Alert archive / Maine / Mesoscale Discussions in 2003

Mesoscale Discussion 2473

October 29, 20039 counties in Maine; 7 counties in Massachusetts; Rockingham County, Strafford County, New Hampshire

The Storm Prediction Center issued this mesoscale discussion at Oct 29, 2003, 10:16 AM EST for 9 counties in Maine; 7 counties in Massachusetts; Rockingham County, Strafford County, New Hampshire. It was in force for 89 min.

The area

The outline as issued.

The facts

Issued: Oct 29, 2003, 10:16 AM EST (15:16 UTC)
Expired: Oct 29, 2003, 11:45 AM EST
In force: 89 min
Issued by: the Storm Prediction Center

Counties Barnstable County, MA, Essex County, MA, Middlesex County, MA, Nantucket County, MA, Norfolk County, MA, Plymouth County, MA, Suffolk County, MA, Androscoggin County, ME, Cumberland County, ME, Hancock County, ME, Kennebec County, ME, Knox County, ME, Lincoln County, ME, Sagadahoc County, ME, Waldo County, ME, York County, ME, Rockingham County, NH, Strafford County, NH

The radar

The Portland,ME radar (KGYX), 103 km from the middle of the area, began a volume at 15:19 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

Albany, NY (KALY), launched 12:00Z, 3.3 hours before the alert went out and 299 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: 504 m above ground
0-6 km bulk shear: 72 kt
0-1 km storm-relative helicity: 148 m²/s²
0-3 km storm-relative helicity: 424 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 29, 8:33 AM EST	Mesoscale Discussion	SPC	Bristol, Hampden, Hampshire, Worcester	117 min

Nearby

Mesoscale Discussions in Maine, 2003 Mesoscale Discussions in Massachusetts, 2003 Mesoscale Discussions in New Hampshire, 2003 Every mesoscale discussion in 2003

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.