Alert archive / Kentucky / Flash Flood Watches in 2020

Flash Flood Watch 3, NWS Jackson, KY

May 17, 202031 counties in Kentucky

NWS Jackson, KY issued this flash flood watch at May 17, 2020, 3:45 PM EDT for 31 counties in Kentucky. It took effect at May 18, 2020, 8:00 AM EDT. It was in force for 68 hr.

The area

The counties it named.

The facts

Issued: May 17, 2020, 3:45 PM EDT (19:45 UTC)
In effect from: May 18, 2020, 8:00 AM EDT
Expired: May 21, 2020, 4:12 AM EDT
In force: 68 hr
Issued by: NWS Jackson, KY
Flood severity: None

All 31 counties

Bath County, KY, Bell County, KY, Breathitt County, KY, Clay County, KY, Elliott County, KY, Estill County, KY, Fleming County, KY, Floyd County, KY, Harlan County, KY, Jackson County, KY, Johnson County, KY, Knott County, KY, Knox County, KY, Laurel County, KY, Lee County, KY, Leslie County, KY, Magoffin County, KY, Martin County, KY, McCreary County, KY, Menifee County, KY, Montgomery County, KY, Morgan County, KY, Owsley County, KY, Perry County, KY, Powell County, KY, Pulaski County, KY, Rockcastle County, KY, Rowan County, KY, Wayne County, KY, Whitley County, KY, Wolfe County, KY

The radar

The Jackson,KY radar (KJKL), 30 km from the middle of the area, began a volume at 19:46 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, 7.8 hours before the alert went out and 217 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 Jackson, KY wrote its last area forecast discussion before this flash flood watch went out at May 17, 3:03 PM EDT, 42 minutes earlier.

Area forecast discussion, May 17, 3:03 PM EDT, 42 minutes before

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Hazardous weather outlook, May 17, 4:43 AM EDT, 11 hours 2 minutes before

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Nearby

Flash Flood Watches in Kentucky, 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.