168  
FXUS63 KAPX 221826  
AFDAPX  
 
AREA FORECAST DISCUSSION  
NATIONAL WEATHER SERVICE GAYLORD MI  
226 PM EDT FRI SEP 22 2017  
   
NEAR TERM
 
(TONIGHT THROUGH SATURDAY)  
ISSUED AT 225 PM EDT FRI SEP 22 2017  
   
..HOT FOR THE FIRST DAY OF FALL
 
 
HIGH IMPACT WEATHER POTENTIAL...THUNDERSTORMS NORTH THIS AFTERNOON  
AND MORE RECORD TEMPS FOR SATURDAY.  
 
PRIMARY FORECAST CONCERNS...DECAYING AREA OF CONVECTION OVER N  
WISCONSIN AND W U.P. WILL MAKE A RUN AT THE REGION THIS EVENING.  
CONVECTION WILL LOSE STEAM AS IT MOVES AWAY FROM STRONG LLJ IN THE  
UPPER MIDWEST. WEAK SURFACE TROUGH ACROSS THE U.P. CONTINUES TO  
POOL HIGHER DEWPOINTS AND PROVIDE WEAK CONVERGENCE. SO THIS  
BOUNDARY COULD SERVE TO HOLD SOME OF THE PRECIPITATION TOGETHER  
THROUGH THE EVENING.  
 
UPPER RIDGE AND SURFACE HIGH REMAIN IN PLACE THROUGH THE WEEKEND.  
DEWPOINTS IN THE 60S TO NEAR 70 WITH TEMPERATURES NEAR 25F ABOVE  
NORMAL SUNDAY. MORE RECORDS WILL FALL. NOTHING MORE THAN ISOLATED  
PRECIPITATION EXPECTED SATURDAY. ATMOSPHERE IS CAPPED, SO  
ALTHOUGH CAPE VALUES WILL ONCE AGAIN BE 1500+ J/KG, WILL TAKE SOME  
A STRONG TRIGGER TO GET ANYTHING TO DEVELOP.  
 
RECORDS FOR SATURDAY:  
 
RECORD (YEAR)  
GLR 83 (2004)  
TVC 90 (1937)  
APN 89 (1937)  
ANJ 84 (1936)  
 

 
   
SHORT TERM
 
(SATURDAY NIGHT THROUGH MONDAY)  
ISSUED AT 225 PM EDT FRI SEP 22 2017  
   
..MORE RECORD HIGH TEMPERATURES LIKELY TO FALL
 
 
NO HUGE CHANGES TO THE FORECAST WITH THE RECORD OR NEAR RECORD HEAT  
CONTINUING. ONE SUBTLE CHANGE IS THAT THE CENTER OF THE LARGE 500 MB  
GRADUALLY DRIFTS OFF TO THE EAST. THE MAIN IMPLICATION TO THIS IS  
THAT IT WILL NOT BE QUITE AS HOT (NOT THAT YOU WILL NOTICE THE  
DIFFERENCE REALLY) WITH 850 MB TEMPERATURES OF A DEGREE OR TWO LESS  
EACH DAY BUT STILL EXPECT HIGHS OF WELL INTO THE 80S TO NEAR 90.  
THIS WILL LIKELY ESTABLISH NEW RECORD HIGHS FOR BOTH SUNDAY AND  
MONDAY IN AT LEAST A COUPLE OF LOCATIONS. THERE IS LITTLE CHANCE FOR  
RAIN THROUGH THIS TIME THOUGH AS HEIGHTS REMAIN ON THE UNSEASONABLY  
HIGH SIDE...MID AND UPPER LEVEL MOISTURE IS SPARSE AND THE SURFACE  
PRESSURE GRADIENT PICKS UP SOME INHIBITING LAKE BREEZES FROM  
FORMING.  
 

 
   
LONG TERM
 
(MONDAY NIGHT THROUGH FRIDAY)  
ISSUED AT 225 PM EDT FRI SEP 22 2017  
 
AN APPROACHING COLD FRONT ASSOCIATED WITH A WEAK AREA OF LOW  
PRESSURE OVER THE UPPER GREAT LAKES WILL BRING INCREASED  
CLOUDINESS THROUGHOUT THE DAY TUESDAY WITH RENEWED CHANCES OF RAIN  
TUESDAY NIGHT THROUGH WEDNESDAY. AFTER FRONTAL PASSAGE...THE  
ABOVE NORMAL TEMPERATURES OF THE PAST SEVERAL DAYS WILL BE GONE,  
WITH HIGHS ONLY IN THE UPPER 60S TO LOW 70S WEDNESDAY.  
NORTHWESTERLY WINDS WILL CONTINUE TO FILTER IN COOLER TEMPERATURES  
WITH HIGHS ONLY IN THE UPPER 50S TO LOW 60S THURSDAY AND FRIDAY.  
THE PATTERN BECOMES MORE UNSETTLED WITH A DEEP LONGWAVE TROUGH  
OVER THE EASTERN CONUS, BRINGING NUISANCE SHOWERS TO THE FORECAST  
AREA THROUGHOUT THE REST OF THE EXTENDED PERIOD.  
 

 
   
AVIATION
 
(FOR THE 18Z TAFS THROUGH 18Z SATURDAY AFTERNOON)  
ISSUED AT 120 PM EDT FRI SEP 22 2017  
 
VFR CONDITIONS EXPECTED THROUGH SATURDAY. LIGHT WINDS AND CLEAR  
SKIES ARE EXPECTED OVER MOST OF THE REGION THROUGH THE WEEKEND. A  
FEW SHOWERS OR THUNDERSTORMS ARE POSSIBLE ACROSS THE U.P. THIS  
AFTERNOON AND EVENING.  
 

 
   
MARINE
 
 
ISSUED AT 225 PM EDT FRI SEP 22 2017  
 
WINDS AND WAVES WILL REMAIN BELOW SCA CRITERIA EARLY NEXT WEEK AS  
HIGH PRESSURE HOLDS OVERHEAD. A FEW SHOWERS OR POSSIBLY A  
THUNDERSTORM COULD DEVELOP ACROSS THE UP THIS AFTERNOON BUT MAINLY  
DRY WX AND UNSEASONABLY WARM TEMPS ARE EXPECTED ACROSS OUR ENTIRE  
REGION.  
 

 
   
APX WATCHES/WARNINGS/ADVISORIES
 
 
MI...NONE.  
LH...NONE.  
LM...NONE.  
LS...NONE.  

 
 

 
 
NEAR TERM...KF  
SHORT TERM...AS  
LONG TERM...TL  
AVIATION...KF  
MARINE...KF  
 
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