Alert archive / Kentucky / Heat Advisories in 2011

Heat Advisory 3, NWS Louisville, KY

July 18, 201115 counties in Kentucky; 10 counties in Indiana

NWS Louisville, KY issued this heat advisory at Jul 18, 2011, 2:46 PM CDT for 15 counties in Kentucky; 10 counties in Indiana. It took effect at Jul 19, 2011, 10:00 AM CDT. It was in force for 10 hr.

The area

The counties it named.

The facts

Issued: Jul 18, 2011, 2:46 PM CDT (19:46 UTC)
In effect from: Jul 19, 2011, 10:00 AM CDT
Expired: Jul 19, 2011, 8:00 PM CDT
In force: 10 hr
Issued by: NWS Louisville, KY

All 25 counties

Clark County, IN, Crawford County, IN, Dubois County, IN, Floyd County, IN, Harrison County, IN, Jefferson County, IN, Orange County, IN, Perry County, IN, Scott County, IN, Washington County, IN, Breckinridge County, KY, Bullitt County, KY, Butler County, KY, Edmonson County, KY, Grayson County, KY, Hancock County, KY, Hardin County, KY, Jefferson County, KY, Logan County, KY, Meade County, KY, Ohio County, KY, Oldham County, KY, Simpson County, KY, Trimble County, KY, Warren County, KY

The radar

The Louisville radar (KLVX), 23 km from the middle of the area, began a volume at 19:46 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 12:00Z, 7.8 hours before the alert went out and 265 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: 1057 J/kg
Mixed-layer CIN: -29 J/kg
Mixed-layer LCL: 878 m above ground
0-6 km bulk shear: 21 kt
0-1 km storm-relative helicity: 9 m²/s²
0-3 km storm-relative helicity: 22 m²/s²
Significant tornado parameter: 0.1
Supercell composite: 1.1

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this heat advisory 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 heat advisory went out at Jul 18, 2:30 PM CDT, 16 minutes earlier.

Area forecast discussion, Jul 18, 2:30 PM CDT, 16 minutes before

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Hazardous weather outlook, Jul 18, 10:30 AM CDT, 4 hours 16 minutes before

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In the hours before

Special weather statement, Jul 18, 2:25 PM CDT, 21 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
Jul 17, 7:23 PM CDT	Areal Flood Advisory	LMK	Boyle	3 hr
Jul 18, 1:26 PM CDT	Areal Flood Advisory	LMK	Russell	3 hr

Nearby

Heat Advisories in Kentucky, 2011 Heat Advisories in Indiana, 2011 Every heat advisory 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.