Alert archive / Pennsylvania / Severe Thunderstorm Watches in 2011

Severe Thunderstorm Watch 410

June 1, 20114 states

The Storm Prediction Center issued this severe thunderstorm watch at Jun 1, 2011, 10:02 AM EDT for 4 states. It was in force for 7 hr.

The area

The outline as issued.

The facts

Issued: Jun 1, 2011, 10:02 AM EDT (14:02 UTC)
Expired: Jun 1, 2011, 5:00 PM EDT
In force: 7 hr
Issued by: the Storm Prediction Center
Largest hail expected: 2 in
Strongest gust expected: 60 kt

All 84 counties

Coos County, NH, Grafton County, NH, Sullivan County, NH, Albany County, NY, Broome County, NY, Chemung County, NY, Chenango County, NY, Clinton County, NY, Columbia County, NY, Cortland County, NY, Delaware County, NY, Dutchess County, NY, Essex County, NY, Fulton County, NY, Greene County, NY, Hamilton County, NY, Herkimer County, NY, Madison County, NY, Montgomery County, NY, Oneida County, NY, Otsego County, NY, Rensselaer County, NY, Saratoga County, NY, Schenectady County, NY, Schoharie County, NY, Schuyler County, NY, Sullivan County, NY, Tioga County, NY, Tompkins County, NY, Ulster County, NY, Warren County, NY, Washington County, NY, Adams County, PA, Bedford County, PA, Blair County, PA, Bradford County, PA, Cambria County, PA, Cameron County, PA, Centre County, PA, Clearfield County, PA, Clinton County, PA, Columbia County, PA, Cumberland County, PA, Dauphin County, PA, Elk County, PA, Franklin County, PA, Fulton County, PA, Huntingdon County, PA, Juniata County, PA, Lackawanna County, PA, Lancaster County, PA, Lebanon County, PA, Luzerne County, PA, Lycoming County, PA, Mifflin County, PA, Montour County, PA, Northumberland County, PA, Perry County, PA, Pike County, PA, Potter County, PA, Schuylkill County, PA, Snyder County, PA, Somerset County, PA, Sullivan County, PA, Susquehanna County, PA, Tioga County, PA, Union County, PA, Wayne County, PA, Wyoming County, PA, York County, PA, Addison County, VT, Bennington County, VT, Caledonia County, VT, Chittenden County, VT, Essex County, VT, Franklin County, VT, Grand Isle County, VT, Lamoille County, VT, Orange County, VT, Orleans County, VT, Rutland County, VT, Washington County, VT, Windham County, VT, Windsor County, VT

The radar

The Binghamton radar (KBGM), 52 km from the middle of the area, began a volume at 14:03 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: 5%
Ten or more severe wind reports: 50%
One or more gusts of 65 knots or more: 30%
Ten or more severe hail reports: 40%
One or more hailstones of 2 inches or more: 20%
Six or more combined severe hail and wind reports: 80%

Warnings issued inside it

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

Issued	Product	Office	Counties	Lasted
Jun 1, 10:23 AM EDT	Severe Thunderstorm Warning	CTP	McKean, Potter	52 min
Jun 1, 11:36 AM EDT	Severe Thunderstorm Warning	ALY	Fulton, Hamilton, Herkimer, Montgomery, Saratoga, Schenectady	54 min
Jun 1, 11:48 AM EDT	Severe Thunderstorm Warning	CTP	Columbia, Lycoming, Sullivan	57 min
Jun 1, 12:30 PM EDT	Severe Thunderstorm Warning	ALY	Fulton, Montgomery, Rensselaer, Saratoga, Schenectady, Washington	60 min
Jun 1, 12:30 PM EDT	Severe Thunderstorm Warning	BGM	Lackawanna, Luzerne, Wyoming	45 min
Jun 1, 12:42 PM EDT	Severe Thunderstorm Warning	BGM	Luzerne	63 min
Jun 1, 12:48 PM EDT	Severe Thunderstorm Warning	ALY	Washington	57 min
Jun 1, 1:11 PM EDT	Severe Thunderstorm Warning	ALY	Fulton, Montgomery, Saratoga, Schenectady, Warren, Washington	64 min
Jun 1, 1:13 PM EDT	Severe Thunderstorm Warning	BTV	Rutland, Windsor	62 min
Jun 1, 1:28 PM EDT	Severe Thunderstorm Warning	ALY	Rensselaer, Washington	62 min
Jun 1, 1:41 PM EDT	Severe Thunderstorm Warning	BGM	Sullivan	34 min
Jun 1, 1:42 PM EDT	Severe Thunderstorm Warning	CTP	Cumberland, Dauphin, Lancaster, Lebanon, Perry	63 min
Jun 1, 1:56 PM EDT	Severe Thunderstorm Warning	ALY	Ulster	64 min
Jun 1, 2:12 PM EDT	Severe Thunderstorm Warning	GYX	Belknap, Carroll, Grafton	48 min
Jun 1, 2:13 PM EDT	Severe Thunderstorm Warning	ALY	Fulton, Montgomery, Rensselaer, Saratoga, Schenectady, Washington	77 min
Jun 1, 2:17 PM EDT	Severe Thunderstorm Warning	GYX	Coos	43 min
Jun 1, 2:21 PM EDT	Severe Thunderstorm Warning	CTP	Lebanon, Schuylkill	54 min
Jun 1, 2:28 PM EDT	Severe Thunderstorm Warning	ALY	Columbia, Rensselaer	62 min
Jun 1, 2:28 PM EDT	Severe Thunderstorm Warning	ALY	Windham	47 min
Jun 1, 2:32 PM EDT	Severe Thunderstorm Warning	CTP	Adams, Franklin, Fulton	32 min
Jun 1, 2:47 PM EDT	Tornado Warning	GYX	Coos	28 min
Jun 1, 2:57 PM EDT	Severe Thunderstorm Warning	GYX	Coos	33 min
Jun 1, 2:57 PM EDT	Severe Thunderstorm Warning	GYX	Belknap, Carroll, Grafton	33 min
Jun 1, 3:09 PM EDT	Severe Thunderstorm Warning	ALY	Bennington, Windham	66 min
Jun 1, 3:22 PM EDT	Severe Thunderstorm Warning	BGM	Sullivan	53 min
Jun 1, 3:41 PM EDT	Severe Thunderstorm Warning	CTP	Lancaster, York	34 min
Jun 1, 3:56 PM EDT	Severe Thunderstorm Warning	ALY	Bennington, Windham	48 min
Jun 1, 4:15 PM EDT	Severe Thunderstorm Warning	BGM	Sullivan	24 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

Albany, NY (KALY), launched 12:00Z, 2.0 hours before the alert went out and 141 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: 2410 J/kg
Mixed-layer CIN: -130 J/kg
Mixed-layer LCL: 836 m above ground
0-6 km bulk shear: 34 kt
0-1 km storm-relative helicity: 159 m²/s²
0-3 km storm-relative helicity: 189 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 3.5

Open this sounding in Storm Lab

SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jun 1, 12:26 PM EDT	Mesoscale Discussion	SPC	Oxford	64 min
Jun 1, 12:58 PM EDT	Tornado Watch	SPC	Androscoggin, Cumberland, Oxford, Sagadahoc, York	7 hr
Jun 1, 2:19 PM EDT	Mesoscale Discussion	SPC	Aroostook, Franklin, Kennebec, Penobscot, Piscataquis, Somerset and 1 more	86 min
Jun 1, 2:37 PM EDT	Tornado Watch	SPC	Aroostook, Franklin, Kennebec, Knox, Lincoln, Penobscot and 3 more	5 hr
Jun 1, 4:17 PM EDT	Mesoscale Discussion	SPC	Androscoggin, Cumberland, Franklin, Kennebec, Oxford, Piscataquis and 3 more	88 min
Jun 1, 7:09 PM EDT	Mesoscale Discussion	SPC	Androscoggin, Cumberland, Franklin, Hancock, Kennebec, Knox and 9 more	96 min
Jun 1, 7:40 PM EDT	Tornado Watch	SPC	Androscoggin, Cumberland, Franklin, Kennebec, Oxford, Penobscot and 5 more	2 hr
Jun 1, 5:58 AM EDT	Mesoscale Discussion	SPC	Albany, Broome, Chenango, Columbia, Delaware, Essex and 12 more	2 hr
Jun 1, 9:38 AM EDT	Mesoscale Discussion	SPC	Allegany, Broome, Cayuga, Chemung, Chenango, Clinton and 21 more	37 min

Nearby

Severe Thunderstorm Watches in Pennsylvania, 2011 Severe Thunderstorm Watches in New York, 2011 Severe Thunderstorm Watches in Vermont, 2011 Every severe thunderstorm watch in 2011

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.