Alert archive / Kentucky / Flash Flood Watches in 2018

Flash Flood Watch 9, NWS Louisville, KY

September 6, 201815 counties in Kentucky; 10 counties in Indiana

NWS Louisville, KY issued this flash flood watch at Sep 6, 2018, 3:40 PM EDT for 15 counties in Kentucky; 10 counties in Indiana. It took effect at Sep 8, 2018, 8:00 AM EDT. It was in force for 36 hr.

The area

The counties it named.

The facts

Issued: Sep 6, 2018, 3:40 PM EDT (19:40 UTC)
In effect from: Sep 8, 2018, 8:00 AM EDT
Expired: Sep 9, 2018, 8:00 PM EDT
In force: 36 hr
Issued by: NWS Louisville, KY
Flood severity: None

All 25 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, Bourbon County, KY, Clark County, KY, Fayette County, KY, Franklin County, KY, Harrison County, KY, Henry County, KY, Jefferson County, KY, Jessamine County, KY, Madison County, KY, Nicholas County, KY, Oldham County, KY, Scott County, KY, Shelby County, KY, Trimble County, KY, Woodford County, KY

The radar

The Louisville radar (KLVX), 67 km from the middle of the area, began a volume at 19:39 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, 7.7 hours before the alert went out and 181 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: 910 J/kg
Mixed-layer CIN: -41 J/kg
Mixed-layer LCL: 933 m above ground
0-6 km bulk shear: 22 kt
0-1 km storm-relative helicity: -17 m²/s²
0-3 km storm-relative helicity: 42 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.7

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 Sep 6, 3:26 PM EDT, 14 minutes earlier.

Area forecast discussion, Sep 6, 3:26 PM EDT, 14 minutes before

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Hazardous weather outlook, Sep 6, 3:33 PM EDT, 7 minutes before

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In the hours before

Special weather statement, Sep 6, 12:03 PM EDT, 3 hours 37 minutes before

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Special weather statement, Sep 6, 12:57 PM EDT, 2 hours 43 minutes before

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Special weather statement, Sep 6, 1:48 PM EDT, 1 hour 52 minutes before

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Local storm report, Sep 6, 2:33 PM EDT, 1 hour 7 minutes before

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Special weather statement, Sep 6, 2:39 PM EDT, 1 hour 1 minute before

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Special weather statement, Sep 6, 3:35 PM EDT, 5 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
Sep 6, 12:57 PM EDT	Special Weather Statement	LMK	Nelson	33 min
Sep 6, 1:48 PM EDT	Special Weather Statement	LMK	Butler	27 min
Sep 6, 2:39 PM EDT	Special Weather Statement	LMK	Edmonson, Hart, Ohio	36 min
Sep 6, 3:35 PM EDT	Special Weather Statement	LMK	Clinton	25 min
Sep 6, 4:21 PM EDT	Special Weather Statement	LMK	Allen, Warren	39 min
Sep 6, 4:47 PM EDT	Special Weather Statement	LMK	Woodford	28 min
Sep 6, 5:02 PM EDT	Special Weather Statement	LMK	Allen, Warren	43 min
Sep 6, 5:18 PM EDT	Special Weather Statement	LMK	Franklin	42 min
Sep 6, 5:22 PM EDT	Special Weather Statement	LMK	Monroe	38 min
Sep 6, 5:46 PM EDT	Special Weather Statement	LMK	Clark	29 min
Sep 6, 5:49 PM EDT	Special Weather Statement	LMK	Franklin	26 min
Sep 6, 6:19 PM EDT	Areal Flood Advisory	LMK	Clark	56 min
Sep 6, 7:37 PM EDT	Special Weather Statement	LMK	Bourbon	38 min
Sep 6, 12:03 PM EDT	Special Weather Statement	LMK	Harrison	27 min
Sep 6, 5:06 PM EDT	Special Weather Statement	LMK	Dubois	24 min

Nearby

Flash Flood Watches in Kentucky, 2018 Flash Flood Watches in Indiana, 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.