Alert archive / Ohio / Mesoscale Discussions in 2005

Mesoscale Discussion 612

April 20, 20054 states

The Storm Prediction Center issued this mesoscale discussion at Apr 20, 2005, 5:37 PM EST for 4 states. It was in force for 83 min.

The area

The outline as issued.

The facts

Issued: Apr 20, 2005, 5:37 PM EST (22:37 UTC)
Expired: Apr 20, 2005, 7:00 PM EST
In force: 83 min
Issued by: the Storm Prediction Center

All 74 counties

Adams County, IN, Benton County, IN, Blackford County, IN, Boone County, IN, Carroll County, IN, Cass County, IN, Clinton County, IN, Delaware County, IN, Fountain County, IN, Grant County, IN, Hamilton County, IN, Henry County, IN, Howard County, IN, Huntington County, IN, Jay County, IN, Madison County, IN, Miami County, IN, Montgomery County, IN, Randolph County, IN, Tippecanoe County, IN, Tipton County, IN, Vermillion County, IN, Wabash County, IN, Warren County, IN, Wells County, IN, White County, IN, Allen County, OH, Ashland County, OH, Auglaize County, OH, Carroll County, OH, Champaign County, OH, Columbiana County, OH, Coshocton County, OH, Crawford County, OH, Darke County, OH, Delaware County, OH, Franklin County, OH, Hancock County, OH, Hardin County, OH, Harrison County, OH, Holmes County, OH, Huron County, OH, Jefferson County, OH, Knox County, OH, Licking County, OH, Logan County, OH, Mahoning County, OH, Marion County, OH, Medina County, OH, Mercer County, OH, Miami County, OH, Morrow County, OH, Portage County, OH, Putnam County, OH, Richland County, OH, Seneca County, OH, Shelby County, OH, Stark County, OH, Summit County, OH, Trumbull County, OH, Tuscarawas County, OH, Union County, OH, Van Wert County, OH, Wayne County, OH, Wyandot County, OH, Armstrong County, PA, Beaver County, PA, Butler County, PA, Clarion County, PA, Forest County, PA, Lawrence County, PA, Mercer County, PA, Venango County, PA, Hancock County, WV

The radar

The Cincinnati radar (KILN), 153 km from the middle of the area, began a volume at 22:37 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

Cncnati-Daytn, OH (KILN), launched 12:00Z, 10.6 hours before the alert went out and 152 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: 1989 m above ground
0-6 km bulk shear: 10 kt
0-1 km storm-relative helicity: -29 m²/s²
0-3 km storm-relative helicity: 12 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
Apr 20, 12:21 PM EST	Mesoscale Discussion	SPC	Adams, Allen, Benton, Blackford, Boone, Carroll and 24 more	114 min
Apr 20, 12:50 PM EST	Severe Thunderstorm Watch	SPC	Adams, Allen, Benton, Blackford, Boone, Carroll and 26 more	6 hr
Apr 20, 3:19 PM EST	Mesoscale Discussion	SPC	Adams, Blackford, Carroll, Cass, Grant, Howard and 7 more	86 min
Apr 20, 2:05 PM EST	Mesoscale Discussion	SPC	Ashtabula, Carroll, Columbiana, Coshocton, Cuyahoga, Geauga and 11 more	85 min
Apr 20, 2:35 PM EST	Severe Thunderstorm Watch	SPC	Carroll, Columbiana, Coshocton, Geauga, Harrison, Holmes and 9 more	4 hr

Nearby

Mesoscale Discussions in Ohio, 2005 Mesoscale Discussions in Indiana, 2005 Mesoscale Discussions in Pennsylvania, 2005 Every mesoscale discussion in 2005

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.