Alert archive / Kentucky / Mesoscale Discussions in 2015
Mesoscale Discussion 1497
The Storm Prediction Center issued this mesoscale discussion at Jul 20, 2015, 6:23 PM CDT for 6 states. It was in force for 97 min.
The area
The outline as issued.
The facts
- Issued
- Jul 20, 2015, 6:23 PM CDT (23:23 UTC)
- Expired
- Jul 20, 2015, 8:00 PM CDT
- In force
- 97 min
- Issued by
- the Storm Prediction Center
- Chance of a watch
- 80%
All 59 counties
Clay County, AR, Randolph County, AR, Alexander County, IL, Franklin County, IL, Gallatin County, IL, Hamilton County, IL, Hardin County, IL, Jackson County, IL, Johnson County, IL, Massac County, IL, Pope County, IL, Pulaski County, IL, Saline County, IL, Union County, IL, White County, IL, Williamson County, IL, Posey County, IN, Vanderburgh County, IN, Ballard County, KY, Caldwell County, KY, Calloway County, KY, Carlisle County, KY, Christian County, KY, Crittenden County, KY, Daviess County, KY, Fulton County, KY, Graves County, KY, Henderson County, KY, Hickman 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, Bollinger County, MO, Butler County, MO, Cape Girardeau County, MO, Carter County, MO, Howell County, MO, Madison County, MO, Mississippi County, MO, New Madrid County, MO, Oregon County, MO, Pemiscot County, MO, Perry County, MO, Reynolds County, MO, Ripley County, MO, Scott County, MO, Shannon County, MO, Stoddard County, MO, Wayne County, MO, Henry County, TN, Lake County, TN, Obion County, TN, Weakley County, TN
The radar
The Paducah radar (KPAH), 63 km from the middle of the area, began a volume at 23:23 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
Little Rock, AR (KBYH), launched 12:00Z, 11.4 hours before the alert went out and 255 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
- 117 J/kg
- Mixed-layer CIN
- -259 J/kg
- Mixed-layer LCL
- 1760 m above ground
- 0-6 km bulk shear
- 16 kt
- 0-1 km storm-relative helicity
- 29 m²/s²
- 0-3 km storm-relative helicity
- 21 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.1
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 |
|---|---|---|---|---|
| Jul 20, 6:42 PM CDT | Severe Thunderstorm Watch | SPC | Clay, Craighead, Greene, Lawrence, Randolph | 5 hr |
| Jul 19, 7:47 PM CDT | Mesoscale Discussion | SPC | Alexander, Jackson, Johnson, Monroe, Perry, Pulaski and 2 more | 118 min |
| Jul 20, 1:05 PM CDT | Mesoscale Discussion | SPC | Adair, Bell, Breathitt, Casey, Clay, Clinton and 25 more | 85 min |
| Jul 20, 3:50 PM CDT | Mesoscale Discussion | SPC | Barry, Barton, Bates, Benton, Bollinger, Butler and 42 more | 115 min |
Nearby
Mesoscale Discussions in Kentucky, 2015Mesoscale Discussions in Missouri, 2015Mesoscale Discussions in Illinois, 2015Every mesoscale discussion in 2015
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.