Alert archive / Kentucky / Excessive Heat Warnings in 2011

Excessive Heat Warning 1, NWS Louisville, KY

July 11, 201115 counties in Kentucky; 10 counties in Indiana

NWS Louisville, KY issued this excessive heat warning at Jul 11, 2011, 2:41 AM CDT for 15 counties in Kentucky; 10 counties in Indiana. It took effect at Jul 11, 2011, 12:00 PM CDT. It was in force for 7 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: Jul 11, 2011, 2:41 AM CDT (07:41 UTC)
In effect from: Jul 11, 2011, 12:00 PM CDT
Expired: Jul 11, 2011, 7:00 PM CDT
In force: 7 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 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 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: 71 J/kg
Mixed-layer CIN: -303 J/kg
Mixed-layer LCL: 1558 m above ground
0-6 km bulk shear: 29 kt
0-1 km storm-relative helicity: 21 m²/s²
0-3 km storm-relative helicity: 81 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 excessive heat 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 excessive heat warning went out at Jul 11, 2:27 AM CDT, 14 minutes earlier.

Area forecast discussion, Jul 11, 2:27 AM CDT, 14 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 11, 1:57 PM CDT	Heat Advisory	LMK	Adair, Allen, Anderson, Barren, Bourbon, Boyle and 43 more	29 hr

Nearby

Excessive Heat Warnings in Kentucky, 2011 Excessive Heat Warnings in Indiana, 2011 Every excessive heat warning 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.