157  
FXUS63 KIWX 171711  
AFDIWX  
 
AREA FORECAST DISCUSSION  
NATIONAL WEATHER SERVICE NORTHERN INDIANA  
111 PM EDT TUE SEP 17 2019  
   
SYNOPSIS
 
 
ISSUED AT 112 PM EDT TUE SEP 17 2019  
 
LOW CLOUDS LINGER THIS AFTERNOON ACROSS NORTHEAST INDIANA AND  
SOUTHERN MICHIGAN. HIGH PRESSURE ACROSS THE AREA WILL KEEP WINDS  
FROM THE NORTHEAST. THE COOLER NORTHEAST FLOW WILL KEEP  
TEMPERATURES A LITTLE COOLER TODAY THAN YESTERDAY WITH HIGHS  
AROUND 80. WARM AND DRY CONDITIONS ARE AHEAD THE REST OF THE WEEK  
WITH HIGHS IN THE 80S EACH DAY.  
 

 
   
SHORT TERM
 
(TODAY AND TONIGHT)  
ISSUED AT 419 AM EDT TUE SEP 17 2019  
 
LOW LEVEL POST FRONTAL MOISTURE HAS ALLOWED FOG TO DEVELOP AND  
EXPAND OVER LOWER MICHIGAN INTO NORTHWEST INDIANA EARLY THIS  
MORNING AS A HIGH PRESSURE AREA TO THE NORTH KEEPS A NORTHEAST  
FLOW OVER THE FORECAST AREA. THE FOG WILL MIX OUT THIS MORNING.  
THE COOLER NORTHEAST FLOW SHOULD ALLOW TEMPERATURES TO BE A  
LITTLE COOLER TODAY THAN YESTERDAY WITH HIGHS ONLY AROUND 80.  
 

 
   
LONG TERM
 
(WEDNESDAY THROUGH MONDAY)  
ISSUED AT 419 AM EDT TUE SEP 17 2019  
 
TEMPERATURES WILL REMAIN MUCH ABOVE NORMAL THROUGH SATURDAY  
AS AN UPPER LEVEL RIDGE BUILDS NORTHEAST IN RESPONSE TO AN  
AMPLIFYING TROF OVER WESTERN NORTH AMERICA. TEMPERATURES WILL BE  
10 TO POSSIBLY 15 DEGREES ABOVE NORMAL ESPECIALLY THURSDAY THROUGH  
SATURDAY WITH HIGHS WELL INTO THE 80S AND PERHAPS A FEW 90S.  
DIURNAL TEMPERATURE SPREADS ARE LIKELY TO TOP 25 DEGREES AT TIMES  
AS DRYING ACCENTUATES THE DEVELOPING DROUGHT SITUATION OVER  
SECTIONS OF THE AREA. CHANCES FOR SHOWERS AND STORMS INCREASE THIS  
WEEKEND AS AN UPPER LEVEL SYSTEM EJECTS EAST. THE BEST CHANCES  
FOR RAIN EXTEND FROM SATURDAY NIGHT THROUGH SUNDAY NIGHT AS A  
LARGE UPPER LEVEL SYSTEM EJECTS NORTHEAST OUT OF THE LARGE UPPER  
LEVEL TROF OVER WESTERN NORTH AMERICA.  
 

 
   
AVIATION
 
(FOR THE 18Z TAFS THROUGH 18Z WEDNESDAY MORNING)  
ISSUED AT 112 PM EDT TUE SEP 17 2019  
 
LOW CLOUDS HAVE BEEN SLOW TO ERODE THIS AFTN WITH KSBN VFR... BUT  
KFWA STILL MVFR. EXPECT KFWA TO MIX OUT LATER THIS AFTN BY AROUND  
19-20Z. SURFACE HIGH PRESSURE OVER THE GTLKS REGION TODAY WILL  
SHIFT EAST OVERNIGHT AS THE UPPER LEVEL RIDGE AXIS BECOMES SITU  
OVER THE GTLKS BY WED AFTERNOON. EXPECT VFR CONDS LATER THIS AFTN  
THROUGH THE FCST PERIOD. WINDS WILL REMAIN EASTERLY THROUGH 18Z  
WED.  
 

 
   
IWX WATCHES/WARNINGS/ADVISORIES
 
 
IN...NONE.  
MI...NONE.  
OH...NONE.  
LM...NONE.  

 
 

 
 
SYNOPSIS...MF  
SHORT TERM...SKIPPER  
LONG TERM...SKIPPER  
AVIATION...T  
 
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