Alert archive / Maine / Mesoscale Discussions in 2015

Mesoscale Discussion 55

February 2, 20154 counties in Maine; Coos County, Grafton County, New Hampshire; Essex County, Vermont

The Storm Prediction Center issued this mesoscale discussion at Feb 2, 2015, 8:48 AM EST for 4 counties in Maine; Coos County, Grafton County, New Hampshire; Essex County, Vermont. It was in force for 5 hr.

The area

The outline as issued.

The facts

Issued: Feb 2, 2015, 8:48 AM EST (13:48 UTC)
Expired: Feb 2, 2015, 1:45 PM EST
In force: 5 hr
Issued by: the Storm Prediction Center

Counties Franklin County, ME, Oxford County, ME, Penobscot County, ME, Somerset County, ME, Coos County, NH, Grafton County, NH, Essex County, VT

The radar

The Portland,ME radar (KGYX), 111 km from the middle of the area, began a volume at 13:52 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

Chatham, MA (KCHH), launched 12:00Z, 1.8 hours before the alert went out and 359 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: 476 m above ground
0-6 km bulk shear: 88 kt
0-1 km storm-relative helicity: 333 m²/s²
0-3 km storm-relative helicity: 944 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
Feb 2, 5:09 AM EST	Mesoscale Discussion	SPC	Androscoggin, Cumberland, Hancock, Kennebec, Knox, Lincoln and 3 more	6 hr
Feb 2, 2:14 PM EST	Mesoscale Discussion	SPC	Androscoggin, Cumberland, Franklin, Hancock, Kennebec, Knox and 7 more	5 hr
Feb 2, 4:00 AM EST	Mesoscale Discussion	SPC	Addison, Bennington, Chittenden, Franklin, Grand Isle, Lamoille and 5 more	6 hr

Nearby

Mesoscale Discussions in Maine, 2015 Mesoscale Discussions in New Hampshire, 2015 Mesoscale Discussions in Vermont, 2015 Every mesoscale discussion in 2015

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.