Alert archive / Kentucky / Mesoscale Discussions in 2012
Mesoscale Discussion 1857
The Storm Prediction Center issued this mesoscale discussion at Sep 1, 2012, 7:56 PM CDT for 4 states. It was in force for 94 min.
The area
The outline as issued.
The facts
- Issued
- Sep 1, 2012, 7:56 PM CDT (00:56 UTC)
- Expired
- Sep 1, 2012, 9:30 PM CDT
- In force
- 94 min
- Issued by
- the Storm Prediction Center
All 26 counties
Gallatin County, IL, Hardin County, IL, Massac County, IL, Pope County, IL, White County, IL, Gibson County, IN, Posey County, IN, Vanderburgh County, IN, Warrick County, IN, Caldwell County, KY, Calloway County, KY, Crittenden County, KY, Graves County, KY, Henderson County, KY, Hopkins County, KY, Livingston County, KY, Lyon County, KY, Marshall County, KY, McCracken County, KY, McLean County, KY, Trigg County, KY, Union County, KY, Webster County, KY, Carroll County, TN, Henry County, TN, Weakley County, TN
The radar
The Paducah radar (KPAH), 45 km from the middle of the area, began a volume at 00:59 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 nearest sounding before it
Nashville Metro, TN (KBNA), launched 00:00Z, 0.9 hours before the alert went out and 181 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
- 1909 J/kg
- Mixed-layer CIN
- -16 J/kg
- Mixed-layer LCL
- 1040 m above ground
- 0-6 km bulk shear
- 30 kt
- 0-1 km storm-relative helicity
- 127 m²/s²
- 0-3 km storm-relative helicity
- 160 m²/s²
- Significant tornado parameter
- 0.9
- Supercell composite
- 5.5
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 |
|---|---|---|---|---|
| Sep 1, 7:13 PM CDT | Mesoscale Discussion | SPC | Champaign, Clark, Edgar, Vermilion | 62 min |
| Sep 1, 9:37 PM CDT | Mesoscale Discussion | SPC | Vanderburgh, Warrick | 23 min |
| Sep 2, 2:20 PM CDT | Mesoscale Discussion | SPC | Adair, Allen, Barren, Boyle, Casey, Clinton and 15 more | 115 min |
| Sep 2, 2:49 PM CDT | Tornado Watch | SPC | Adair, Allen, Anderson, Barren, Bath, Bourbon and 37 more | 7 hr |
| Sep 2, 6:35 PM CDT | Mesoscale Discussion | SPC | Adair, Allen, Anderson, Barren, Bath, Bourbon and 34 more | 85 min |
| Sep 1, 7:08 PM CDT | Severe Thunderstorm Watch | SPC | Carroll, Chester, Decatur, Fayette, Hardeman, Hardin and 4 more | 6 hr |
| Sep 1, 9:59 PM CDT | Mesoscale Discussion | SPC | Chester, Decatur, Hardeman, Henderson, McNairy | 91 min |
| Sep 2, 3:42 PM CDT | Tornado Watch | SPC | Chester, Decatur, Fayette, Hardeman, Hardin, McNairy and 1 more | 7 hr |
| Sep 2, 5:13 PM CDT | Mesoscale Discussion | SPC | Bradley, Hamilton, Loudon, McMinn, Meigs, Monroe and 2 more | 62 min |
| Sep 2, 5:33 PM CDT | Severe Thunderstorm Watch | SPC | Bradley, Hamilton, McMinn, Meigs, Monroe, Polk and 1 more | 5 hr |
Nearby
Mesoscale Discussions in Kentucky, 2012Mesoscale Discussions in Illinois, 2012Mesoscale Discussions in Indiana, 2012Every mesoscale discussion in 2012
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.