Alert archive / New York / Mesoscale Discussions in 2018

Mesoscale Discussion 779

June 18, 20184 counties in New Hampshire; 28 counties in New York; 8 counties in Vermont

The Storm Prediction Center issued this mesoscale discussion at Jun 18, 2018, 12:19 PM EDT for 4 counties in New Hampshire; 28 counties in New York; 8 counties in Vermont. It was in force for 116 min.

The area

The outline as issued.

The facts

Issued: Jun 18, 2018, 12:19 PM EDT (16:19 UTC)
Expired: Jun 18, 2018, 2:15 PM EDT
In force: 116 min
Issued by: the Storm Prediction Center
Chance of a watch: 60%

All 40 counties

Belknap County, NH, Carroll County, NH, Grafton County, NH, Sullivan County, NH, Cayuga County, NY, Chenango County, NY, Cortland County, NY, Essex County, NY, Fulton County, NY, Genesee County, NY, Hamilton County, NY, Herkimer County, NY, Jefferson County, NY, Lewis County, NY, Livingston County, NY, Madison County, NY, Montgomery County, NY, Oneida County, NY, Onondaga County, NY, Ontario County, NY, Oswego County, NY, Otsego County, NY, Saratoga County, NY, Schuyler County, NY, Seneca County, NY, Steuben County, NY, Tompkins County, NY, Warren County, NY, Washington County, NY, Wayne County, NY, Wyoming County, NY, Yates County, NY, Addison County, VT, Caledonia County, VT, Chittenden County, VT, Lamoille County, VT, Orange County, VT, Rutland County, VT, Washington County, VT, Windsor County, VT

The radar

The Ft Drum radar (KTYX), 34 km from the middle of the area, began a volume at 16:22 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, 4.3 hours before the alert went out and 161 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: 1 J/kg
Mixed-layer CIN: -297 J/kg
Mixed-layer LCL: 1389 m above ground
0-6 km bulk shear: 35 kt
0-1 km storm-relative helicity: 167 m²/s²
0-3 km storm-relative helicity: 159 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
Jun 18, 2:49 PM EDT	Severe Thunderstorm Watch	SPC	Belknap, Carroll, Cheshire, Grafton, Hillsborough, Merrimack and 3 more	5 hr
Jun 18, 7:05 PM EDT	Mesoscale Discussion	SPC	Belknap, Carroll, Grafton, Hillsborough, Merrimack, Rockingham and 2 more	55 min
Jun 18, 1:33 PM EDT	Severe Thunderstorm Watch	SPC	Cayuga, Erie, Genesee, Jefferson, Lewis, Livingston and 12 more	6 hr
Jun 18, 4:04 PM EDT	Mesoscale Discussion	SPC	Albany, Broome, Chemung, Chenango, Columbia, Cortland and 14 more	26 min
Jun 18, 5:55 PM EDT	Mesoscale Discussion	SPC	Bronx, Dutchess, Kings, New York, Orange, Putnam and 4 more	2 hr

Nearby

Mesoscale Discussions in New York, 2018 Mesoscale Discussions in Vermont, 2018 Mesoscale Discussions in New Hampshire, 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.