Alert archive / Kentucky / Severe Thunderstorm Warnings in 2009

Severe Thunderstorm Warning 214, NWS Louisville, KY

June 20, 20097 counties in Kentucky

NWS Louisville, KY issued this severe thunderstorm warning at Jun 20, 2009, 5:45 AM EDT for 7 counties in Kentucky. It was in force for 45 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: Jun 20, 2009, 5:45 AM EDT (09:45 UTC)
Expired: Jun 20, 2009, 6:30 AM EDT
In force: 45 min
Issued by: NWS Louisville, KY
Area: Storm-based polygon

Counties Bourbon County, KY, Clark County, KY, Fayette County, KY, Harrison County, KY, Nicholas County, KY, Scott County, KY, Woodford County, KY

The radar

The Jackson,KY radar (KJKL), 113 km from the middle of the area, began a volume at 09:49 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 watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Jun 20, 12:46 AM EDT	Severe Thunderstorm Watch	SPC	6 hr
Jun 20, 2:34 AM EDT	Severe Thunderstorm Watch	SPC	4 hr

The nearest sounding before it

Cncnati-Daytn, OH (KILN), launched 00:00Z, 9.8 hours before the alert went out and 146 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: 1460 J/kg
Mixed-layer CIN: -43 J/kg
Mixed-layer LCL: 1481 m above ground
0-6 km bulk shear: 35 kt
0-1 km storm-relative helicity: 87 m²/s²
0-3 km storm-relative helicity: 92 m²/s²
Significant tornado parameter: 0.3
Supercell composite: 8.8

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this severe thunderstorm 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 severe thunderstorm warning went out at Jun 20, 3:15 AM EDT, 2 hours 30 minutes earlier.

Area forecast discussion, Jun 20, 3:15 AM EDT, 2 hours 30 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE LOUISVILLE KY
315 AM EDT SAT JUN 20 2009

.SHORT TERM (TODAY AND TONIGHT)...

SHOWERS AND THUNDERSTORMS EARLY THIS MORNING WILL BE ON THE
WANE...BECOMING WIDELY SCATTERED SOON AFTER SUNRISE. IT APPEARS THE
BEST CHANCE OF SHOWERS AND A STORM OR TWO THIS MORNING WILL BE ALONG
AND A COUPLE COUNTIES EITHER SIDE OF THE I-64 CORRIDOR. THAT
ACTIVITY SHOULD DIMINISH BY LATE MORNING.

THEN THIS AFTERNOON SCATTERED REDEVELOPMENT IS POSSIBLE...PRIMARILY
OVER SOUTHERN KENTUCKY. LEFTOVER BOUNDARIES FROM MORNING CONVECTION
MAY HELP TO SERVE AS A FOCUS FOR RENEWED DEVELOPMENT.

ANY AFTERNOON THUNDERSTORMS WILL THEN DIMINISH THIS EVENING WITH
LOSS OF HEATING...FOLLOWED BY PARTLY CLOUDY SKIES.

WENT ON THE LOW SIDE OF GUIDANCE FOR HIGH TEMPS TODAY WITH WET
GROUND AND A FAIR AMOUNT OF DEBRIS CLOUD POSSIBLE THIS
MORNING...ESPECIALLY IN THE NORTH. HIGHS SHOULD STILL RANGE IN THE
UPPER 80S TO LOWER 90S HOWEVER...AND MUGGY CONDITIONS WILL CONTINUE
AS WELL. TONIGHT TEMPERATURES WILL FALL INTO THE UPPER 60S AND LOWER
70S.

.LONG TERM (SUNDAY THROUGH FRIDAY)...

SUNDAY THROUGH TUESDAY...

HEADING INTO SUNDAY THE FRONT MAKING PROGRESSING THROUGH ON SATURDAY
WILL WEAKEN AND BEGIN TO  TAKE ON A NORTHWEST TO SOUTHEAST
ORIENTATION. THIS TRANSITION WILL OCCUR AS THE BOUNDARY IS STALLED
OUT ACROSS THE SOUTH CENTRAL KENTUCKY. HAVE INSERTED A SLIGHT CHANCE
OF PRECIPITATION FOR THIS REGION ON SUNDAY. ON MONDAY THE
GFS...NAM...AND SREF ARE ALL IN AGREEMENT WITH DEVELOPING
PRECIPITATION OVER INDIANA WHICH WILL THEN PROGRESS SOUTHWARD OVER
KENTUCKY DURING THE AFTERNOON AND EVENING HOURS. HAVE THEREFORE
RAISED POPS TO THE CHANCE RANGE FOR MONDAY.

CONDITIONS WILL CONTINUE TO REMAIN HOT AND MUGGY THROUGH THIS PERIOD
WITH HIGHS RANGING FROM THE UPPER 80S TO THE LOWER 90S. LOWS WILL BE
GENERALLY BE IN THE UPPER 60S TO LOW 70S. NO CHANGES WERE MADE TO
THE EXTENDED PERIOD. THE PREVIOUS DISCUSSION FOLLOWS.

WEDNESDAY THROUGH FRIDAY...

BOTH THE ECMWF AND THE GFS FORECAST A FLATTENING OF THE UPPER AIR
FLOW...WITH A ZONAL JET BECOMING ESTABLISHED ACROSS THE NORTHERN
TIER OF STATES. WITH THE STORM TRACK BECOMING ESTABLISHED NEAR THE
CANADIAN BORDER...EXPECT DRY...BUT HUMID AND MOSTLY CLEAR CONDITIONS
FOR THE LOWER OHIO VALLEY.

&&

.AVIATION (06Z TAFS)...

WATCHING THUNDERSTORMS NORTH OF THE TERMINALS EARLY THIS MORNING.
OVER THE PAST SEVERAL HOURS STORMS HAVE BEEN FALLING APART AS THEY
APPROACH THE OHIO RIVER. SEVERAL DIFFERENT MODEL SOLUTIONS AGREE
THAT THIS TREND WILL CONTINUE. SO...WILL NOT HAVE MUCH IN THE WAY OF
TSRA AT THE TAF SITES. WILL INCLUDE A CB CLOUD TYPE AT SDF AND LEX
DURING THE MORNING HOURS AFTER SUNRISE AS THE REMNANTS OF THE
COMPLEX TO OUR NORTH FINALLY SLIDE THROUGH.

SOME REDEVELOPMENT WILL BE POSSIBLE THIS AFTERNOON OVER SOUTHERN
KENTUCKY ON ANY LEFTOVER BOUNDARIES FROM THE MORNING CONVECTION.
HOWEVER COVERAGE WILL BE SO SPARSE THAT BWG TAF FOR NOW WILL JUST
HAVE A CB CLOUD TYPE.

INSERTED LOW LEVEL SHEAR IN THE TAFS FOR THE PRE-DAWN HOURS AS LOW
LEVEL JET STRENGTHENS. VWP AT KLVX HAS BEEN SHOWING 40KT WINDS AT
2000 FEET SINCE JUST BEFORE 1AM.

&&

.LMK WATCHES/WARNINGS/ADVISORIES...
KY...NONE.
IN...NONE.
&&

SHORT TERM..13
LONG TERM...EES
AVIATION....13

Hazardous weather outlook, Jun 20, 4:28 AM EDT, 1 hour 17 minutes before

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In the hours before

Local storm report, Jun 20, 3:42 AM EDT, 2 hours 3 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE LOUISVILLE KY
342 AM EDT SAT JUN 20 2009

..TIME..    ...EVENT...     ...CITY LOCATION...      ...LAT.LON...
..DATE..    ....MAG....     ..COUNTY LOCATION.. ST.. ...SOURCE....
            ..REMARKS..

0339 AM     TSTM WND GST     6 N MADISON             38.84N  85.38W
06/20/2009  M69 MPH          JEFFERSON          IN   AWOS

&&

EVENT NUMBER LMK0900093

13

Special weather statement, Jun 20, 3:59 AM EDT, 1 hour 46 minutes before

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Special weather statement, Jun 20, 4:05 AM EDT, 1 hour 40 minutes before

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Special weather statement, Jun 20, 4:57 AM EDT, 48 minutes before

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Special weather statement, Jun 20, 5:30 AM EDT, 15 minutes before

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Special weather statement, Jun 20, 5:36 AM EDT, 9 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
Jun 20, 3:20 AM EDT	Severe Thunderstorm Warning	LMK	Trimble	40 min

Nearby

Severe Thunderstorm Warnings in Kentucky, 2009 Every severe thunderstorm warning in 2009

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.