Alert archive / Kentucky / Special Weather Statements in 2012

Special Weather Statement, NWS Louisville, KY

April 30, 2012Shelby County, Kentucky

NWS Louisville, KY issued this special weather statement at Apr 30, 2012, 7:45 PM EDT for Shelby County, Kentucky. It was in force for 30 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued
Apr 30, 2012, 7:45 PM EDT (23:45 UTC)
Expired
Apr 30, 2012, 8:15 PM EDT
In force
30 min
Issued by
NWS Louisville, KY

County Shelby County, KY

The radar

The Louisville radar (KLVX), 78 km from the middle of the area, began a volume at 23:47 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

Cncnati-Daytn, OH (KILN), launched 12:00Z, 11.8 hours before the alert went out and 179 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-pSkew-T log-p diagram, Cncnati-Daytn, OH at 12:00Z on 2012-04-30Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 12 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Cncnati-Daytn, OH at 12:00Z on 2012-04-30The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 206 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
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
12 J/kg
Mixed-layer CIN
-296 J/kg
Mixed-layer LCL
1163 m above ground
0-6 km bulk shear
42 kt
0-1 km storm-relative helicity
206 m²/s²
0-3 km storm-relative helicity
215 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.3

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

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What forecasters said that day

The local office's own words before this special weather statement 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 special weather statement went out at Apr 30, 7:13 PM EDT, 32 minutes earlier.

Area forecast discussion, Apr 30, 7:13 PM EDT, 32 minutes before
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Hazardous weather outlook, Apr 30, 6:03 PM EDT, 1 hour 42 minutes before
HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE LOUISVILLE KY
603 PM EDT MON APR 30 2012

INZ076>079-083-084-089>092-KYZ023>043-045>049-053>057-061>067-
070>078-081-082-012215-
ORANGE IN-WASHINGTON IN-SCOTT IN-JEFFERSON IN-DUBOIS IN-
CRAWFORD IN-PERRY IN-HARRISON IN-FLOYD IN-CLARK IN-HANCOCK KY-
BRECKINRIDGE KY-MEADE KY-OHIO KY-GRAYSON KY-HARDIN KY-BULLITT KY-
JEFFERSON KY-OLDHAM KY-TRIMBLE KY-HENRY KY-SHELBY KY-FRANKLIN KY-
SCOTT KY-HARRISON KY-SPENCER KY-ANDERSON KY-WOODFORD KY-
FAYETTE KY-BOURBON KY-NICHOLAS KY-NELSON KY-WASHINGTON KY-
MERCER KY-JESSAMINE KY-CLARK KY-LARUE KY-MARION KY-BOYLE KY-
GARRARD KY-MADISON KY-BUTLER KY-EDMONSON KY-HART KY-GREEN KY-
TAYLOR KY-CASEY KY-LINCOLN KY-LOGAN KY-WARREN KY-SIMPSON KY-
ALLEN KY-BARREN KY-MONROE KY-METCALFE KY-ADAIR KY-RUSSELL KY-
CUMBERLAND KY-CLINTON KY-
603 PM EDT MON APR 30 2012 /503 PM CDT MON APR 30 2012/

THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF SOUTH CENTRAL
INDIANA AND CENTRAL KENTUCKY.

.DAY ONE...TONIGHT.

A COLD FRONT APPROACHING THE AREA WILL COMBINE WITH INCREASING
MOISTURE INCREASING AND RELATIVELY WARM TEMPERATURES TO PRODUCE
STRONG TO SEVERE THUNDERSTORMS INTO THE EVENING. THE STRONGEST
STORMS WILL PRODUCE DAMAGING WINDS...HAIL...HEAVY RAINFALL...AND
FREQUENT TO EXCESSIVE CLOUD TO GROUND LIGHTNING. A SEVERE
THUNDERSTORM WATCH IS THUS IN EFFECT FOR MOST OF THE REGION.

ADDITIONAL SHOWERS AND STORMS ARE EXPECTED TO RE-DEVELOP LATE IN
THE EVENING AND OVERNIGHT...BUT THESE STORMS ARE NOT EXPECTED TO
BE SEVERE.

.DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY.

NUMEROUS STORMS WILL CONTINUE TO FORM IN A MOIST AIRMASS DURING
THE DAY TUESDAY. THE MAIN THREATS HERE WILL BE HEAVY RAINFALL AND
FREQUENT CLOUD TO GROUND LIGHTNING.

SCATTERED AFTERNOON AND EVENING THUNDERSTORMS ARE POSSIBLE FRIDAY
AFTERNOON THROUGH SUNDAY AFTERNOON AS A SERIES OF IMPULSES MOVE
ALONG A POSSIBLE FRONTAL BOUNDARY ACROSS SOUTHERN INDIANA. GUSTY
WINDS...CLOUD TO GROUND LIGHTNING AND BRIEF HEAVY RAIN WILL
ACCOMPANY ANY STORMS.

.SPOTTER INFORMATION STATEMENT...

SPOTTERS SHOULD REPORT ANY STRONGER WIND GUSTS AS WELL AS HAIL TO
THE NATIONAL WEATHER SERVICE THIS AFTERNOON AND TONIGHT.

In the hours before

Special weather statement, Apr 30, 6:50 PM EDT, 55 minutes before
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Special weather statement, Apr 30, 6:52 PM EDT, 53 minutes before
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Special weather statement, Apr 30, 7:16 PM EDT, 29 minutes before
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Special weather statement, Apr 30, 7:24 PM EDT, 21 minutes before
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Special weather statement, Apr 30, 7:30 PM EDT, 15 minutes before
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Special weather statement, Apr 30, 7:45 PM EDT, 0 minutes before
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The office that day

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

IssuedProductOfficeCountiesLasted
Apr 30, 4:28 PM EDTSpecial Weather StatementLMKAllen, Barren47 min
Apr 30, 5:12 PM EDTSpecial Weather StatementLMKAdair, Metcalfe48 min
Apr 30, 5:18 PM EDTSpecial Weather StatementLMKHancock27 min
Apr 30, 5:41 PM EDTSpecial Weather StatementLMKMeade34 min
Apr 30, 5:44 PM EDTSpecial Weather StatementLMKLogan46 min
Apr 30, 5:52 PM EDTSevere Thunderstorm WarningLMKBreckinridge, Meade23 min
Apr 30, 6:16 PM EDTSevere Thunderstorm WarningLMKButler, Logan, Simpson, Warren29 min
Apr 30, 6:19 PM EDTSpecial Weather StatementLMKBullitt, Hardin, Jefferson26 min
Apr 30, 6:44 PM EDTSpecial Weather StatementLMKWarren46 min
Apr 30, 6:50 PM EDTSpecial Weather StatementLMKBullitt, Henry, Jefferson, Nelson, Oldham, Shelby and 1 more25 min
Apr 30, 7:05 PM EDTSevere Thunderstorm WarningLMKAllen, Barren, Edmonson, Hart, Warren25 min
Apr 30, 7:16 PM EDTSpecial Weather StatementLMKHenry, Shelby29 min
Apr 30, 7:30 PM EDTSpecial Weather StatementLMKHart30 min
Apr 30, 4:59 PM EDTSevere Thunderstorm WarningLMKPerry46 min
Apr 30, 5:22 PM EDTSpecial Weather StatementLMKCrawford23 min
Apr 30, 6:33 PM EDTSpecial Weather StatementLMKDubois27 min
Apr 30, 6:52 PM EDTSpecial Weather StatementLMKCrawford, Orange23 min
Apr 30, 7:24 PM EDTSpecial Weather StatementLMKClark36 min

Nearby

Special Weather Statements in Kentucky, 2012Every special weather statement in 2012

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.