709  
FXUS63 KGRB 152130  
AFDGRB  
 
AREA FORECAST DISCUSSION  
NATIONAL WEATHER SERVICE GREEN BAY WI  
330 PM CST WED JAN 15 2025  
 
FORECAST DISCUSSION FOR ROUTINE AFTERNOON FORECAST ISSUANCE  
   
KEY MESSAGES
 
 
- LIGHT SNOW SHOWERS ARE EXPECTED THIS EVENING. A DUSTING TO AN  
INCH IS EXPECTED, CAN WHICH FORM SOME SLIPPERY SPOTS ON AREA  
ROADS AND SIDEWALKS.  
 
- CONFIDENCE IS INCREASING IN POTENTIAL FOR DANGEROUSLY COLD WIND  
CHILLS SUNDAY THROUGH TUESDAY, ESPECIALLY DURING THE MORNINGS.  
 

 
   
DISCUSSION
 
 
ISSUED AT 330 PM CST WED JAN 15 2025  
 
SHORT TERM...TONIGHT AND THURSDAY  
 
LIGHT SNOW SHOWERS THAT CROSSED MINNESOTA THIS AFTERNOON WILL  
WORK THEIR WAY INTO OUR REGION BY THIS EVENING AS THE UPPER TROUGH  
CROSSES THE GREAT LAKES. MOISTURE AND FORCING ALONG THE TROUGH  
WILL BE SOMEWHAT LIMITED, SO SNOW ACCUMULATIONS WILL BE MINOR,  
GENERALLY LESS THAN AN INCH FOR MOST OF THE REGION. ONLY PORTIONS  
OF FAR NORTH- CENTRAL WISCONSIN AND NORTHERN DOOR COUNTY HAVE A  
SHOT AT BREAKING AN INCH OF ACCUMULATION (>30% CHANCE). DESPITE  
THIS, THE TIMING OF THE SNOW WILL BE DURING THE EVENING COMMUTE  
AND COULD STILL PRODUCE A FEW SLICK SPOTS ON AREA ROADS, WHICH MAY  
MAKE FOR A BRIEF WINDOW OF CONCERN FOR MOTORISTS.  
 
TONIGHT WILL BE MUCH WARMER THAN THE LAST COUPLE OF NIGHTS AS LOW  
STRATUS CLOUDS AND WEAK WARM AIR ADVECTION KEEP OVERNIGHT  
TEMPERATURES IN THE TEENS ACROSS THE AREA, ALMOST 20-30 DEGREES  
WARMER THAN THE LAST COUPLE OF NIGHTS.  
 
THURSDAY WILL BE A FAIRLY MILD DAY WHEN COMPARED TO THE LAST FEW  
COLD DAYS, WITH TEMPERATURES IN THE UPPER 20S TO LOWER 30S ACROSS  
MUCH OF THE REGION. SKIES WILL START OFF FAIRLY CLOUDY BUT SOME  
CLEARING COULD WORK ITS WAY INTO THE REGION BY THE AFTERNOON AND  
EVENING ALONG THE LAKE MICHIGAN SHORELINE.  
 
LONG TERM...THURSDAY NIGHT THROUGH WEDNESDAY  
 
COLD NORTHWEST WINDS OVER LAKE SUPERIOR ON THURSDAY, AND SAT-MON  
WILL BRING ABOUT OCCASIONAL LAKE EFFECT SNOW SHOWERS OR FLURRIES  
TO FAR NORTH-CENTRAL WISCONSIN. AMOUNTS WILL BE LIGHT, BUT ANY  
SNOW COULD CREATE SOME SLICK SPOTS ON ROADS.  
 
THE MAIN CONCERN IS FRIGID AIR SUN-TUE. TEMPERATURES AT 850MB FALL  
TO AROUND 30C BELOW, MAKING FOR SURFACE TEMPS WELL BELOW ZERO  
DEGREES FAHRENHEIT OVERNIGHT, AND STRUGGLING TO GET ABOVE ZERO  
DURING THE DAYS. MONDAY AND TUESDAY MORNINGS LOOK COMPARABLY  
COLD, WITH THE PROBABILITY OF GETTING TO 20 BELOW AROUND 70-90% IN  
NORTH-CENTRAL WI, AND 90%+ CHANCE OF GETTING TO 10 BELOW AREA  
WIDE. WIND CHILLS WILL LIKELY BE IN THE 15 TO 30 BELOW RANGE  
THROUGHOUT THIS PERIOD OF TIME, GETTING AS COLD AS 35 BELOW IN  
CENTRAL AND NORTH-CENTRAL WI. HEADLINES WILL LIKELY BE NEEDED AS  
WE GET CLOSER TO THE EVENT.  
 

 
   
AVIATION
 
FOR 18Z TAF ISSUANCE  
ISSUED AT 1143 AM CST WED JAN 15 2025  
 
VFR CONDITIONS ARE EXPECTED TO PERSIST THROUGH THE MIDDLE OF THE  
AFTERNOON AS HIGH CLOUDS SPREAD INTO THE REGION. THEN, LOWER MVFR  
CLOUDS WILL MOVE INTO THE REGION ACCOMPANIED BY SOME LIGHT SNOW  
SHOWERS. THE INITIAL ONSET WILL LOWER VISIBILITIES FROM WEST TO  
EAST ACROSS NORTHEAST WISCONSIN, WITH SOME FLURRIES LIKELY TO LAST  
AT TIMES THROUGH THE OVERNIGHT HOURS. ANY LINGERING SNOW WILL MOVE  
OUT EARLY THURSDAY, WHICH SHOULD ALSO ALLOW SOME CEILING  
IMPROVEMENTS FROM MVFR OVERNIGHT BACK TO VFR FOR MUCH OF THURSDAY.  
 
WINDS WILL BE GUSTY STARTING THIS AFTERNOON THROUGH THE END OF THE  
TAF PERIOD, WITH OCCASIONAL GUSTS UP TO 20T TO 25 KNOTS OUT OF THE  
WEST.  
 

 
   
GRB WATCHES/WARNINGS/ADVISORIES
 
 
NONE.  
 

 
 

 
 
DISCUSSION.....UHLMANN/KLJ  
AVIATION.......UHLMANN  
 
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