Alert archive / Vermont / Mesoscale Discussions in 2016

Mesoscale Discussion 1316

July 18, 20164 states

The Storm Prediction Center issued this mesoscale discussion at Jul 18, 2016, 10:32 AM EDT for 4 states. It was in force for 118 min.

The area

The outline as issued.

The facts

Issued: Jul 18, 2016, 10:32 AM EDT (14:32 UTC)
Expired: Jul 18, 2016, 12:30 PM EDT
In force: 118 min
Issued by: the Storm Prediction Center
Chance of a watch: 80%

All 39 counties

Androscoggin County, ME, Cumberland County, ME, Franklin County, ME, Kennebec County, ME, Lincoln County, ME, Oxford County, ME, Sagadahoc County, ME, Somerset County, ME, Waldo County, ME, York County, ME, Belknap County, NH, Carroll County, NH, Coos County, NH, Grafton County, NH, Merrimack County, NH, Rockingham County, NH, Strafford County, NH, Sullivan County, NH, Clinton County, NY, Essex County, NY, Franklin County, NY, Hamilton County, NY, Herkimer County, NY, Lewis County, NY, St. Lawrence County, NY, Warren County, NY, Washington County, NY, Addison County, VT, Caledonia County, VT, Chittenden County, VT, Essex County, VT, Franklin County, VT, Grand Isle County, VT, Lamoille County, VT, Orange County, VT, Orleans County, VT, Rutland County, VT, Washington County, VT, Windsor County, VT

The radar

The Burlington radar (KCXX), 50 km from the middle of the area, began a volume at 14:34 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

Gray, ME (KGYX), launched 12:00Z, 2.5 hours before the alert went out and 192 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: -141 J/kg
Mixed-layer LCL: 1173 m above ground
0-6 km bulk shear: 40 kt
0-1 km storm-relative helicity: 219 m²/s²
0-3 km storm-relative helicity: 216 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
Jul 18, 11:12 AM EDT	Severe Thunderstorm Watch	SPC	Androscoggin, Aroostook, Cumberland, Franklin, Hancock, Kennebec and 10 more	9 hr
Jul 18, 3:21 PM EDT	Mesoscale Discussion	SPC	Androscoggin, Aroostook, Cumberland, Franklin, Hancock, Kennebec and 10 more	84 min
Jul 18, 6:49 PM EDT	Mesoscale Discussion	SPC	Androscoggin, Aroostook, Cumberland, Franklin, Hancock, Kennebec and 10 more	86 min
Jul 18, 11:40 AM EDT	Mesoscale Discussion	SPC	Albany, Bronx, Columbia, Delaware, Dutchess, Fulton and 19 more	95 min
Jul 18, 12:05 PM EDT	Severe Thunderstorm Watch	SPC	Albany, Bronx, Broome, Cayuga, Chemung, Chenango and 37 more	8 hr

Nearby

Mesoscale Discussions in Vermont, 2016 Mesoscale Discussions in Maine, 2016 Mesoscale Discussions in New York, 2016 Every mesoscale discussion in 2016

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.