Alert archive / Kentucky / Flash Flood Watches in 2021

Flash Flood Watch 4, NWS Jackson, KY

June 30, 202133 counties in Kentucky

NWS Jackson, KY issued this flash flood watch at Jun 30, 2021, 4:10 PM EDT for 33 counties in Kentucky. It took effect at Jul 1, 2021, 6:00 AM EDT. It was in force for 21 hr.

The area

The counties it named.

The facts

Issued: Jun 30, 2021, 4:10 PM EDT (20:10 UTC)
In effect from: Jul 1, 2021, 6:00 AM EDT
Expired: Jul 2, 2021, 3:11 AM EDT
In force: 21 hr
Issued by: NWS Jackson, KY
Flood severity: None

All 33 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, Letcher 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, Pike 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), 26 km from the middle of the area, began a volume at 20:09 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, 8.2 hours before the alert went out and 218 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: 608 J/kg
Mixed-layer CIN: -78 J/kg
Mixed-layer LCL: 1164 m above ground
0-6 km bulk shear: 20 kt
0-1 km storm-relative helicity: -4 m²/s²
0-3 km storm-relative helicity: -19 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 Jun 30, 2:41 PM EDT, 1 hour 29 minutes earlier.

Area forecast discussion, Jun 30, 2:41 PM EDT, 1 hour 29 minutes before

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Hazardous weather outlook, Jun 30, 5:40 AM EDT, 10 hours 30 minutes before

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In the hours before

Special weather statement, Jun 30, 3:56 PM EDT, 14 minutes before

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The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 29, 10:51 PM EDT	Areal Flood Advisory	JKL	Pulaski	3 hr
Jun 29, 11:27 PM EDT	Areal Flood Advisory	JKL	Pulaski	93 min
Jun 30, 3:56 PM EDT	Special Weather Statement	JKL	Martin	34 min

Nearby

Flash Flood Watches in Kentucky, 2021 Every flash flood watch 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.