Alert archive / Vermont / Mesoscale Discussions in 2017
Mesoscale Discussion 172
The Storm Prediction Center issued this mesoscale discussion at Feb 12, 2017, 2:51 PM EST for 5 states. It was in force for 4 hr.
The area
The outline as issued.
The facts
- Issued
- Feb 12, 2017, 2:51 PM EST (19:51 UTC)
- Expired
- Feb 12, 2017, 7:15 PM EST
- In force
- 4 hr
- Issued by
- the Storm Prediction Center
All 36 counties
Essex County, MA, Middlesex County, MA, Androscoggin County, ME, Cumberland County, ME, Franklin County, ME, Kennebec County, ME, Lincoln County, ME, Oxford County, ME, Sagadahoc County, ME, Waldo County, ME, York County, ME, Belknap County, NH, Carroll County, NH, Cheshire County, NH, Coos County, NH, Grafton County, NH, Hillsborough County, NH, Merrimack County, NH, Rockingham County, NH, Strafford County, NH, Sullivan County, NH, Clinton County, NY, Essex 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, Windham County, VT, Windsor County, VT
The radar
The Portland,ME radar (KGYX), 72 km from the middle of the area, began a volume at 19:51 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 12:00Z, 7.9 hours before the alert went out and 71 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.
- Mixed-layer CAPE
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 436 m above ground
- 0-6 km bulk shear
- 71 kt
- 0-1 km storm-relative helicity
- 202 m²/s²
- 0-3 km storm-relative helicity
- 289 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
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</html>SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Feb 12, 9:59 AM EST | Mesoscale Discussion | SPC | Berkshire, Bristol, Essex, Franklin, Hampden, Hampshire and 4 more | 5 hr |
| Feb 12, 10:36 AM EST | Mesoscale Discussion | SPC | Bronx, Cayuga, Chenango, Cortland, Delaware, Dutchess and 13 more | 24 min |
| Feb 12, 12:02 PM EST | Mesoscale Discussion | SPC | Bronx, Cayuga, Chenango, Cortland, Delaware, Dutchess and 13 more | 4 hr |
Nearby
Mesoscale Discussions in Vermont, 2017Mesoscale Discussions in New Hampshire, 2017Mesoscale Discussions in Maine, 2017Every 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.