Alert archive / New York / Mesoscale Discussions in 2014

Mesoscale Discussion 1687

September 6, 20148 states

The Storm Prediction Center issued this mesoscale discussion at Sep 6, 2014, 12:31 PM EDT for 8 states. It was in force for 89 min.

The area

The outline as issued.

The facts

Issued: Sep 6, 2014, 12:31 PM EDT (16:31 UTC)
Expired: Sep 6, 2014, 2:00 PM EDT
In force: 89 min
Issued by: the Storm Prediction Center
Chance of a watch: 80%

All 111 counties

Berkshire County, MA, Essex County, MA, Franklin County, MA, Hampden County, MA, Hampshire County, MA, Middlesex County, MA, Norfolk County, MA, Suffolk County, MA, Worcester County, MA, Androscoggin County, ME, Cumberland County, ME, Franklin County, ME, Hancock County, ME, Kennebec County, ME, Knox County, ME, Lincoln County, ME, Oxford County, ME, Penobscot County, ME, Piscataquis County, ME, Sagadahoc County, ME, Somerset County, ME, Waldo County, ME, Washington County, ME, York County, ME, Belknap County, NH, Carroll County, NH, Cheshire County, NH, Coos County, NH, Grafton County, NH, Hillsborough County, NH, Merrimack County, NH, Rockingham County, NH, Strafford County, NH, Sullivan County, NH, Bergen County, NJ, Essex County, NJ, Hudson County, NJ, Hunterdon County, NJ, Mercer County, NJ, Middlesex County, NJ, Monmouth County, NJ, Morris County, NJ, Passaic County, NJ, Somerset County, NJ, Sussex County, NJ, Union County, NJ, Warren County, NJ, Albany County, NY, Bronx County, NY, Broome County, NY, Chenango 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, Tioga County, NY, Ulster County, NY, Warren County, NY, Washington County, NY, Westchester County, NY, Berks County, PA, Bradford County, PA, Bucks County, PA, Carbon County, PA, Columbia County, PA, Lackawanna County, PA, Lehigh County, PA, Luzerne County, PA, Lycoming County, PA, Monroe County, PA, Montgomery County, PA, Montour County, PA, Northampton County, PA, Northumberland County, PA, Pike County, PA, Schuylkill County, PA, Snyder County, PA, Sullivan County, PA, Susquehanna County, PA, Union County, PA, Wayne County, PA, Wyoming County, PA, Bristol County, RI, Kent County, RI, Providence County, RI, Addison County, VT, Bennington County, VT, Caledonia County, VT, Essex County, VT, Orange County, VT, Rutland County, VT, Washington County, VT, Windham County, VT, Windsor County, VT

The radar

The Albany radar (KENX), 135 km from the middle of the area, began a volume at 16:31 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 watches that followed

Watches SPC issued over any of the same counties within four hours of this discussion.

The nearest sounding before it

Albany, NY (KALY), launched 12:00Z, 4.5 hours before the alert went out and 114 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: 685 J/kg
Mixed-layer CIN: -40 J/kg
Mixed-layer LCL: 619 m above ground
0-6 km bulk shear: 42 kt
0-1 km storm-relative helicity: 34 m²/s²
0-3 km storm-relative helicity: 81 m²/s²
Significant tornado parameter: 0.2
Supercell composite: 1.4

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

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SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Sep 6, 1:22 PM EDT	Severe Thunderstorm Watch	SPC	Greater Bridgeport Planning Region, Capitol Planning Region, Northwest Hills Planning Region, Lower Connecticut River Valley Planning Region, Naugatuck Valley Planning Region, Southeastern Connecticut Planning Region and 1 more	8 hr
Sep 6, 4:20 PM EDT	Mesoscale Discussion	SPC		85 min
Sep 6, 7:31 PM EDT	Mesoscale Discussion	SPC		89 min
Sep 6, 2:07 PM EDT	Severe Thunderstorm Watch	SPC	Atlantic, Burlington, Camden, Cape May, Cumberland, Gloucester and 10 more	7 hr
Sep 6, 6:58 PM EDT	Mesoscale Discussion	SPC	Atlantic, Burlington, Camden, Cape May, Cumberland, Gloucester and 10 more	92 min

Nearby

Mesoscale Discussions in New York, 2014 Mesoscale Discussions in Pennsylvania, 2014 Mesoscale Discussions in Maine, 2014 Every mesoscale discussion in 2014

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.