427  
FXUS63 KMKX 202059  
AFDMKX  
 
AREA FORECAST DISCUSSION  
NATIONAL WEATHER SERVICE MILWAUKEE/SULLIVAN WI  
259 PM CST FRI DEC 20 2024  
   
KEY MESSAGES
 
 
- ARCTIC AIR WILL SETTLE OVER SOUTHERN WISCONSIN TONIGHT INTO  
SUNDAY MORNING, WITH ABOVE NORMAL TEMPERATURES RETURNING FOR  
NEXT WEEK.  
 
- THE NEXT CHANCES FOR LIGHT PRECIPITATION IS MONDAY, WHICH MAY  
FALL AS RAIN AS TEMPS ARE WARMING.  
 

 
   
SHORT TERM
 
 
ISSUED 258 PM CST FRI DEC 20 2024  
 
TONIGHT THROUGH SATURDAY NIGHT:  
 
NLY WINDS AND COLD ADVECTION WILL WEAKEN TNT AS A SFC RIDGE  
APPROACHES WRN WI FROM MN AND IA. GIVEN THE FRESH SNOW COVER,  
LOWERED THE TEMPS A FEW DEGREES TNT WITH MOSTLY SINGLE DIGIT  
TEMPS EXPECTED. THE SFC RIDGE WILL THEN MOVE ACROSS SRN WI ON  
SAT WITH HIGHS ONLY IN THE UPPER TEENS TO LOWER 20S. CLOUD COVER  
VIA MID TO UPPER LEVEL WARM ADVECTION WILL AID IN THE COLD  
DAYTIME TEMPS. THE HIGH WILL BE SLOW TO MOVE OFF SAT EVE SO  
EXPECT TEMPS TO DROP QUICKLY ONCE AGAIN INTO THE SINGLE DIGITS,  
ALTHOUGH SOME MID TO UPPER LEVEL CLOUDS COULD LINGER THROUGH  
THE NIGHT.  
 
GEHRING  
 

 
   
LONG TERM
 
 
ISSUED 258 PM CST FRI DEC 20 2024  
 
SUNDAY THROUGH FRIDAY:  
 
BREEZY SLY WINDS AND WARM ADVECTION WILL THEN PREVAIL SUN-MON AM  
AHEAD OF A SHORTWAVE TROUGH APPROACHING FROM THE NRN GREAT  
PLAINS. ITS SFC LOW WILL LIKELY TRACK ACROSS NRN WI ON MON WITH  
A WEAK COLD FRONTAL PASSAGE OVER SRN WI IN THE AFTERNOON. MUCH  
OF THE DEEPER LIFT AND SATURATION IS EXPECTED TO THE NORTH SO  
RAIN/SNOW CHANCES WILL RANGE FROM 50-60 PERCENT OVER CENTRAL WI  
TO 20-30 PERCENT AT THE IL BORDER. ANY PCPN AMOUNTS ARE EXPECTED  
TO BE LIGHT. ONLY MINOR COLD ADVECTION AFTERWARD QUICKLY  
FOLLOWED BY UPPER RIDGING AND A SFC RIDGE FOR LATER TUE-WED.  
 
A SERIES OF UPPER TROUGHS OVER THE DESERT SW AND SRN GREAT  
PLAINS WILL LIFT NEWD TOWARD THE GREAT LAKES OR OHIO VALLEY FOR  
WED NT INTO THE WEEKEND. THERE IS MUCH UNCERTAINTY ON THE TRACK  
AND EVOLUTION SO RAIN CHANCES ARE ONLY 20 PERCENT AT THIS TIME.  
TEMPS WILL BE ABOVE NORMAL DURING THIS PERIOD.  
 
GEHRING  
 

 
   
AVIATION
 
 
ISSUED 258 PM CST FRI DEC 20 2024  
 
LOCAL MVFR CIGS OVER FAR SE WI LATE THIS AFTERNOON. OTHERWISE  
VFR CONDITIONS TNT-SAT EVE.  
 
GEHRING  
 

 
   
MARINE
 
 
ISSUED 258 PM CST FRI DEC 20 2024  
 
A RIDGE OF HIGH PRESSURE AROUND 30.6 INCHES OVER MINNESOTA AND  
IOWA WILL MOVE INTO WESTERN WI LATE TONIGHT. BRISK NORTHERLY  
WINDS WILL CONTINUE OVER THE OPEN LAKE INTO THE EVENING, WITH A  
FEW GUSTS APPROACHING GALE FORCE OVER FAR SOUTHERN PORTIONS OF THE  
LAKE. WIND GUSTS WILL TAPER LATER TONIGHT THROUGH SATURDAY  
AFTERNOON, AS THE HIGH PRESSURE AREA APPROACHES FROM THE WEST. THE  
HIGH WILL SHIFT ACROSS THE LAKE SATURDAY NIGHT WITH LIGHT AND  
VARIABLE WINDS. BREEZY SOUTH WINDS WILL THEN DEVELOP FOR SUNDAY  
INTO MONDAY AS THE HIGH MOVES AWAY AND LOW PRESSURE APPROACHES  
FROM MINNESOTA. GALE FORCE WINDS WILL BE POSSIBLE SUNDAY NIGHT  
INTO MONDAY MORNING.  
 
A SMALL CRAFT ADVISORY CONTINUES INTO THIS EVENING FROM  
SHEBOYGAN TO WINTHROP HARBOR VIA LINGERING HIGH WAVES.  
 
GEHRING  
 

 
   
MKX WATCHES/WARNINGS/ADVISORIES
 
 
WI...NONE.  
LM...SMALL CRAFT ADVISORY...LMZ643-LMZ644 UNTIL 9 PM FRIDAY.  
 
SMALL CRAFT ADVISORY...LMZ645-LMZ646 UNTIL MIDNIGHT SATURDAY.  
 

 
 

 
 
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