Alert archive / New York / Mesoscale Discussions in 2018

Mesoscale Discussion 722

June 13, 201834 counties in New York; 6 counties in Pennsylvania

The Storm Prediction Center issued this mesoscale discussion at Jun 13, 2018, 3:30 PM EDT for 34 counties in New York; 6 counties in Pennsylvania. It was in force for 60 min.

The area

The outline as issued.

The facts

Issued: Jun 13, 2018, 3:30 PM EDT (19:30 UTC)
Expired: Jun 13, 2018, 4:30 PM EDT
In force: 60 min
Issued by: the Storm Prediction Center
Chance of a watch: 95%

All 40 counties

Allegany County, NY, Cattaraugus County, NY, Cayuga County, NY, Chautauqua County, NY, Chemung County, NY, Chenango County, NY, Clinton County, NY, Cortland County, NY, Erie County, NY, Essex County, NY, Franklin County, NY, Genesee County, NY, Hamilton County, NY, Herkimer County, NY, Jefferson County, NY, Lewis County, NY, Livingston County, NY, Madison County, NY, Monroe County, NY, Niagara County, NY, Oneida County, NY, Onondaga County, NY, Ontario County, NY, Orleans County, NY, Oswego County, NY, Schuyler County, NY, Seneca County, NY, St. Lawrence County, NY, Steuben County, NY, Tioga County, NY, Tompkins County, NY, Wayne County, NY, Wyoming County, NY, Yates County, NY, Elk County, PA, Forest County, PA, McKean County, PA, Potter County, PA, Tioga County, PA, Warren County, PA

The radar

The Binghamton radar (KBGM), 112 km from the middle of the area, began a volume at 19:33 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

Buffalo Intl Airport, NY (KBUF), launched 12:00Z, 7.5 hours before the alert went out and 141 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: 173 J/kg
Mixed-layer CIN: -23 J/kg
Mixed-layer LCL: 543 m above ground
0-6 km bulk shear: 24 kt
0-1 km storm-relative helicity: 146 m²/s²
0-3 km storm-relative helicity: 121 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.1

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
Jun 13, 4:06 PM EDT	Severe Thunderstorm Watch	SPC	Allegany, Broome, Cattaraugus, Cayuga, Chautauqua, Chemung and 34 more	7 hr
Jun 13, 7:12 PM EDT	Mesoscale Discussion	SPC	Allegany, Broome, Cattaraugus, Cayuga, Chautauqua, Chemung and 32 more	93 min
Jun 13, 6:10 PM EDT	Mesoscale Discussion	SPC	Allegheny, Armstrong, Beaver, Bedford, Blair, Butler and 31 more	95 min
Jun 13, 6:33 PM EDT	Severe Thunderstorm Watch	SPC	Allegheny, Armstrong, Beaver, Bedford, Blair, Butler and 30 more	4 hr

Nearby

Mesoscale Discussions in New York, 2018 Mesoscale Discussions in Pennsylvania, 2018 Every mesoscale discussion in 2018

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.