Alert archive / Kentucky / Flash Flood Watches in 2018

Flash Flood Watch 8, NWS Jackson, KY

September 22, 201831 counties in Kentucky

NWS Jackson, KY issued this flash flood watch at Sep 22, 2018, 2:50 PM EDT for 31 counties in Kentucky. It took effect at Sep 22, 2018, 10:00 PM EDT. It was in force for 4 days.

The area

The counties it named.

The facts

Issued: Sep 22, 2018, 2:50 PM EDT (18:50 UTC)
In effect from: Sep 22, 2018, 10:00 PM EDT
Expired: Sep 26, 2018, 11:36 AM EDT
In force: 4 days
Issued by: NWS Jackson, KY
Flood severity: None

All 31 counties

Bath County, KY, Breathitt County, KY, Clay County, KY, Elliott County, KY, Estill County, KY, Fleming County, KY, Floyd 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), 24 km from the middle of the area, began a volume at 18:50 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, 6.8 hours before the alert went out and 311 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: 197 J/kg
Mixed-layer CIN: -77 J/kg
Mixed-layer LCL: 794 m above ground
0-6 km bulk shear: 26 kt
0-1 km storm-relative helicity: 58 m²/s²
0-3 km storm-relative helicity: 80 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 Sep 22, 1:50 PM EDT, 1 hour earlier.

Area forecast discussion, Sep 22, 1:50 PM EDT, 1 hour before

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Hazardous weather outlook, Sep 22, 5:02 AM EDT, 9 hours 48 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
Sep 22, 3:55 PM EDT	Areal Flood Advisory	JKL	Laurel, McCreary, Pulaski, Wayne, Whitley	2 hr
Sep 22, 4:23 PM EDT	Flash Flood Warning	JKL	McCreary, Whitley	3 hr
Sep 22, 4:59 PM EDT	Special Weather Statement	JKL	Whitley	46 min
Sep 22, 5:00 PM EDT	Special Weather Statement	JKL	Bell, Knox	45 min
Sep 22, 5:44 PM EDT	Special Weather Statement	JKL	Bell	61 min
Sep 22, 5:57 PM EDT	Special Weather Statement	JKL	Bell	63 min
Sep 22, 7:31 PM EDT	Special Weather Statement	JKL	Harlan	44 min

Nearby

Flash Flood Watches in Kentucky, 2018 Every flash flood watch in 2018

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.