Alert archive / Kentucky / Flash Flood Watches in 2020

Flash Flood Watch 5, NWS Louisville, KY

May 17, 202028 counties in Kentucky; 6 counties in Indiana

NWS Louisville, KY issued this flash flood watch at May 17, 2020, 3:03 PM EDT for 28 counties in Kentucky; 6 counties in Indiana. It took effect at May 18, 2020, 8:00 AM EDT. It was in force for 43 hr.

The area

The counties it named.

The facts

Issued: May 17, 2020, 3:03 PM EDT (19:03 UTC)
In effect from: May 18, 2020, 8:00 AM EDT
Expired: May 20, 2020, 3:18 AM EDT
In force: 43 hr
Issued by: NWS Louisville, KY
Flood severity: None

All 34 counties

Clark County, IN, Floyd County, IN, Harrison County, IN, Jefferson County, IN, Scott County, IN, Washington County, IN, Anderson County, KY, Bourbon County, KY, Boyle County, KY, Bullitt County, KY, Casey County, KY, Clark County, KY, Clinton County, KY, Fayette County, KY, Franklin County, KY, Garrard County, KY, Harrison County, KY, Henry County, KY, Jefferson County, KY, Jessamine County, KY, Lincoln County, KY, Madison County, KY, Marion County, KY, Mercer County, KY, Nelson County, KY, Nicholas County, KY, Oldham County, KY, Russell 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), 78 km from the middle of the area, began a volume at 19:05 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

Cncnati-Daytn, OH (KILN), launched 12:00Z, 7.1 hours before the alert went out and 191 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 2 J/kg
Mixed-layer CIN: -141 J/kg
Mixed-layer LCL: 1426 m above ground
0-6 km bulk shear: 32 kt
0-1 km storm-relative helicity: 139 m²/s²
0-3 km storm-relative helicity: 152 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this flash flood watch 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 flash flood watch went out at May 17, 3:00 PM EDT, 3 minutes earlier.

Area forecast discussion, May 17, 3:00 PM EDT, 3 minutes before

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Hazardous weather outlook, May 17, 9:54 AM EDT, 5 hours 9 minutes before

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The office that day

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

Issued	Product	Office	Counties	Lasted
May 17, 4:05 PM EDT	Special Weather Statement	LMK	Butler	25 min
May 16, 8:03 PM EDT	Areal Flood Advisory	LMK	Perry	3 hr

Nearby

Flash Flood Watches in Kentucky, 2020 Flash Flood Watches in Indiana, 2020 Every flash flood watch in 2020

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.