Alert archive / Kentucky / Flash Flood Watches in 2020

Flash Flood Watch 13, NWS Paducah, KY

August 13, 202018 counties in Kentucky; 18 counties in Illinois; 9 counties in Missouri

NWS Paducah, KY issued this flash flood watch at Aug 13, 2020, 10:56 AM CDT for 18 counties in Kentucky; 18 counties in Illinois; 9 counties in Missouri. It was in force for 9 hr.

The area

The counties it named.

The facts

Issued: Aug 13, 2020, 10:56 AM CDT (15:56 UTC)
Expired: Aug 13, 2020, 7:46 PM CDT
In force: 9 hr
Issued by: NWS Paducah, KY
Flood severity: None

All 45 counties

Alexander County, IL, Edwards County, IL, Franklin County, IL, Gallatin County, IL, Hamilton County, IL, Hardin County, IL, Jackson County, IL, Jefferson County, IL, Johnson County, IL, Massac County, IL, Perry County, IL, Pope County, IL, Pulaski County, IL, Saline County, IL, Union County, IL, Wayne County, IL, White County, IL, Williamson County, IL, Ballard County, KY, Caldwell County, KY, Calloway County, KY, Carlisle County, KY, Crittenden County, KY, Daviess County, KY, Fulton County, KY, Graves County, KY, Henderson County, KY, Hickman County, KY, Hopkins County, KY, Livingston County, KY, Lyon County, KY, Marshall County, KY, McCracken County, KY, McLean County, KY, Union County, KY, Webster County, KY, Bollinger County, MO, Butler County, MO, Cape Girardeau County, MO, Mississippi County, MO, New Madrid County, MO, Perry County, MO, Scott County, MO, Stoddard County, MO, Wayne County, MO

The radar

The Paducah radar (KPAH), 35 km from the middle of the area, began a volume at 15:56 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, 3.9 hours before the alert went out and 237 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: 374 J/kg
Mixed-layer CIN: -88 J/kg
Mixed-layer LCL: 971 m above ground
0-6 km bulk shear: 9 kt
0-1 km storm-relative helicity: 17 m²/s²
0-3 km storm-relative helicity: 17 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 Paducah, KY wrote its last area forecast discussion before this flash flood watch went out at Aug 13, 6:25 AM CDT, 4 hours 31 minutes earlier.

Area forecast discussion, Aug 13, 6:25 AM CDT, 4 hours 31 minutes before

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Hazardous weather outlook, Aug 13, 3:57 AM CDT, 6 hours 59 minutes before

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In the hours before

Special weather statement, Aug 13, 6:49 AM CDT, 4 hours 7 minutes before

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The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 13, 1:51 PM CDT	Areal Flood Advisory	PAH	Daviess	65 min
Aug 13, 3:54 PM CDT	Special Weather Statement	PAH	Daviess	36 min
Aug 13, 3:57 PM CDT	Areal Flood Advisory	PAH	Daviess	110 min
Aug 13, 5:25 PM CDT	Special Weather Statement	PAH	Crittenden	35 min
Aug 13, 5:33 PM CDT	Areal Flood Advisory	PAH	Crittenden, Livingston	104 min
Aug 13, 6:12 PM CDT	Flash Flood Warning	PAH	Crittenden	95 min
Aug 13, 6:35 PM CDT	Areal Flood Advisory	PAH	Lyon	77 min
Aug 13, 1:24 PM CDT	Flash Flood Warning	PAH	Franklin	2 hr
Aug 13, 2:14 PM CDT	Areal Flood Advisory	PAH	Hamilton	84 min
Aug 13, 3:55 PM CDT	Areal Flood Advisory	PAH	Jackson	78 min
Aug 13, 5:33 PM CDT	Special Weather Statement	PAH	Massac	27 min
Aug 13, 5:43 PM CDT	Areal Flood Advisory	PAH	Massac	90 min
Aug 13, 1:20 AM CDT	Areal Flood Advisory	PAH	Butler	3 hr

Nearby

Flash Flood Watches in Kentucky, 2020 Flash Flood Watches in Illinois, 2020 Flash Flood Watches in Missouri, 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.