Alert archive / Vermont / Mesoscale Discussions in 2017

Mesoscale Discussion 132

January 23, 20174 states

The Storm Prediction Center issued this mesoscale discussion at Jan 23, 2017, 11:48 PM EST for 4 states. It was in force for 6 hr.

The area

The outline as issued.

The facts

Issued: Jan 23, 2017, 11:48 PM EST (04:48 UTC)
Expired: Jan 24, 2017, 5:45 AM EST
In force: 6 hr
Issued by: the Storm Prediction Center

All 27 counties

Androscoggin County, ME, Cumberland County, ME, Kennebec County, ME, Oxford County, ME, Sagadahoc County, ME, Waldo County, ME, York County, ME, Belknap County, NH, Carroll County, NH, Coos County, NH, Grafton County, NH, Hillsborough County, NH, Merrimack County, NH, Rockingham County, NH, Strafford County, NH, Sullivan County, NH, Essex County, NY, Addison County, VT, Caledonia County, VT, Chittenden County, VT, Essex County, VT, Lamoille County, VT, Orange County, VT, Orleans County, VT, Rutland County, VT, Washington County, VT, Windsor County, VT

The radar

The Portland,ME radar (KGYX), 98 km from the middle of the area, began a volume at 04:47 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

Gray, ME (KGYX), launched 00:00Z, 4.8 hours before the alert went out and 98 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: 714 m above ground
0-6 km bulk shear: 20 kt
0-1 km storm-relative helicity: 181 m²/s²
0-3 km storm-relative helicity: 285 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
Jan 24, 5:44 AM EST	Mesoscale Discussion	SPC	Androscoggin, Cumberland, Franklin, Hancock, Kennebec, Knox and 9 more	6 hr
Jan 24, 12:12 PM EST	Mesoscale Discussion	SPC	Aroostook, Franklin, Penobscot, Piscataquis, Somerset, Washington	6 hr
Jan 23, 8:14 PM EST	Mesoscale Discussion	SPC	Albany, Broome, Chenango, Cortland, Delaware, Fulton and 9 more	6 hr

Nearby

Mesoscale Discussions in Vermont, 2017 Mesoscale Discussions in New Hampshire, 2017 Mesoscale Discussions in Maine, 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.