Alert archive / Kentucky / Flash Flood Watches in 2011

Flash Flood Watch 5, NWS Jackson, KY

September 5, 201122 counties in Kentucky

NWS Jackson, KY issued this flash flood watch at Sep 5, 2011, 3:42 AM EDT for 22 counties in Kentucky. It was in force for 32 hr.

The area

The counties it named.

The facts

Issued: Sep 5, 2011, 3:42 AM EDT (07:42 UTC)
Expired: Sep 6, 2011, 12:05 PM EDT
In force: 32 hr
Issued by: NWS Jackson, KY
Flood severity: None

All 22 counties

Bell County, KY, Breathitt County, KY, Clay County, KY, Floyd County, KY, Harlan County, KY, Jackson County, KY, Johnson County, KY, Knott County, KY, Knox County, KY, Laurel County, KY, Leslie County, KY, Letcher County, KY, Magoffin County, KY, Martin County, KY, McCreary County, KY, Owsley County, KY, Perry County, KY, Pike County, KY, Pulaski County, KY, Rockcastle County, KY, Wayne County, KY, Whitley County, KY

The radar

The Jackson,KY radar (KJKL), 45 km from the middle of the area, began a volume at 07:43 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

Cncnati-Daytn, OH (KILN), launched 00:00Z, 7.7 hours before the alert went out and 246 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: 226 J/kg
Mixed-layer CIN: -27 J/kg
Mixed-layer LCL: 749 m above ground
0-6 km bulk shear: 25 kt
0-1 km storm-relative helicity: -5 m²/s²
0-3 km storm-relative helicity: 31 m²/s²
Significant tornado parameter: 0.0
Supercell composite: -0.1

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 Jackson, KY wrote its last area forecast discussion before this flash flood watch went out at Sep 5, 3:40 AM EDT, 2 minutes earlier.

Area forecast discussion, Sep 5, 3:40 AM EDT, 2 minutes before

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Hazardous weather outlook, Sep 4, 4:33 PM EDT, 11 hours 9 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE JACKSON KY
433 PM EDT SUN SEP 4 2011

KYZ044-050>052-058>060-068-069-079-080-083>088-104-106>120-051100-
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-
433 PM EDT SUN SEP 4 2011

THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF EASTERN KENTUCKY.

.DAY ONE...TONIGHT.

THUNDERSTORMS WILL BE POSSIBLE THROUGH THIS EVENING. SOME OF THE
STORMS COULD PRODUCE STRONG WINDS AS WELL AS LOCALLY HEAVY RAINFALL.

MORE STEADY RAINFALL IS EXPECTED LATER TONIGHT...WHICH COULD CAUSE
SOME MINOR FLOODING OF SMALL STREAMS AND CREEKS IN LOCATIONS THAT
HAVE SEEN RECENT HEAVY RAINFALL.

.DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY.

A PROLONGED PERIOD OF RAIN...HEAVY AT TIMES...IS EXPECTED TO CONTINUE
THROUGH AT LEAST TUESDAY FOR MUCH OF EAST KENTUCKY. RAINFALL AMOUNTS
ARE EXPECTED TO GENERALLY RANGE FROM 2 TO 4 INCHES BY TUESDAY
EVENING. ISOLATED FLASH FLOODING WILL BE POSSIBLE IN AREAS THAT
EXPERIENCE LOCALLY HEAVY RAINFALL. ALSO...SIGNIFICANT RISES ARE
LIKELY ON AREA CREEKS AND STREAMS...ESPECIALLY SOUTHEAST OF A LINE
FROM LONDON...TO HAZARD...TO PRESTONSBURG.

.SPOTTER INFORMATION STATEMENT...

SPOTTERS ARE ENCOURAGED TO REPORT ANY STRONG WINDS...AS WELL AS ANY
OCCURRENCES OF FLOODING.

GEOGERIAN

In the hours before

Local storm report, Sep 4, 10:46 PM EDT, 4 hours 56 minutes before

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Local storm report, Sep 4, 10:48 PM EDT, 4 hours 54 minutes before

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Local storm report, Sep 4, 10:57 PM EDT, 4 hours 45 minutes before

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Local storm report, Sep 4, 10:59 PM EDT, 4 hours 43 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
Sep 4, 8:53 PM EDT	Areal Flood Advisory	JKL	Bell, Clay, Harlan, Knox, Leslie	6 hr
Sep 4, 10:16 PM EDT	Areal Flood Advisory	JKL	Floyd, Johnson, Knott, Martin, Pike	5 hr
Sep 4, 10:34 PM EDT	Areal Flood Warning	JKL	Floyd, Johnson, Knott, Martin, Pike	4 hr
Sep 5, 1:21 PM EDT	Areal Flood Advisory	JKL	Bell, Harlan	6 hr
Sep 5, 1:49 PM EDT	Areal Flood Advisory	JKL	Letcher, Pike	3 hr
Sep 5, 3:40 PM EDT	Flash Flood Warning	JKL	Harlan, Letcher	6 hr
Sep 5, 4:53 PM EDT	Areal Flood Advisory	JKL	Harlan, Letcher, Pike	6 hr
Sep 5, 7:50 PM EDT	Areal Flood Advisory	JKL	Bell, Clay, Harlan, Knox, Leslie, Letcher and 1 more	6 hr

Nearby

Flash Flood Watches in Kentucky, 2011 Every flash flood watch in 2011

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.