Alert archive / Indiana / Flash Flood Watches in 2018

Flash Flood Watch 1, NWS Louisville, KY

April 2, 2018Henry County, Oldham County, Trimble County, Kentucky; 6 counties in Indiana

NWS Louisville, KY issued this flash flood watch at Apr 2, 2018, 9:04 PM EDT for Henry County, Oldham County, Trimble County, Kentucky; 6 counties in Indiana. It took effect at Apr 3, 2018, 12:00 AM EDT. It was in force for 4 hr.

The area

The counties it named.

The facts

Issued: Apr 2, 2018, 9:04 PM EDT (01:04 UTC)
In effect from: Apr 3, 2018, 12:00 AM EDT
Expired: Apr 3, 2018, 3:54 AM EDT
In force: 4 hr
Issued by: NWS Louisville, KY
Flood severity: None

Counties Clark County, IN, Dubois County, IN, Jefferson County, IN, Orange County, IN, Scott County, IN, Washington County, IN, Henry County, KY, Oldham County, KY, Trimble County, KY

The radar

The Louisville radar (KLVX), 65 km from the middle of the area, began a volume at 01:06 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, 1.1 hours before the alert went out and 299 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: 1 J/kg
Mixed-layer CIN: 0 J/kg
Mixed-layer LCL: 549 m above ground
0-6 km bulk shear: 65 kt
0-1 km storm-relative helicity: 233 m²/s²
0-3 km storm-relative helicity: 495 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 Apr 2, 7:39 PM EDT, 1 hour 25 minutes earlier.

Area forecast discussion, Apr 2, 7:39 PM EDT, 1 hour 25 minutes before

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Hazardous weather outlook, Apr 2, 3:13 PM EDT, 5 hours 51 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
Apr 2, 11:31 PM EDT	Special Weather Statement	LMK	Trimble	44 min
Apr 3, 9:46 AM EDT	Special Weather Statement	LMK	Fayette, Jessamine, Mercer	29 min
Apr 3, 11:26 AM EDT	River Flood Advisory	LMK	Breckinridge, Hancock	48 hr
Apr 3, 3:59 PM EDT	Special Weather Statement	LMK	Ohio	16 min
Apr 3, 4:19 PM EDT	Severe Thunderstorm Warning	LMK	Trimble	26 min
Apr 3, 4:41 PM EDT	Severe Thunderstorm Warning	LMK	Trimble	19 min
Apr 3, 4:46 PM EDT	Special Weather Statement	LMK	Oldham	29 min
Apr 3, 4:57 PM EDT	Severe Thunderstorm Warning	LMK	Henry, Jefferson, Oldham	33 min
Apr 3, 5:05 PM EDT	Special Weather Statement	LMK	Henry	10 min
Apr 3, 5:24 PM EDT	Special Weather Statement	LMK	Henry	21 min
Apr 3, 6:07 PM EDT	Severe Thunderstorm Warning	LMK	Harrison	23 min
Apr 3, 6:19 PM EDT	Special Weather Statement	LMK	Franklin	26 min
Apr 3, 6:28 PM EDT	Severe Thunderstorm Warning	LMK	Franklin, Scott	47 min
Apr 3, 6:37 PM EDT	Special Weather Statement	LMK	Ohio	23 min
Apr 3, 6:55 PM EDT	Special Weather Statement	LMK	Harrison	35 min
Apr 3, 7:06 PM EDT	Severe Thunderstorm Warning	LMK	Harrison	24 min
Apr 3, 7:08 PM EDT	Special Weather Statement	LMK	Trimble	22 min
Apr 3, 7:13 PM EDT	Severe Thunderstorm Warning	LMK	Breckinridge	32 min
Apr 3, 7:23 PM EDT	Severe Thunderstorm Warning	LMK	Breckinridge, Butler, Grayson, Ohio	37 min
Apr 3, 7:30 PM EDT	Severe Thunderstorm Warning	LMK	Butler, Edmonson, Grayson, Ohio, Warren	30 min
Apr 3, 7:36 PM EDT	Severe Thunderstorm Warning	LMK	Breckinridge, Bullitt, Hardin, Meade, Nelson	39 min
Apr 3, 7:46 PM EDT	Severe Thunderstorm Warning	LMK	Ohio	18 min
Apr 3, 7:53 PM EDT	Severe Thunderstorm Warning	LMK	Henry, Jefferson, Oldham, Shelby, Trimble	37 min
Apr 3, 7:55 PM EDT	Severe Thunderstorm Warning	LMK	Grayson, Hardin	35 min
Apr 3, 7:57 PM EDT	Severe Thunderstorm Warning	LMK	Butler, Edmonson, Grayson, Hart, Warren	33 min
Apr 2, 9:41 PM EDT	Special Weather Statement	LMK	Orange	34 min
Apr 2, 10:49 PM EDT	Special Weather Statement	LMK	Dubois	41 min
Apr 3, 12:49 AM EDT	Areal Flood Advisory	LMK	Jefferson, Scott, Washington	3 hr
Apr 3, 2:04 PM EDT	Special Weather Statement	LMK	Dubois	26 min
Apr 3, 2:33 PM EDT	Special Weather Statement	LMK	Dubois	27 min
Apr 3, 3:05 PM EDT	Special Weather Statement	LMK	Orange, Washington	25 min
Apr 3, 3:53 PM EDT	Special Weather Statement	LMK	Scott, Washington	37 min
Apr 3, 6:27 PM EDT	Special Weather Statement	LMK	Clark	33 min

Nearby

Flash Flood Watches in Indiana, 2018 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.