267  
FXUS63 KARX 100809  
AFDARX  
 
AREA FORECAST DISCUSSION  
NATIONAL WEATHER SERVICE LA CROSSE WI  
309 AM CDT WED SEP 10 2025  
   
KEY MESSAGES
 
 
- SCATTERED SHOWERS LINGER ACROSS PORTIONS OF IOWA AND WISCONSIN  
EARLY THIS MORNING WITH DENSE FOG BUILDING IN ACROSS PORTIONS  
OF MINNESOTA.  
 
- WARMING THROUGH THE WEEKEND WITH HIGHS TOPPING 80 DEGREES FOR  
MOST FRIDAY THROUGH SUNDAY  
 

 
   
DISCUSSION
 
 
ISSUED AT 300 AM CDT WED SEP 10 2025  
 
THIS MORNING - TONIGHT  
 
AREAS OF SHOWERS AND A FEW RUMBLES OF THUNDER CONTINUE EARLY  
THIS MORNING ACROSS THE AREA AS AN UPPER LEVEL SHORTWAVE TROUGH  
CONTINUES TO TREK EAST THROUGH THE UPPER MIDWEST. SHOWERS WILL  
CONTINUE TO TRACK IN A GENERAL EASTWARD DIRECTION THROUGH THE  
MORNING HOURS WITH SOME LINGERING SHOWERS ACROSS WEST CENTRAL  
AND SOUTHWEST WISCONSIN AFTER 12Z. AS THE RAIN AND CLOUDS CLEAR  
FROM THE WEST, MANY SITES ACROSS MINNESOTA HAVE STARTED TO  
DEVELOP DENSE FOG. DEPENDING ON HOW QUICKLY CLOUDS CLEAR OUT IN  
OUR AREA, A DENSE FOG ADVISORY MAY BE NEEDED, LIKELY FOR  
PORTIONS OF SOUTHEASTERN MINNESOTA, BY DAYBREAK. WILL CONTINUE  
TO MONITOR TRENDS AND TRAFFIC CAMS THROUGH THE MORNING HOURS FOR  
THIS POTENTIAL.  
 
AS THE SHORTWAVE AND SUBSEQUENT SHOWERS PUSH OFF TO THE EAST  
THROUGH THE DAY, CLOUDS WILL BEGIN TO LIGHTEN UP BY THE  
AFTERNOON. WITH CLEARING SKIES, LIGHT WINDS, RECENT WETTING  
RAINS, AND LOW DEW POINT DEPRESSIONS, ANOTHER ROUND OF FOG LOOKS  
TO BE POSSIBLE ACROSS MUCH OF THE AREA TONIGHT AND INTO  
TOMORROW MORNING. CONFIDENCE IN THIS IS STILL ON THE LOWER END  
FOR NOW BUT WENT AHEAD AND INCLUDED PATCHY FOG IN THE FORECAST  
FOR MUCH OF THE AREA.  
 
THURSDAY - EARLY NEXT WEEK  
 
TEMPERATURES: AN UPPER LEVEL RIDGE IS EXPECTED TO BUILD ACROSS  
THE PLAINS LATE THIS WEEK WITH THE RIDGE AXIS GRADUALLY PIVOTING  
OVER THE UPPER MISSISSIPPI VALLEY AS AN UPPER TROUGH OVER THE  
WEST COAST MOVES INTO THE ROCKIES AND HIGH PLAINS. WARM AIR IS  
EXPECTED TO POOL UNDER THIS RIDGE, ESPECIALLY SATURDAY AND  
SUNDAY. SOUTHERLY MID TO LOW LEVEL FLOW WILL ALLOW ANOMALOUSLY  
WARM 850 MB TEMPERATURES TO SURGE NORTHWARD INTO THE REGION  
STARTING LATE FRIDAY AND CONTINUING THROUGH THE WEEKEND. THESE  
850 MB TEMPS IN QUESTION WILL BE 7-10 DEGREES C ABOVE NORMAL FOR  
MID-SEPTEMBER. WITH THE INCREASED HEIGHTS ALOFT FROM THE  
RIDGING AND WARM 850 MB TEMPERATURES, HIGHS WILL BE RATHER MILD  
FOR THE WEEKEND. NBM 10.01Z PROBABILITIES SHOW A 60-90% CHANCE  
OF TEMPERATURES AT OR ABOVE 80 DEGREES ON FRIDAY. THESE ONLY  
INCREASE FOR SATURDAY INTO SUNDAY WITH 70-100% CHANCES OF HIGHS  
AT OR ABOVE 80 DEGREES. THE ONLY PLACES THAT COULD STAY OUT OF  
THE 80S WOULD BE FAR NORTHERN PORTIONS OF CLARK AND TAYLOR  
COUNTIES WHERE PROBABILITIES TEND TO DROP OFF. THE GFS  
CONTINUES TO SHOW A WARM BIAS AMONG THE ENSEMBLES (THE ONLY  
ENSEMBLE SHOWING SLIGHT POTENTIAL FOR 90S SAT/SUN) AND IT SEEMS  
TO BE SKEWING THE NBM TOWARDS THE HIGHER END OF GUIDANCE. THIS  
IS LIKELY DUE TO THE RECENT STRETCH OF DRY CONDITIONS WE'VE SEEN  
OVER THE LAST FEW WEEKS. HAVE DECIDED TO BLEND HIGH  
TEMPERATURES SATURDAY AND SUNDAY DOWN A FEW DEGREES TO KEEP  
HIGHS MORE IN LINE WITH THE BULK OF CURRENT GUIDANCE.  
TEMPERATURES THESE DAYS ARE STILL EXPECTED TO BE 10+ DEGREES F  
ABOVE NORMAL IN THE MID TO UPPER 80S.  
 
MODELS ARE STILL STRUGGLING WITH HOW TO HANDLE THE EVOLUTION OF  
THE UPPER LEVEL PATTERN AFTER SATURDAY. THE GENERAL THOUGHT IS  
THAT OUR AREA WOULD RETURN TO A MORE WEAK ZONAL PATTERN. THIS  
WOULD FAVOR A MORE GRADUAL RETURN TO NEAR NORMAL HIGH  
TEMPERATURES BY MID-WEEK (LOW TO MID 70S). UNTIL THEN, HIGH  
TEMPERATURES MONDAY AND TUESDAY ARE EXPECTED TO HOLD IN THE  
LOWER 80S FOR MOST.  
 
RAIN CHANCES: THE AFOREMENTIONED UPPER LEVEL RIDGE IS EXPECTED  
TO WEAKEN AS WE MOVE INTO THE WEEKEND. HOWEVER, AS MENTIONED  
EARLIER, MODELS ARE STRUGGLING WITH HOW TO HANDLE THE UPPER  
LEVEL PATTERN AFTER THIS HAPPENS. IF WE LEAN TOWARDS THE MORE  
ZONAL SOLUTION, WHICH APPEARS MOST PLAUSIBLE AT THIS POINT,  
THIS WOULD KEEP SOME UPPER LEVEL ENERGY AROUND AND WOULD LIKELY  
MOVE SOME SHORTWAVES OVER THE UPPER MISSISSIPPI VALLEY. WITH  
DECENT MOISTURE STILL PRESENT ACROSS THE AREA (PWATS IN THE  
1.25-1.5 INCH RANGE), THIS COULD CREATE SOME CHANCES FOR RAIN.  
HOWEVER, DUE TO THE LACK OF LOW LEVEL FORCING AND NO DISCERNIBLE  
FOCI FOR CONVECTION AS OF YET, CONFIDENCE IN WHERE RAIN COULD  
FORM IS VERY LOW. ONCE THE UPPER LEVEL PATTERN COMES A BIT MORE  
INTO FOCUS, POPS WILL LIKELY BE REFINED BUT FOR NOW HAVE KEPT  
WITH THE MODEL BLEND WHICH TENDS TO KEEP POPS IN THE 15- 30%  
RANGE THROUGH MID-WEEK.  
 

 
   
AVIATION /06Z TAFS THROUGH 06Z THURSDAY/
 
 
ISSUED AT 1154 PM CDT TUE SEP 9 2025  
 
VFR TO MVFR CONDITIONS CURRENTLY PRESENT ACROSS THE REGION WITH  
AREAS OF LIGHT TO MODERATE SHOWERS SLOWLY PUSHING EAST/SOUTHEAST  
THROUGH THE AREA. THESE SHOWERS WILL CONTINUE TO MOVE AWAY FROM THE  
TERMINALS AND INTO CENTRAL/EASTERN WISCONSIN OVER THE COMING HOURS.  
BEHIND THESE SHOWERS, AREAS OF DENSE FOG HAVE BEGUN TO DEVELOP  
ACROSS NORTHERN AND CENTRAL MINNESOTA. THIS IS EXPECTED TO FILL  
IN BEHIND THE RAIN AND COULD IMPACT THE RST TERMINAL IN THE  
COMING HOURS. RST CURRENTLY LOOKS TO BE RIGHT ON THE EDGE OF  
WHERE THE DENSE FOG WILL LIKELY SET UP SO HAVE STUCK WITH MVFR  
VISIBILITIES AND IFR CIGS FOR NOW THOUGH THIS MAY NEED TO BE  
AMENDED SHOULD THE FOG OVER-PERFORM. LSE SHOULD STAY CLEAR OF  
THE FOG THIS MORNING AND REMAIN VFR. WINDS WILL REMAIN LIGHT  
THROUGH THE PERIOD BECOMING MORE NORTHERLY THROUGH THE AFTERNOON  
HOURS.  
 

 
   
ARX WATCHES/WARNINGS/ADVISORIES
 
 
WI...NONE.  
MN...NONE.  
IA...NONE.  
 

 
 

 
 
DISCUSSION...BARENDSE  
AVIATION...BARENDSE  
 
CLICK HERE TO GO TO PREVIOUS BULLETINS.

The Nexlab WI Page
The Nexlab IA Page
The Nexlab MN Page Main Text Page