397  
FXUS64 KJAN 201436 AAA  
AFDJAN  
 
AREA FORECAST DISCUSSION...UPDATED  
NATIONAL WEATHER SERVICE JACKSON MS  
836 AM CST MON NOV 20 2017  
   
UPDATE
 
 
UPDATED FOR MORNING DISCUSSION.  
 

 
   
DISCUSSION
 
 
THIS FORECAST UPDATE WAS ONLY TO EXPIRE THE FREEZE WARNING AS  
TEMPERATURES ARE QUICKLY WARMING ABOVE FREEZING AREAWIDE. THE  
REGION CONTINUES TO BE UNDER THE INFLUENCE OF THE STRONG SURFACE  
RIDGING BUILDING OFF TO OUR EAST INTO THE APPALACHIANS. EXPECT  
RETURN FLOW TO SLOWLY MOVE IN & THE WARMING TREND TO CONTINUE,  
WITH A NICE WARM & DRY AFTERNOON IN THE LOWER 60S. WILL MAKE ANOTHER  
UPDATE TO THE FORECAST, IF NEEDED, IN THE NEXT COUPLE HOURS. /DC/  
 
PRIOR DISCUSSION BELOW:  
 
TODAY AND TONIGHT: STRONG SURFACE HIGH PRESSURE RIDGING WILL  
PREVAIL OVER THE AREA TODAY WITH CLEAR SKIES AND HIGHS AROUND 60  
DEGREES. THE SURFACE HIGH WILL CONTINUE TO SHIFT TO THE EAST  
THROUGH THE EVENING INTO THE OVERNIGHT HOURS, WITH THE SURFACE  
FLOW BECOMING MORE SOUTHERLY OVERNIGHT. ANOTHER COLD NIGHT IS ON  
TAP TONIGHT WITH LOWS FALLING BACK INTO THE LOW/MID 30S OVER THE  
AREA. /15/  
 
TUESDAY THROUGH SUNDAY: DRY WEATHER IS EXPECTED THROUGH THE PERIOD.  
TEMPERATURES WILL BE WARMER THAN NORMAL TUESDAY FOLLOWED BY COOLER  
THAN NORMAL TEMPERATURES WEDNESDAY THROUGH FRIDAY MORNING BEFORE  
WARMING ABOVE NORMAL FRIDAY AFTERNOON THROUGH SUNDAY MORNING. SUNDAY  
AFTERNOON THROUGH NEXT MONDAY MORNING WILL BE COOLER THAN NORMAL  
AGAIN.  
 
COME TUESDAY MORNING WL STILL HAVE A DRY AIRMASS IN PLACE WITH PWATS  
BELOW A HALF INCH AND SURFACE DEW POINTS IN THE 30S. A SURFACE RIDGE  
WILL BE NOSING ACROSS OUR CWA FROM THE NORTHEAST BUT THE RESULTING  
LIGHT RETURN FLOW WILL HAVE LITTLE TIME TO MOISTEN OUR AIRMASS  
BEFORE A DEEPENING UPPER LEVEL TROUGH DROPS FROM THE UPPER  
MISSISSIPPI RIVER VALLEY TO ACROSS THE OHIO RIVER VALLEY, SENDING A  
DRY COLD FRONT INTO OUR TUESDAY NIGHT. IN THE WAKE OF THE COLD FRONT  
A >1030MB HIGH WILL DROP OVER THE CENTRAL PLAINS WEDNESDAY.  
NORTHWEST FLOW ALOFT WEDNESDAY WILL CONTINUE OVER OUR REGION THROUGH  
THE WEEKEND. THIS WILL HELP THE SURFACE HIGH SHIFT SOUTHEAST AND  
BECOME CENTERED OVER OUR CWA BY FRIDAY MORNING AS IT WEAKENS. THE  
GULF WILL REMAIN CLOSED AND OUR PWATS WILL CONTINUE BELOW A HALF  
INCH THROUGH SATURDAY MORNING. THE COLDEST NIGHT OF THE PERIOD IS  
EXPECTED THANKSGIVING MORNING WHERE LOWS WILL RANGE FROM THE UPPER  
20S NORTH TO THE MID 30S SOUTHEAST. THE WEAKENED SURFACE HIGH WILL  
SHIFT EAST OF OUR CWA SATURDAY ALLOWING A LIGHT RETURN FLOW AND  
TEMPERATURES TO TOP OUT NEAR 70F. DEEP MOISTURE WILL AGAIN HAVE  
LITTLE TIME TO INCREASE BEFORE ANOTHER DEEPENING UPPER LEVEL TROUGH  
OVER THE EASTERN CONUS HELPS SEND A SECOND DRY COLD FRONT ACROSS OUR  
CWA SATURDAY NIGHT. A RETURN TO COOLER AND DRIER THAN NORMAL  
CONDITIONS IS EXPECTED SUNDAY INTO MONDAY. /22/  
 

 
   
AVIATION
 
 
12Z TAF DISCUSSION:  
VFR CONDITIONS WILL PREVAIL THROUGH THE PERIOD. LIGHT WINDS WILL  
BECOME MORE EASTERLY THAN SOUTHEASTERLY THIS AFTERNOON.  
 

 
   
PRELIMINARY POINT TEMPS/POPS
 
 
JACKSON 61 34 67 42 / 0 0 1 3  
MERIDIAN 60 34 66 41 / 0 0 0 5  
VICKSBURG 62 33 67 42 / 0 0 2 3  
HATTIESBURG 60 37 69 43 / 0 0 2 7  
NATCHEZ 62 36 67 43 / 0 0 4 4  
GREENVILLE 58 36 63 39 / 0 0 0 2  
GREENWOOD 60 34 64 37 / 0 0 0 2  
 

 
   
JAN WATCHES/WARNINGS/ADVISORIES
 
 
MS...NONE.  
LA...NONE.  
AR...NONE.  
 

 
 

 
 
DC  
 
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