Alert archive / Maine / Mesoscale Discussions in 2007

Mesoscale Discussion 1893

August 25, 200716 counties in Maine; Belknap County, Carroll County, Grafton County, New Hampshire

The Storm Prediction Center issued this mesoscale discussion at Aug 25, 2007, 6:48 PM EDT for 16 counties in Maine; Belknap County, Carroll County, Grafton County, New Hampshire. It was in force for 87 min.

The area

The outline as issued.

The facts

Issued: Aug 25, 2007, 6:48 PM EDT (22:48 UTC)
Expired: Aug 25, 2007, 8:15 PM EDT
In force: 87 min
Issued by: the Storm Prediction Center

Counties Androscoggin County, ME, Aroostook 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, York County, ME, Belknap County, NH, Carroll County, NH, Grafton County, NH

The radar

The Portland,ME radar (KGYX), 88 km from the middle of the area, began a volume at 22:50 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

Caribou, ME (KCAR), launched 12:00Z, 10.8 hours before the alert went out and 288 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: 647 m above ground
0-6 km bulk shear: 19 kt
0-1 km storm-relative helicity: 22 m²/s²
0-3 km storm-relative helicity: 15 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
Aug 25, 2:36 PM EDT	Mesoscale Discussion	SPC	Androscoggin, Franklin, Kennebec, Oxford, Penobscot, Piscataquis and 1 more	84 min
Aug 25, 3:16 PM EDT	Severe Thunderstorm Watch	SPC	Androscoggin, Aroostook, Cumberland, Franklin, Hancock, Kennebec and 10 more	8 hr
Aug 25, 4:26 PM EDT	Mesoscale Discussion	SPC	Androscoggin, Cumberland, Franklin, Kennebec, Oxford, Penobscot and 3 more	94 min

Nearby

Mesoscale Discussions in Maine, 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.