Alert archive / Ohio / Mesoscale Discussions in 2015

Mesoscale Discussion 1482

July 19, 20154 states

The Storm Prediction Center issued this mesoscale discussion at Jul 19, 2015, 2:11 PM EDT for 4 states. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued: Jul 19, 2015, 2:11 PM EDT (18:11 UTC)
Expired: Jul 19, 2015, 4:15 PM EDT
In force: 2 hr
Issued by: the Storm Prediction Center
Chance of a watch: 40%

All 60 counties

Allegany County, NY, Cattaraugus County, NY, Chautauqua County, NY, Erie County, NY, Livingston County, NY, Wyoming County, NY, Ashland County, OH, Ashtabula County, OH, Carroll County, OH, Champaign County, OH, Columbiana County, OH, Coshocton County, OH, Crawford County, OH, Cuyahoga County, OH, Delaware County, OH, Erie County, OH, Geauga County, OH, Hancock County, OH, Hardin County, OH, Harrison County, OH, Holmes County, OH, Huron County, OH, Jefferson County, OH, Knox County, OH, Lake County, OH, Logan County, OH, Lorain County, OH, Mahoning County, OH, Marion County, OH, Medina County, OH, Morrow County, OH, Ottawa County, OH, Portage County, OH, Richland County, OH, Sandusky County, OH, Seneca County, OH, Stark County, OH, Summit County, OH, Trumbull County, OH, Tuscarawas County, OH, Union County, OH, Wayne County, OH, Wyandot County, OH, Armstrong County, PA, Beaver County, PA, Butler County, PA, Cameron County, PA, Clarion County, PA, Crawford County, PA, Elk County, PA, Erie County, PA, Forest County, PA, Jefferson County, PA, Lawrence County, PA, McKean County, PA, Mercer County, PA, Potter County, PA, Venango County, PA, Warren County, PA, Hancock County, WV

The radar

The Cleveland radar (KCLE), 92 km from the middle of the area, began a volume at 18:12 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 watches that followed

Watches SPC issued over any of the same counties within four hours of this discussion.

Severe Thunderstorm Watch 443Jul 19, 3:15 PM EDT

The nearest sounding before it

Pittsburgh, PA (KAGC), launched 12:00Z, 6.2 hours before the alert went out and 132 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: 66 J/kg
Mixed-layer CIN: -189 J/kg
Mixed-layer LCL: 1202 m above ground
0-6 km bulk shear: 22 kt
0-1 km storm-relative helicity: 119 m²/s²
0-3 km storm-relative helicity: 5 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, 1:36 PM EDT	Mesoscale Discussion	SPC	Albany, Cayuga, Chenango, Clinton, Cortland, Essex and 21 more	2 hr
Jul 19, 2:49 PM EDT	Severe Thunderstorm Watch	SPC	Albany, Clinton, Columbia, Dutchess, Essex, Franklin and 13 more	8 hr
Jul 19, 3:18 PM EDT	Severe Thunderstorm Watch	SPC	Allegany, Broome, Cattaraugus, Cayuga, Chautauqua, Chemung and 26 more	7 hr
Jul 19, 7:29 PM EDT	Mesoscale Discussion	SPC	Albany, Essex, Fulton, Hamilton, Herkimer, Montgomery and 6 more	91 min
Jul 18, 8:03 PM EDT	Mesoscale Discussion	SPC	Defiance, Paulding, Van Wert, Williams	57 min
Jul 19, 1:29 PM EDT	Mesoscale Discussion	SPC	Adams, Athens, Brown, Butler, Clark, Clermont and 24 more	91 min

Nearby

Mesoscale Discussions in Ohio, 2015 Mesoscale Discussions in Pennsylvania, 2015 Mesoscale Discussions in New York, 2015 Every mesoscale discussion in 2015

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.