759  
FXUS63 KGRB 271131  
AFDGRB  
 
AREA FORECAST DISCUSSION  
NATIONAL WEATHER SERVICE GREEN BAY WI  
631 AM CDT TUE OCT 27 2020  
 
UPDATED AVIATION PORTION FOR 12Z TAF ISSUANCE  
   
SHORT TERM...TODAY...TONIGHT
 
AND WEDNESDAY  
ISSUED AT 338 AM CDT TUE OCT 27 2020  
 
RECORD OR NEAR RECORD COLD TEMPERATURES THIS MORNING WHERE  
THERE IS SNOW ON THE GROUND AND SKIES ARE CLEAR. SOME PLACES IN  
THE NORTHWOODS WERE IN THE SINGLE NUMBERS AT 3 O'CLOCK. SKIES WILL  
BECOME MOSTLY SUNNY TODAY AS WEAK SURFACE RIDGE MOVES ACROSS  
WISCONSIN. TEMPERATURES SHOULD BE A FEW DEGREES HIGHER THAN  
YESTERDAY, BUT STILL ABOUT 15 DEGREES BELOW NORMAL.  
 
WARM ADVECTION SHOULD PRODUCE SOME MID LEVEL CLOUDS TONIGHT THAT  
WILL TEAM UP WITH A STEADY SOUTHWEST WIND TO KEEP TEMPERATURES  
FROM FALLING MUCH TONIGHT. LOWS WILL BE CLOSE TO NORMAL.  
 
A WEAK COLD FRONT MOVING ACROSS THE AREA WEDNESDAY COULD PRODUCE  
SPRINKLES OR FLURRIES NEAR THE MICHIGAN BORDER, AND PERHAPS SOME  
VIRGA FURTHER SOUTH. HIGHS WILL BE A FEW DEGREES BELOW NORMAL.  
   
LONG TERM
 
WEDNESDAY NIGHT THROUGH MONDAY  
ISSUED AT 338 AM CDT TUE OCT 27 2020  
 
THE MAIN FOCI OF THE LONG TERM FORECAST ARE THE INCREASE IN  
TEMPERATURES, WINDS ON SATURDAY, AND A COUPLE OF CHANCES OF  
FLURRIES, MAINLY ACROSS NORTHERN WISCONSIN.  
 
WEDNESDAY NIGHT INTO THURSDAY... AS SURFACE HIGH PRESSURE MOVES  
TOWARD THE REGION FROM THE WEST, NORTH WINDS WILL KEEP MODEST CAA  
IN PLACE ACROSS THE AREA. THERE WILL BE A MODEST INCREASE IN CLOUD  
COVER AS WELL AS A CHANCE FOR SOME LIGHT SNOW FLURRIES ACROSS FAR  
NORTHERN WISCONSIN. MOISTURE WILL LIKELY STILL BE SOMEWHAT  
LIMITED, SO ONLY FLURRIES ARE ANTICIPATED AT THIS TIME.  
 
FRIDAY INTO SATURDAY... THE SURFACE HIGH PRESSURE SYSTEM WILL MAKE  
ITS WAY INTO THE REGION AS A WEAK UPPER RIDGE MOVES ACROSS THE  
AREA, WHICH WILL BRING A RETURN TO SUNNY SKIES. FAIRLY QUIET  
CONDITIONS ARE EXPECTED FOR FRIDAY. AS THE HIGH PRESSURE DEPARTS  
FRIDAY NIGHT, THE TIGHTENING PRESSURE GRADIENT BETWEEN THE HIGH TO  
OUR EAST AND APPROACHING LOW TO OUR WEST WILL BRING A FAIRLY SWIFT  
INCREASE IN WINDS ON SATURDAY. WINDS IN THE LOWER LEVEL APPROACH  
40 TO 45 MPH. ALTHOUGH MOST OF THESE GUST LIKELY WON'T REACH THE  
SURFACE OVER LAND, THE RELATIVELY WARMER WATERS OVER LAKE MICHIGAN  
AND THE BAY OF GREEN BAY COULD BRING A BIT MORE MIXING, WHICH  
COULD POSE A HAZARD TO MARINERS. WINDS WILL BE PREDOMINANTLY FROM  
THE SOUTHWEST, AND THIS RETURN FLOW WILL BRING THE WARMEST DAY  
WE'VE HAD IN SOME TIME, WITH HIGHS AROUND NORMAL IN THE UPPER 40S  
AND LOWER 50S.  
 
REST OF THE FORECAST...SATURDAY NIGHT INTO SUNDAY, AN UPPER LEVEL  
TROUGH AND AFOREMENTIONED LOW PRESSURE SYSTEM WILL PASS THE  
REGION. THE TRAILING COLD FRONT ASSOCIATED WITH THIS SYSTEM COULD  
ONCE AGAIN GRAZE NORTHERN WISCONSIN, BRINGING WITH IT ANOTHER  
CHANCE FOR SOME LIGHT PRECIPITATION. THE COLD AIR WILL BRING A DIP  
IN TEMPERATURES FOR SUNDAY, BACK TO A FEW DEGREES BELOW NORMAL.  
THE COOLER TEMPS WON'T LAST LONG HOWEVER, AS RETURN FLOW STARTS  
EARLY NEXT WEEK, POSSIBLY PUSHING TEMPS A FEW DEGREES ABOVE  
NORMAL, INTO THE UPPER 40S TO MIDDLE 50S.  

 
   
AVIATION
 
FOR 12Z TAF ISSUANCE  
ISSUED AT 630 AM CDT TUE OCT 27 2020  
 
VFR CONDITIONS EXPECTED TODAY THROUGH NOON WEDNESDAY, WITH SOME  
MIDDLE CLOUDS AT TIMES. A COLD FRONT MOVING THROUGH WEDNESDAY  
AFTERNOON COULD PRODUCE SEVERAL HOURS OF MVFR CEILINGS NORTH OF  
RHINELANDER, WITH VFR CONDITIONS TO THE SOUTH. LOW LEVEL WIND  
SHEAR COULD BE A CONSIDERATION TONIGHT WITH SOUTHWEST WINDS AROUND  
10 KNOTS AT THE SURFACE WITH SOUTHWEST WINDS OF 40 TO 50 KNOTS AT  
2000 FT AGL.  
 

 
   
GRB WATCHES/WARNINGS/ADVISORIES
 
 
NONE.  

 
 

 
 
SHORT TERM.....RDM  
LONG TERM......UHLMANN  
AVIATION.......RDM  
 
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