Alert archive / Kentucky / Dense Fog Advisories in 2021

Dense Fog Advisory 2, NWS Louisville, KY

January 26, 202126 counties in Kentucky; 10 counties in Indiana

NWS Louisville, KY issued this dense fog advisory at Jan 26, 2021, 3:41 AM EST for 26 counties in Kentucky; 10 counties in Indiana. It was in force for 3 hr.

The area

The counties it named.

The facts

Issued
Jan 26, 2021, 3:41 AM EST (08:41 UTC)
Expired
Jan 26, 2021, 6:11 AM EST
In force
3 hr
Issued by
NWS Louisville, KY
All 36 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, Anderson County, KY, Bourbon County, KY, Breckinridge County, KY, Bullitt County, KY, Fayette County, KY, Franklin County, KY, Grayson County, KY, Hancock County, KY, Hardin County, KY, Harrison County, KY, Henry County, KY, Jefferson County, KY, Jessamine County, KY, Larue County, KY, Meade County, KY, Mercer County, KY, Nelson County, KY, Nicholas County, KY, Ohio County, KY, Oldham County, KY, Scott County, KY, Shelby County, KY, Spencer County, KY, Trimble County, KY, Washington County, KY, Woodford County, KY

The radar

The Louisville radar (KLVX), 39 km from the middle of the area, began a volume at 08:45 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, 8.7 hours before the alert went out and 241 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.

Skew-T log-pSkew-T log-p diagram, Nashville Metro, TN at 00:00Z on 2021-01-26Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Nashville Metro, TN at 00:00Z on 2021-01-26The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 654 square meters per square second.1939587897117Sfc1 km3 km6 km9 kmRMLM
The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.
Mixed-layer CAPE
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
548 m above ground
0-6 km bulk shear
66 kt
0-1 km storm-relative helicity
654 m²/s²
0-3 km storm-relative helicity
735 m²/s²
Significant tornado parameter
0.0
Supercell composite
2.2

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this dense fog advisory went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Louisville, KY wrote its last area forecast discussion before this dense fog advisory went out at Jan 26, 3:30 AM EST, 11 minutes earlier.

Area forecast discussion, Jan 26, 3:30 AM EST, 11 minutes before
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Hazardous weather outlook, Jan 25, 4:04 PM EST, 11 hours 37 minutes before
Hazardous Weather Outlook
National Weather Service Louisville KY
404 PM EST Mon Jan 25 2021

INZ076>079-083-084-089>092-KYZ023>043-045>049-053>057-061>067-
070>078-081-082-262115-
Orange-Washington-Scott-Jefferson-Dubois-Crawford-Perry-Harrison-
Floyd-Clark-Hancock-Breckinridge-Meade-Ohio-Grayson-Hardin-Bullitt-
Oldham-Trimble-Henry-Shelby-Franklin-Spencer-Anderson-Woodford-
Fayette-Bourbon-Nicholas-Nelson-Mercer-Jessamine-Larue-Marion-Boyle-
Garrard-Madison-Butler-Edmonson-Hart-Green-Taylor-Casey-Lincoln-
Logan-Warren-Simpson-Allen-Barren-Monroe-Metcalfe-Adair-Russell-
Cumberland-Clinton-
Including the cities of Paoli, Salem, Scottsburg, Madison, Jasper,
English, Tell City, Corydon, New Albany, Jeffersonville, Lewisport,
Hawesville, Hardinsburg, Brandenburg, Hartford, Leitchfield,
Elizabethtown, Shepherdsville, Louisville, La Grange, Bedford,
Milton, New Castle, Shelbyville, Frankfort, Georgetown, Cynthiana,
Taylorsville, Lawrenceburg, Versailles, Lexington, Paris, Carlisle,
Bardstown, Springfield, Harrodsburg, Nicholasville, Winchester,
Hodgenville, Lebanon, Danville, Lancaster, Richmond, Morgantown,
Brownsville, Horse Cave, Greensburg, Campbellsville, Liberty,
Stanford, Russellville, Bowling Green, Franklin, Providence,
Scottsville, Glasgow, Tompkinsville, Edmonton, Columbia, Jamestown,
Burkesville, and Albany
404 PM EST Mon Jan 25 2021 /304 PM CST Mon Jan 25 2021/

This hazardous weather outlook is for portions of south central
Indiana and Central Kentucky.

.DAY ONE...Tonight.

Widespread soaking rainfall will continue until early evening, with
localized heavy rainfall possible later in the evening. Minor
flooding of low-lying areas will be possible where heavy rain falls
repeatedly. The best chance of flooding or ponding will be south of
the Western Kentucky and Bluegrass Parkways.

.DAYS TWO THROUGH SEVEN...Tuesday through Sunday.

Minor snow accumulations are possible Wednesday afternoon into
Wednesday night, mainly across southern Indiana and north central
Kentucky.

.SPOTTER INFORMATION STATEMENT...

Spotters are encouraged to report any observed flooding through
tonight.

&&

More information, along with other weather, hydrological and
climate information can be found, at weather.gov/louisville.

RAS

In the hours before

Special weather statement, Jan 25, 9:41 PM EST, 6 hours before
Special Weather Statement
National Weather Service Louisville KY
941 PM EST Mon Jan 25 2021

KYZ046-047-260315-
Mercer-Washington-
941 PM EST Mon Jan 25 2021

...A STRONG THUNDERSTORM WILL AFFECT MERCER AND WASHINGTON
COUNTIES...

At 940 PM EST, a strong thunderstorm was located near Springfield,
moving northeast at 65 mph.

Half inch hail is possible with this storm.

Locations impacted include...
Harrodsburg, Burgin, Mackville, Oregon, Shakertown, Vanarsdell,
Ebenezer, Rineltown, Talmage, and Cornishville.

If outdoors, seek shelter inside a building.

LAT...LON 3777 8471 3768 8497 3768 8502 3766 8503
      3763 8512 3763 8516 3771 8521 3794 8480
      3789 8480 3790 8478 3791 8478 3790 8477
      3789 8478 3787 8476 3785 8477 3786 8472
      3785 8470 3783 8473
TIME...MOT...LOC 0240Z 239DEG 56KT 3768 8512

13
Special weather statement, Jan 25, 11:43 PM EST, 3 hours 58 minutes before
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The office that day

Everything else NWS Louisville, KY issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Jan 25, 7:10 PM ESTAreal Flood AdvisoryLMKEdmonson, Hart5 hr
Jan 25, 7:46 PM ESTRiver Flood AdvisoryLMKBourbon112 min
Jan 25, 8:09 PM ESTAreal Flood AdvisoryLMKCasey, Green, Taylor4 hr
Jan 25, 8:11 PM ESTSpecial Weather StatementLMKAllen19 min
Jan 25, 8:17 PM ESTSevere Thunderstorm WarningLMKAllen, Barren, Monroe30 min
Jan 25, 8:39 PM ESTAreal Flood AdvisoryLMKAdair, Barren, Casey, Cumberland, Green, Metcalfe and 1 more4 hr
Jan 25, 8:39 PM ESTRiver Flood WarningLMKButler, Warren4 days
Jan 25, 8:47 PM ESTSpecial Weather StatementLMKMetcalfe28 min
Jan 25, 8:50 PM ESTAreal Flood AdvisoryLMKGarrard, Lincoln, Madison4 hr
Jan 25, 9:17 PM ESTSpecial Weather StatementLMKMarion28 min
Jan 25, 9:35 PM ESTSpecial Weather StatementLMKClinton40 min
Jan 25, 9:38 PM ESTRiver Flood WarningLMKBourbon25 hr
Jan 25, 9:41 PM ESTSpecial Weather StatementLMKMercer34 min
Jan 25, 9:56 PM ESTRiver Flood WarningLMKOhio44 hr
Jan 25, 10:03 PM ESTRiver Flood AdvisoryLMKHart15 hr
Jan 25, 10:12 PM ESTRiver Flood AdvisoryLMKWarren18 hr
Jan 25, 10:21 PM ESTRiver Flood AdvisoryLMKFranklin25 hr
Jan 25, 10:38 PM ESTRiver Flood WarningLMKButler, Muhlenberg, Ohio4 days
Jan 26, 11:55 AM ESTRiver Flood AdvisoryLMKHardin, Nelson9 hr
Jan 26, 1:05 PM ESTRiver Flood WarningLMKHart31 hr
Jan 26, 2:59 PM ESTWinter Weather AdvisoryLMKAdair, Allen, Anderson, Barren, Bourbon, Boyle and 43 more33 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.