Alert archive / Indiana / Mesoscale Discussions in 2004

Mesoscale Discussion 738

May 18, 200440 counties in Indiana; 11 counties in Ohio

The Storm Prediction Center issued this mesoscale discussion at May 18, 2004, 11:55 AM EST for 40 counties in Indiana; 11 counties in Ohio. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued
May 18, 2004, 11:55 AM EST (16:55 UTC)
Expired
May 18, 2004, 2:00 PM EST
In force
2 hr
Issued by
the Storm Prediction Center
All 51 counties

Adams County, IN, Allen County, IN, Benton County, IN, Blackford County, IN, Boone County, IN, Carroll County, IN, Cass County, IN, Clinton County, IN, Delaware County, IN, Fayette County, IN, Fountain County, IN, Fulton County, IN, Grant County, IN, Hamilton County, IN, Hancock County, IN, Hendricks County, IN, Henry County, IN, Howard County, IN, Huntington County, IN, Jay County, IN, Johnson County, IN, Kosciusko County, IN, Madison County, IN, Marion County, IN, Miami County, IN, Montgomery County, IN, Parke County, IN, Putnam County, IN, Randolph County, IN, Rush County, IN, Shelby County, IN, Tippecanoe County, IN, Tipton County, IN, Union County, IN, Wabash County, IN, Warren County, IN, Wayne County, IN, Wells County, IN, White County, IN, Whitley County, IN, Allen County, OH, Auglaize County, OH, Darke County, OH, Logan County, OH, Mercer County, OH, Miami County, OH, Montgomery County, OH, Paulding County, OH, Preble County, OH, Shelby County, OH, Van Wert County, OH

The radar

The Indianapolis radar (KIND), 68 km from the middle of the area, began a volume at 16:59 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, 4.9 hours before the alert went out and 204 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, 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, 3:02 PM ESTMesoscale DiscussionSPCAdams, Blackford, Boone, Carroll, Cass, Clinton and 15 more118 min
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

Nearby

Mesoscale Discussions in Indiana, 2004Mesoscale Discussions in Ohio, 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.