754  
FXUS63 KARX 082359  
AFDARX  
 
AREA FORECAST DISCUSSION  
NATIONAL WEATHER SERVICE LA CROSSE WI  
659 PM CDT MON AUG 8 2022  
   
DISCUSSION
 
(THIS EVENING THROUGH MONDAY)  
ISSUED AT 239 PM CDT MON AUG 8 2022  
 
KEY MESSAGES:  
 
- POTENTIAL FOR VALLEY FOG TONIGHT  
 
- NEXT RAIN CHANCES END OF THE WEEK INTO THE WEEKEND  
 
TONIGHT...FOG POTENTIAL  
 
WITH AN AREA OF HIGH PRESSURE MOVING IN OVERHEAD TONIGHT, THE  
SETUP FOR A VALLEY FOG EVENT LOOKS PRETTY GOOD. WINDS LOOKS TO BE  
UNDER 10 KNOTS FOR A PRETTY DEEP LAYER WITH CALM TO NEARLY CALM AT  
THE SURFACE. FORECAST SOUNDINGS SHOW SATURATION OCCURRING AT THE  
SURFACE AND SLOWLY DEEPENING TOWARD SUNRISE. SOME CAVEATS FOR  
DENSE FOG FORMING TONIGHT ARE THAT THE SATURATED LAYER DOES NOT  
LOOK TO BE ALL THE DEEP AND WITH THE NORTH WINDS OCCURRING TODAY  
AS THE HIGH MOVES IN, THAT SHOULD PRODUCE SOME GENERAL DRYING OF  
THE DEW POINT. EXPECT TO SEE SOME FOG IN THE MORNING, THE QUESTION  
IS JUST HOW DENSE IT WILL BE.  
 
END OF THE WEEK INTO THE WEEKEND...SMALL RAIN CHANCES  
 
THROUGH THE MIDDLE OF THE WEEK, RIDGING ALOFT AND AT THE SURFACE  
WILL BE THE DOMINANT FEATURE WITH SEASONABLE AND QUIET WEATHER.  
THE UPPER LEVEL RIDGE LOOKS TO RETROGRADE TO THE WEST JUST ENOUGH  
FOR THE END OF THE WEEK TO ALLOW SOME RIDGE RUNNER SHORT WAVE  
TROUGHS TO START DROPPING ACROSS THE GREAT LAKES AND UPPER MIDWEST  
REGIONS. THE FIRST OF THESE POTENTIALLY COULD DROP ACROSS THE  
AREA THURSDAY NIGHT AND FRIDAY BRINGING A CHANCE OF RAIN WITH IT.  
A COUPLE MORE MAY THEN SLIDE THROUGH OVER THE WEEKEND WITH ANOTHER  
CHANCE FOR SOME RAIN BOTH SATURDAY AND SUNDAY.  
 

 
   
AVIATION
 
(FOR THE 00Z TAFS THROUGH 00Z TUESDAY EVENING)  
ISSUED AT 659 PM CDT MON AUG 8 2022  
 
HIGH PRESSURE OVERHEAD WILL FAVOR VFR CONDITIONS FOR THE MAJORITY OF  
THE TAF PERIOD, THE EXCEPTION BEING VALLEY FOG AT LSE EARLY TOMORROW  
MORNING. MODELS CONTINUE TO FAVOR THE FORMATION OF VALLEY FOG, BUT  
THERE ARE A FEW VARIABLES THAT DO NOT MAKE IT A SLAM DUNK CASE. MOST  
NOTABLY, NORTH/NORTHWESTERLY WINDS ARE NOT AS CONDUCIVE FOR VALLEY  
FOG IMPACTS AT THE TERMINAL. WITH THAT BEING SAID, A LIGHT WIND  
LAYER UP TO 5000 FEET IS PROGGED TO DEVELOP BY MIDNIGHT AND CLEAR  
SKIES WILL CERTAINLY SUPPORT SUFFICIENT COOLING OVERNIGHT. SOME  
UNCERTAINTY EXISTS FOR HOW LOW VISIBILITIES WILL FALL, BUT WE WILL  
CONTINUE TO MONITOR THE CURRENT CONDITIONS OVER THE NEXT FEW HOURS  
WHICH WILL GIVE US BETTER INSIGHT INTO THE LIKELIHOOD FOR DENSE  
FOG.  
 

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

 
 

 
 
DISCUSSION...04  
AVIATION...KAA  
 
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