Alert archive / New York / Mesoscale Discussions in 2017

Mesoscale Discussion 170

February 12, 20175 counties in New Jersey; 19 counties in New York

The Storm Prediction Center issued this mesoscale discussion at Feb 12, 2017, 10:36 AM EST for 5 counties in New Jersey; 19 counties in New York. It was in force for 24 min.

The area

The outline as issued.

The facts

Issued: Feb 12, 2017, 10:36 AM EST (15:36 UTC)
Expired: Feb 12, 2017, 11:00 AM EST
In force: 24 min
Issued by: the Storm Prediction Center

All 24 counties

Bergen County, NJ, Essex County, NJ, Hudson County, NJ, Passaic County, NJ, Sussex County, NJ, Bronx County, NY, Cayuga County, NY, Chenango County, NY, Cortland County, NY, Delaware County, NY, Dutchess County, NY, Madison County, NY, Nassau County, NY, New York County, NY, Onondaga County, NY, Orange County, NY, Otsego County, NY, Putnam County, NY, Rockland County, NY, Seneca County, NY, Sullivan County, NY, Ulster County, NY, Wayne County, NY, Westchester County, NY

The radar

The Binghamton radar (KBGM), 54 km from the middle of the area, began a volume at 15:37 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, 3.6 hours before the alert went out and 132 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, 9:59 AM EST	Mesoscale Discussion	SPC		5 hr
Feb 12, 12:02 PM EST	Mesoscale Discussion	SPC		4 hr
Feb 12, 2:51 PM EST	Mesoscale Discussion	SPC	Clinton, Essex	4 hr

Nearby

Mesoscale Discussions in New York, 2017 Mesoscale Discussions in New Jersey, 2017 Mesoscale Discussions in Connecticut, 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.