Alert archive / Illinois / Mesoscale Discussions in 2003
Mesoscale Discussion 785
The Storm Prediction Center issued this mesoscale discussion at May 6, 2003, 9:37 AM CDT for 21 counties in Illinois; 11 counties in Indiana. It was in force for 113 min.
The area
The outline as issued.
The facts
- Issued
- May 6, 2003, 9:37 AM CDT (14:37 UTC)
- Expired
- May 6, 2003, 11:30 AM CDT
- In force
- 113 min
- Issued by
- the Storm Prediction Center
All 32 counties
Bond County, IL, Clark 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, Hamilton County, IL, Jasper County, IL, Jefferson County, IL, Lawrence County, IL, Marion County, IL, Perry County, IL, Richland County, IL, Wabash County, IL, Washington County, IL, Wayne County, IL, White County, IL, Clay County, IN, Daviess County, IN, Dubois County, IN, Gibson County, IN, Greene County, IN, Knox County, IN, Martin County, IN, Owen County, IN, Pike County, IN, Sullivan County, IN, Vigo County, IN
The watches that followed
Watches SPC issued over any of the same counties within four hours of this discussion.
The nearest sounding before it
Nashville Metro, TN (KBNA), launched 12:00Z, 2.6 hours before the alert went out and 315 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.
- Mixed-layer CAPE
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 862 m above ground
- 0-6 km bulk shear
- 31 kt
- 0-1 km storm-relative helicity
- 122 m²/s²
- 0-3 km storm-relative helicity
- 102 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
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</html>SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 5, 10:58 PM CDT | Mesoscale Discussion | SPC | Alexander, Edwards, Franklin, Gallatin, Hamilton, Hardin and 9 more | 2 hr |
| May 6, 11:55 AM CDT | Severe Thunderstorm Watch | SPC | Bond, Clay, Clinton, Crawford, Edwards, Effingham and 21 more | 4 hr |
| May 6, 1:23 PM CDT | Mesoscale Discussion | SPC | Bond, Clay, Clinton, Crawford, Edwards, Effingham and 17 more | 2 hr |
| May 6, 5:08 PM CDT | Mesoscale Discussion | SPC | Bond, Calhoun, Clinton, Fayette, Jackson, Jefferson and 9 more | 2 hr |
| May 6, 5:33 PM CDT | Mesoscale Discussion | SPC | Bond, Calhoun, Clinton, Fayette, Jackson, Jefferson and 9 more | 117 min |
| May 6, 5:40 PM CDT | Tornado Watch | SPC | Alexander, Bond, Clay, Clinton, Crawford, Edwards and 28 more | 6 hr |
| May 6, 10:55 AM CDT | Mesoscale Discussion | SPC | Bartholomew, Brown, Clark, Crawford, Dearborn, Decatur and 23 more | 2 hr |
Nearby
Mesoscale Discussions in Illinois, 2003Mesoscale Discussions in Indiana, 2003Every 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.