684  
FXUS63 KLSX 212300  
AFDLSX  
 
AREA FORECAST DISCUSSION...UPDATED AVIATION  
NATIONAL WEATHER SERVICE SAINT LOUIS MO  
600 PM CDT TUE AUG 21 2018  
   
SHORT TERM
 
(THROUGH LATE WEDNESDAY AFTERNOON)  
ISSUED AT 346 PM CDT TUE AUG 21 2018  
 
CYCLONIC FLOW AROUND THE SURFACE LOW NOW OVER THE EASTERN GREAT  
LAKES REGION WILL PUSH EASTWARD THIS AFTERNOON AND EVENING AWAY FROM  
THE REGION. SKIES WILL INITIALLY CLEAR NORTHWEST TO SOUTHEAST  
OVER THE FORECAST AREA. AN AREA OF STATUS WILL MOVE SOUTHEASTWARD  
ALONG AND EAST OF THE MISSISSIPPI RIVER DURING THE OVERNIGHT HOURS  
INTO WEDNESDAY MORNING. HIGH PRESSURE WILL BUILD INTO THE REGION  
OVERNIGHT INTO WEDNESDAY ALLOWING FOR GUSTY NORTH-NORTHWEST WINDS  
TO WEAKEN AFTER SUNSET. TEMPERATURES WILL BE UNSEASONABLY COOL ON  
WEDNESDAY FOR BOTH MORNING LOWS AND AFTERNOON HIGHS.  
 
KELLY  
   
LONG TERM
 
(WEDNESDAY NIGHT THROUGH NEXT TUESDAY)  
ISSUED AT 346 PM CDT TUE AUG 21 2018  
 
HIGH PRESSURE WILL SLIDE EAST INTO SOUTHWEST ILLINOIS BY WEDNESDAY  
NIGHT, THEN TOWARD THE OHIO VALLEY BY THURSDAY MORNING. WINDS WILL  
TURN SOUTHEAST BY THURSDAY MORNING IN RESPONSE TO A COLD FRONT IN  
THE PLAINS MOVING INTO NORTHWEST MISSOURI BY WEDNESDAY NIGHT. THERE  
WILL BE A CHANCE FOR SHOWERS AND THUNDERSTORMS ON THURSDAY IN  
CENTRAL MISSOURI AS LOW-LEVEL WARM ADVECTION STRENGTHENS AHEAD OF AN  
APPROACHING SHORTWAVE TROUGH. LOW-LEVEL MOISTURE WILL ALSO BEGIN TO  
INCREASE OVERNIGHT WEDNESDAY INTO THURSDAY MORNING OVER CENTRAL  
MISSOURI AHEAD OF THE COLD FRONT. HIGH PRESSURE OVER THE EASTERN  
THIRD OF THE COUNTRY KEEP THE COLD FRONT STALLED JUST WEST OF THE  
FORECAST AREA TILL THURSDAY EVENING. THE COLD FRONT WILL THEN MOVE  
INTO CENTRAL MISSOURI BY LATE THURSDAY NIGHT, THEN THE REST OF THE  
AREA BRINGING CHANCES FOR SHOWERS AND THUNDERSTORMS FRIDAY AND  
SATURDAY. HIGH PRESSURE OVER THE SOUTHEAST US WILL KEEP WINDS OUT OF  
THE SOUTH, THEN TO SOUTHWEST BY SATURDAY NIGHT THROUGH MONDAY NIGHT.  
TEMPERATURES OVER THE FORECAST AREA WARM FROM UNSEASONABLY COOL  
VALUES ON THURSDAY AND FRIDAY TO ABOVE NORMAL VALUES ON SUNDAY AND  
MONDAY.  
 
KELLY  
 

 
   
AVIATION
 
(FOR THE 00Z TAFS THROUGH 00Z WEDNESDAY EVENING)  
ISSUED AT 600 PM CDT TUE AUG 21 2018  
 
VFR CONDITIONS, DRY WEATHER, AND NW TO N SURFACE WINDS OF LESS  
THAN 10KTS ARE EXPECTED TO PREVAIL AT THE TAF SITES THRU THE  
VALID PERIOD. A PERIOD OF MID LEVEL CEILINGS ARE EXPECTED TO PASS  
THRU TONIGHT, POSSIBLY ACCOMPANIED BY A BRIEF PERIOD OF LOWER VFR  
CEILINGS, WITH SCATTERING BY SUNRISE WEDNESDAY.  
 
TES  
 

 
   
LSX WATCHES/WARNINGS/ADVISORIES
 
 
MO...NONE.  
IL...NONE.  

 
 

 
 
WFO LSX  
 
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