982  
FXUS63 KILX 111156  
AFDILX  
 
AREA FORECAST DISCUSSION  
NATIONAL WEATHER SERVICE LINCOLN IL  
556 AM CST MON DEC 11 2017  
   
SHORT TERM
 
(TODAY AND TONIGHT)  
ISSUED AT 330 AM CST MON DEC 11 2017  
WEAK RIDGING MOVING THROUGH CENTRAL IL THIS MORNING, RESULTING IN  
SOME VARIABILITY IN THE WINDS, BUT GENERALLY MORE SOUTHERLY FLOW  
AT THE SURFACE. ALOFT HOWEVER, THE NORTHWESTERLY ALOFT CONTINUES,  
AS IT WILL FOR MUCH OF THE FORECAST PERIOD. AS A RESULT, THE  
MAJORITY OF THE SEVEN DAY FORECAST IS A SERIES OF SMALL CLIPPER  
WAVES, WITH MANY OF THEM BRINGING THE BULK OF THE PRECIP THREAT  
TO THE NORTH. CENTRAL IL WILL LIKELY SEE A SERIES OF CHANCES FOR  
FLURRIES AND VARIABLE TEMPERATURES THROUGH THE WEEK.  
 
THE FIRST CHANCE FOR FLURRIES/SPRINKLES WILL COME THIS AFTERNOON  
AND EVENING AS A QUICK WAVE MOVES THROUGH THE REGION. BLUSTERY  
WINDS WILL ACCOMPANY THE WAVE AS WELL. NOT ONLY AN INCREASED  
PRESSURE GRADIENT TO INCREASE THE SUSTAINED WINDS, BUT WINDS ALOFT  
INCREASE AS WELL. BETWEEN SOME MIXING AND JUST ADDING ENOUGH  
TURBULENCE JUST OFF THE SURFACE, GUSTS SHOULD CONTINUE THROUGH THE  
OVERNIGHT. BEHIND THE WAVE, A COLD AIR MASS MOVES INTO THE  
MIDWEST, DROPPING THE TEMPERATURES TONIGHT INTO THE UPPER  
TEENS/LOWER 20S.  
   
LONG TERM
 
(TUESDAY THROUGH SUNDAY)  
ISSUED AT 330 AM CST MON DEC 11 2017  
 
NORTHWESTERLY FLOW CONTINUES AT THE SURFACE AND ALOFT THROUGH THE  
FIRST COUPLE DAYS OF THE WORK WEEK. TUESDAY, THE COLD AIR MASS  
WILL KEEP THE HIGHS IN THE UPPER 20S/NEAR 30. TUESDAY NIGHTS TEMPS  
DROP INTO THE TEENS, WITH THE COLDEST AIR TO THE NORTHEAST AS THE  
PATTERN SHIFTS AGAIN. NEXT CHANCES FOR SNOW NOW SHOWING UP IN THE  
MODEL BLENDS WEDNESDAY, MAINLY TO THE NORTH, AND FLURRIES.  
REMAINDER OF THE FORECAST IS MAINLY DRY, WITH THE POTENTIAL TO SEE  
SOME FLURRIES ADDED IN SUBSEQUENT RUNS AS THE PATTERN SHIFTS FROM  
A NORTHWESTERLY FLOW TO A QUASI ZONAL BY THE END OF THE WEEK. WITH  
THE MODERATING AMPLIFICATION, THE TEMPERATURES MODERATE AS WELL  
THROUGH THE WEEKEND, MILDER ACROSS THE BOARD.  
 

 
   
AVIATION
 
(FOR THE 12Z TAFS THROUGH 12Z TUESDAY MORNING)  
ISSUED AT 537 AM CST MON DEC 11 2017  
VFR THROUGH MOST OF THE DAY AND BLUSTERY. FLURRIES POSSIBLE  
THIS MORNING, SPRINKLES THIS AFTERNOON. NOT ENOUGH OF A  
CONSIDERATION FOR EVEN A VCSH IN MOST PLACES. WINDS MOVING FROM  
SOUTHERLY TO MORE NORTHWESTERLY BY LATER THIS EVENING AS STRATUS  
MOVES IN AND LOWERS TO THE VFR/MVFR BREAK. KEEPING THE LOW CIG IN  
FOR THE OVERNIGHT HOURS AS WAVE IS SLOW TO MOVE OUT OF THE REGION  
AND AT LEAST THE NORTHEAST WILL REMAIN IN SLIGHTLY CYCLONIC FLOW  
ALOFT. GUSTY WINDS EXPECTED THROUGH THE OVERNIGHT HOURS AS WELL.  
 

 
   
ILX WATCHES/WARNINGS/ADVISORIES
 
 
NONE.  

 
 

 
 
SHORT TERM...HJS  
LONG TERM...HJS  
AVIATION...HJS  
 
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