Alert archive / Kentucky / Dense Fog Advisories in 2021
Dense Fog Advisory 8, NWS Louisville, KY
NWS Louisville, KY issued this dense fog advisory at Aug 19, 2021, 2:36 PM CDT for 49 counties in Kentucky; 10 counties in Indiana. It took effect at Aug 19, 2021, 11:00 PM CDT. It was in force for 10 hr.
The area
The counties it named.
The facts
- Issued
- Aug 19, 2021, 2:36 PM CDT (19:36 UTC)
- In effect from
- Aug 19, 2021, 11:00 PM CDT
- Expired
- Aug 20, 2021, 8:52 AM CDT
- In force
- 10 hr
- Issued by
- NWS Louisville, KY
All 59 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, Washington County, IN, Adair County, KY, Allen County, KY, Anderson County, KY, Barren County, KY, Bourbon County, KY, Boyle County, KY, Breckinridge County, KY, Bullitt County, KY, Butler County, KY, Casey County, KY, Clark County, KY, Clinton County, KY, Cumberland County, KY, Edmonson County, KY, Fayette County, KY, Franklin County, KY, Garrard County, KY, Grayson County, KY, Green County, KY, Hancock County, KY, Hardin County, KY, Harrison County, KY, Hart County, KY, Henry County, KY, Jefferson County, KY, Jessamine County, KY, Larue County, KY, Lincoln County, KY, Logan County, KY, Madison County, KY, Marion County, KY, Meade County, KY, Mercer County, KY, Metcalfe County, KY, Monroe County, KY, Nelson County, KY, Nicholas County, KY, Ohio County, KY, Oldham County, KY, Russell County, KY, Scott County, KY, Shelby County, KY, Simpson County, KY, Spencer County, KY, Taylor County, KY, Trimble County, KY, Warren County, KY, Washington County, KY, Woodford County, KY
The radar
The Louisville radar (KLVX), 43 km from the middle of the area, began a volume at 19:36 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 12:00Z, 7.6 hours before the alert went out and 205 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
- 455 J/kg
- Mixed-layer CIN
- -72 J/kg
- Mixed-layer LCL
- 709 m above ground
- 0-6 km bulk shear
- 27 kt
- 0-1 km storm-relative helicity
- 87 m²/s²
- 0-3 km storm-relative helicity
- 132 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.5
The office that day
Everything else NWS Louisville, KY issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 18, 7:37 PM CDT | Areal Flood Advisory | LMK | Ohio | 113 min |
| Aug 19, 4:25 AM CDT | Areal Flood Advisory | LMK | Hancock | 3 hr |
| Aug 19, 5:46 AM CDT | Areal Flood Advisory | LMK | Spencer | 3 hr |
| Aug 19, 5:48 AM CDT | Areal Flood Advisory | LMK | Bullitt | 3 hr |
| Aug 19, 6:00 AM CDT | Areal Flood Advisory | LMK | Anderson, Franklin, Woodford | 3 hr |
| Aug 19, 6:09 AM CDT | Flash Flood Warning | LMK | Anderson, Franklin | 3 hr |
| Aug 19, 6:22 AM CDT | Areal Flood Advisory | LMK | Bullitt, Jefferson, Shelby, Spencer | 3 hr |
| Aug 19, 6:58 AM CDT | Areal Flood Advisory | LMK | Anderson, Bullitt, Nelson, Shelby, Spencer | 2 hr |
| Aug 19, 7:26 AM CDT | Areal Flood Advisory | LMK | Anderson, Franklin, Henry, Shelby | 2 hr |
| Aug 19, 8:06 AM CDT | Areal Flood Advisory | LMK | Anderson, Marion, Nelson, Washington, Woodford | 114 min |
| Aug 19, 4:42 AM CDT | Areal Flood Advisory | LMK | Clark, Floyd | 3 hr |
Nearby
Dense Fog Advisories in Kentucky, 2021Dense Fog Advisories in Indiana, 2021Every dense fog advisory in 2021
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.