739
FXUS63 KLMK 111111
AFDLMK
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE LOUISVILLE KY
711 AM EDT THU SEP 11 2025
KEY MESSAGES
* CONTINUED MOSTLY DRY AND ABNORMALLY WARM THROUGH THE WEEKEND INTO
EARLY NEXT WEEK. HIGHS IN THE UPPER 80S TO LOW 90S.
* POTENTIAL FOR RAPID ONSET DROUGHT AND ENHANCED FIRE WEATHER
CONDITIONS CONTINUES TO INCREASE FOR MID-TO-LATE SEPTEMBER.
SHORT TERM /THROUGH TONIGHT/
ISSUED AT 353 AM EDT THU SEP 11 2025
WEAK SHORTWAVE TROUGH CONTINUES TO SLOWLY WORK THROUGH SOUTHERN KY
INTO TN DURING THE EARLY MORNING WITH AN ISOLATED CLUSTER OF SHOWERS
ALONG THE TN/KY BORDER. THIS ACTIVITY WILL CONTINUE TO PUSH
SOUTHEAST AND OUT OF THE AREA BEFORE SUNRISE. CLEARING ACROSS
SOUTHERN IN AND NORTH CENTRAL KY HAS ALLOWED FOR SOME VERY PATCHY
FOG TO DEVELOP WHICH WILL MIX OUT AS WE GO THROUGH THE MORNING.
UPPER RIDGING BUILDING OUT OF THE SOUTHERN PLAINS EXPANDS NORTHWARD
DURING THE DAY AS THE SHORTWAVE TROUGH CONTINUES TO WORK EASTWARD.
WEAK INVERTED SFC TROUGH WILL BE LOCATED ACROSS WESTERN KY, SOUTHERN
IL INTO SOUTHWEST IN. THIS MAY BE ENOUGH FORCING TO HELP FIRE OFF
ISOLATED POP UP SHOWERS IN THE AFTERNOON. DECIDED TO GO WITH A 10
PERCENT POP FOR THE SOUTHERN HALF OF OUR CWA LATER THIS AFTERNOON.
WITH SFC HIGH PRESSURE TO OUR NORTH OVER HUDSON BAY, MOST OF THE CWA
WILL LIKELY REMAIN DRY. WITH INCREASING HEIGHTS THANKS TO THE
EXPANDING UPPER RIDGE, TEMPERATURES CONTINUE TO BE WARMER WITH HIGHS
RANGING FROM MID/UPPER 80S TO NEAR 90 ACROSS OUR SOUTHWEST.
ANY ACTIVITY SHOULD START TO DIMINISH WITH THE LOSS OF DAYTIME
HEATING AS WE GO INTO THE EVENING HOURS, SKIES WILL BE MOSTLY CLEAR,
WINDS WILL BE LIGHT AND LOWS WILL BE IN THE MID/UPPER 50S TO NEAR
60. PATCHY VALLEY FOG COULD ONCE AGAIN FORM ACROSS THE REGION.
LONG TERM /FRIDAY THROUGH WEDNESDAY/
ISSUED AT 353 AM EDT THU SEP 11 2025
UPPER RIDGING WILL CONTINUE TO EXPAND NORTHEASTWARD FROM TX INTO THE
OHIO VALLEY AND GREAT LAKES THROUGH THE WEEKEND AND INTO EARLY NEXT
WEEK. LOCKED INTO THIS PATTERN, TEMPERATURES WILL CONTINUE TO WARM
FROM THE MID/UPPER 80S TO NEAR 90 ON FRIDAY TO LOW 90S INTO THE
WEEKEND AND EARLY NEXT WEEK. RETURN FLOW OUT OF THE SOUTH WILL
REMAIN LIMITED AS DEWPOINTS STAY MAINLY IN THE 50S THROUGH THE
WEEKEND. WITH THE UNSEASONABLY WARM TEMPERATURES AND LOWER
DEWPOINTS, COMBINED WITH ABNORMALLY DRY TO EVEN MODERATE DROUGHT
CONDITIONS ACROSS CENTRAL KY AND SOUTHERN IN, WE WILL CONTINUE TO
SEE ELEVATED FIRE WEATHER CONCERNS. WITH SURFACE WINDS STAYING
LIGHT, THE CONCERN OF SPREADING IS LIMITED. WITH THE PROLONGED DRY
WEATHER EXPECTED THROUGH THE EXTENDED FORECAST, THE FIRE WEATHER
PARAMETERS WILL NEED TO BE MONITORED.
AS FOR OUR NEXT CHANCE OF PRECIPITATION, UPPER RIDGING LOOKS TO HOLD
FIRM OVER THE OHIO VALLEY AND INTO THE GREAT LAKES INTO THE FIRST
HALF OF NEXT WEEK. WHILE A WEAK BACKDOOR COLD FRONT IS EXPECTED TO
DROP SOUTHWARD SUNDAY NIGHT INTO MONDAY, THE TREND IN THE
DETERMINISTIC MODELS IS FOR THIS BOUNDARY TO BE MOISTURE STARVED
WITH VERY LOW POPS ASSOCIATED WITH IT.
AVIATION /12Z TAFS THROUGH 18Z FRIDAY/
ISSUED AT 710 AM EDT THU SEP 11 2025
LATEST SURFACE ANALYSIS REVEALS EXPANSIVE HIGH PRESSURE
CENTERED OVER ONTARIO AND SPREADING SOUTHWARD INTO THE OH VALLEY,
WHILE CURRENT SATELLITE SHOWS MOSTLY CLEAR SKIES WITH A FEW AREAS OF
PATCHY FOG. SEVERAL OBSERVATIONS ACROSS SOUTHERN INDIANA AND CENTRAL
KY ARE REPORTING LIFR TO MVFR VIS IN FOG, AND EXPECT THIS TO
CONTINUE UNTIL SHORTLY AFTER SUNRISE, ESPECIALLY AT LEX, RGA, AND
HNB. OTHERWISE, VFR CONDITIONS WILL PREVAIL FOR MOST OF THIS TAF
CYCLE, WITH SCATTERED CLOUDS THIS AFTERNOON AND A LIGHT NORTHERLY
WIND. LIGHT FOG WILL LIKELY PRESENT ITSELF AGAIN FRIDAY MORNING AT
THE SAME AFOREMENTIONED TAF SITES.
LMK WATCHES/WARNINGS/ADVISORIES
KY...NONE.
IN...NONE.
SHORT TERM...BTN
LONG TERM...BTN
AVIATION...CG
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