Alert archive / Maine / Mesoscale Discussions in 2007

Mesoscale Discussion 69

January 15, 20074 states

The Storm Prediction Center issued this mesoscale discussion at Jan 15, 2007, 10:33 AM EST for 4 states. It was in force for 5 hr.

The area

The outline as issued.

The facts

Issued: Jan 15, 2007, 10:33 AM EST (15:33 UTC)
Expired: Jan 15, 2007, 3:30 PM EST
In force: 5 hr
Issued by: the Storm Prediction Center

All 24 counties

Androscoggin County, ME, Cumberland County, ME, Franklin County, ME, Hancock County, ME, Kennebec County, ME, Knox County, ME, Lincoln County, ME, Oxford County, ME, Penobscot County, ME, Piscataquis County, ME, Sagadahoc County, ME, Somerset County, ME, Waldo County, ME, Washington County, ME, Coos County, NH, Clinton County, NY, Caledonia County, VT, Chittenden County, VT, Essex County, VT, Franklin County, VT, Grand Isle County, VT, Lamoille County, VT, Orleans County, VT, Washington County, VT

The radar

The Portland,ME radar (KGYX), 118 km from the middle of the area, began a volume at 15:35 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, 3.6 hours before the alert went out and 118 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: 1282 m above ground
0-6 km bulk shear: 0 kt
0-1 km storm-relative helicity: 0 m²/s²
0-3 km storm-relative helicity: 0 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
Jan 15, 1:32 PM EST	Mesoscale Discussion	SPC	Androscoggin, Cumberland, Kennebec, Knox, Lincoln, Oxford and 3 more	4 hr
Jan 15, 7:50 AM EST	Mesoscale Discussion	SPC	Belknap, Cheshire, Hillsborough, Merrimack, Sullivan	4 hr
Jan 15, 12:14 AM EST	Mesoscale Discussion	SPC	Albany, Allegany, Broome, Cattaraugus, Cayuga, Chemung and 23 more	6 hr

Nearby

Mesoscale Discussions in Maine, 2007 Mesoscale Discussions in Vermont, 2007 Mesoscale Discussions in New Hampshire, 2007 Every mesoscale discussion in 2007

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.