Alert archive / Kentucky / Severe Thunderstorm Watches in 2018
Severe Thunderstorm Watch 450
The Storm Prediction Center issued this severe thunderstorm watch at Dec 31, 2018, 1:48 PM EST for 13 counties in Indiana; 41 counties in Kentucky. It was in force for 3 hr.
The area
The outline as issued.
The facts
- Issued
- Dec 31, 2018, 1:48 PM EST (18:48 UTC)
- Expired
- Dec 31, 2018, 5:00 PM EST
- In force
- 3 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 0.5 in
- Strongest gust expected
- 60 kt
All 54 counties
Clark County, IN, Crawford County, IN, Dubois County, IN, Floyd County, IN, Harrison County, IN, Jefferson County, IN, Orange County, IN, Perry County, IN, Scott County, IN, Spencer County, IN, Vanderburgh County, IN, Warrick County, IN, Washington County, IN, Allen County, KY, Anderson County, KY, Barren County, KY, Breckinridge County, KY, Bullitt County, KY, Butler County, KY, Caldwell County, KY, Christian County, KY, Daviess County, KY, Edmonson County, KY, Franklin County, KY, Grayson County, KY, Green County, KY, Hancock County, KY, Hardin County, KY, Hart County, KY, Henderson County, KY, Henry County, KY, Hopkins County, KY, Jefferson County, KY, Larue County, KY, Logan County, KY, Marion County, KY, McLean County, KY, Meade County, KY, Metcalfe County, KY, Monroe County, KY, Muhlenberg County, KY, Nelson County, KY, Ohio County, KY, Oldham County, KY, Shelby County, KY, Simpson County, KY, Spencer County, KY, Taylor County, KY, Todd County, KY, Trigg County, KY, Trimble County, KY, Warren County, KY, Washington County, KY, Webster County, KY
The radar
The Louisville radar (KLVX), 46 km from the middle of the area, began a volume at 18:50 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.
What SPC expected
The probabilities SPC published with the watch, for the watch area over its life.
- Two or more tornadoes
- 20%
- One or more EF2 to EF5 tornadoes
- 5%
- Ten or more severe wind reports
- 30%
- One or more gusts of 65 knots or more
- 10%
- Ten or more severe hail reports
- 5%
- One or more hailstones of 2 inches or more
- 5%
- Six or more combined severe hail and wind reports
- 40%
Warnings issued inside it
13 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Dec 31, 1:49 PM EST | Severe Thunderstorm Warning | PAH | Christian, Todd | 41 min |
| Dec 31, 2:03 PM EST | Severe Thunderstorm Warning | PAH | Christian, Hopkins, Muhlenberg, Todd | 42 min |
| Dec 31, 2:33 PM EST | Severe Thunderstorm Warning | LMK | Butler, Logan, Ohio | 42 min |
| Dec 31, 3:01 PM EST | Severe Thunderstorm Warning | LMK | Perry | 29 min |
| Dec 31, 3:04 PM EST | Severe Thunderstorm Warning | LMK | Butler, Edmonson, Grayson, Warren | 26 min |
| Dec 31, 3:12 PM EST | Tornado Warning | LMK | Harrison | 33 min |
| Dec 31, 3:17 PM EST | Severe Thunderstorm Warning | LMK | Breckinridge, Grayson, Hardin | 28 min |
| Dec 31, 3:25 PM EST | Severe Thunderstorm Warning | LMK | Harrison | 35 min |
| Dec 31, 3:37 PM EST | Severe Thunderstorm Warning | LMK | Edmonson, Grayson, Hart, Larue | 23 min |
| Dec 31, 3:38 PM EST | Severe Thunderstorm Warning | LMK | Clark, Floyd, Harrison | 37 min |
| Dec 31, 3:47 PM EST | Severe Thunderstorm Warning | LMK | Bullitt, Jefferson, Spencer | 28 min |
| Dec 31, 3:52 PM EST | Severe Thunderstorm Warning | LMK | Allen, Barren, Metcalfe | 23 min |
| Dec 31, 3:58 PM EST | Severe Thunderstorm Warning | LMK | Green, Hart, Larue, Marion, Nelson, Taylor | 32 min |
Discussions around it
SPC mesoscale discussions over the same counties from four hours before the watch to its end.
The nearest sounding before it
Nashville Metro, TN (KBNA), launched 12:00Z, 6.8 hours before the alert went out and 179 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
- 470 m above ground
- 0-6 km bulk shear
- 58 kt
- 0-1 km storm-relative helicity
- 631 m²/s²
- 0-3 km storm-relative helicity
- 689 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.1
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Dec 31, 3:16 PM EST | Mesoscale Discussion | SPC | Clark, Crawford, Floyd, Harrison | 119 min |
| Dec 31, 12:22 PM EST | Mesoscale Discussion | SPC | Calloway, Christian, Graves, Marshall, Todd, Trigg | 83 min |
Nearby
Severe Thunderstorm Watches in Kentucky, 2018Severe Thunderstorm Watches in Indiana, 2018Every severe thunderstorm watch in 2018
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.