Alert archive / Ohio / Mesoscale Discussions in 2004

Mesoscale Discussion 1879

August 4, 20044 states

The Storm Prediction Center issued this mesoscale discussion at Aug 4, 2004, 10:39 AM EDT for 4 states. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued: Aug 4, 2004, 10:39 AM EDT (14:39 UTC)
Expired: Aug 4, 2004, 12:45 PM EDT
In force: 2 hr
Issued by: the Storm Prediction Center

All 84 counties

Boone County, KY, Bracken County, KY, Campbell County, KY, Greenup County, KY, Kenton County, KY, Lewis County, KY, Mason County, KY, Pendleton County, KY, Adams County, OH, Ashland County, OH, Athens County, OH, Belmont County, OH, Brown County, OH, Carroll County, OH, Clermont County, OH, Clinton County, OH, Columbiana County, OH, Coshocton County, OH, Delaware County, OH, Fairfield County, OH, Fayette County, OH, Franklin County, OH, Gallia County, OH, Greene County, OH, Guernsey County, OH, Hamilton County, OH, Harrison County, OH, Highland County, OH, Hocking County, OH, Holmes County, OH, Jackson County, OH, Jefferson County, OH, Knox County, OH, Lawrence County, OH, Licking County, OH, Madison County, OH, Mahoning County, OH, Marion County, OH, Meigs County, OH, Monroe County, OH, Morgan County, OH, Morrow County, OH, Muskingum County, OH, Noble County, OH, Perry County, OH, Pickaway County, OH, Pike County, OH, Richland County, OH, Ross County, OH, Scioto County, OH, Stark County, OH, Tuscarawas County, OH, Union County, OH, Vinton County, OH, Warren County, OH, Washington County, OH, Wayne County, OH, Allegheny County, PA, Beaver County, PA, Fayette County, PA, Greene County, PA, Washington County, PA, Westmoreland County, PA, Brooke County, WV, Calhoun County, WV, Doddridge County, WV, Gilmer County, WV, Hancock County, WV, Harrison County, WV, Jackson County, WV, Lewis County, WV, Marion County, WV, Marshall County, WV, Mason County, WV, Monongalia County, WV, Ohio County, WV, Pleasants County, WV, Ritchie County, WV, Roane County, WV, Taylor County, WV, Tyler County, WV, Wetzel County, WV, Wirt County, WV, Wood County, WV

The radar

The Cincinnati radar (KILN), 149 km from the middle of the area, began a volume at 14:42 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.

The nearest sounding before it

Cncnati-Daytn, OH (KILN), launched 12:00Z, 2.7 hours before the alert went out and 147 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: 694 J/kg
Mixed-layer CIN: -60 J/kg
Mixed-layer LCL: 886 m above ground
0-6 km bulk shear: 3 kt
0-1 km storm-relative helicity: 2 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
Aug 4, 2:01 PM EDT	Mesoscale Discussion	SPC	Anderson, Bath, Bourbon, Boyd, Boyle, Bracken and 66 more	89 min
Aug 4, 2:30 PM EDT	Severe Thunderstorm Watch	SPC	Adair, Anderson, Barren, Bath, Bourbon, Boyd and 69 more	6 hr
Aug 4, 2:31 PM EDT	Mesoscale Discussion	SPC	Boyd, Fleming, Greenup, Lewis	119 min
Aug 4, 4:39 PM EDT	Mesoscale Discussion	SPC	Adair, Allen, Anderson, Barren, Bath, Bell and 101 more	96 min
Aug 3, 11:35 PM EDT	Severe Thunderstorm Watch	SPC	Defiance, Fulton, Paulding, Williams	5 hr
Aug 4, 2:15 AM EDT	Mesoscale Discussion	SPC	Defiance, Paulding, Williams	90 min
Aug 4, 6:44 AM EDT	Mesoscale Discussion	SPC	Allen, Auglaize, Champaign, Clark, Crawford, Darke and 14 more	2 hr
Aug 4, 11:55 AM EDT	Severe Thunderstorm Watch	SPC	Adams, Athens, Belmont, Carroll, Columbiana, Coshocton and 24 more	5 hr
Aug 4, 2:55 PM EDT	Severe Thunderstorm Watch	SPC	Adams, Bedford, Blair, Cambria, Carbon, Centre and 20 more	6 hr
Aug 4, 5:48 PM EDT	Mesoscale Discussion	SPC	Adams, Berks, Bucks, Carbon, Chester, Cumberland and 11 more	117 min
Aug 4, 7:10 PM EDT	Severe Thunderstorm Watch	SPC	Chester, Delaware, Lancaster, Montgomery, Philadelphia	4 hr

Nearby

Mesoscale Discussions in Ohio, 2004 Mesoscale Discussions in West Virginia, 2004 Mesoscale Discussions in Kentucky, 2004 Every mesoscale discussion in 2004

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.