Alert archive / Maine / Mesoscale Discussions in 2019

Mesoscale Discussion 42

January 20, 201916 counties in Maine; 7 counties in Massachusetts; 10 counties in New Hampshire

The Storm Prediction Center issued this mesoscale discussion at Jan 20, 2019, 1:01 PM EST for 16 counties in Maine; 7 counties in Massachusetts; 10 counties in New Hampshire. It was in force for 4 hr.

The area

The outline as issued.

The facts

Issued: Jan 20, 2019, 1:01 PM EST (18:01 UTC)
Expired: Jan 20, 2019, 5:00 PM EST
In force: 4 hr
Issued by: the Storm Prediction Center

All 33 counties

Essex County, MA, Franklin County, MA, Hampshire County, MA, Middlesex County, MA, Norfolk County, MA, Suffolk County, MA, Worcester County, MA, Androscoggin County, ME, Aroostook County, ME, Cumberland County, ME, Franklin County, ME, Hancock County, ME, Kennebec County, ME, Knox County, ME, Lincoln County, ME, Oxford County, ME, Penobscot County, ME, Piscataquis County, ME, Sagadahoc County, ME, Somerset County, ME, Waldo County, ME, Washington County, ME, York County, ME, Belknap County, NH, Carroll County, NH, Cheshire County, NH, Coos County, NH, Grafton County, NH, Hillsborough County, NH, Merrimack County, NH, Rockingham County, NH, Strafford County, NH, Sullivan County, NH

The radar

The Portland,ME radar (KGYX), 82 km from the middle of the area, began a volume at 18:00 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

Chatham, MA (KCHH), launched 12:00Z, 6.0 hours before the alert went out and 322 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: 452 m above ground
0-6 km bulk shear: 63 kt
0-1 km storm-relative helicity: 452 m²/s²
0-3 km storm-relative helicity: 447 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.

Issued	Product	Office	Counties	Lasted
Jan 20, 6:42 AM EST	Mesoscale Discussion	SPC	Androscoggin, Aroostook, Cumberland, Franklin, Hancock, Kennebec and 10 more	6 hr
Jan 20, 12:46 AM EST	Mesoscale Discussion	SPC	Belknap, Carroll, Cheshire, Coos, Grafton, Hillsborough and 3 more	4 hr

Nearby

Mesoscale Discussions in Maine, 2019 Mesoscale Discussions in New Hampshire, 2019 Mesoscale Discussions in Massachusetts, 2019 Every mesoscale discussion in 2019

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.