Alert archive / Maine / Mesoscale Discussions in 2012

Mesoscale Discussion 1560

July 24, 20127 counties in Maine; 5 counties in New Hampshire

The Storm Prediction Center issued this mesoscale discussion at Jul 24, 2012, 2:29 AM EDT for 7 counties in Maine; 5 counties in New Hampshire. It was in force for 31 min.

The area

The outline as issued.

The facts

Issued
Jul 24, 2012, 2:29 AM EDT (06:29 UTC)
Expired
Jul 24, 2012, 3:00 AM EDT
In force
31 min
Issued by
the Storm Prediction Center

Counties Androscoggin County, ME, Cumberland County, ME, Franklin County, ME, Kennebec County, ME, Oxford County, ME, Somerset County, ME, York County, ME, Belknap County, NH, Carroll County, NH, Coos County, NH, Grafton County, NH, Strafford County, NH

The radar

The Portland,ME radar (KGYX), 105 km from the middle of the area, began a volume at 06:30 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, 6.5 hours before the alert went out and 105 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 2012-07-24Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 908 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 2012-07-24The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 121 square meters per square second.1939Sfc1 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
908 J/kg
Mixed-layer CIN
-79 J/kg
Mixed-layer LCL
925 m above ground
0-6 km bulk shear
21 kt
0-1 km storm-relative helicity
121 m²/s²
0-3 km storm-relative helicity
158 m²/s²
Significant tornado parameter
0.0
Supercell composite
2.4

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.

IssuedProductOfficeCountiesLasted
Jul 24, 12:52 PM EDTMesoscale DiscussionSPCCumberland, Knox, Lincoln, Sagadahoc, York83 min
Jul 24, 1:38 PM EDTSevere Thunderstorm WatchSPCCheshire, Hillsborough6 hr

Nearby

Mesoscale Discussions in Maine, 2012Mesoscale Discussions in New Hampshire, 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.