739  
FXUS63 KGRB 240407  
AFDGRB  
 
AREA FORECAST DISCUSSION  
NATIONAL WEATHER SERVICE GREEN BAY WI  
1007 PM CST TUE JAN 23 2018  
 
UPDATED AVIATION PORTION FOR 06Z TAF ISSUANCE  
   
SHORT TERM
 
TONIGHT AND WEDNESDAY  
ISSUED AT 228 PM CST TUE JAN 23 2018  
 
CHALLENGE IN THE SHORT TERM FORECAST WILL BE CLOUD COVERAGE AND  
THE IMPACT ON TEMPERATURES TONIGHT.  
 
LOW CLOUDS HAVE HELD TIGHT ACROSS THE AREA TODAY, AND EXPANSIVE  
CLEARING NOTED ACROSS EASTERN MINNESOTA AND FAR WESTERN WISCONSIN  
SHOWED LITTLE SIGN OF EASTWARD PROGRESSION. THIS IS ALSO EVIDENT  
ON TIME SECTIONS WHICH SHOW PERSISTENT LOW LEVEL MOISTURE OVER THE  
NEXT DAY. AS A RESULT, HAVE INCREASED CLOUD COVER SOME FROM THE  
PREVIOUS FORECAST.  
 
ALSO OF NOTE, SATELLITE IMAGERY SHOWED SOME BREAKS IN THE CLOUDS  
STARTING TO FORM ACROSS CENTRAL WISCONSIN EARLY THIS AFTERNOON.  
GUIDANCE WOULD ALSO SUGGEST THAT SOME HOLES MAY DEVELOP IN THE  
CLOUD DECK LATE THIS AFTERNOON THROUGH EARLY TONIGHT, AND THEN  
FILL BACK IN BY WEDNESDAY MORNING. HAVE ACCOUNTED FOR THIS TREND  
IN THE SKY FORECAST.  
 
DUE THE UNCERTAINLY OF ANY CLEAR PERIODS TONIGHT, CONFIDENCE IN  
MIN TEMPS IS LOW. RAISED TEMPERATURES A FEW DEGREES FROM PREVIOUS  
FORECAST AS SKIES ARE NOT EXPECTED TO BE CLEAR FOR VERY LONG.  
HOWEVER, EVEN A FEW BREAKS COMBINED WITH LIGHT WINDS WILL ALLOW  
TEMPERATURES TO FALL RAPIDLY. CURRENT FORECAST IS FOR LOWS IN THE  
SINGLE DIGITS ACROSS NORTH- CENTRAL AND CENTRAL WISCONSIN, AND IN  
THE LOWER TEENS ACROSS THE FOX VALLEY AND LAKESHORE. THESE WILL  
LIKELY NEED ADJUSTING IF CLOUDS DO NOT PAN OUT AS EXPECTED.  
 
SURFACE HIGH PRESSURE PASSES ACROSS SOUTHERN ONTARIO WEDNESDAY,  
BUT HAS LITTLE INFLUENCE ON THE LOW LEVEL MOISTURE ACROSS  
WISCONSIN. OTHERWISE, FAIRLY QUIET WEATHER AND LIGHT WINDS ARE  
EXPECTED TOMORROW WITH HIGH TEMPS NEAR NORMAL, IN THE LOWER TO  
MIDDLE 20S.  
   
LONG TERM
 
WEDNESDAY NIGHT THROUGH TUESDAY  
ISSUED AT 228 PM CST TUE JAN 23 2018  
 
UPPER RIDGING WILL OCCUR OVER THE LATTER HALF OF THE WORK WEEK,  
WITH DRY WEATHER ANTICIPATED THROUGH THE PERIOD. A WARM FRONT IS  
EXPECTED TO LIFT THROUGH THE REGION THURSDAY NIGHT INTO FRIDAY,  
LEADING TO A BIG WARMUP. EXPECT HIGH TEMPERATURES IN THE LOWER TO  
MIDDLE 40S OVER MOST OF THE AREA ON FRIDAY, BUT A FEW LOCATIONS  
MAY REACH 50 DEGREES FROM WAUPACA AND WAUTOMA EASTWARD INTO THE  
FOX VALLEY, WHERE LITTLE OR NO SNOW COVER EXISTS.  
 
WEAK COLD FRONTAL PASSAGES AND ASSOCIATED UPPER TROUGHS ARE  
EXPECTED TO MOVE THROUGH THE REGION FRIDAY NIGHT, AND SATURDAY  
NIGHT/SUNDAY. MOISTURE WILL BE SPARSE, SO NEITHER SYSTEM IS  
EXPECTED TO PRODUCE MUCH PRECIPITATION. FOR NOW, WILL JUST CARRY  
SMALL POPS IN FAR NORTH CENTRAL WI FOR MINOR LAKE-EFFECT  
POTENTIAL AS WINDS TURN NORTHWEST BEHIND THE FRONTS.  
 
HIGH PRESSURE WILL MOVE ACROSS THE REGION MONDAY AND MONDAY  
NIGHT, FOLLOWED BY SOUTHERLY RETURN FLOW AND WAA NEXT TUESDAY.  
SMALL PRECIPITATION CHANCES MAY BE NEEDED ACROSS NORTHERN WI  
ON TUESDAY, BUT THAT IS A LOW CONFIDENCE DAY 7 FORECAST.  

 
   
AVIATION
 
FOR 06Z TAF ISSUANCE  
ISSUED AT 1006 PM CST TUE JAN 23 2018  
 
CLOUDS HAVE DEPARTED IN AN AREA BOUNDED FROM KAIG TO KSUE TO KGRB  
TO KSTE, WHILE MVFR CLOUDS CONTINUE ELSEWHERE. MVFR CLOUDS MAY  
ERODE A BIT MORE OVERNIGHT AS A HIGH PRESSURE RIDGE DRIFTS OVER.  
BUT A MIX OF CLOUDS WILL BE ON THE INCREASE LATE TONIGHT AND  
WEDNESDAY AS MID LEVEL CLOUDS THEN TRAILING MVFR CLOUDS WITH A  
WEAK SHORT WAVE TROUGH DRIFTS OVER THE AREA.  

 
   
GRB WATCHES/WARNINGS/ADVISORIES
 
 
NONE.  

 
 

 
 
SHORT TERM.....KLB  
LONG TERM......KIECKBUSCH  
AVIATION.......TDH  
 
CLICK HERE TO GO TO PREVIOUS BULLETINS.

The Nexlab WI Page Main Text Page