, 4:35 PM EDT	Severe Thunderstorm Warning	OKX	Bergen, Essex, Hudson, Union	55 min
Jun 19, 4:53 PM EDT	Flash Flood Warning	OKX	Bergen, Essex, Hudson, Passaic, Union	3 hr
Jun 19, 4:59 PM EDT	Severe Thunderstorm Warning	ALY	Windham	30 min
Jun 19, 5:01 PM EDT	Severe Thunderstorm Warning	OKX	Bergen, Essex, Hudson, Passaic, Union	44 min
Jun 19, 5:05 PM EDT	Flash Flood Warning	OKX	Bronx, Kings, New York, Queens, Richmond	3 hr
Jun 19, 5:09 PM EDT	Severe Thunderstorm Warning	PHI	Burlington, Camden, Gloucester, Mercer, Middlesex, Monmouth and 2 more	51 min
Jun 19, 5:15 PM EDT	Severe Thunderstorm Warning	PHI	Burlington, Camden, Cumberland, Gloucester, Salem	45 min
Jun 19, 5:25 PM EDT	Severe Thunderstorm Warning	OKX	Hudson	50 min
Jun 19, 5:28 PM EDT	Severe Thunderstorm Warning	PHI	Cumberland	62 min
Jun 19, 5:32 PM EDT	Severe Thunderstorm Warning	ALY	Northwest Hills Planning Region	28 min
Jun 19, 5:34 PM EDT	Severe Thunderstorm Warning	OKX	Greater Bridgeport Planning Region, Naugatuck Valley Planning Region	56 min
Jun 19, 5:36 PM EDT	Severe Thunderstorm Warning	BOX	Capitol Planning Region	37 min
Jun 19, 6:47 PM EDT	Severe Thunderstorm Warning	PHI	Atlantic, Cape May, Cumberland	43 min
Jun 19, 7:20 PM EDT	Severe Thunderstorm Warning	PHI	Atlantic, Ocean	25 min

Discussions around it

SPC mesoscale discussions over the same counties from four hours before the watch to its end.

The nearest sounding before it

Brookhaven, NY (KOKX), launched 12:00Z, 3.2 hours before the alert went out and 193 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: 1007 J/kg
Mixed-layer CIN: -84 J/kg
Mixed-layer LCL: 659 m above ground
0-6 km bulk shear: 27 kt
0-1 km storm-relative helicity: 193 m²/s²
0-3 km storm-relative helicity: 184 m²/s²
Significant tornado parameter: 0.2
Supercell composite: 2.2

Open this sounding in Storm Lab

SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jun 19, 10:45 AM EDT	Mesoscale Discussion	SPC		3 hr
Jun 19, 2:58 PM EDT	Mesoscale Discussion	SPC		2 hr
Jun 19, 12:24 PM EDT	Severe Thunderstorm Watch	SPC	Belknap, Carroll, Cheshire, Coos, Grafton, Hillsborough and 4 more	8 hr
Jun 19, 2:21 PM EDT	Mesoscale Discussion	SPC	Bergen, Camden, Essex, Gloucester, Hudson, Hunterdon and 7 more	114 min

Nearby

Severe Thunderstorm Watches in Pennsylvania, 2017 Severe Thunderstorm Watches in New York, 2017 Severe Thunderstorm Watches in New Jersey, 2017 Every severe thunderstorm watch in 2017

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.