Alert archive / Maine / Mesoscale Discussions in 2018

Mesoscale Discussion 8

January 4, 2018Hancock County, Washington County, Maine

The Storm Prediction Center issued this mesoscale discussion at Jan 4, 2018, 4:50 PM EST for Hancock County, Washington County, Maine. It was in force for 5 hr.

The area

The outline as issued.

The facts

Issued
Jan 4, 2018, 4:50 PM EST (21:50 UTC)
Expired
Jan 4, 2018, 9:45 PM EST
In force
5 hr
Issued by
the Storm Prediction Center

Counties Hancock County, ME, Washington County, ME

The radar

The Caribou radar (KCBW), 151 km from the middle of the area, began a volume at 21:53 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, 9.8 hours before the alert went out and 206 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 12:00Z on 2018-01-04Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 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 12:00Z on 2018-01-04The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 305 square meters per square second.1939587897117136Sfc1 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
836 m above ground
0-6 km bulk shear
69 kt
0-1 km storm-relative helicity
305 m²/s²
0-3 km storm-relative helicity
358 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

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SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Jan 4, 11:34 AM ESTMesoscale DiscussionSPCAndroscoggin, Cumberland, Franklin, Hancock, Kennebec, Knox and 8 more5 hr
Jan 4, 3:06 PM ESTMesoscale DiscussionSPCAroostook, Franklin, Piscataquis, Somerset5 hr

Nearby

Mesoscale Discussions in Maine, 2018Every mesoscale discussion in 2018

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.