Alert archive / Kentucky / Flash Flood Warnings in 2010

Flash Flood Warning 42, NWS Louisville, KY

August 12, 2010Grayson County, Kentucky

NWS Louisville, KY issued this flash flood warning at Aug 12, 2010, 4:55 PM CDT for Grayson County, Kentucky. It was in force for 2 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 12, 2010, 4:55 PM CDT (21:55 UTC)
Expired: Aug 12, 2010, 7:00 PM CDT
In force: 2 hr
Issued by: NWS Louisville, KY
Area: Storm-based polygon
Flood severity: None

County Grayson County, KY

The radar

The Louisville radar (KLVX), 67 km from the middle of the area, began a volume at 21:57 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 12:00Z, 9.9 hours before the alert went out and 357 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: 2302 J/kg
Mixed-layer CIN: -19 J/kg
Mixed-layer LCL: 721 m above ground
0-6 km bulk shear: 11 kt
0-1 km storm-relative helicity: 9 m²/s²
0-3 km storm-relative helicity: 37 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 warning 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 warning went out at Aug 12, 2:28 PM CDT, 2 hours 27 minutes earlier.

Area forecast discussion, Aug 12, 2:28 PM CDT, 2 hours 27 minutes before

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Hazardous weather outlook, Aug 12, 2:57 PM CDT, 1 hour 58 minutes before

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In the hours before

Special weather statement, Aug 12, 3:50 PM CDT, 1 hour 5 minutes before

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Local storm report, Aug 12, 4:12 PM CDT, 43 minutes before

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Special weather statement, Aug 12, 4:15 PM CDT, 40 minutes before

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Special weather statement, Aug 12, 4:25 PM CDT, 30 minutes before

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Special weather statement, Aug 12, 4:40 PM CDT, 15 minutes before

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Special weather statement, Aug 12, 4:49 PM CDT, 6 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
Aug 12, 1:25 PM CDT	Special Weather Statement	LMK	Jefferson	35 min
Aug 12, 1:33 PM CDT	Severe Thunderstorm Warning	LMK	Jefferson	13 min
Aug 12, 2:02 PM CDT	Special Weather Statement	LMK	Shelby	28 min
Aug 12, 2:10 PM CDT	Severe Thunderstorm Warning	LMK	Bullitt, Jefferson, Spencer	35 min
Aug 12, 2:33 PM CDT	Special Weather Statement	LMK	Spencer	27 min
Aug 12, 2:37 PM CDT	Special Weather Statement	LMK	Hart	23 min
Aug 12, 2:44 PM CDT	Special Weather Statement	LMK	Hart	31 min
Aug 12, 3:00 PM CDT	Special Weather Statement	LMK	Spencer	30 min
Aug 12, 3:09 PM CDT	Special Weather Statement	LMK	Hardin	36 min
Aug 12, 3:14 PM CDT	Special Weather Statement	LMK	Butler, Ohio	61 min
Aug 12, 3:16 PM CDT	Severe Thunderstorm Warning	LMK	Anderson, Nelson, Washington	19 min
Aug 12, 3:31 PM CDT	Special Weather Statement	LMK	Green, Metcalfe	29 min
Aug 12, 3:45 PM CDT	Special Weather Statement	LMK	Hardin	30 min
Aug 12, 3:50 PM CDT	Special Weather Statement	LMK	Logan	40 min
Aug 12, 4:00 PM CDT	Severe Thunderstorm Warning	LMK	Grayson, Hardin, Hart	30 min
Aug 12, 4:15 PM CDT	Special Weather Statement	LMK	Logan, Warren	30 min
Aug 12, 4:25 PM CDT	Special Weather Statement	LMK	Metcalfe	35 min
Aug 12, 4:40 PM CDT	Areal Flood Advisory	LMK	Grayson, Hardin, Hart	110 min
Aug 12, 4:40 PM CDT	Special Weather Statement	LMK	Warren	35 min
Aug 12, 4:49 PM CDT	Special Weather Statement	LMK	Grayson	26 min
Aug 12, 4:59 PM CDT	Special Weather Statement	LMK	Edmonson	31 min
Aug 12, 5:01 PM CDT	Special Weather Statement	LMK	Cumberland	44 min
Aug 12, 5:07 PM CDT	Severe Thunderstorm Warning	LMK	Barren, Edmonson, Warren	23 min
Aug 12, 5:16 PM CDT	Special Weather Statement	LMK	Edmonson	44 min
Aug 12, 5:28 PM CDT	Severe Thunderstorm Warning	LMK	Barren, Edmonson, Hart, Warren	13 min
Aug 12, 5:45 PM CDT	Special Weather Statement	LMK	Hardin	45 min
Aug 12, 6:09 PM CDT	Severe Thunderstorm Warning	LMK	Breckinridge, Hardin, Meade	36 min
Aug 12, 6:36 PM CDT	Areal Flood Advisory	LMK	Breckinridge, Hardin, Meade	114 min
Aug 12, 2:51 PM CDT	Special Weather Statement	LMK	Floyd	24 min

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.