Alert archive / Maine / Mesoscale Discussions in 2012

Mesoscale Discussion 2093

October 30, 20125 states

The Storm Prediction Center issued this mesoscale discussion at Oct 30, 2012, 5:51 AM EDT for 5 states. It was in force for 114 min.

The area

The outline as issued.

The facts

Issued: Oct 30, 2012, 5:51 AM EDT (09:51 UTC)
Expired: Oct 30, 2012, 7:45 AM EDT
In force: 114 min
Issued by: the Storm Prediction Center
Chance of a watch: 40%

All 45 counties

Barnstable County, MA, Bristol County, MA, Dukes County, MA, Essex County, MA, Franklin County, MA, Hampden County, MA, Hampshire County, MA, Middlesex County, MA, Nantucket County, MA, Norfolk County, MA, Plymouth County, MA, Suffolk County, MA, Worcester County, MA, 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, Sagadahoc County, ME, Waldo County, ME, Washington 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, Bristol County, RI, Kent County, RI, Newport County, RI, Providence County, RI, Washington County, RI, Orange County, VT, Rutland County, VT, Windham County, VT, Windsor County, VT

The radar

The Portland,ME radar (KGYX), 93 km from the middle of the area, began a volume at 09:52 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, 9.9 hours before the alert went out and 93 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: 468 m above ground
0-6 km bulk shear: 55 kt
0-1 km storm-relative helicity: 612 m²/s²
0-3 km storm-relative helicity: 866 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
Oct 30, 10:42 AM EDT	Mesoscale Discussion	SPC	Androscoggin, Cumberland, Kennebec, Knox, Lincoln, Sagadahoc and 1 more	93 min

Nearby

Mesoscale Discussions in Maine, 2012 Mesoscale Discussions in Massachusetts, 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.