Alert archive / Ohio / Mesoscale Discussions in 2004

Mesoscale Discussion 746

May 18, 200421 counties in Indiana; 37 counties in Ohio; Brooke County, Ohio County, West Virginia

The Storm Prediction Center issued this mesoscale discussion at May 18, 2004, 3:02 PM EST for 21 counties in Indiana; 37 counties in Ohio; Brooke County, Ohio County, West Virginia. It was in force for 118 min.

The area

The outline as issued.

The facts

Issued
May 18, 2004, 3:02 PM EST (20:02 UTC)
Expired
May 18, 2004, 5:00 PM EST
In force
118 min
Issued by
the Storm Prediction Center
All 60 counties

Adams County, IN, Blackford County, IN, Boone County, IN, Carroll County, IN, Cass County, IN, Clinton County, IN, Delaware County, IN, Grant County, IN, Hamilton 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, Wabash County, IN, Wells County, IN, White County, IN, Allen County, OH, Auglaize County, OH, Belmont County, OH, Champaign County, OH, Clark County, OH, Coshocton County, OH, Crawford County, OH, Darke County, OH, Delaware County, OH, Fairfield County, OH, Franklin County, OH, Guernsey County, OH, Hancock County, OH, Hardin County, OH, Harrison County, OH, Hocking County, OH, Holmes County, OH, Jefferson County, OH, Knox County, OH, Licking County, OH, Logan County, OH, Madison County, OH, Marion County, OH, Mercer County, OH, Miami County, OH, Monroe County, OH, Morgan County, OH, Morrow County, OH, Muskingum County, OH, Noble County, OH, Perry County, OH, Richland County, OH, Shelby County, OH, Tuscarawas County, OH, Union County, OH, Van Wert County, OH, Wyandot County, OH, Brooke County, WV, Ohio County, WV

The radar

The Cincinnati radar (KILN), 107 km from the middle of the area, began a volume at 20:06 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, 8.0 hours before the alert went out and 106 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-pSkew-T log-p diagram, Cncnati-Daytn, OH at 12:00Z on 2004-05-18Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1159 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Cncnati-Daytn, OH at 12:00Z on 2004-05-18The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 117 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
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
1159 J/kg
Mixed-layer CIN
-14 J/kg
Mixed-layer LCL
658 m above ground
0-6 km bulk shear
26 kt
0-1 km storm-relative helicity
117 m²/s²
0-3 km storm-relative helicity
110 m²/s²
Significant tornado parameter
0.4
Supercell composite
2.3

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.

IssuedProductOfficeCountiesLasted
May 18, 12:41 AM ESTMesoscale DiscussionSPCElkhart, LaGrange, Lake, LaPorte, Porter, Saint Joseph2 hr
May 18, 11:55 AM ESTMesoscale DiscussionSPCAdams, Allen, Benton, Blackford, Boone, Carroll and 34 more2 hr
May 18, 12:00 PM ESTSevere Thunderstorm WatchSPCVermillion7 hr
May 18, 12:45 PM ESTSevere Thunderstorm WatchSPCAdams, Allen, Bartholomew, Benton, Blackford, Boone and 49 more6 hr
May 18, 6:09 PM ESTMesoscale DiscussionSPCAdams, Bartholomew, Boone, Brown, Clay, Daviess and 38 more96 min
May 18, 11:54 AM ESTMesoscale DiscussionSPCBelmont, Carroll, Columbiana, Coshocton, Guernsey, Harrison and 13 more66 min
May 18, 12:14 PM ESTMesoscale DiscussionSPCBerkeley, Hampshire, Hardy, Jefferson, Pendleton2 hr
May 18, 1:54 PM ESTMesoscale DiscussionSPCBerkeley, Mineral, Morgan96 min
May 18, 6:49 PM ESTMesoscale DiscussionSPCBerkeley, Jefferson2 hr

Nearby

Mesoscale Discussions in Ohio, 2004Mesoscale Discussions in Indiana, 2004Mesoscale Discussions in West Virginia, 2004Every 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.