Alert archive / Maine / Mesoscale Discussions in 2012

Mesoscale Discussion 1942

September 8, 20128 counties in Maine; 4 counties in Massachusetts; Newport County, Rhode Island

The Storm Prediction Center issued this mesoscale discussion at Sep 8, 2012, 10:01 PM EDT for 8 counties in Maine; 4 counties in Massachusetts; Newport County, Rhode Island. It was in force for 59 min.

The area

The outline as issued.

The facts

Issued
Sep 8, 2012, 10:01 PM EDT (02:01 UTC)
Expired
Sep 8, 2012, 11:00 PM EDT
In force
59 min
Issued by
the Storm Prediction Center

Counties Barnstable County, MA, Bristol County, MA, Dukes County, MA, Plymouth County, MA, Androscoggin County, ME, Cumberland County, ME, Kennebec County, ME, Lincoln County, ME, Piscataquis County, ME, Sagadahoc County, ME, Somerset County, ME, Waldo County, ME, Newport County, RI

The radar

The Portland,ME radar (KGYX), 19 km from the middle of the area, began a volume at 02:01 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, 2.0 hours before the alert went out and 20 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-pSkew-T log-p diagram, Gray, ME at 00:00Z on 2012-09-09Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 463 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Gray, ME at 00:00Z on 2012-09-09The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 266 square meters per square second.1939587897Sfc1 km3 km6 km9 kmRMLM
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
463 J/kg
Mixed-layer CIN
-10 J/kg
Mixed-layer LCL
481 m above ground
0-6 km bulk shear
37 kt
0-1 km storm-relative helicity
266 m²/s²
0-3 km storm-relative helicity
297 m²/s²
Significant tornado parameter
0.5
Supercell composite
3.7

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

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Nearby

Mesoscale Discussions in Maine, 2012Mesoscale Discussions in Massachusetts, 2012Mesoscale Discussions in Rhode Island, 2012Every 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.