Alert archive / Maine / Mesoscale Discussions in 2005

Mesoscale Discussion 1784

July 19, 200511 counties in Maine; 4 counties in Massachusetts; Rockingham County, Strafford County, New Hampshire

The Storm Prediction Center issued this mesoscale discussion at Jul 19, 2005, 5:31 PM EDT for 11 counties in Maine; 4 counties in Massachusetts; Rockingham County, Strafford County, New Hampshire. It was in force for 119 min.

The area

The outline as issued.

The facts

Issued: Jul 19, 2005, 5:31 PM EDT (21:31 UTC)
Expired: Jul 19, 2005, 7:30 PM EDT
In force: 119 min
Issued by: the Storm Prediction Center

Counties Essex County, MA, Middlesex County, MA, Norfolk County, MA, Suffolk County, MA, Androscoggin County, ME, Cumberland County, ME, Franklin County, ME, Hancock County, ME, Kennebec County, ME, Lincoln County, ME, Oxford County, ME, Sagadahoc County, ME, Waldo County, ME, Washington County, ME, York County, ME, Rockingham County, NH, Strafford County, NH

The radar

The Portland,ME radar (KGYX), 90 km from the middle of the area, began a volume at 21:34 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, 9.5 hours before the alert went out and 91 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: 820 J/kg
Mixed-layer CIN: -74 J/kg
Mixed-layer LCL: 917 m above ground
0-6 km bulk shear: 21 kt
0-1 km storm-relative helicity: 15 m²/s²
0-3 km storm-relative helicity: 49 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.2

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
Jul 19, 11:07 AM EDT	Mesoscale Discussion	SPC	Androscoggin, Aroostook, Cumberland, Franklin, Hancock, Kennebec and 10 more	83 min
Jul 19, 2:10 PM EDT	Severe Thunderstorm Watch	SPC	Androscoggin, Cumberland, Franklin, Kennebec, Oxford, Sagadahoc and 1 more	6 hr

Nearby

Mesoscale Discussions in Maine, 2005 Mesoscale Discussions in Massachusetts, 2005 Mesoscale Discussions in New Hampshire, 2005 Every mesoscale discussion in 2005

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.