Alert archive / Vermont / Mesoscale Discussions in 2012

Mesoscale Discussion 2241

December 26, 20126 counties in New Hampshire; 10 counties in New York; 12 counties in Vermont

The Storm Prediction Center issued this mesoscale discussion at Dec 26, 2012, 8:22 PM EST for 6 counties in New Hampshire; 10 counties in New York; 12 counties in Vermont. It was in force for 6 hr.

The area

The outline as issued.

The facts

Issued: Dec 26, 2012, 8:22 PM EST (01:22 UTC)
Expired: Dec 27, 2012, 2:15 AM EST
In force: 6 hr
Issued by: the Storm Prediction Center

All 28 counties

Belknap County, NH, Carroll County, NH, Coos County, NH, Grafton County, NH, Merrimack County, NH, Sullivan County, NH, Clinton County, NY, Essex County, NY, Franklin County, NY, Hamilton County, NY, Herkimer County, NY, Jefferson 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), 73 km from the middle of the area, began a volume at 01:22 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 nearest sounding before it

Gray, ME (KGYX), launched 00:00Z, 1.4 hours before the alert went out and 284 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: 1247 m above ground
0-6 km bulk shear: 39 kt
0-1 km storm-relative helicity: 32 m²/s²
0-3 km storm-relative helicity: 134 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

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SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Dec 27, 3:52 AM EST	Mesoscale Discussion	SPC	Carroll, Coos, Strafford	6 hr

Nearby

Mesoscale Discussions in Vermont, 2012 Mesoscale Discussions in New York, 2012 Mesoscale Discussions in New Hampshire, 2012 Every mesoscale discussion in 2012

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.