Alert archive / New York / Mesoscale Discussions in 2013

Mesoscale Discussion 779

May 23, 20136 states

The Storm Prediction Center issued this mesoscale discussion at May 23, 2013, 11:23 AM EDT for 6 states. It was in force for 3 hr.

The area

The outline as issued.

The facts

Issued: May 23, 2013, 11:23 AM EDT (15:23 UTC)
Expired: May 23, 2013, 2:00 PM EDT
In force: 3 hr
Issued by: the Storm Prediction Center
Chance of a watch: 60%

All 33 counties

Berkshire County, MA, Franklin County, MA, Hampden County, MA, Hampshire County, MA, Cheshire County, NH, Bergen County, NJ, Essex County, NJ, Hudson County, NJ, Hunterdon County, NJ, Mercer County, NJ, Middlesex 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, Columbia County, NY, Dutchess County, NY, Greene County, NY, New York County, NY, Orange County, NY, Putnam County, NY, Rensselaer County, NY, Richmond County, NY, Rockland County, NY, Ulster County, NY, Westchester County, NY, Bucks County, PA, Bennington County, VT, Windham County, VT

The radar

The Albany radar (KENX), 100 km from the middle of the area, began a volume at 15:24 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, 3.4 hours before the alert went out and 107 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: 24 J/kg
Mixed-layer CIN: -184 J/kg
Mixed-layer LCL: 1246 m above ground
0-6 km bulk shear: 38 kt
0-1 km storm-relative helicity: 142 m²/s²
0-3 km storm-relative helicity: 148 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

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
May 22, 8:21 PM EDT	Mesoscale Discussion	SPC		54 min
May 23, 10:57 AM EDT	Mesoscale Discussion	SPC	Allegany, Broome, Cayuga, Chemung, Chenango, Cortland and 15 more	3 hr
May 23, 11:50 AM EDT	Mesoscale Discussion	SPC	Allegheny, Armstrong, Beaver, Blair, Butler, Cambria and 6 more	115 min
May 23, 3:37 PM EDT	Mesoscale Discussion	SPC	Adams, Berks, Chester, Cumberland, Dauphin, Franklin and 5 more	53 min

Nearby

Mesoscale Discussions in New York, 2013 Mesoscale Discussions in New Jersey, 2013 Mesoscale Discussions in Connecticut, 2013 Every mesoscale discussion in 2013

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.