Alert archive / Kentucky / Flash Flood Warnings in 2010

Flash Flood Warning 64, NWS Jackson, KY

August 18, 2010Knox County, Laurel County, Whitley County, Kentucky

NWS Jackson, KY issued this flash flood warning at Aug 18, 2010, 8:48 AM EDT for Knox County, Laurel County, Whitley County, Kentucky. It was in force for 6 hr. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: Aug 18, 2010, 8:48 AM EDT (12:48 UTC)
Expired: Aug 18, 2010, 2:30 PM EDT
In force: 6 hr
Issued by: NWS Jackson, KY
Area: Storm-based polygon
Flood severity: None

Counties Knox County, KY, Laurel County, KY, Whitley County, KY

The radar

The Jackson,KY radar (KJKL), 98 km from the middle of the area, began a volume at 12:47 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, 0.8 hours before the alert went out and 245 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: 1640 J/kg
Mixed-layer CIN: -1 J/kg
Mixed-layer LCL: 460 m above ground
0-6 km bulk shear: 24 kt
0-1 km storm-relative helicity: 116 m²/s²
0-3 km storm-relative helicity: 130 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 2.7

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this flash flood warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Jackson, KY wrote its last area forecast discussion before this flash flood warning went out at Aug 18, 8:03 AM EDT, 45 minutes earlier.

Area forecast discussion, Aug 18, 8:03 AM EDT, 45 minutes before

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Hazardous weather outlook, Aug 18, 4:27 AM EDT, 4 hours 21 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE JACKSON KY
427 AM EDT WED AUG 18 2010

KYZ044-050>052-058>060-068-069-079-080-083>088-104-106>120-191130-
FLEMING-MONTGOMERY-BATH-ROWAN-ESTILL-POWELL-MENIFEE-ROCKCASTLE-
JACKSON-PULASKI-LAUREL-WAYNE-MCCREARY-WHITLEY-KNOX-BELL-HARLAN-
ELLIOTT-MORGAN-JOHNSON-WOLFE-MAGOFFIN-FLOYD-LEE-BREATHITT-KNOTT-
OWSLEY-PERRY-CLAY-LESLIE-LETCHER-MARTIN-PIKE-
427 AM EDT WED AUG 18 2010

THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF EASTERN KENTUCKY.

.DAY ONE...TODAY AND TONIGHT.

LOCALLY HEAVY RAIN IS A POSSIBILITY TODAY AND THIS EVENING...ESPECIALLY
SOUTH OF THE MOUNTAIN PARKWAY. ANY SLOW MOVING THUNDERSTORMS WILL BE
CAPABLE OF PRODUCING MINOR FLOODING OF LOW LYING AREAS. ISOLATED
LOCATIONS THAT SEE REPEATED ROUNDS OF THUNDERSTORMS MAY EXPERIENCE
FLASH FLOODING.

THUNDERSTORMS ARE POSSIBLE TODAY AND TONIGHT. THEN AGAIN FROM
THURSDAY THROUGH SUNDAY NIGHT...MAINLY DURING THE LATE AFTERNOON AND
EVENING HOURS.

.DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY.

THUNDERSTORMS ARE POSSIBLE THURSDAY AND THEN AGAIN SATURDAY THROUGH
MONDAY NIGHT...MAINLY DURING THE LATE AFTERNOON AND EVENING HOURS.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION IS NOT ANTICIPATED.

JJ

In the hours before

Local storm report, Aug 18, 8:36 AM EDT, 12 minutes before

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Local storm report, Aug 18, 8:48 AM EDT, 0 minutes before

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The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 18, 8:40 AM EDT	Areal Flood Advisory	JKL	Knox, Laurel, McCreary, Pulaski, Wayne, Whitley	6 hr
Aug 18, 9:05 AM EDT	Areal Flood Advisory	JKL	Breathitt, Clay, Jackson, Knott, Laurel, Lee and 5 more	6 hr
Aug 18, 9:14 AM EDT	Flash Flood Watch	JKL	Bath, Bell, Breathitt, Clay, Elliott, Estill and 27 more	23 hr
Aug 18, 9:16 AM EDT	Flash Flood Warning	JKL	Laurel, McCreary, Pulaski, Wayne, Whitley	6 hr
Aug 18, 11:25 AM EDT	Areal Flood Advisory	JKL	Bell	3 hr
Aug 18, 2:07 PM EDT	Areal Flood Warning	JKL	Knox, Laurel, Whitley	4 hr
Aug 18, 2:22 PM EDT	Areal Flood Advisory	JKL	Bell, Knox, Laurel, McCreary, Pulaski, Wayne and 1 more	4 hr

Nearby

Flash Flood Warnings in Kentucky, 2010 Every flash flood warning in 2010

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.