Alert archive / Indiana / Mesoscale Discussions in 2004

Mesoscale Discussion 1497

July 4, 200428 counties in Illinois; 33 counties in Indiana; 22 counties in Kentucky

The Storm Prediction Center issued this mesoscale discussion at Jul 4, 2004, 11:24 AM CDT for 28 counties in Illinois; 33 counties in Indiana; 22 counties in Kentucky. It was in force for 3 hr.

The area

The outline as issued.

The facts

Issued: Jul 4, 2004, 11:24 AM CDT (16:24 UTC)
Expired: Jul 4, 2004, 2:00 PM CDT
In force: 3 hr
Issued by: the Storm Prediction Center

All 83 counties

Bond County, IL, Clay County, IL, Clinton County, IL, Crawford County, IL, Cumberland County, IL, Edwards County, IL, Effingham County, IL, Fayette County, IL, Franklin County, IL, Gallatin County, IL, Hamilton County, IL, Hardin County, IL, Jackson County, IL, Jasper County, IL, Jefferson County, IL, Johnson County, IL, Lawrence County, IL, Marion County, IL, Perry County, IL, Pope County, IL, Randolph County, IL, Richland County, IL, Saline County, IL, Wabash County, IL, Washington County, IL, Wayne County, IL, White County, IL, Williamson County, IL, Bartholomew County, IN, Brown County, IN, Clark County, IN, Crawford County, IN, Daviess County, IN, Dearborn County, IN, Decatur County, IN, Dubois County, IN, Floyd County, IN, Franklin County, IN, Gibson County, IN, Greene County, IN, Harrison County, IN, Jackson County, IN, Jefferson County, IN, Jennings County, IN, Knox County, IN, Lawrence County, IN, Martin County, IN, Monroe County, IN, Ohio County, IN, Orange County, IN, Perry County, IN, Pike County, IN, Posey County, IN, Ripley County, IN, Scott County, IN, Spencer County, IN, Sullivan County, IN, Switzerland County, IN, Vanderburgh County, IN, Warrick County, IN, Washington County, IN, Boone County, KY, Breckinridge County, KY, Bullitt County, KY, Carroll County, KY, Crittenden County, KY, Daviess County, KY, Gallatin County, KY, Grant County, KY, Hancock County, KY, Henderson County, KY, Henry County, KY, Hopkins County, KY, Jefferson County, KY, McLean County, KY, Meade County, KY, Ohio County, KY, Oldham County, KY, Owen County, KY, Shelby County, KY, Trimble County, KY, Union County, KY, Webster County, KY

The watches that followed

Watches SPC issued over any of the same counties within four hours of this discussion.

The nearest sounding before it

Lincoln, IL (KILX), launched 12:00Z, 4.4 hours before the alert went out and 187 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: 825 m above ground
0-6 km bulk shear: 19 kt
0-1 km storm-relative helicity: 135 m²/s²
0-3 km storm-relative helicity: 139 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
Jul 4, 11:35 AM CDT	Severe Thunderstorm Watch	SPC	Alexander, Massac, Pulaski	4 hr
Jul 4, 1:05 PM CDT	Severe Thunderstorm Watch	SPC	Bond, Clay, Clinton, Crawford, Cumberland, Edwards and 19 more	6 hr
Jul 4, 3:04 PM CDT	Mesoscale Discussion	SPC	Clay, Edwards, Gallatin, Hamilton, Lawrence, Richland and 3 more	116 min
Jul 4, 10:38 AM CDT	Mesoscale Discussion	SPC	Fulton	2 hr
Jul 4, 3:25 PM CDT	Severe Thunderstorm Watch	SPC	Allen, Barren, Clinton, Cumberland, Logan, Metcalfe and 5 more	6 hr

Nearby

Mesoscale Discussions in Indiana, 2004 Mesoscale Discussions in Illinois, 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.