Alert archive / Maine / Mesoscale Discussions in 2008

Mesoscale Discussion 1817

July 19, 2008Piscataquis County, Maine

The Storm Prediction Center issued this mesoscale discussion at Jul 19, 2008, 6:42 PM EDT for Piscataquis County, Maine. It was in force for 63 min.

The area

The outline as issued.

The facts

Issued: Jul 19, 2008, 6:42 PM EDT (22:42 UTC)
Expired: Jul 19, 2008, 7:45 PM EDT
In force: 63 min
Issued by: the Storm Prediction Center

County Piscataquis County, ME

The nearest sounding before it

Caribou, ME (KCAR), launched 12:00Z, 10.7 hours before the alert went out and 118 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: 7 J/kg
Mixed-layer CIN: -13 J/kg
Mixed-layer LCL: 533 m above ground
0-6 km bulk shear: 46 kt
0-1 km storm-relative helicity: -12 m²/s²
0-3 km storm-relative helicity: 56 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
Jul 19, 12:04 PM EDT	Mesoscale Discussion	SPC	Oxford	116 min
Jul 19, 1:26 PM EDT	Severe Thunderstorm Watch	SPC	Androscoggin, Cumberland, Oxford, Sagadahoc, York	7 hr
Jul 19, 4:44 PM EDT	Mesoscale Discussion	SPC	Cumberland, York	91 min

Nearby

Mesoscale Discussions in Maine, 2008 Every mesoscale discussion in 2008

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.