240  
FXUS63 KIWX 182245  
AFDIWX  
 
AREA FORECAST DISCUSSION  
NATIONAL WEATHER SERVICE NORTHERN INDIANA  
546 PM EST THU JAN 18 2018  
   
SYNOPSIS
 
 
ISSUED AT 220 PM EST THU JAN 18 2018  
 
WARMER WEATHER EXPECTED INTO THE WEEKEND WITH THE NEXT CHANCE OF  
RAIN AS A SYSTEM MOVES INTO THE AREA SUNDAY NIGHT INTO MONDAY.  
COOLER WEATHER ON THE BACK SIDE OF THE STORM WITH RAIN CHANGING  
TO SNOW ON TUESDAY AND SOME LAKE EFFECT SNOW INTO MID WEEK.  
 

 
   
SHORT TERM
 
(THIS EVENING THROUGH FRIDAY)  
ISSUED AT 220 PM EST THU JAN 18 2018  
 
QUIET WEATHER IN THE SHORT TERM WITH GRADUALLY WARMING TEMPERATURE  
TREND INTO THE WEEKEND. MOISTURE STARVED MID LEVEL WAVE DROPPING  
DOWN FROM WISCONSIN THIS AFTERNOON MAY LEAD TO AN INCREASE IN  
UPPER LEVEL CLOUDS LATE THIS AFTERNOON AND EVENING BUT MAIN ENERGY  
IS WELL UP INTO MICHIGAN. SOUTHWESTERLY WINDS REMAIN MODERATE  
THROUGH THE OVERNIGHT AND DESPITE MOSTLY CLEAR SKIES AND SNOW PACK  
LOW TEMPERATURES WILL REMAIN NEAR 20.  
 

 
   
LONG TERM
 
(FRIDAY NIGHT THROUGH THURSDAY)  
ISSUED AT 220 PM EST THU JAN 18 2018  
 
NOT MUCH CHANGE IN THE PREVIOUS DISCUSSION AS MAIN CONCERN IN THE  
LONG TERM PERIOD IS SYNOPTICALLY FORCED SYSTEM THAT MOVES INTO THE  
REGION SUNDAY NIGHT INTO MONDAY.  
 
SOUTHWESTERLY WARM AIR ADVECTION INTO THE FIRST HALF OF THE  
WEEKEND MODERATES TEMPERATURES INTO THE 40S TO NEAR 50 BY SUNDAY.  
COMBINED WITH WARMER TEMPERATURES AND POSITIVE MOISTURE ADVECTION  
EXPECT SNOW PACK TO GREATLY REDUCE OVER THE NEXT COUPLE DAYS.  
PATCHY FOG POSSIBLE SAT NIGHT DUE TO WARM AIR OVER SNOW PACK BUT  
LEFT IT OUT BECAUSE NOT SURE HOW LONG IT WILL STICK AROUND AS  
CURRENT SNOW PACK WILL DECREASE OVER NEXT FEW DAYS.  
 
AS SYSTEM DEPARTS TO OUR NORTH BACK SIDE WRAPAROUND MOISTURE WITH  
SOME LAKE ENHANCEMENT POSSIBLE ON TUESDAY. TEMPERATURES BEGIN TO  
COOL WITH A MORE NORTHWESTERLY FLOW CHANGING THE PRECIP TYPE TO  
SNOW BY TUESDAY. A FEW CHANCES OF LAKE EFFECT SNOW POSSIBLE NEXT  
WEEK WITH ANOTHER GRADUAL WARMUP BY THE END OF THE FORECAST  
PERIOD.  
 

 
   
AVIATION
 
(FOR THE 00Z TAFS THROUGH 00Z FRIDAY EVENING)  
ISSUED AT 546 PM EST THU JAN 18 2018  
 
VFR THIS PERIOD AS WX NIL CONTINUES INBETWEEN STAUNCH SFC RIDGE  
DRAPED ACROSS THE GULF COAST AND DEVELOPING LEE SIDE TROUGH IN  
RESPONSE TO POTENT SW TROUGH COMING ONSHORE ACROSS SRN CA FRI  
EVENING. BRISK SW FLOW WILL CONTINUE ALONG WITH LLWS THROUGH 06Z  
BEFORE DIMINISHING.  
 

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

 
 

 
 
SYNOPSIS...HEIDELBERGER  
SHORT TERM...HEIDELBERGER  
LONG TERM...HEIDELBERGER  
AVIATION...T  
 
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