Alert archive / Ohio / Mesoscale Discussions in 2017

Mesoscale Discussion 1253

July 7, 201717 counties in Ohio; 5 counties in Pennsylvania; 4 counties in West Virginia

The Storm Prediction Center issued this mesoscale discussion at Jul 7, 2017, 8:02 AM EDT for 17 counties in Ohio; 5 counties in Pennsylvania; 4 counties in West Virginia. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued: Jul 7, 2017, 8:02 AM EDT (12:02 UTC)
Expired: Jul 7, 2017, 10:30 AM EDT
In force: 2 hr
Issued by: the Storm Prediction Center
Chance of a watch: 20%

All 26 counties

Belmont County, OH, Carroll County, OH, Columbiana County, OH, Coshocton County, OH, Geauga County, OH, Guernsey County, OH, Harrison County, OH, Holmes County, OH, Jefferson County, OH, Mahoning County, OH, Medina County, OH, Portage County, OH, Stark County, OH, Summit County, OH, Trumbull County, OH, Tuscarawas County, OH, Wayne County, OH, Beaver County, PA, Butler County, PA, Lawrence County, PA, Mercer County, PA, Washington County, PA, Brooke County, WV, Hancock County, WV, Marshall County, WV, Ohio County, WV

The radar

The Pittsburgh radar (KPBZ), 71 km from the middle of the area, began a volume at 12:02 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, 0.0 hours before the alert went out and 86 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: 8 J/kg
Mixed-layer CIN: -139 J/kg
Mixed-layer LCL: 872 m above ground
0-6 km bulk shear: 28 kt
0-1 km storm-relative helicity: 70 m²/s²
0-3 km storm-relative helicity: 69 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
Jul 7, 8:51 AM EDT	Mesoscale Discussion	SPC	Allen, Auglaize, Darke, Defiance, Mercer, Paulding and 3 more	114 min
Jul 7, 9:46 AM EDT	Severe Thunderstorm Watch	SPC	Allen, Auglaize, Champaign, Clark, Crawford, Darke and 32 more	7 hr
Jul 7, 11:22 AM EDT	Mesoscale Discussion	SPC	Allen, Auglaize, Butler, Champaign, Clark, Clinton and 30 more	53 min
Jul 7, 1:07 PM EDT	Mesoscale Discussion	SPC	Athens, Belmont, Gallia, Guernsey, Jackson, Lawrence and 11 more	53 min
Jul 7, 1:27 PM EDT	Severe Thunderstorm Watch	SPC	Athens, Belmont, Carroll, Coshocton, Gallia, Guernsey and 13 more	8 hr
Jul 7, 3:35 PM EDT	Mesoscale Discussion	SPC	Athens, Belmont, Gallia, Meigs, Monroe, Morgan and 3 more	85 min
Jul 7, 3:54 PM EDT	Mesoscale Discussion	SPC	Adams, Brown, Butler, Clermont, Clinton, Greene and 7 more	96 min
Jul 7, 4:24 PM EDT	Severe Thunderstorm Watch	SPC	Adams, Brown, Butler, Clermont, Clinton, Fayette and 9 more	7 hr
Jul 7, 6:34 PM EDT	Mesoscale Discussion	SPC	Adams, Gallia, Jackson, Lawrence, Scioto	86 min

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.