Alert archive / New York / Severe Thunderstorm Watches in 2017

Severe Thunderstorm Watch 385

June 30, 20176 states

The Storm Prediction Center issued this severe thunderstorm watch at Jun 30, 2017, 1:41 PM EDT for 6 states. It was in force for 7 hr.

The area

The outline as issued.

The facts

Issued: Jun 30, 2017, 1:41 PM EDT (17:41 UTC)
Expired: Jun 30, 2017, 8:12 PM EDT
In force: 7 hr
Issued by: the Storm Prediction Center
Largest hail expected: 1.5 in
Strongest gust expected: 60 kt

All 47 counties

Capitol Planning Region, CT, Northeastern Connecticut Planning Region, CT, Northwest Hills Planning Region, CT, Berkshire County, MA, Franklin County, MA, Hampden County, MA, Hampshire County, MA, Worcester County, MA, Belknap County, NH, Cheshire County, NH, Grafton County, NH, Hillsborough County, NH, Merrimack County, NH, Sullivan County, NH, Albany County, NY, Broome County, NY, Chenango County, NY, Columbia County, NY, Delaware County, NY, Dutchess 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, Sullivan County, NY, Ulster County, NY, Warren County, NY, Washington County, NY, Lackawanna County, PA, Luzerne County, PA, Pike County, PA, Susquehanna County, PA, Wayne County, PA, Wyoming County, PA, Bennington County, VT, Orange County, VT, Rutland County, VT, Windham County, VT, Windsor County, VT

The radar

The Albany radar (KENX), 11 km from the middle of the area, began a volume at 17:45 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 SPC expected

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

Two or more tornadoes: 10%
One or more EF2 to EF5 tornadoes: 2%
Ten or more severe wind reports: 50%
One or more gusts of 65 knots or more: 10%
Ten or more severe hail reports: 40%
One or more hailstones of 2 inches or more: 10%
Six or more combined severe hail and wind reports: 70%

Warnings issued inside it

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

Issued	Product	Office	Counties	Lasted
Jun 30, 2:26 PM EDT	Severe Thunderstorm Warning	BGM	Broome, Chenango, Delaware	34 min
Jun 30, 3:00 PM EDT	Severe Thunderstorm Warning	BGM	Lackawanna, Wyoming	45 min
Jun 30, 3:31 PM EDT	Severe Thunderstorm Warning	ALY	Saratoga, Washington	44 min
Jun 30, 3:41 PM EDT	Severe Thunderstorm Warning	ALY	Fulton, Saratoga	49 min
Jun 30, 3:52 PM EDT	Severe Thunderstorm Warning	BGM	Lackawanna, Luzerne, Wyoming	53 min
Jun 30, 4:34 PM EDT	Severe Thunderstorm Warning	ALY	Berkshire	41 min
Jun 30, 4:43 PM EDT	Severe Thunderstorm Warning	ALY	Dutchess, Ulster	47 min
Jun 30, 4:45 PM EDT	Tornado Warning	BGM	Oneida	30 min
Jun 30, 4:57 PM EDT	Severe Thunderstorm Warning	ALY	Northwest Hills Planning Region	48 min
Jun 30, 4:59 PM EDT	Severe Thunderstorm Warning	BOX	Franklin, Hampshire	46 min
Jun 30, 5:03 PM EDT	Severe Thunderstorm Warning	BGM	Oneida	27 min
Jun 30, 5:06 PM EDT	Severe Thunderstorm Warning	BTV	Addison, Rutland, Windsor	39 min
Jun 30, 5:23 PM EDT	Severe Thunderstorm Warning	ALY	Northwest Hills Planning Region	37 min
Jun 30, 5:31 PM EDT	Severe Thunderstorm Warning	BOX	Capitol Planning Region	44 min
Jun 30, 5:43 PM EDT	Severe Thunderstorm Warning	BGM	Delaware	47 min
Jun 30, 5:54 PM EDT	Tornado Warning	BGM	Delaware	51 min
Jun 30, 6:06 PM EDT	Severe Thunderstorm Warning	BOX	Capitol Planning Region	24 min
Jun 30, 6:41 PM EDT	Tornado Warning	BGM	Delaware	23 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, 5.7 hours before the alert went out and 32 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: 26 J/kg
Mixed-layer CIN: -117 J/kg
Mixed-layer LCL: 1165 m above ground
0-6 km bulk shear: 33 kt
0-1 km storm-relative helicity: 156 m²/s²
0-3 km storm-relative helicity: 193 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jun 30, 4:20 PM EDT	Mesoscale Discussion	SPC		115 min
Jun 30, 7:06 PM EDT	Mesoscale Discussion	SPC		54 min
Jun 30, 12:48 PM EDT	Mesoscale Discussion	SPC	Berkshire, Franklin	2 hr

Nearby

Severe Thunderstorm Watches in New York, 2017 Severe Thunderstorm Watches in New Hampshire, 2017 Severe Thunderstorm Watches in Pennsylvania, 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.