Alert archive / Kentucky / Flash Flood Watches in 2017

Flash Flood Watch 8, NWS Paducah, KY

December 21, 20175 counties in Kentucky

NWS Paducah, KY issued this flash flood watch at Dec 21, 2017, 4:05 PM CST for 5 counties in Kentucky. It took effect at Dec 22, 2017, 12:00 PM CST. It was in force for 21 hr.

The area

The counties it named.

The facts

Issued: Dec 21, 2017, 4:05 PM CST (22:05 UTC)
In effect from: Dec 22, 2017, 12:00 PM CST
Expired: Dec 23, 2017, 9:00 AM CST
In force: 21 hr
Issued by: NWS Paducah, KY
Flood severity: None

Counties Calloway County, KY, Christian County, KY, Graves County, KY, Todd County, KY, Trigg County, KY

The radar

The Ft Campbell radar (KHPX), 54 km from the middle of the area, began a volume at 22:04 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, 10.1 hours before the alert went out and 136 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: 563 m above ground
0-6 km bulk shear: 39 kt
0-1 km storm-relative helicity: 1 m²/s²
0-3 km storm-relative helicity: 72 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 Dec 20, 5:23 PM CST, 22 hours 42 minutes earlier.

Area forecast discussion, Dec 20, 5:23 PM CST, 22 hours 42 minutes before

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Nearby

Flash Flood Watches in Kentucky, 2017 Every flash flood watch in 2017

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.