Alert archive / Kentucky / Flash Flood Watches in 2020

Flash Flood Watch 4, NWS Louisville, KY

March 19, 202020 counties in Kentucky; 10 counties in Indiana

NWS Louisville, KY issued this flash flood watch at Mar 19, 2020, 4:23 AM EDT for 20 counties in Kentucky; 10 counties in Indiana. It took effect at Mar 19, 2020, 8:00 PM EDT. It was in force for 11 hr.

The area

The counties it named.

The facts

Issued: Mar 19, 2020, 4:23 AM EDT (08:23 UTC)
In effect from: Mar 19, 2020, 8:00 PM EDT
Expired: Mar 20, 2020, 7:16 AM EDT
In force: 11 hr
Issued by: NWS Louisville, KY
Flood severity: None

All 30 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, Anderson County, KY, Breckinridge County, KY, Bullitt County, KY, Butler County, KY, Franklin County, KY, Grayson County, KY, Hancock County, KY, Hardin County, KY, Harrison County, KY, Henry County, KY, Jefferson County, KY, Meade County, KY, Nelson County, KY, Ohio County, KY, Oldham County, KY, Scott County, KY, Shelby County, KY, Spencer County, KY, Trimble County, KY, Woodford County, KY

The radar

The Louisville radar (KLVX), 24 km from the middle of the area, began a volume at 08:26 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

Lincoln, IL (KILX), launched 00:00Z, 8.4 hours before the alert went out and 329 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 581 m above ground
0-6 km bulk shear: 54 kt
0-1 km storm-relative helicity: 11 m²/s²
0-3 km storm-relative helicity: -15 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 Mar 19, 3:50 AM EDT, 33 minutes earlier.

Area forecast discussion, Mar 19, 3:50 AM EDT, 33 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
Mar 19, 3:11 PM EDT	River Flood Warning	LMK	Butler, Warren	4 days
Mar 19, 6:09 PM EDT	Special Weather Statement	LMK	Trimble	36 min
Mar 19, 6:11 PM EDT	Special Weather Statement	LMK	Warren	34 min
Mar 19, 6:30 PM EDT	Special Weather Statement	LMK	Simpson	30 min
Mar 19, 6:41 PM EDT	Special Weather Statement	LMK	Warren	34 min
Mar 19, 6:56 PM EDT	Special Weather Statement	LMK	Allen	34 min
Mar 19, 7:54 PM EDT	Special Weather Statement	LMK	Casey	36 min
Mar 19, 5:32 PM EDT	Special Weather Statement	LMK	Clark	28 min
Mar 19, 5:55 PM EDT	Special Weather Statement	LMK	Clark	35 min

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.