Alert archive / Indiana / Mesoscale Discussions in 2003

Mesoscale Discussion 380

April 4, 2003Clark County, Illinois; 51 counties in Indiana; Darke County, Mercer County, Preble County, Ohio

The Storm Prediction Center issued this mesoscale discussion at Apr 4, 2003, 6:01 PM CST for Clark County, Illinois; 51 counties in Indiana; Darke County, Mercer County, Preble County, Ohio. It was in force for 59 min.

The area

The outline as issued.

The facts

Issued: Apr 4, 2003, 6:01 PM CST (00:01 UTC)
Expired: Apr 4, 2003, 7:00 PM CST
In force: 59 min
Issued by: the Storm Prediction Center

All 55 counties

Clark County, IL, Adams County, IN, Bartholomew County, IN, Blackford County, IN, Boone County, IN, Brown County, IN, Carroll County, IN, Cass County, IN, Clay County, IN, Clinton County, IN, Decatur County, IN, Delaware County, IN, Fayette County, IN, Fountain County, IN, Franklin County, IN, Grant County, IN, Greene County, IN, Hamilton County, IN, Hancock County, IN, Hendricks County, IN, Henry County, IN, Howard County, IN, Huntington County, IN, Jackson County, IN, Jay County, IN, Jennings County, IN, Johnson County, IN, Lawrence County, IN, Madison County, IN, Marion County, IN, Martin County, IN, Miami County, IN, Monroe County, IN, Montgomery County, IN, Morgan County, IN, Owen County, IN, Parke County, IN, Putnam County, IN, Randolph County, IN, Ripley County, IN, Rush County, IN, Scott County, IN, Shelby County, IN, Sullivan County, IN, Tippecanoe County, IN, Tipton County, IN, Union County, IN, Vermillion County, IN, Vigo County, IN, Wabash County, IN, Wayne County, IN, Wells County, IN, Darke County, OH, Mercer County, OH, Preble County, OH

The radar

The Indianapolis radar (KIND), 21 km from the middle of the area, began a volume at 00:02 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 00:00Z, 0.0 hours before the alert went out and 207 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: 628 J/kg
Mixed-layer CIN: -3 J/kg
Mixed-layer LCL: 1237 m above ground
0-6 km bulk shear: 40 kt
0-1 km storm-relative helicity: 160 m²/s²
0-3 km storm-relative helicity: 223 m²/s²
Significant tornado parameter: 0.4
Supercell composite: 4.2

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 4, 6:30 PM CST	Tornado Watch	SPC	Clark, Coles, Crawford, Cumberland, Edgar, Effingham and 2 more	6 hr
Apr 4, 7:07 PM CST	Mesoscale Discussion	SPC	Alexander, Clay, Edwards, Franklin, Gallatin, Hamilton and 18 more	83 min
Apr 4, 9:00 PM CST	Mesoscale Discussion	SPC	Bartholomew, Clark, Crawford, Dearborn, Decatur, Dubois and 18 more	90 min
Apr 4, 9:20 PM CST	Tornado Watch	SPC	Bartholomew, Clark, Crawford, Dearborn, Decatur, Dubois and 21 more	5 hr
Apr 4, 10:38 PM CST	Mesoscale Discussion	SPC	Switzerland	97 min
Apr 4, 11:05 PM CST	Severe Thunderstorm Watch	SPC	Adams, Athens, Belmont, Brown, Carroll, Columbiana and 27 more	5 hr
Apr 5, 1:34 AM CST	Mesoscale Discussion	SPC	Adams, Athens, Belmont, Brown, Carroll, Columbiana and 28 more	86 min

Nearby

Mesoscale Discussions in Indiana, 2003 Mesoscale Discussions in Ohio, 2003 Mesoscale Discussions in Illinois, 2003 Every mesoscale discussion in 2003

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.