Special Weather Statement, NWS Louisville, KY

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE LOUISVILLE KY
746 PM EDT TUE AUG 4 2015

...UPDATED AVIATION DISCUSSION...

.SHORT TERM (NOW THROUGH THURSDAY NIGHT)...
ISSUED AT 315 PM EDT TUE AUG 4 2015

SCATTERED SHOWERS AND STORMS HAVE DEVELOPED ON A DIFFERENTIAL
HEATING AND DEW POINT BOUNDARY ACROSS CENTRAL AND SOUTH CENTRAL KY.
THE SLOW MOVING NATURE OF THESE STORMS MAY PUT DOWN SOME HEAVY
RAINFALL IN SPOTS. A FEW STRONGER STORMS ARE POSSIBLE GIVEN THE
AMOUNT OF INSTABILITY, ALTHOUGH OVERALL ORGANIZATION IS NOT EXPECTED
DUE TO THE LACK OF STRONGER DEEP LAYER SHEAR. SHOWERS/STORMS WILL
PUSH OFF TO THE EAST THROUGH THE EARLY EVENING HOURS, BEFORE A
RELATIVE LULL THROUGH THE OVERNIGHT. CAN'T RULE OUT A FEW SHOWERS
DROPPING IN FROM THE NW, SO WILL LEAVE SMALL CHANCES IN THROUGH THE
OVERNIGHT. LOOK FOR LOWS IN THE UPPER 60S NE TO LOW 70S SW.

DO EXPECT TO SEE ISOLATED TO WIDELY SCATTERED SHOWER/STORM ACTIVITY
MAINLY CONFINDED TO OUR WESTERN CWA ROUGHLY ALONG THE STALLED
BOUNDARY THAT WILL BE IN PLACE. EXPECT MOST HIGHS TO BE IN THE UPPER
80S.

...FLASH FLOOD WATCH LATE WEDNESDAY EVENING THROUGH EARLY FRIDAY...

AS WE ENTER LATER WEDNESDAY AFTERNOON AND EVENING A SLOW MOVING
UPPER WAVE AND ASSOCIATED SURFACE LOW WILL MOVE INTO THE MISSISSIPPI
RIVER VALLEY AND THEN LOWER OHIO RIVER VALLEY. AS THIS OCCURS DEEPER
MOISTURE WILL BE TRANSPORTED IN THROUGH A DEEP LAYER, PARTICULARLY
OF NOTE WILL BE A 40 KNOT LOW LEVEL JET. PRECIPITABLE WATER AMOUNTS
WILL RANGE IN THE 2 - 2.5 RANGE FROM LATE WEDNESDAY NIGHT THROUGH
THURSDAY AS THE SLOW MOVING SYSTEM MOVES THROUGH. SOME AREAS WILL
LIKELY SEE REPEATED ROUNDS OF HEAVY RAINFALL. DURING THIS TIME, 1.5
TO 2 INCHES OF RAIN IS EXPECTED WITH LOCALLY HIGHER AMOUNTS POSSIBLE
ACROSS SOUTHERN IN AND NORTH CENTRAL KY. GIVEN THE METEOROLOGICAL
SETUP, RECENT HEAVY RAINFALL IN SPOTS, AND A WPC SLIGHT RISK OF
EXCESSIVE RAINFALL ELECTED TO ISSUE A FLASH FLOOD WATCH IN
COORDINATION WITH JKL FROM LATER WEDNESDAY EVENING THROUGH EARLY
FRIDAY MORNING ACROSS THE NORTHERN TWO-THIRDS OF THE CWA. AT THIS
POINT, EXPECT THE HEAVIEST AXIS OF RAIN TO FALL ALONG AND ON EITHER
SIDE OF THE I-64 CORRIDOR.

THE SYSTEM SLIDES EAST BY THURSDAY NIGHT WITH PRECIPITATION ENDING
FROM WEST TO EAST. FLASH FLOOD WATCH IS SET TO EXPIRE AT 2 AM EDT/1
AM CDT.

.LONG TERM (FRIDAY THROUGH WEDNESDAY)...
ISSUED AT 325 PM EDT TUE AUG 4 2015

MID LEVEL VORTICITY MAXIMUM WILL PUSH ON OFF TO THE EAST ON FRIDAY
AND IN ITS WAKE, A BIT OF MID-LEVEL RIDGING WILL BUILD IN FROM THE
WEST.  THIS SHOULD GIVE US A TEMPORARY BREAK FROM THE RAINS FROM
MIDWEEK.  HOWEVER, THIS DRY TREND WILL NOT LAST ALL THAT LONG.  THE
LATEST FORECASTS SUGGEST THAT A MID-LEVEL RIDGE AXIS WILL SET BACK
UP ACROSS TEXAS BY THE LATE PART OF THE WEEKEND AND INTO EARLY NEXT
WEEK.  THE UPPER LEVEL RIDGE IS EXPECTED TO BE MORE FLAT, THUS, THE
OHIO VALLEY WILL REMAIN ON THE PERIPHERY OF THE RIDGE AXIS SETTING
THE STAGE FOR MORE UNSETTLED WEATHER AS MID-LEVEL VORT MAXES ROUND
THE TOP OF THE RIDGE.

WHILE FORECAST CONFIDENCE IS LOW REGARDING THE TIMING OF THE WAVES
IN THE LATE PART OF THE PERIOD, IT DOES APPEAR THAT SEVERAL WILL
IMPACT THE REGION FROM LATE SATURDAY NIGHT THROUGH TUESDAY.  THE
FIRST MAY AFFECT OUR REGION LATE SATURDAY NIGHT, FOLLOWED BY ANOTHER
ONE ON MONDAY.  THE PATTERN IS ONE THAT FAVORS ONE OR MORE MESOSCALE
CONVECTIVE COMPLEXES DEVELOPING AND THEN RACING FROM THE CENTRAL
PLAINS THROUGH THE OHIO VALLEY.  IT IS REALLY NOT ALL THAT
SURPRISING GIVEN THIS PATTERN HAS BEEN SEEN IN RECENT WEEKS.  THE
THREAT OF ADDITIONAL HEAVY RAINFALL IS CERTAINLY THERE, AND WE MAY
SEE ADDITIONAL HYDRO ISSUES IN SOME PARTS OF THE AREA EARLY NEXT
WEEK, DEPENDING ON WHERE THE EVENTUAL MCS TRACK SETS UP.

TEMPERATURES WILL START OFF BELOW NORMAL FOR THE PERIOD WITH LOW-MID
80S ACROSS THE REGION ON FRIDAY.  A BRIEF MODERATION IN TEMPS LOOKS
LIKELY FOR SATURDAY AND SUNDAY WITH HIGHS IN THE MID 80S NORTH AND
MID-UPPER 80S IN THE SOUTH.  LOW TO MID 80S LOOK LIKELY FOR MONDAY
AND TUESDAY AS WELL, GIVEN THAT WE'RE EXPECTING CLOUDS AND
PRECIPITATION TO BE IN THE AREA.  IF CONVECTIVE COVERAGE IS LESS,
THEN TEMPERATURES MAY NEED TO BE INCREASED SLIGHTLY IN SUBSEQUENT
FORECASTS.  OVERNIGHT LOWS DURING THE PERIOD WILL BE IN THE UPPER
60S TO THE LOWER 70S.

&&

.AVIATION (00Z TAF UPDATE)...
ISSUED AT 744 PM EDT TUE AUG 4 2015

A LINE OF THUNDERSTORMS PACKING STRONG WINDS AND IFR VSBYS WILL PASS
THROUGH KSDF AT THE START OF THE PERIOD.  THIS LINE MAY PERSIST EAST
INTO LEXINGTON...BUT WILL SEE HOW THINGS PROGRESS BEFORE ADDING MORE
THAN VCTS AT THIS TIME.  AFTER THIS LINE MOVES THROUGH...CONFIDENCE
LOWERS QUITE A BIT IN WHAT MAY OCCUR OVERNIGHT.  THE LATEST HI-RES
GUIDANCE SUITE SUGGESTS ACTIVITY WILL STRUGGLE TO GET GOING
OVERNIGHT...SO HAVE PLAYED DOWN THUNDERSTORM CHANCES AFTER THIS
INITIAL LINE MOVES THROUGH.  THAT BEING SAID...CANNOT RULE OUT
CONVECTION FIRING ACROSS MISSOURI AND WESTERN KENTUCKY
TONIGHT...GETTING INTO KSDF OR KBWG EARLY WEDNESDAY MORNING. IF
CONVECTION DOES NOT REDEVELOP OVERNIGHT...THEN SOME LIGHT FOG WILL
BE POSSIBLE AT KWBG OR KLEX.

WEDNESDAY WILL ALL DEPEND ON HOW CONVECTION PLAYS OUT
OVERNIGHT...BUT ADDITIONAL THUNDERSTORMS WILL BE POSSIBLE TOWARD THE
END OF THE PERIOD AS ANOTHER SYSTEM APPROACHES FROM THE WEST.

&&

.LMK WATCHES/WARNINGS/ADVISORIES...
KY...FLASH FLOOD WATCH FROM WEDNESDAY EVENING THROUGH LATE THURSDAY
     NIGHT FOR KYZ023>043-045>049-053>057-063>067.

IN...FLASH FLOOD WATCH FROM WEDNESDAY EVENING THROUGH LATE THURSDAY
     NIGHT FOR INZ076>079-083-084-089>092.

&&

SHORT TERM........BJS
LONG TERM.........MJ
AVIATION..........KJD

HAZARDOUS WEATHER OUTLOOK...CORRECTED
NATIONAL WEATHER SERVICE LOUISVILLE KY
346 PM EDT TUE AUG 4 2015

KYZ061-062-070>078-081-082-052000-
BUTLER-EDMONSON-LOGAN-WARREN-SIMPSON-ALLEN-BARREN-MONROE-METCALFE-
ADAIR-RUSSELL-CUMBERLAND-CLINTON-
INCLUDING THE CITIES OF...MORGANTOWN...BROWNSVILLE...RUSSELLVILLE...
BOWLING GREEN...FRANKLIN...PROVIDENCE...SCOTTSVILLE...GLASGOW...
TOMPKINSVILLE...EDMONTON...COLUMBIA...RUSSELL SPRINGS...JAMESTOWN...
SALEM...BURKESVILLE...ALBANY
346 PM EDT TUE AUG 4 2015

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

.DAY ONE...TONIGHT.

SCATTERED SHOWERS AND STORMS ARE EXPECTED THIS EVENING AND
OVERNIGHT. ANY STORM WILL BE CAPABLE OF BRIEF HEAVY RAINFALL,
CLOUD TO GROUND LIGHTNING AND GUSTY WINDS.

.DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY.

PERIODS OF SHOWERS AND THUNDERSTORMS ARE EXPECTED WEDNESDAY
THROUGH THURSDAY AS A FRONTAL BOUNDARY MOVES THROUGH THE REGION.
TORRENTIAL RAINFALL, GUSTY WINDS AND LIGHTNING WILL BE THE MAIN
THREATS. ADDITIONAL CHANCES OF THUNDERSTORMS ARE EXPECTED LATE
SUNDAY THROUGH MONDAY AS ANOTHER WEATHER SYSTEM CROSS THE REGION.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION IS NOT EXPECTED AT THIS TIME.

&&

MORE INFORMATION...ALONG WITH OTHER WEATHER...HYDROLOGICAL AND
CLIMATE INFORMATION CAN BE FOUND...AT WEATHER.GOV/LOUISVILLE.

INZ076>079-083-084-089>092-KYZ023>043-045>049-053>057-063>067-052000-
ORANGE-WASHINGTON-SCOTT-JEFFERSON-DUBOIS-CRAWFORD-PERRY-HARRISON-
FLOYD-CLARK-HANCOCK-BRECKINRIDGE-MEADE-OHIO-GRAYSON-HARDIN-BULLITT-
OLDHAM-TRIMBLE-HENRY-SHELBY-FRANKLIN-SPENCER-ANDERSON-WOODFORD-
FAYETTE-BOURBON-NICHOLAS-NELSON-MERCER-JESSAMINE-LARUE-MARION-BOYLE-
GARRARD-MADISON-HART-GREEN-TAYLOR-CASEY-LINCOLN-
INCLUDING THE CITIES OF...PAOLI...ORLEANS...FRENCH LICK...SALEM...
SCOTTSBURG...AUSTIN...MADISON...JASPER...HUNTINGBURG...BROWNSTOWN...
MILLTOWN...MARENGO...TELL CITY...CORYDON...NEW ALBANY...
JEFFERSONVILLE...CLARKSVILLE...LEWISPORT...HAWESVILLE...
HARDINSBURG...IRVINGTON...CLOVERPORT...BRANDENBURG...MULDRAUGH...
BEAVER DAM...HARTFORD...LEITCHFIELD...ELIZABETHTOWN...RADCLIFF...
FORT KNOX...MOUNT WASHINGTON...SHEPHERDSVILLE...HILLVIEW...BROOKS...
LOUISVILLE...LA GRANGE...BUCKNER...CRESTWOOD...PEWEE VALLEY...
BEDFORD...MILTON...EMINENCE...NEW CASTLE...PLEASUREVILLE...
CAMPBELLSBURG...SHELBYVILLE...FRANKFORT...GEORGETOWN...CYNTHIANA...
TAYLORSVILLE...LAWRENCEBURG...VERSAILLES...LEXINGTON...PARIS...
CARLISLE...BARDSTOWN...SPRINGFIELD...HARRODSBURG...NICHOLASVILLE...
WILMORE...WINCHESTER...HODGENVILLE...LEBANON...DANVILLE...
LANCASTER...RICHMOND...BEREA...HORSE CAVE...MUNFORDVILLE...
GREENSBURG...CAMPBELLSVILLE...LIBERTY...STANFORD
346 PM EDT TUE AUG 4 2015

...FLASH FLOOD WATCH IN EFFECT FROM WEDNESDAY EVENING THROUGH LATE
THURSDAY NIGHT...

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

.DAY ONE...TONIGHT.

SCATTERED SHOWERS AND STORMS ARE EXPECTED THIS EVENING AND
OVERNIGHT. ANY STORM WILL BE CAPABLE OF BRIEF HEAVY RAINFALL,
CLOUD TO GROUND LIGHTNING AND GUSTY WINDS.

.DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY.

PERIODS OF SHOWERS AND THUNDERSTORMS ARE EXPECTED WEDNESDAY
THROUGH VERY EARLY FRIDAY AS A FRONTAL BOUNDARY AND UPPER
DISTURBANCE MOVE THROUGH THE REGION. TORRENTIAL RAINFALL, GUSTY
WINDS AND LIGHTNING WILL BE THE MAIN THREATS. ADDITIONAL CHANCES
OF THUNDERSTORMS ARE EXPECTED LATE SUNDAY THROUGH MONDAY AS
ANOTHER WEATHER SYSTEM CROSS THE REGION.

.SPOTTER INFORMATION STATEMENT...

SPOTTERS MAY BE NEEDED TO REPORT HEAVY RAINFALL LATE WEDNESDAY
THROUGH EARLY FRIDAY MORNING.

&&

MORE INFORMATION...ALONG WITH OTHER WEATHER...HYDROLOGICAL AND
CLIMATE INFORMATION CAN BE FOUND...AT WEATHER.GOV/LOUISVILLE.

BJS/MJ

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE LOUISVILLE KY
810 PM EDT TUE AUG 4 2015

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

0800 PM     TSTM WND DMG     BROOKS                  38.07N 85.72W
08/04/2015                   BULLITT            KY   BROADCAST MEDIA

            REPORT OF TREES DOWN IN THE BROOKS AREA.

&&

NWS LOUISVILLE KY
IRIS SYSTEM

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE LOUISVILLE KY
814 PM EDT TUE AUG 4 2015

KYZ030-034-038-039-045-050045-
ANDERSON-NELSON-SPENCER-JEFFERSON-SHELBY-
814 PM EDT TUE AUG 4 2015

...A LINE OF STRONG THUNDERSTORMS WILL AFFECT SHELBY...NORTHEASTERN
JEFFERSON...NORTHWESTERN ANDERSON...SPENCER AND NORTHEASTERN NELSON
COUNTIES...

AT 813 PM EDT...A LINE OF STRONG THUNDERSTORMS WAS ALONG A LINE
EXTENDING FROM JEFFERSONTOWN TO 6 MILES NORTHWEST OF TAYLORSVILLE TO
10 MILES SOUTHEAST OF PIONEER VILLAGE...AND MOVING EAST AT 50 MPH.

WIND GUSTS IN EXCESS OF 50 MPH ARE POSSIBLE WITH THESE STORMS.
PORTIONS OF THE LINE MAY REQUIRE A WARNING.

LOCATIONS IMPACTED INCLUDE...
LOUISVILLE...JEFFERSONTOWN...ST. MATTHEWS...SHELBYVILLE...
BARDSTOWN...LYNDON...MIDDLETOWN...DOUGLASS HILLS...HURSTBOURNE...
GRAYMOOR-DEVONDALE...WINDY HILLS...ANCHORAGE...HURSTBOURNE ACRES...
ST. REGIS PARK...BEECHWOOD VILLAGE...ROLLING HILLS...WOODLAWN PARK...
LANGDON PLACE...BELLEMEADE AND PLANTATION.

TORRENTIAL RAINFALL IS ALSO OCCURRING WITH THESE STORMS...AND MAY
CAUSE LOCALIZED FLOODING. DO NOT DRIVE YOUR VEHICLE THROUGH FLOODED
ROADWAYS.

LAT...LON 3834 8502 3828 8499 3813 8502 3810 8493
      3785 8525 3785 8528 3777 8535 3788 8559
      3791 8558 3799 8549 3801 8551 3809 8547
      3812 8543 3809 8552 3827 8568 3830 8550
      3829 8547 3830 8535 3835 8523
TIME...MOT...LOC 0013Z 262DEG 42KT 3822 8556 3809 8544 3797 8553

RAS

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