Alert archive / New York / Mesoscale Discussions in 2017

Mesoscale Discussion 169

February 12, 20175 states

The Storm Prediction Center issued this mesoscale discussion at Feb 12, 2017, 9:59 AM EST for 5 states. It was in force for 5 hr.

The area

The outline as issued.

The facts

Issued: Feb 12, 2017, 9:59 AM EST (14:59 UTC)
Expired: Feb 12, 2017, 3:00 PM EST
In force: 5 hr
Issued by: the Storm Prediction Center

All 38 counties

Berkshire County, MA, Bristol 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, Cheshire County, NH, Hillsborough County, NH, Merrimack County, NH, Sullivan County, NH, Albany County, NY, Columbia County, NY, Essex County, NY, Franklin County, NY, Fulton County, NY, Hamilton County, NY, Herkimer County, NY, Lewis County, NY, Montgomery County, NY, Rensselaer County, NY, Saratoga County, NY, Schenectady County, NY, St. Lawrence County, NY, Warren County, NY, Washington County, NY, Bristol County, RI, Kent County, RI, Providence County, RI, Addison County, VT, Bennington County, VT, Orange County, VT, Rutland County, VT, Windham County, VT, Windsor County, VT

The radar

The Albany radar (KENX), 92 km from the middle of the area, began a volume at 14:59 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 nearest sounding before it

Albany, NY (KALY), launched 12:00Z, 3.0 hours before the alert went out and 69 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 911 m above ground
0-6 km bulk shear: 61 kt
0-1 km storm-relative helicity: 80 m²/s²
0-3 km storm-relative helicity: 146 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

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SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Feb 12, 10:36 AM EST	Mesoscale Discussion	SPC		24 min
Feb 12, 12:02 PM EST	Mesoscale Discussion	SPC		4 hr
Feb 12, 2:51 PM EST	Mesoscale Discussion	SPC	Essex, Middlesex	4 hr

Nearby

Mesoscale Discussions in New York, 2017 Mesoscale Discussions in Massachusetts, 2017 Mesoscale Discussions in Vermont, 2017 Every mesoscale discussion 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.