Alert archive / Ohio / Mesoscale Discussions in 2017

Mesoscale Discussion 37

January 12, 201718 counties in Ohio; 16 counties in Pennsylvania; 4 counties in West Virginia

The Storm Prediction Center issued this mesoscale discussion at Jan 12, 2017, 2:22 PM EST for 18 counties in Ohio; 16 counties in Pennsylvania; 4 counties in West Virginia. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued: Jan 12, 2017, 2:22 PM EST (19:22 UTC)
Expired: Jan 12, 2017, 4:45 PM EST
In force: 2 hr
Issued by: the Storm Prediction Center
Chance of a watch: 5%

All 38 counties

Belmont County, OH, Carroll County, OH, Coshocton County, OH, Fairfield County, OH, Fayette County, OH, Guernsey County, OH, Harrison County, OH, Hocking County, OH, Jefferson County, OH, Licking County, OH, Monroe County, OH, Morgan County, OH, Muskingum County, OH, Noble County, OH, Perry County, OH, Pickaway County, OH, Ross County, OH, Tuscarawas County, OH, Allegheny County, PA, Armstrong County, PA, Beaver County, PA, Butler County, PA, Cambria County, PA, Cameron County, PA, Centre County, PA, Clarion County, PA, Clearfield County, PA, Clinton County, PA, Elk County, PA, Indiana County, PA, Jefferson County, PA, Lycoming County, PA, Washington County, PA, Westmoreland County, PA, Brooke County, WV, Hancock County, WV, Marshall County, WV, Ohio County, WV

The radar

The Pittsburgh radar (KPBZ), 44 km from the middle of the area, began a volume at 19:26 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

Pittsburgh, PA (KAGC), launched 12:00Z, 7.4 hours before the alert went out and 49 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: 840 m above ground
0-6 km bulk shear: 72 kt
0-1 km storm-relative helicity: 545 m²/s²
0-3 km storm-relative helicity: 564 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 12, 10:42 AM EST	Mesoscale Discussion	SPC	Adams, Ashland, Athens, Belmont, Brown, Butler and 47 more	3 hr

Nearby

Mesoscale Discussions in Ohio, 2017 Mesoscale Discussions in Pennsylvania, 2017 Mesoscale Discussions in West Virginia, 2017 Every mesoscale discussion in 2017

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.